论文部分内容阅读
一、采集受精卵。每年5～8月是黄鳝的产卵季节,产卵时间一般在雷雨后的夜晚或凌晨。黄鳝产卵时,亲鱼先吐泡沫堆成巢,然后把卵产在泡沫中,产卵数量一百至数百粒。卵膜半透明,卵黄呈黄色,内有油球。产卵后周围如有水草,无大风,泡沫能保持到鳝苗出膜,如遇大风,鳝苗卵会沉入洞口附近水底。此时,可用纱布做的小抄网在洞口旁采集。采集的受精卵放入脸盆或木桶内,置于室内孵化,每天换水1次,6～7天后鳝苗逐渐出膜,出膜后5～7天开食。此时需扩大容器,加喂浮游动物,待其长至30毫米以上时,即可放入鳝
First, collecting fertilized eggs. May to August each year is the eel spawning season, spawning time is generally night or early morning after a thunderstorm. Eel spawning, the broodstock first spit foam pile nest, and then the eggs in the foam, the number of eggs from one hundred to hundreds. Egg translucent, yellow yolk, there is a ball of oil. After the spawning of aquatic plants if there is no gale, the foam can remain emerald out of the film, in case of strong winds, eel seedlings will sink into the hole near the bottom of the hole. At this point, can be made of gauze made in the hole next to the collection. Collection of fertilized eggs into the basin or barrel, placed indoors hatch, change the water 1 day, 6 to 7 days after the eel seedlings gradually out of the film, the membrane after 5 to 7 days to eat. At this point need to expand the container, add feeding zooplankton, until its length up to 30 mm or more, you can put eel