密度对养成期方斑东风螺摄食和生长的影响

The Influence of Different Density on the Growth and Feeding of Babylonia aerolata

在水温保持约28℃条件下,方斑东风螺日均摄食率、日均体重增长率,随其生长逐渐下降,而日均体重生长量逐渐上升。在密度300～1500个/m^2范围内、小换水量（30%/d）试验条件下,当体重为1～2g、壳高15～20mm时,不同密度组方斑东风螺生长无明显差异,适宜的密度在1500个/m^2以内;当体重3～4g、壳高25mm左右时,密度1500个/m^2,方斑东风螺生长速度明显低于其他组,认为适宜的密度为900个/m^2左右;当体重4～5g、壳高25～30mm时,适宜密度应为600～900个/m^2。

Under the constant temperature at 28℃, the daily feeding and the daily growth in body weight of B. aerolata, gradually drops with its individual growth, while the daffy growth rate in body weight gradually rises. Under the test conditions of that the density is 300 ～ 1500个/m^2, the water exchange is 30%/day, when the body weight ofB. aerolata is 1 ～2g, shell length is 15 ～20mm, the growth of it is not obvious difference under the different density, the appropriate density is within 1,500/m^2; When its body weight is 3 ～ 4g, shell length is about 25mm, the growth speed is lower than other groups obviously under the density of 1,500/m^2. It is thought the appropriate density is about 900/m^2 ; When its body weight is 4 ～5g, shell length is 25 ～ 30mm, the appropriate density should be 600 ～ 900/m^2.