Abstract:In the present paper a new species of Caridina is described. The speci-mens were collected from Hubei in 1989. Caridina hubeiensis sp. nov. Rostrum reaches beyond extremity of second segment of antennalar peduncle, itsdorsal border bears 14-20 teeth, 2-4 of which are situated on the carapace behind orbit;its ventral border bears 2-4 teeth. The posterior margin of the telson is rounded and ends a short median tooth. Thereare 3 pairs intermediate spines, which are shorter than the lateral spines. Carpus of the 1st leg is 1.4-1.5 times as long as wide, and the chela is 1.8-2.0times as long as wide. Carpus of the 2nd leg is 4.9-5.0 times as long as wide, and thechela is 2.4-2.5 times as long as wide. Endopod of the 1st male pleopod is leaf-shaped. The appendix interna is bend,and folds at the extremity portion of the endopod. Comparison The present new species closely allied to Caridina baojingensis, butdiffers from the latter in the following feature: 1. The rostrum is longer and bearsteeth in the dorsal and ventral borders. 2. The telson bears 3 pairs intermediatespines. 3. The chelae of the 1st and 2nd legs are shorter and coarser. 4. Carpus of the1st and 2nd legs is shorter.

Abstract:本文采用软X射线照影技术，研究中国对虾(Penaeus chinensis)在不同时间．水温以及其个体大小的情况下，对钡剂饲料消化排空的规律。结果表明，对钡剂饲料的消化排空时间(y)，随着体长(x)的增长而延长：y=2．634 0．413x(r=0．81，n=29)；随着水温(x)上升或下降，食物排空时间(y)减少或增加：y=148．41x^-0.05(r=0．70，n=38)；体长l与其胃中食物X光映像面积(s)之间呈幂指数函数关系．s=0．07968l^2.6233(r=0．77，n=18)。这些规律为探索中国对虾一次摄食量和日摄食节律，正确制定成虾养殖中合理投饲量和投饲次数提供了一定的科学依据。

Abstract:本文研究了鲢在各种冻藏条件下鱼体肌肉组织结构及其蛋白质冷冻变性后制成鱼糜制品的弹性品质变化．结果表明。鲢在低温下冷冻，肌肉纤维内的水发生内冻结，冰晶体小，较好地保持其组织结构的完整性．考虑到冻鱼在冻藏过程中肌肉组织的继续变化，为保持冻鱼的质量，一般鲢在-8℃冻藏时不应超过15d．在-24℃和-30℃冻藏时可保持30d和45d．从其鱼糜制品弹性品质的结果表明。-80℃比-24℃和-30℃冻藏的鱼肉随冻藏时间的增加其凝胶强度(JS)和抗张应力(TS)值呈明显下降趋势，折曲质地等级也由AA级降至B，C级。

Abstract:The straight slot geneva mechanism (SSGM) is a popular indexingdevice. It converts a uniform rotary motion to intermittent rotary motion. The mainadventage of the mechanism lies in its simplicity. However, the output motion starts andends with non-zero angular acceleration which usually induces shock loading andcan produce vibration in the driven system and impose several constraints on high-speed motion. The improved straight slot geneva mechanism (ISSGM) studied in this paperovercomes the main shortcomings of SSGM. Furthermore, its design and manufactu-ring are not very difficult in practice by comparing with SSGM. ISSGM is practicallyworth to the design and improvement for food processing machinery with high effi-ciency.

Abstract:In this paper a gas mixing device and an instrument for measuringthe permeability of gases in plastic film for modified atmospheric packaging foods wereengineered. The component gases were charged into the mixing device at a given ratioby controlling the partial pressures of two or three component gases. The device wasincorporated with a conventional vacuum packaging machine used for the modifiedatmospheric packaging. The gas permeability instrument was used to measure thepermeability of individual gas in plastic film so as to properly select packaging mate-rial to be used. In this experiment jelly fish was packaged in three different kinds of plastic filmpouches into which various proportions of CO_2/N_2 gas mixture were admitted. Thenthe pouches were sealed and stored under different temperatures in order to attain theoptimum factors influencing the keeping quality of the item. The results show that alonger shelf life of jelly fish packages in plastic film pouch of low permeability and inthe modified atmosphere even stored at ordinary temperature was obtained in case theinitial bacteria counts in the raw material was low and the proportion of CO_2/N_2 gasmixture was properly selected.

Abstract:鳗鲡卵黄蛋白制备物与血清在SDS-聚丙烯酰胺凝胶电泳上分别呈现出2条相对应的蛋白区带,迁移率(R_f)相同。对照组雌鳗经5次和7次注射HCG与CPG后,成熟系数(GSI)分别为(11.94±2.83)%和(46.04±6.22)%,血清中17β-雌二醇(17β-E_2)浓度为(0.665±0.431)ng/ml和(0.421±0.010)ng/ml,睾酮(T)为(4.603±3.442)ng/ml和(3.817±1.399)ng/ml,经HCG.CPG与鳗鲡卵黄蛋白三者混合注射5次和7次后,GSI分别为(16.53±6.67)%和(53.23±11.25)%,血清中17β-E_2浓度为(1.036±0.316)ng/ml和(0.411±0.068)ng/ml,T为(11.170±5.818)ng/ml和(3.956±1.780)ng/ml。未经注射催情药物的雌鳗GSI为(0.50±0.32)%,血清中17β-E_2和T浓度低,检测不出。试验结果证明,外源性鳗鲡卵黄蛋白与HCG和CPG三者混合注射具有明显的促进鳗鲡卵巢加速发育成熟的作用。

Abstract:本文采用以食品风味、色泽、口感为主的感官和化学检定方法对欧式鱼排、鱼圆和口乐开3种淡水鱼冷冻制品，在不同保藏温度下的质量变化和保藏期限进行了测定。结果表明，这类含有鱼肉、淀粉、蔬菜等多种原料和化学组成的产品，在5℃和O℃冷藏温度下的质量变化主要是产品风味、色泽、口感等原有品质的迅速下降和馊败、腐败所导致的变质，分别在3～6d和9～14d内成为不可接受的产品。在-10℃和-18℃冻藏温度下，馊败或腐败被抑制，主要质量变化是产品原有风味、色泽、口感的下降．保持原有风味，色泽、口感不变的保质期限，在-100℃为3～5个月，在-18℃为6个月以上。从而为这类淡水鱼深加工产品在生产、贮运和消费过程中掌握和控制好产品保质的时间、温度条件提供了具有现实参考意义的结果。