不同魚卵的孵化方法及羅非魚繁殖.ppt

不同魚卵的孵化方法,Hatching methods of different fish eggs,一、常見魚卵的類型 common types of fish eggs,1、浮性卵 floating eggs 卵的比重小于水，漂浮于水面或懸浮于水層中，大多無色透明。 gravity of eggs is less than water, so eggs can float on the surface of water or suspend in water. Most of them appear colorless and transparent. 大多數(shù)海水魚類屬此，有少數(shù)淡水魚類如鱖魚卵。 most of marine fish eggs and few kinds of freshwater fish eggs, such as mandarin fish eggs, belong to floating eggs.,2、粘性卵：卵重于水，卵膜有粘性，附著在水草、石礫或其他物體上。少數(shù)海水魚類，多數(shù)淡水魚類。 adhesive eggs: gravity of eggs is heavier than water. Adhesive eggs can sick on water weeds, pebble and other substances because of its sticky egg membrane. Eggs of Most kinds of freshwater fish species and few marine water fish species belong to adhesive eggs. such as catfish and mirror carp. 如胡子鯰，鏡鯉都是,3、沉性卵：沉于水底的沙礫中。 Sinking eggs: sinking eggs can sink into grit at the bottom of ponds. Such as huso dauricus, sturgeon, trout, loach and so on. 如鰉、鱘、鮭鱒及鰍科魚類,4、漂流性卵（半浮性卵）： 隨水流漂流，靜止時沉于水底。 Drifting eggs(semifloating eggs): drifting eggs can drift with current of flowing water and sink down to the bottom of ponds in static water body. Such as Chinese grass carp, silver carp. 如中國的草魚，花鰱，白鰱都是。,二、不同魚卵的孵化方法 hatching methods of different fish eggs,1、浮性卵 floating eggs 這種卵的孵化，只要保證水質，溫度，溶氧在不同的容器內都可以孵化?？梢岳?漂流性卵（半浮性卵）的孵化設備。 As long as We guarantee proper water quality, water temperature and dissolved oxygen. Floating eggs can be hatched out in different containers. We can even make use of incubator for drifting eggs.,2、粘性卵 adhesive eggs 有兩種孵化模式 two types of hatching mode 1）粘附孵化 sticking hatching 2）脫粘孵化 debonding hatching,3、沉性卵： sinking eggs 流水孵化 flowing water hatching,4、