Effects of temperature, sediment and food on hatching and growth of juvenile and young Hemifusus tuba

Effects of different temperature, sediment and food on hatching and growth of Hemifusus tuba were studied using single-factor test. The results were as follows: the average number of juvenile individuals attained 15.07 indoocyst-1, significantly more than that of 23℃(13.3 indoocyst-1) and 26℃(12.87 indoocyst-1). The incubation time was 30 d at 29℃,40 d at 26℃ and 35 d at 23℃. The survival rate reached 66.7% at 23℃ and 36.37% at 29℃. The shell height of juvenile individuals was 6.330.34 mm at 26℃, significantly higher than that of 23℃ and 29℃. After cultivation, there was no significant difference between 23℃ (17.592.22 mm) and 26℃ (16.661.80 mm), so 23℃ was considered to be the suitable incubation temperature. The cultivation condition without sediment was better than that with sediment for newly-hatched juvenile individuals. However, the cultivation condition with sediment was better than that without sediment for young ones; living food was better than formula food.