2种饵料及其混合物对L-型褶皱臂尾轮虫生长繁殖的影响

Effect of Different Diets on Growth and Reproduction of Brachionus Plicatili Typycus

采用海水小球藻(Chlorella vulgaris)、面包酵母(Saccharomyces cerevisiae)和海水小球藻与面包酵母混合3种饵料对海水养殖鱼类育苗的常用饵料L-型褶皱臂尾轮虫(Brachionus plicatilis typycus)进行7天的培养,观察3种饵料对L-型褶皱臂尾轮虫的生长和繁殖的影响。研究表明:L-型褶皱臂尾轮虫的体宽在7天之内变动不大,各种饵料对L-型褶皱臂尾轮虫的体宽影响差异不显著;但对L-型褶皱臂尾轮虫密度的影响较大,一般于第4天开始显著增加。其中以混合组饵料培养的L-型褶皱臂尾轮虫密度最大,第7天可达到155个/ml;面包酵母组次之,小球藻组最少。此外,各种饵料对L-型褶皱臂尾轮虫的怀卵率有一定影响,其中以混合组的怀卵率最高,第3天达到70%,其次是面包酵母组,海水小球藻组最低。因此可采用海水小球藻与面包酵母混合培养L-型褶皱臂尾轮虫;在海水养殖鱼类育苗中,需提前3-4天培养轮虫,以提供充足的饵料。

Brachionus plicatilis typycus were raised for seven days with different diets including sea water chlorellas （Chlorella vulgaris ） p, baker＇s yeast and mixed feed （chlorellasp in combination with baker＇s yeast）, and the effect of three diets on the growth and repro- duction of Brachionus plicatilis typycus were studied. Results show： the rotifer body width changed little in seven days ; the effect of the above three diets to the rotifer body width was not significant ; yet the effect to the rotifer density was more significant, usually with sig- nificant increase from the fourth day. Mixed diets affected the rotifer density most and the increase could reach 155 individuals/ml on the seventh day; baker＇s yeast was the second, chlorellasp the least. Besides, all diets had certain influence on the rotifer fecundity ra- tio （eggs carried）： the rotifer fecundity rate of mixed diets were highest and could reach 70% on the third day, baker＇s yeast was sec- ond, chlorellasp the lowest. Therefore, chlorellasp in combination with baker＇s yeast can be used when Brachionus plicatilis typycns are raised, and rotifer should be raised three or four days in advance in order to offer enough diet to ocean fish larval.