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降海鳗鲡一直是作为研究鳗鲡人工繁殖的材料,由于降海鳗鲡的资源衰退,选用池塘养殖鳗鲡作为亲本的研究成为热点。尽管人工诱导野生降海鳗鲡获得的胚胎发育过程的研究已报道,但人工诱导池塘养殖鳗鲡的胚胎及仔鱼早期发育未见报道。本文应用池塘养殖日本鳗鲡取代野生降海日本鳗鲡进行人工繁殖,2002年的孵化批次共80次,其中大部分为人工授精卵(60次),一部分(20次)为自然产卵。受精率为(44.03±21.99)%,孵化率为(65.76±19.48)%,共计获得苗种349.9万尾。连续记录了鳗鲡的胚胎和早期仔鱼的发育过程。在水温为20.5℃时,胚胎发育需要时间为49h,所需积温1005℃.h;在水温为22.5℃时,胚胎发育需要时间为39h,所需积温878℃.h;在水温为24.5℃时,胚胎发育需要时间为34h,所需积温833℃.h。
Sea anguilla eel has been used as a material for artificial breeding of eel. Due to the decline of the resources of sea urchin, the selection of pond culture anguilla as a parent has become a hot topic. Although studies on the embryonic development obtained by artificially inducing wild drop eels have been reported, the early development of embryos and larvae in artificially induced pond cultured eels has not been reported. In this paper, Japanese eel (Anguilla japonicus) was cultured in ponds instead of wild Japanese eel for artificial breeding. In 2002, a total of 80 hatching batches were made, most of them were artificial insemination eggs (60 times) and some (20 times) were naturally spawned. The fertilization rate was (44.03 ± 21.99)% and the hatching rate was (65.76 ± 19.48)%. A total of 349.9 thousand seedlings were obtained. The eel 鲡 embryos and early larvae were continuously recorded. At the water temperature of 20.5 ℃, the embryo development takes 49h, the accumulated temperature is 1005 ℃ .h. When the water temperature is 22.5 ℃, the embryo development requires 39h, the required temperature is 878 ℃ .h. When the water temperature is 24.5 ℃ , Embryo development takes 34h, the required accumulated temperature 833 ℃ .h.