The optimal larval stocking density of blood clam Scapharca subcrenata in a pond nursery
GE Li-jun, YANG Yu-xiang, ZHAO Wen, YAN Xi-wu, ZHANG Huan , ZHANG Shu-hong
1. Key Laboratory of Hydrobiology in Liaoning Province's University, Dalian Fisheries Univ. , Dalian 116023, China; 2. Bureau of Jinzhou Ocean and Fisheries, Jinzhou 121002, China
Abstract: Blood clam (Scapharca subcrenata) juveniles with shell length varying from 1.35 -4.00 mm were stocking into plastic nets with different mesh sizes at a density of 2 × 10^4 ,4 000 and 2 000 individuals per net to evaluate the optimal larval density during the blood clam nursery in a pond. It was found that the blood clam juveniles had mean survival rate of 81.2% ,75.5% and 92.3% ,shell length of 1.89 ±0.02, 4.38 ±0.07 and 5.80 ± 0.10 mm, and daily shell length growth of 26.8 ±0.8, 126.3± 3.7 and 60.0 ± 3.0 μm at the optimal stocking density 2 × 10^4 ,4 000 and 2 000 ind./net in three types of truck net in the nursery, respectively.