太湖产乔氏短吻银鱼的胚胎发育

ON THE EMBRYONIC DEVELOPMENT OF SALANGICHTHYS (NEOSALANX) JORDANI IN TAI HU LAKE

本文阐述了乔氏短吻银鱼受精卵的发育与孵化过程,并联系其胚胎发育的形态生态特点,建议保护产卵基质——沉水植物,以增殖银鱼。同时认为,以活卵为材料,向某些水库和内陆湖泊移殖这种经济鱼类是有实践意义的。

The short--snout icefish, Salangichthys (Neosalanx) jordani Wakiya & Takahasi,is one of commercial fishes in Tai Hu Lake. Experiments on artifical fertilization ofthe fish were carried out in spring of 1981 and 1983.The ripe egg of the icefish is spherical, on the egg membrance there bear 8--13slender filaments radiating around the margin of micropyle, the filament are dichoto-mously divided directing to the opposite pole of the micropyle and connected each otherto make a network covering almost the entire surface of the egg. The eggs are strongsticky, the spawned eggs attach on the submerged plants and other matrix in thewater. The diameter of swollen egg is 0.59--0.73mm, average 0.64mm. The embryohatched out 149 hours after the fertlization, 865 prelarvae were obtained in the experi-ment. The protection of spawning ground of the icefish, especially the submergedplants is proposed.