赤潮异弯藻对鳀鱼早期发育的影响

就赤潮异弯藻(Heterosigma akashiwo)藻液及各组分对鳀鱼(Engraulis ja ponicus)早期发育阶段的影响进行了研究。并就鳃鱼早期发育过程中对赤潮异弯藻的敏感性时期作了探讨。实验结果表明，原肠期前的发育卵和初孵仔鱼对赤潮异弯藻较其他发育阶段更为敏感。在同等条件下藻细胞内容物对鳃鱼早期发育各阶段的毒性最大，其次是藻细胞碎片和藻液，去藻过滤液的毒性最小。暴露在高浓度90000c／ml藻细胞内容物中，96h后仔鱼的存活率为4％；而在同浓度的去藻过滤液中，96h后仔鱼的存活率为75％。藻细胞内容物和藻细胞碎片对鳃鱼仔鱼96hI。C∞分别为2818、6760c／mL．

The effects of Heterosigma akashiwo on the early development of anchovy (Engraulis japonicus)

The effects of cells and cells different fractions of Heterosigma akashiwo on the early development of Engraulis japonicus were studied.The sensitive to algle toxin in the early development of Engraulis japonicus was discussed too.The results indicated that the fertilized eggs before blastula and yolk-sac larva of Engraulis japonicus were more sensitive to algle toxin than other development stage.In the same conditions the toxic effect of cell contents on the early development of Engraulis japonicus was highest, cell-free medium was lowest ,algal culture and cell fragments were in the middle.The survival rate was 4% when Engraulis japonicus in the pre-larval-stage was exposed for 96 hours to cell contents at a high concentration of 90 000 cells/ml but the survival rate was 75% when exposed to cell-free medium.LC 50 values at 96 hours exposed to cell contents and cell fragments were 2 818 and 6 760cells/ml.