密封充氧条件下密度对曼氏无针乌贼幼体的影响

Effects of different densities on Sepiella maindroni larvae under sealed oxygenation condition

选择体重为1.62±0.69 g、胴长为1.95±0.33 cm的曼氏无针乌贼幼体为研究对象,使用有效容积20 L的尼龙袋做为试验容器,设置3种载水量(5 L、8 L和10 L)和5种装载数量(25只、50只、75只、100只和125只),分析比较在密封充氧条件下,不同载水量和密度对曼氏无针乌贼幼体安全时长的影响。结果表明,在载水量不变的情况下,曼氏无针乌贼幼体安全时长与密度呈线性显著相关。载水量为5 L时,安全时长与密度线性关系为H′=-0.302 8D+9.882,R^2=0.8829;载水量为8L时,安全时长与密度线性关系为H′=-0.546 6D+11.074,R^2=0.932 6;载水量为10 L时,安全时长与密度线性关系为H′=-0.622 4D+8.268,R^2=0.917 1。使用有效容积为20 L的尼龙袋作为充氧密封运法的容器时,运输时长超过8h,宜选择载水量为5L,密度小于6.21 ind·L^(-1);运输时长在4h^8h之间,宜选择载水量为5L,密度小于19.43 ind·L^(-1);运输时长低于4h,宜选择载水量为8L,密度小于16.60 ind·L^(-1)。

The aim of this experiment is to illustrate the effects of different densities on Sepiella maindroni larvae [ weight （ 1.62 ± 0.69） g , mantle length （ 1.95 ± 0.33 cm） ]. Nylon bags （ effective volume 20 L） with 5 L, 8 L and 10 L water were selected, and 5 quantities of 25 ind, 50 ind, 75 ind, 100 ind and 125 ind larvae were put in each bag. Results showed that in different amounts of water, there was a significant linear correlation between safety time and density of Sepiella maindroni larvae. As the water volume was 5L, the safety time presented to be H＇ = -0. 302 8D ＋ 9. 882（R2 =0.882 9） ; as the water 8 L, the safety time H＇ = - 0. 546 6D ＋ 11. 074 （ R2 = 0. 932 6） ; as the water 10 L, the safety time H＇= 0. 622 4D ＋ 8. 268 （ R2 =- 0. 917 1）. It is found that using the nylon bag （effective volume 20 L） as the carrier under sealed oxygenation condition, when the transport time was longer than 8 h, 5 L carrier water should be chosen with the density less than 6.21 ind ·L-1; when the transport time was between 4 h -8 h, 5 L water should be chosen,with the density less than 19.43 ind · L-1 ; when the time was shorterer than 4 h, 8 L water should be chosen,with the density less than 16.60 ind · L-1.