To examine the effect of stocking and management models on growth and yield of freshwater pearl mussel,Hyriopsis cumingii,an enclosure experiment was carried out in the Science and Technology Service Center for Freshwater Pearl Industry of Zhejiang Province at Fengqiao,Zhuji,from July 28 to October 28,2004.Three types of stocking including monoculture of the pearl mussel,polyculture of the pearl mussel and gibel carp(Carassius auratus gibelio), and polyculture of the pearl mussel,silver carp(Hypophthalmichthys molitrix) and bighead carp(Aristichthys nobilis) were established.For each type of stocking,two types of management including fertilizing and the combined use of fertilizer and formulated diet were used.At the start and end of the enclosure experiment,shell length,shell width,total weight of the pearl mussel,and body weight of the fish were measured.Yield of the pearl mussel and fish was calculated based on survival and growth of the pearl mussel and fish.Results of the experiment show that growth and yield of the 1 year-old and 2 year-old pearl mussel are closely dependent on the stocking model used,while the management model examined does not affect growth and yield of the pearl mussel significantly.By using polyculture,yield of both the pearl mussel and fish can be multiplied.Further comparison shows polyculture with gibel carp results in relatively good growth of 1 year-old mussel,and polyculture with silver carp and bighead carp is helpful to enhance growth of 2 year-old mussel.