Research on the Diets Determination for Initial Feeding of Anguilla mormorata Glass Eel

[ Objective] To find a suital;）le food for initial feeding of Anguilla mormorata glass eels. [ Method] A pre -weaning feeding experiment was conducted indoor in fiberglass tanks, three different diets, Tubifex, minced octopus flesh and 1：1 mixture （ by weight ） of Tubffex and minced octo- pus flesh were introduced, r Result] All three kinds of diets were acceptable to A. morrnorata glass eels, and of three diets, the minced octopus flesh could serve as the best food for initial feeding of A. mormorata glass eels, which contributed 93% survival at the termination of the 21 - day＇s exped- ment and provided with relatively fast growth and homogeneous size variation. [ Conclusion] The minced octopus flesh can serve as a suitable food to replace Tubifex for the initial feeding of anguilla glass eels.

三唑磷对5种鳗鲡幼鳗的急性毒性实验

以5种鳗鲡的幼鳗为实验对象[日本鳗鲡(Anguilla japonica)、欧洲鳗鲡(A.anguilla)、印尼鳗鲡(A.bicolor Pacifica)、菲律宾鳗鲡(A.mormorata)和美洲鳗鲡(A.rostrata)],选择常见的环境污染物有机磷农药三唑磷开展了急性毒性研究。5种鳗鲡对三唑磷的毒性反应类似,但致死浓度区间有差异。三唑磷的的毒性大小顺序为欧洲鳗鲡>菲律宾鳗鲡>日本鳗鲡>美洲鳗鲡>印尼鳗鲡,其安全浓度分别为1.22×10-4、4.12×10-4、6.16×10-4、2.24×10-3、7.53×10-3mg.L-1,美洲鳗鲡和印尼鳗鲡对三唑磷的耐受能力显著强于其他3种鳗鲡。5种鳗鲡对三唑磷均表现出显著的时间效应和计量效应,呈显著正相关。三唑磷对于5种幼鳗的毒性评价均为剧毒。

工厂化循环水培育菲律宾鳗鲡苗种试验

采用分级微生物净化、曝气增氧、有效控温等循环水养殖系统对菲律宾鳗鲡进行苗种培育试验。鳗苗放养密度为3 000尾/m2和3 050尾/m2,约为传统模式的5～6倍。试验结果显示:在水温27～30℃范围内,对个体体重0.15～0.20 g(平均0.17 g)的菲律宾鳗鲡苗进行培育,经过71 d培育,个体平均体重为2.95 g,增重17.7倍,日均增加重量0.04 g,鳗苗养殖成活率达到98.81%,高于传统养殖模式,水蚯蚓饲料系数7.14。试验表明,工厂化循环水养殖系统适用于菲律宾鳗苗培育,并具有节能减排优点,为开发新的鳗鲡养殖品种及环境友好型的鳗鲡育苗模式提供参考。