Most cited articles
1 Development status of world cephalopod fisheries and suggestions for squid jigging fishery in China
2019, 28(3):321-330.
DOI: 10.12024/jsou.20181102445
Abstract:
The cephalopods are one of the most potential fishing species in the world and have become an important component of the world's marine fishing industry. The world cephalopod fisheries and their composition were analysed using the grey association method based on the world cephalopod production statistics from 1970 to 2016. According to the development status of China's pelagic squid fishery, the problems are pointed out and the development countermeasures are put forward. The analysis found that the world's cephalopod fishing production in the period from 1970 to 2016 generally showed a relatively stable growth trend, with an annual growth rate of 3.68%, which is much higher than the growth rate of world marine fishing production in the same period, and reached its highest level ever in 2014. Between 2010 and 2016, the proportion of cephalopods in world fishing production stabilized between 4.5% and 6.0%. The composition and proportion of the production for different families have varied from one generation to another, and the production of main countries and areas has changed greatly. In the 2010s, the proportion of each family was Ommastrephidae (58.41%), Loliginidae (11.98%), Octopodidae (8.92%), and Sepiidae (8.40%). Asia has played the important role in the cephalopod fishery in the world for more than 40 years. Japanese cephalopod production fell from 1st in the 1970s to 5th in the 1990s and 2010s, and China rose from 5th in the 1970s to 1st in the 2000s and 2010s. The lack of knowing, developing and controlling abilities over pelagic squid resources is a major constraint on the sustainable development of pelagic squid fisheries in China. Therefore, a global information service system should be developed on the fishing conditions of pelagic squid fisheries, a system for the standardization of fishing gear and equipment with independent property rights, the catch quality control technologies and traceability systems should be developed, information-based construction of ocean-going fisheries should be carried out based on Internet of Things projects, and the cephalopod fishery resources assessment system should be established.
The cephalopods are one of the most potential fishing species in the world and have become an important component of the world's marine fishing industry. The world cephalopod fisheries and their composition were analysed using the grey association method based on the world cephalopod production statistics from 1970 to 2016. According to the development status of China's pelagic squid fishery, the problems are pointed out and the development countermeasures are put forward. The analysis found that the world's cephalopod fishing production in the period from 1970 to 2016 generally showed a relatively stable growth trend, with an annual growth rate of 3.68%, which is much higher than the growth rate of world marine fishing production in the same period, and reached its highest level ever in 2014. Between 2010 and 2016, the proportion of cephalopods in world fishing production stabilized between 4.5% and 6.0%. The composition and proportion of the production for different families have varied from one generation to another, and the production of main countries and areas has changed greatly. In the 2010s, the proportion of each family was Ommastrephidae (58.41%), Loliginidae (11.98%), Octopodidae (8.92%), and Sepiidae (8.40%). Asia has played the important role in the cephalopod fishery in the world for more than 40 years. Japanese cephalopod production fell from 1st in the 1970s to 5th in the 1990s and 2010s, and China rose from 5th in the 1970s to 1st in the 2000s and 2010s. The lack of knowing, developing and controlling abilities over pelagic squid resources is a major constraint on the sustainable development of pelagic squid fisheries in China. Therefore, a global information service system should be developed on the fishing conditions of pelagic squid fisheries, a system for the standardization of fishing gear and equipment with independent property rights, the catch quality control technologies and traceability systems should be developed, information-based construction of ocean-going fisheries should be carried out based on Internet of Things projects, and the cephalopod fishery resources assessment system should be established.
2011, 20(2):260-269.
Abstract:
Habitat suitability index (HSI) has been widely used in fishery resources exploitation, management, assessment and protection since it was found in the early 1980s, and it has become one of the most important tools in fishery science research. In this article, outlining the studies in the world, the theory and methods of HSI, and the advance applications and exist problems have been summarized. Some advice should be considered sufficiently in the application of HSI, i.e., (1) study on target species’ life history and biological characteristics and its habitats; (2) suitable environment factors should be selected according to different growth stages; (3) research on spatialtempral scales of data and rule set on data; (4) selecting logical weights upon different factors based on literature and expert knowledge; (5) selecting preparatory HSI models be propitious to the various goals, such as protection area, fishing ground and biomass evaluation; (6) selecting suitable HSI models by comparison of models and related analysis; (7) modifying models using insitu or recent data in order to improve precision of model.
Habitat suitability index (HSI) has been widely used in fishery resources exploitation, management, assessment and protection since it was found in the early 1980s, and it has become one of the most important tools in fishery science research. In this article, outlining the studies in the world, the theory and methods of HSI, and the advance applications and exist problems have been summarized. Some advice should be considered sufficiently in the application of HSI, i.e., (1) study on target species’ life history and biological characteristics and its habitats; (2) suitable environment factors should be selected according to different growth stages; (3) research on spatialtempral scales of data and rule set on data; (4) selecting logical weights upon different factors based on literature and expert knowledge; (5) selecting preparatory HSI models be propitious to the various goals, such as protection area, fishing ground and biomass evaluation; (6) selecting suitable HSI models by comparison of models and related analysis; (7) modifying models using insitu or recent data in order to improve precision of model.
CAO Jie
,
CHEN Xin-jun
,
,
LIU Bi-lin
,
TIAN Si-quan
,
QIAN Wei-guo
,
(.College of Marine Sciences
,
Shanghai Ocean University
,
Shanghai
,
China
,
.Key Laboratory of Shanghai Education Commission for Oceanic Fisheries Resources Exploitation
,
.Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources
,
Ministry of Education
,
China)
2010(2).
Abstract:
Over the past decades,with the decline of economic finfish stocks around the world,the short-life cycle squid has become one of important fishing targets and its total catches keep on increasing.Becasue the short-life cycle squid is sensitive responding to environmental changes with great abundence fluctuations,which sometimes reduces the recruitment to the stocks,the assessment and management do not work well based on traditional population dynamic models.In this paper,we review the development of methods ...
Over the past decades,with the decline of economic finfish stocks around the world,the short-life cycle squid has become one of important fishing targets and its total catches keep on increasing.Becasue the short-life cycle squid is sensitive responding to environmental changes with great abundence fluctuations,which sometimes reduces the recruitment to the stocks,the assessment and management do not work well based on traditional population dynamic models.In this paper,we review the development of methods ...
2012, 21(5):831-840.
Abstract:
The oceanic Ommastrephidae is an important cephalopod resource. The main species which have been exploited at the large scale commercial development included 〖WTBX〗Todarodes pacificus, Illex argentinus, Dosidicus gigas, Nototodarus sloani and Symplectoteuthis oualaniensis. According to the data statistics during 1992 to 2010, the Ommastrephidae production accounted for 51.15%-62.19% of cephalopods in the world, with an average of 55.40%. In this paper, the current exploitation and resources conditions of Todarodes pacificus, Illex argentinus, Dosidicus gigas and other squids are described in details. Meanwhile, according to the biological characteristics of short life cycle and fast growth, four major scientific issues which are to be resolved have been put forward. The four scientific issues are: (1) a completely comprehensive understanding of the ecological status and role of Ommastrephidae; (2) fully mastering the effect of environment including global climate change on the recruitment of Ommastrephidae; (3) further study of assessment model for Ommastrephidae based on the short life cycle; and (4) developing the ecosystem based resource management approaches for Ommastrephidae.
The oceanic Ommastrephidae is an important cephalopod resource. The main species which have been exploited at the large scale commercial development included 〖WTBX〗Todarodes pacificus, Illex argentinus, Dosidicus gigas, Nototodarus sloani and Symplectoteuthis oualaniensis. According to the data statistics during 1992 to 2010, the Ommastrephidae production accounted for 51.15%-62.19% of cephalopods in the world, with an average of 55.40%. In this paper, the current exploitation and resources conditions of Todarodes pacificus, Illex argentinus, Dosidicus gigas and other squids are described in details. Meanwhile, according to the biological characteristics of short life cycle and fast growth, four major scientific issues which are to be resolved have been put forward. The four scientific issues are: (1) a completely comprehensive understanding of the ecological status and role of Ommastrephidae; (2) fully mastering the effect of environment including global climate change on the recruitment of Ommastrephidae; (3) further study of assessment model for Ommastrephidae based on the short life cycle; and (4) developing the ecosystem based resource management approaches for Ommastrephidae.
2012, 21(3):431-438.
Abstract:
Illex argentinus is an important target species for Chinese squid jigging fleets in the southwest Atlantic,and the accurate forecasting of fishing ground can provide better scientific guidance for fishing activities. In this study, according to the Chinese squid fishing production data during the main fishing season (January to May) from 2000 to 2005, combined with sea surface temperature (SST) and chl.a accordingly, the percentage of fishing times and daily catch (CPUE) will be considered as the suitability index (SI). Using arithmetic mean model (AM) to establish the integrated habitat suitability index (HSI) based on SST and chl.a from 2000 to 2004, and the fishing and environmental data were used to test the established HSI model from January to May in 2005. The results indicated that AM model is fitted well. According to the data from January to May in 2005, we found that the main fishing ground is distributed in the waters with HSI more than 0.6 from the AM HSI model, and its percentage of fishing times reached more than 76 percent and its average CPUE were above 7.6 t/d. The results showed that the AM HSI model based on SST and chl.a can better predict the fishing grounds of squid in the southwest Atlantic and the accuracy rate of forecasting fishing ground reaches more than 70%.
Illex argentinus is an important target species for Chinese squid jigging fleets in the southwest Atlantic,and the accurate forecasting of fishing ground can provide better scientific guidance for fishing activities. In this study, according to the Chinese squid fishing production data during the main fishing season (January to May) from 2000 to 2005, combined with sea surface temperature (SST) and chl.a accordingly, the percentage of fishing times and daily catch (CPUE) will be considered as the suitability index (SI). Using arithmetic mean model (AM) to establish the integrated habitat suitability index (HSI) based on SST and chl.a from 2000 to 2004, and the fishing and environmental data were used to test the established HSI model from January to May in 2005. The results indicated that AM model is fitted well. According to the data from January to May in 2005, we found that the main fishing ground is distributed in the waters with HSI more than 0.6 from the AM HSI model, and its percentage of fishing times reached more than 76 percent and its average CPUE were above 7.6 t/d. The results showed that the AM HSI model based on SST and chl.a can better predict the fishing grounds of squid in the southwest Atlantic and the accuracy rate of forecasting fishing ground reaches more than 70%.
2014, 23(5):669-674.
Abstract:
Coilia nasus is a kind of mid-small-sized fish with resident and migration ecotypes.The anadromous population has long been recognized as very important commercial aquatic products in the lower reaches of the Yangtze River.To evaluate the fishery biological characteristics, we analyzed 458 specimens of Coilia nasus collected at Jingjiang section of the Yangtze River in fishing season, in May, 2012.The results showed that the spawning stock included 1-4 years old groups with 85.81% of age 2 to 3 years.The body length ranged from 14.2 to 38.9 cm with an average of (25.72±4.08)cm and the body weight varied from 9.2 to 208.4 g with an average of (69.59±33.73)g.Body length and body weight were fitted into the function W=0.0028L3.0866(R2=0.915 3), The average fatness was only 0.38±0.08.Based on the von Bertalanffy growth equation:Lt=40.82[1-e-0.31(t+0.55)],Wt=262.59[1-e-0.31(t+0.55)]3，we calculated the asymptotic length of 40.82 cm and the asymptotic weight of 262.59 g.The age at inflection point of body weight growth curve was 2.99 years old when body weight was Wt=77.66 g.Compared with the study results in 1970s, the recruitment and young surplus populations of the spawning stock increased significantly in reproductive population.Low-age and miniaturization tendency was obviously accompanied with fatness decrease.However, the growth potential was still high on the basis of the growth equation.The results suggest that active measures such as reducing fishing intensity of the reproductive population and protecting the spawning grounds are imperative to maintain this precious fishery resources.
Coilia nasus is a kind of mid-small-sized fish with resident and migration ecotypes.The anadromous population has long been recognized as very important commercial aquatic products in the lower reaches of the Yangtze River.To evaluate the fishery biological characteristics, we analyzed 458 specimens of Coilia nasus collected at Jingjiang section of the Yangtze River in fishing season, in May, 2012.The results showed that the spawning stock included 1-4 years old groups with 85.81% of age 2 to 3 years.The body length ranged from 14.2 to 38.9 cm with an average of (25.72±4.08)cm and the body weight varied from 9.2 to 208.4 g with an average of (69.59±33.73)g.Body length and body weight were fitted into the function W=0.0028L3.0866(R2=0.915 3), The average fatness was only 0.38±0.08.Based on the von Bertalanffy growth equation:Lt=40.82[1-e-0.31(t+0.55)],Wt=262.59[1-e-0.31(t+0.55)]3，we calculated the asymptotic length of 40.82 cm and the asymptotic weight of 262.59 g.The age at inflection point of body weight growth curve was 2.99 years old when body weight was Wt=77.66 g.Compared with the study results in 1970s, the recruitment and young surplus populations of the spawning stock increased significantly in reproductive population.Low-age and miniaturization tendency was obviously accompanied with fatness decrease.However, the growth potential was still high on the basis of the growth equation.The results suggest that active measures such as reducing fishing intensity of the reproductive population and protecting the spawning grounds are imperative to maintain this precious fishery resources.
2018, 27(4):573-583.
DOI: 10.12024/jsou.20171102171
Abstract:
Ommastrephes bartramii is a commercially important cephalopod in the northwest Pacific Ocean, and as ecological opportunist, the spatial distribution of its stock is determined by marine environment. Using the relationship between the spatio-temporal variation of the migratory path and the oceanic environment to predict the spatial distribution of the squid resources is the research emphasis of fishery resources. It has great significance to practical production. According to the fishing production data from Chinese fishing fleet, combined with sea surface temperature (SST), sea surface salinity (SSS), chlorophyll-a concentration (chl-a) and Trans-Niño index (TNI) in the northwest Pacific Ocean during August to November in 2004 to 2015, We used hierarchical cluster analysis and neural network to analyze the relationship between the spatio-temporal variation of the migratory path and the oceanic environment to predict the change of the migratory path of the squid under the influence of the oceanic environment.The results showed that the proportion of production of the migratory gravity of the squid is significantly negatively correlated with the dispersion degree in October and November. There is a significant positive correlation between the change of the migratory gravity in the latitude and the TNI, which does not appear in the longitude.The model of predicting the spatio-temporal variation of the migratory path of the squid was established by using the neural network combined with sea surface temperature, salinity and chlorophyll concentration. The results of forecasting showed that during August to November, the migration gravity of squid shows the change trend of south-north-south in the latitude, and the change trend of west-east-west in the longitude.In August and September, the estimated proportion of production of the migratory gravity area was 64% and 68% respectively. In October and November, the prediction accuracy rate has obviously improved, and the estimated proportion of production of the migratory gravity area was 83% and 89% respectively.
Ommastrephes bartramii is a commercially important cephalopod in the northwest Pacific Ocean, and as ecological opportunist, the spatial distribution of its stock is determined by marine environment. Using the relationship between the spatio-temporal variation of the migratory path and the oceanic environment to predict the spatial distribution of the squid resources is the research emphasis of fishery resources. It has great significance to practical production. According to the fishing production data from Chinese fishing fleet, combined with sea surface temperature (SST), sea surface salinity (SSS), chlorophyll-a concentration (chl-a) and Trans-Niño index (TNI) in the northwest Pacific Ocean during August to November in 2004 to 2015, We used hierarchical cluster analysis and neural network to analyze the relationship between the spatio-temporal variation of the migratory path and the oceanic environment to predict the change of the migratory path of the squid under the influence of the oceanic environment.The results showed that the proportion of production of the migratory gravity of the squid is significantly negatively correlated with the dispersion degree in October and November. There is a significant positive correlation between the change of the migratory gravity in the latitude and the TNI, which does not appear in the longitude.The model of predicting the spatio-temporal variation of the migratory path of the squid was established by using the neural network combined with sea surface temperature, salinity and chlorophyll concentration. The results of forecasting showed that during August to November, the migration gravity of squid shows the change trend of south-north-south in the latitude, and the change trend of west-east-west in the longitude.In August and September, the estimated proportion of production of the migratory gravity area was 64% and 68% respectively. In October and November, the prediction accuracy rate has obviously improved, and the estimated proportion of production of the migratory gravity area was 83% and 89% respectively.
2019, 28(3):344-356.
DOI: 10.12024/jsou.20181202467
Abstract:
Oceanic squid is an important marine living resource and has great potential for exploitation. Chinese oceanic squid fishery began in 1989. After nearly 30 years of development, Chinese oceanic squid fishery has become an important component of distant-water fishery and has become the largest in the world. In the course of development in the past 30 years, through the cooperation of fisheries industry, education and research units, the oceanic squid resources have been continuously investigated by using fishing vessles in the three oceans, and some new squid resources have been continuously developed and utilized commercialy. Therefore, based on the data collected by Chinese squid fishing vessel from 2003 to 2017, the paper analyzes the basic biology, resource distribution of squid and its relationship with water temperature, and summarizes the development of squid jigging fishery in China. The countermeasures and suggestions for sustainable development of oceanic squid resources in the world are put forward. The study indicated that through a productive survey of seven oceanic squid resources in the three oceans, including the Indian Ocean, the Pacific Ocean and the Atlantic Ocean, four new squid fishing grounds have been discovered for the first time in the world, and more than 10 million square kilometers of new fishing areas have been added. It is estimated that the resources of the new oceanic squid are more than 5 million tons. However, due to the limited time available for investigation and the limited knowledge of the newly developed squid life history process, it is recommended that a systematic and scientific international cooperative survey, including age and growth, population structure and life history processes, and migratory distribution based on hard tissue of oceanic squid should be carried out. The research on high-precision fisheries forecasting, and assessment and management strategy of oceanic squid resources should be also developed, which will help to realize rational exploitation and utilization of oceanic squid resources in the world.
Oceanic squid is an important marine living resource and has great potential for exploitation. Chinese oceanic squid fishery began in 1989. After nearly 30 years of development, Chinese oceanic squid fishery has become an important component of distant-water fishery and has become the largest in the world. In the course of development in the past 30 years, through the cooperation of fisheries industry, education and research units, the oceanic squid resources have been continuously investigated by using fishing vessles in the three oceans, and some new squid resources have been continuously developed and utilized commercialy. Therefore, based on the data collected by Chinese squid fishing vessel from 2003 to 2017, the paper analyzes the basic biology, resource distribution of squid and its relationship with water temperature, and summarizes the development of squid jigging fishery in China. The countermeasures and suggestions for sustainable development of oceanic squid resources in the world are put forward. The study indicated that through a productive survey of seven oceanic squid resources in the three oceans, including the Indian Ocean, the Pacific Ocean and the Atlantic Ocean, four new squid fishing grounds have been discovered for the first time in the world, and more than 10 million square kilometers of new fishing areas have been added. It is estimated that the resources of the new oceanic squid are more than 5 million tons. However, due to the limited time available for investigation and the limited knowledge of the newly developed squid life history process, it is recommended that a systematic and scientific international cooperative survey, including age and growth, population structure and life history processes, and migratory distribution based on hard tissue of oceanic squid should be carried out. The research on high-precision fisheries forecasting, and assessment and management strategy of oceanic squid resources should be also developed, which will help to realize rational exploitation and utilization of oceanic squid resources in the world.
ZHAO Jing
,
ZHANG Shou-yu
,
XU Min(Marine Ecosystem & Environmental Laboratory
,
College of Marine Sciences
,
Shanghai Ocean University
,
Shanghai
,
China)
2010(1).
Abstract:
The kelp bed is a typical offshore ecosystem,with especial ecosystem structure and abundance aquicolous resources,which made it have a complex energy structure and obvious character.By using Ecopath with Ecosim(EWE) software,a mass-balanced ecopath model of the kelp bed ecosystem in Gouqi was constructed.Through the analysis of the trophic level,energy flowing,and the ecosystem characters etc.also combining the function of kelp bed,the state of the kelp bed was estimated,and the causes were discussed here.T...
The kelp bed is a typical offshore ecosystem,with especial ecosystem structure and abundance aquicolous resources,which made it have a complex energy structure and obvious character.By using Ecopath with Ecosim(EWE) software,a mass-balanced ecopath model of the kelp bed ecosystem in Gouqi was constructed.Through the analysis of the trophic level,energy flowing,and the ecosystem characters etc.also combining the function of kelp bed,the state of the kelp bed was estimated,and the causes were discussed here.T...
2012, 21(5):841-847.
Abstract:
Retrospective problem (RR) was defined as systematic biases in successive estimations of fishery parameters (typically stock biomass and fishing mortality) with additional years of data added in stock assessment. RP arising in many fishery stock assessments can potentially result in large uncertainty in fish stock biomass estimates, which will lead to over exploit or under exploit fish populations. RP is one of hot and hard topics in fishery stock assessment at present. The MOHN ρ was used mainly as the metric of RP and the cause of RP was reduced to errors in data or in assumption of models or both. At present, there were diverse methods for diagnoses of RP, but these methods were generally valid only in some specific case. The researchers working on fisheries stock assessment provided some methods to fix or avoid RP according to their specific study, but there was still a lack of general methods or means to correct or avoid RP. If RP occurred in a stock assessment, there must be some errors in data or assumption of the model. Therefore, Retrospective analysis was effective means to assess the quality of the data and check the consistency of assumption between data and the model.
Retrospective problem (RR) was defined as systematic biases in successive estimations of fishery parameters (typically stock biomass and fishing mortality) with additional years of data added in stock assessment. RP arising in many fishery stock assessments can potentially result in large uncertainty in fish stock biomass estimates, which will lead to over exploit or under exploit fish populations. RP is one of hot and hard topics in fishery stock assessment at present. The MOHN ρ was used mainly as the metric of RP and the cause of RP was reduced to errors in data or in assumption of models or both. At present, there were diverse methods for diagnoses of RP, but these methods were generally valid only in some specific case. The researchers working on fisheries stock assessment provided some methods to fix or avoid RP according to their specific study, but there was still a lack of general methods or means to correct or avoid RP. If RP occurred in a stock assessment, there must be some errors in data or assumption of the model. Therefore, Retrospective analysis was effective means to assess the quality of the data and check the consistency of assumption between data and the model.
2017, 26(3):450-457.
DOI: 10.12024/jsou.20160501781
Abstract:
Squid is one of the important economic species in the northwestern Pacific. Using Catch per Unit Effort and V% as the target of central fishing ground and adopting BP artificial neural network, we forecast fishing ground in the northwest Pacific Ocean. The study was based on the data of squid fishing and relevant marine environment factors, including longitude, latitude, SST and SSHA from July to November from 1995 to 2001.The input factor is marine environment factor, the output factors are CPUE and V% and 4-3-1 and 4-2-1 model total 4 kinds models were used to compare which is the best suitable model for fishery forecast. The minimum fitting residual of model is the best one. Result shows that 4-3-1 is the best suitable model for each month, but the best suitable model for July and August is 4-3-1 with output V% and best suitable model for September, October and November is 4-3-1 with output CPUE, the minimum overall average error is 4-3-1 model output V%. Research suggests that there are differences as a center of fishery forecast targets by CPUE and V%, and the 4-3-1 model output V% can be used as forecasting model of squid fishing ground.
Squid is one of the important economic species in the northwestern Pacific. Using Catch per Unit Effort and V% as the target of central fishing ground and adopting BP artificial neural network, we forecast fishing ground in the northwest Pacific Ocean. The study was based on the data of squid fishing and relevant marine environment factors, including longitude, latitude, SST and SSHA from July to November from 1995 to 2001.The input factor is marine environment factor, the output factors are CPUE and V% and 4-3-1 and 4-2-1 model total 4 kinds models were used to compare which is the best suitable model for fishery forecast. The minimum fitting residual of model is the best one. Result shows that 4-3-1 is the best suitable model for each month, but the best suitable model for July and August is 4-3-1 with output V% and best suitable model for September, October and November is 4-3-1 with output CPUE, the minimum overall average error is 4-3-1 model output V%. Research suggests that there are differences as a center of fishery forecast targets by CPUE and V%, and the 4-3-1 model output V% can be used as forecasting model of squid fishing ground.
CHENG Fang
,
LING Qu-fei
,
XU Hai-jun
,
LIN Jian-hua
,
WU Lin-kun
,
JIA Wen-fang (.School of Life Sciences
,
Soochow University
,
Suzhou
,
China
,
.Taihu Lake Fisheries Administration Committee of Jiangsu Province
,
Suzhou
,
China)
2010(1).
Abstract:
The analysis samples of water chemistry and aquatic biology were collected quarterly in Taihu Lake from November 2007 to August 2008.We evaluate the actual condition of water quality and the main pollution sources of Taihu Lake by ways of water pollution index and comprehensive analysis of eutrophication.Evaluation of water pollution index analysis revealed that the main pollutants in Taihu Lake were nitrogen(N),phosphorus(P) and organic oxygen consumption(COD Mn).Total phosphorus(TP) shared the largest pol...
The analysis samples of water chemistry and aquatic biology were collected quarterly in Taihu Lake from November 2007 to August 2008.We evaluate the actual condition of water quality and the main pollution sources of Taihu Lake by ways of water pollution index and comprehensive analysis of eutrophication.Evaluation of water pollution index analysis revealed that the main pollutants in Taihu Lake were nitrogen(N),phosphorus(P) and organic oxygen consumption(COD Mn).Total phosphorus(TP) shared the largest pol...
2011, 20(1):102-107.
Abstract:
Based on the catch and fishing effort data from small scale traditional light seining fisheries of Zhejiang Province and abundance data estimated by Fisheries Agency of Japan, the influence of the sea surface temperature (SST) from East China Sea and sea surface temperature anomaly (SSTA) from Niňo 3.4 area on the stock size of chub mackerel in East China Sea was analyzed. The results showed that there were significant positive relation (P<0.05) between SST and CPUE derived from small scale traditional light seining fisheries of Zhejiang Province and significant negative relation (P<0.05) between SST and abundance from Japan. The averaged SSTA of Niňo 3.4 from January to March can be considered as an index which roughly reflected abundance levels. When the averaged SSTA was negative, there was a great chance in lean year for chub mackerel stock, and vice versa. The opposite relationships between SST and abundance from different areas may be attributed to the influence of SST on migration of chub mackerel. La Niňa event would have a negative impact on the resource in the whole East China Sea, but the reason needs to be investigated in the future. The results indicated that the temporal and spatial dynamics of the stock should be included in the stock assessment for chub mackerel.
Based on the catch and fishing effort data from small scale traditional light seining fisheries of Zhejiang Province and abundance data estimated by Fisheries Agency of Japan, the influence of the sea surface temperature (SST) from East China Sea and sea surface temperature anomaly (SSTA) from Niňo 3.4 area on the stock size of chub mackerel in East China Sea was analyzed. The results showed that there were significant positive relation (P<0.05) between SST and CPUE derived from small scale traditional light seining fisheries of Zhejiang Province and significant negative relation (P<0.05) between SST and abundance from Japan. The averaged SSTA of Niňo 3.4 from January to March can be considered as an index which roughly reflected abundance levels. When the averaged SSTA was negative, there was a great chance in lean year for chub mackerel stock, and vice versa. The opposite relationships between SST and abundance from different areas may be attributed to the influence of SST on migration of chub mackerel. La Niňa event would have a negative impact on the resource in the whole East China Sea, but the reason needs to be investigated in the future. The results indicated that the temporal and spatial dynamics of the stock should be included in the stock assessment for chub mackerel.
2011, 20(1):108-113.
Abstract:
Sea water temperature (SST) is one of the important factors that impact growth, reproduction and recruitment of chub mackerel. According to the catch and standardized CPUE data of purse seine fishery with lights (PSFL) and monthly sea surface temperature of the spawning ground in February from 1998 to 2006, the author developed a surplus production model for chub mackerel based on SST, and analyzed the impact of SST on the chub mackerel stock and its sustainable yield. The result indicates the relationship between sustainable yield and SST, can be expressed as Yt=1 080.97 ft-0.006f2t+114.51SSTt ft-2.91SST2tft. Variations of chub mackerel stock biomass and sustainable yield are controlled mainly by SST in the spawning ground and fishing effort. The optimal SST range for chub mackerel spawning is 18.5- 20.6℃. It is suggested that the maximum sustainable yield may be estimated based on the annual different environmental conditions, and the fishery management measures should be adjusted in realtime.
Sea water temperature (SST) is one of the important factors that impact growth, reproduction and recruitment of chub mackerel. According to the catch and standardized CPUE data of purse seine fishery with lights (PSFL) and monthly sea surface temperature of the spawning ground in February from 1998 to 2006, the author developed a surplus production model for chub mackerel based on SST, and analyzed the impact of SST on the chub mackerel stock and its sustainable yield. The result indicates the relationship between sustainable yield and SST, can be expressed as Yt=1 080.97 ft-0.006f2t+114.51SSTt ft-2.91SST2tft. Variations of chub mackerel stock biomass and sustainable yield are controlled mainly by SST in the spawning ground and fishing effort. The optimal SST range for chub mackerel spawning is 18.5- 20.6℃. It is suggested that the maximum sustainable yield may be estimated based on the annual different environmental conditions, and the fishery management measures should be adjusted in realtime.
2012, 21(6):955-964.
Abstract:
From May to September in 2010, water quality parameters such as water temperature, total dissolved salt, dissolved oxygen, pH, transparency, nitrite nitrogen, ammonia nitrogen, nitrate nitrogen, total nitrogen, reactive phosphorus, total phosphorus, chlorophyll a and biochemical oxygen demand were analyzed in 22 Litopenaeus vannamei ponds with different culturing methods in Fengxian District, Shanghai. Water used for Farm No.1 was natural fresh water which had been precipitated before being introduced to the ponds. Mixed salt were added to the fresh water for culturing shrimp in Farm No.2. Results were as follows: water temperature, dissolved oxygen and pH didn’t change dramatically and could match the demand of Litopenaeus vannamei. The proportion of nitrate nitrogen in ponds to TIN was the highest, the ratio of ammonia nitrogen to TIN increased with time extension, and that of nitrite nitrogen to TIN increased obviously in the later period of culture cycle. Contents of reactive phosphorus decreased gradually while the total phosphorus increased in the whole process of culture. Biochemical oxygen demand and chlorophyll a also increased gradually with the shrimp growing up. Muscle nutritional quality of Litopenaeus vannamei from the two farms were analyzed and the results were as follows: contents of crude protein and crude fat of shrimp muscle in Farm No.1 were 16.30% and 1.42% respectively, lower than those in shrimp muscle from Farm No.2 which were 18.30% and 1.61%. Content of total amino acids in shrimp from Farm No.1was 23.27%, and the essential amino acid was 9.09%. While those in shrimp from Farm No.2 were 27.52% and 10.74%. Contents of flavor amino acids in shrimp from Farms No.1 and 2 were 8.52% and 10.16% respectively.
From May to September in 2010, water quality parameters such as water temperature, total dissolved salt, dissolved oxygen, pH, transparency, nitrite nitrogen, ammonia nitrogen, nitrate nitrogen, total nitrogen, reactive phosphorus, total phosphorus, chlorophyll a and biochemical oxygen demand were analyzed in 22 Litopenaeus vannamei ponds with different culturing methods in Fengxian District, Shanghai. Water used for Farm No.1 was natural fresh water which had been precipitated before being introduced to the ponds. Mixed salt were added to the fresh water for culturing shrimp in Farm No.2. Results were as follows: water temperature, dissolved oxygen and pH didn’t change dramatically and could match the demand of Litopenaeus vannamei. The proportion of nitrate nitrogen in ponds to TIN was the highest, the ratio of ammonia nitrogen to TIN increased with time extension, and that of nitrite nitrogen to TIN increased obviously in the later period of culture cycle. Contents of reactive phosphorus decreased gradually while the total phosphorus increased in the whole process of culture. Biochemical oxygen demand and chlorophyll a also increased gradually with the shrimp growing up. Muscle nutritional quality of Litopenaeus vannamei from the two farms were analyzed and the results were as follows: contents of crude protein and crude fat of shrimp muscle in Farm No.1 were 16.30% and 1.42% respectively, lower than those in shrimp muscle from Farm No.2 which were 18.30% and 1.61%. Content of total amino acids in shrimp from Farm No.1was 23.27%, and the essential amino acid was 9.09%. While those in shrimp from Farm No.2 were 27.52% and 10.74%. Contents of flavor amino acids in shrimp from Farms No.1 and 2 were 8.52% and 10.16% respectively.
16 Review on the early life history of neon flying squid Ommastrephes bartramii in the North Pacific
2013, 22(5):755-762.
Abstract:
Ommastrephes bartramii is a kind of short life cycle species which has the characteristics of dying immediately after spawning, and the stock size entirely depends on the recruitment, while the recruitment mainly depends on its mortality in the early life stage.Ommastrephes bartramii is an important economic cephalopod, and is widely distribute in the North Pacific Ocean, therefore understanding the progress of the early life history of Ommastrephes bartramii thoroughly can play an important role in predicting the changes of recruitment in the next year. For this purpose, this paper mainly reviews and discusses the distribution of paralarvae and juveniles of Ommastrephes bartramii, feeding, age and growth, natural mortality, and also the correlation between the environment and recruitment. This paper also gives a brief introduction to the progress of embryonic development and morphological changes of larvae. The early life history which is from spawning to hatching and embryonic development to grow to be larvae is a very important and least understood stage. Future research should focus on this stage by studying the growth and death of the larvae and the influence of environment changes on the squid hatching success, as well as the stock recruitment.
Ommastrephes bartramii is a kind of short life cycle species which has the characteristics of dying immediately after spawning, and the stock size entirely depends on the recruitment, while the recruitment mainly depends on its mortality in the early life stage.Ommastrephes bartramii is an important economic cephalopod, and is widely distribute in the North Pacific Ocean, therefore understanding the progress of the early life history of Ommastrephes bartramii thoroughly can play an important role in predicting the changes of recruitment in the next year. For this purpose, this paper mainly reviews and discusses the distribution of paralarvae and juveniles of Ommastrephes bartramii, feeding, age and growth, natural mortality, and also the correlation between the environment and recruitment. This paper also gives a brief introduction to the progress of embryonic development and morphological changes of larvae. The early life history which is from spawning to hatching and embryonic development to grow to be larvae is a very important and least understood stage. Future research should focus on this stage by studying the growth and death of the larvae and the influence of environment changes on the squid hatching success, as well as the stock recruitment.
2013, 22(5).
Abstract:
The oceanic squid is a kind of short life cycle species which has the characteristics of being dead immediately after spawning, and the stock size entirely depends on the recruitment, while the recruitment mainly depends on the mortality of the oceanic squid in the early life stages. Ommastrephes bartramii is an important economic cephalopod, and widely distribute in the North Pacific Ocean, therefore understanding the progress of the early life history of Ommastrephes bartramii thoroughly can play an important role on predicting the changes of recruitment in the next year. For this purpose, this paper mainly reviews and discusses the distribution of paralarval and juvenile of Ommastrephes bartramii, feeding, age and growth, natural mortality, also the correlation between the environment and recruitment. This passage also gives a brief introduction of the progress of embryonic development and morphological changes of larvae. The early life history which is from spawning to hatching and embryonic development to grow to be larvae is a very important and least understood stage. Future research should focus on this stage by studying the growth and death of the larvae and the influents of environment changes on the squid hatching success, as well as the stock recruitment.
The oceanic squid is a kind of short life cycle species which has the characteristics of being dead immediately after spawning, and the stock size entirely depends on the recruitment, while the recruitment mainly depends on the mortality of the oceanic squid in the early life stages. Ommastrephes bartramii is an important economic cephalopod, and widely distribute in the North Pacific Ocean, therefore understanding the progress of the early life history of Ommastrephes bartramii thoroughly can play an important role on predicting the changes of recruitment in the next year. For this purpose, this paper mainly reviews and discusses the distribution of paralarval and juvenile of Ommastrephes bartramii, feeding, age and growth, natural mortality, also the correlation between the environment and recruitment. This passage also gives a brief introduction of the progress of embryonic development and morphological changes of larvae. The early life history which is from spawning to hatching and embryonic development to grow to be larvae is a very important and least understood stage. Future research should focus on this stage by studying the growth and death of the larvae and the influents of environment changes on the squid hatching success, as well as the stock recruitment.
2018, 27(4):531-542.
DOI: 10.12024/jsou.20171002156
Abstract:
In order to study the effect of composite vertical subsurface flow constructed wetlands on the removal of heavy metals in pond aquaculture water, the correlation between different plant roots and their substrates near roots on heavy metal enrichment effect, different environmental factors and heavy metal enrichment rate were analyzed by measuring water quality index and heavy metal. The results showed that the removal efficiencies of Pb and Cu in constructed wetlands were 77.20% and 41.70%, respectively. Compared with other types of wetlands, the composite vertical subsurface flow constructed wetlands had some advantages for the removal of Pb and Cu; the As was released in wetland with an average release rate of 8.40%. The roots of Polygonum hydropiper and Thalia dealbata Fraser have enrichment effect on Cr, As, Pb and Cu, and the roots of Pontederia cordata L. have only enrichment of Cr and As. The substrates near the roots of Polygonum hydropiper, Pontederia cordata L., and Thalia dealbata Fraser have a good enrichment effect on chromium, and among them, the maximum rate of the concentration of Pontederia cordata L. to chromium is 0.987mg/(kg·d). The enrichment rate of Pb and Cu in Polygonum hydropiper root was negatively correlated with temperature and the enrichment rate of Cr and Cu was negatively correlated with pH; the enrichment rate of Cr and As in Pontederia cordata L. root was negatively correlated with temperature; the enrichment rate of Pb in Thalia dealbata Fraser root was negatively correlated with temperature and pH, the enrichment rate of Cu was negatively correlated with temperature. The results of this study provide a theoretical basis and reference for the application of composite vertical subsurface flow constructed wetlands and the selection of wetland plants from the perspective of heavy metal removal.
In order to study the effect of composite vertical subsurface flow constructed wetlands on the removal of heavy metals in pond aquaculture water, the correlation between different plant roots and their substrates near roots on heavy metal enrichment effect, different environmental factors and heavy metal enrichment rate were analyzed by measuring water quality index and heavy metal. The results showed that the removal efficiencies of Pb and Cu in constructed wetlands were 77.20% and 41.70%, respectively. Compared with other types of wetlands, the composite vertical subsurface flow constructed wetlands had some advantages for the removal of Pb and Cu; the As was released in wetland with an average release rate of 8.40%. The roots of Polygonum hydropiper and Thalia dealbata Fraser have enrichment effect on Cr, As, Pb and Cu, and the roots of Pontederia cordata L. have only enrichment of Cr and As. The substrates near the roots of Polygonum hydropiper, Pontederia cordata L., and Thalia dealbata Fraser have a good enrichment effect on chromium, and among them, the maximum rate of the concentration of Pontederia cordata L. to chromium is 0.987mg/(kg·d). The enrichment rate of Pb and Cu in Polygonum hydropiper root was negatively correlated with temperature and the enrichment rate of Cr and Cu was negatively correlated with pH; the enrichment rate of Cr and As in Pontederia cordata L. root was negatively correlated with temperature; the enrichment rate of Pb in Thalia dealbata Fraser root was negatively correlated with temperature and pH, the enrichment rate of Cu was negatively correlated with temperature. The results of this study provide a theoretical basis and reference for the application of composite vertical subsurface flow constructed wetlands and the selection of wetland plants from the perspective of heavy metal removal.
TIAN Si-quan
,
,
CHEN Xin-jun
,
(.College of Marine Sciences
,
Shanghai Ocean University
,
Shanghai
,
China
,
.Key Laboratory of Shanghai Education Commission for Oceanic Fisheries Resources Exploitation
,
.Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources
,
Ministry of Education
,
China)
2010(2).
Abstract:
CPUE standardization is a role in fisheries stock assessment.Different calculating methods for nominal CPUE can affect standardized CPUE which usually is used to index fisheries abundance.In CPUE standardization modeling,nominal CPUE is as a response variable which usually can be calculated in three methods:(1) for every record,CPUE is calculated by catch dividing the corresponding effort,and the all CPUEs were input the model;(2) all fisheries data records are first grouped by one spatial scale(fishing gri...
CPUE standardization is a role in fisheries stock assessment.Different calculating methods for nominal CPUE can affect standardized CPUE which usually is used to index fisheries abundance.In CPUE standardization modeling,nominal CPUE is as a response variable which usually can be calculated in three methods:(1) for every record,CPUE is calculated by catch dividing the corresponding effort,and the all CPUEs were input the model;(2) all fisheries data records are first grouped by one spatial scale(fishing gri...
FAN Jiang-tao
,
CHEN Xin-jun
,
,
CAO Jie
,
TIAN Si-quan
,
QIAN Wei-guo
,
LIU Bi-lin
,
(.College of Marine Sciences
,
Shanghai Ocean University
,
Shanghai
,
China
,
. Key Laboratory of Oceanic Fisheries Resources Exploitation of Shanghai Education Commission
,
. Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources
,
Ministry of Education
,
China)
2010(3).
Abstract:
柔鱼是北太平洋海域的重要经济头足类,黑潮的变化直接影响着柔鱼渔场形成及其空间分布。利用1998-2007年黑潮分布类型,结合同期8-10月我国鱿钓渔船生产数据,分析北太平洋柔鱼渔场变化与黑潮分布的关系。在25°～40°N、125°～150°E海域内,以空间分布率经纬度5°×5°为一个空间单元,共分A(140°～145°E、35°～40°N)、B(145°～150°E、35°～40°N)、C(135°～140°E、30°～35°N)、D(140°～145°E、30°～35°N)和E(145°～150°E、30°～35°N)5个区,将黑潮分布类型分为大弯曲型、小弯曲型和平直型3种。利用渔场重心的纬度向变化作为柔鱼渔场变动的指标。研究认为,A区黑潮分布特征对柔鱼渔场重心纬度影响最大,其次为B区和C区,而其它区影响则不明显。A区出现黑潮大弯曲型时,柔鱼渔场重心明显偏北且概率高;小弯曲型或平直型时,柔鱼渔场重心明显偏南。研究认为,黑潮流轴的走向影响着柔鱼渔场的空间分布。
柔鱼是北太平洋海域的重要经济头足类,黑潮的变化直接影响着柔鱼渔场形成及其空间分布。利用1998-2007年黑潮分布类型,结合同期8-10月我国鱿钓渔船生产数据,分析北太平洋柔鱼渔场变化与黑潮分布的关系。在25°～40°N、125°～150°E海域内,以空间分布率经纬度5°×5°为一个空间单元,共分A(140°～145°E、35°～40°N)、B(145°～150°E、35°～40°N)、C(135°～140°E、30°～35°N)、D(140°～145°E、30°～35°N)和E(145°～150°E、30°～35°N)5个区,将黑潮分布类型分为大弯曲型、小弯曲型和平直型3种。利用渔场重心的纬度向变化作为柔鱼渔场变动的指标。研究认为,A区黑潮分布特征对柔鱼渔场重心纬度影响最大,其次为B区和C区,而其它区影响则不明显。A区出现黑潮大弯曲型时,柔鱼渔场重心明显偏北且概率高;小弯曲型或平直型时,柔鱼渔场重心明显偏南。研究认为,黑潮流轴的走向影响着柔鱼渔场的空间分布。
