The influence of different environmental factors on the growth and survival rate of juvenile of bamboo clam Solen grandis

This paper reports the growth and survival rates of juvenile of bamboo clam Solen grandis reared in different kinds of sediments,rearing densities and food concentrations.Results showed that(1)sediments affected both the growth and survival rates of juvenile.The group with fine sand had the highest growth rate,while the group with fine silt had the lowest.The survival rates ordered by the group with fine sand(64.25%) the group with coarse sand(62.79%) the group with fine silt(60.41%).(2)With the increasing of rearing density,the growth and survival rates of juvenile of S.grandis decreased.(3)With the increasing of food concentration,the growth rate of juvenile increased,while the survival rate rose at first,then dropped.The survival rate of the group with 20×l04 ind/mL food concentration was the highest.It is obvious that the diameter of sediment particle ranging from 0.25 mm to 0.063 mm was the best sediment media.It is suggested that the juvenile of S.grandis with shell length ranging from 5 mm to 10 mm,the rearing density be kept about 1×l04 ind/m2 and the food concentration be kept about 20×l04 ind/mL.