饵料对河蟹溞状幼体变态发育的影响

报道饵料对河蟹状幼体 ( Z1～ Z3)变态的影响。结果表明 :梅尼小环藻是 Z1的适口饵料 ,适量投喂浓度为 80万个 /ml至 1 0 0万个 /ml;投喂衣藻或小环藻与衣藻的等浓度混合饵料都不能使 Z1顺利变态为 Z2 。2 0个 /ml褶皱臂尾轮虫密度是适于 Z2 的饵料密度 ,轮虫密度低于 5个 /ml或高于 40个 /ml都对 Z2 的变态有不良影响。另外 ,投喂 60万个 /ml小环藻加 2 0个 /ml轮虫混合饵料对 Z2 变态发育更为有利 ;而用 2 0万个 /ml衣藻加 2 0个 /ml轮虫投喂 Z2 ,却使 Z2 的变态率明显降低。 30个 /ml轮虫密度是适于 Z3的饵料密度 ,轮虫密度低于 2 0个 /ml或高于 40个 /ml都会对 Z3变态产生不良影响。

The effects of different diet on metamorphosis and development of Eriocheir si nensis zoeae larvae

This paper was reported that effects of different diet on the metamorphosis of Eriocheir sinensis zoeae larvae. The results showed that Cyclotella meneghiniana was suitable diet for the Z 1 larvae, Suited feeding density of diet was form 800 000 ind/ml to 1 000 000 ind/ml. Chlamydomonas sp. wasn't suitable diet for the Z 1 larvae, It didn't successfully make the Z 1 larvae metamorphose that fed mixture with C. sp. and C.meneghiniana to the Z 1 larvae. That fed the Brachinous plicatilis density which was less than 5 ind/ml or more than 40 ind/ml to the Z 2 larvae could badly affect the metamorphosis of the Z 2 l arvae. The feeding suitable density for the Z 2 larvae was 20 ind/ml of B.p licatilis. F eeding both 600,000 ind/ml C.meneghiniana and 20 ind/ml B.plicatilis was more available to the metamorphosis for the Z 2 larvae, but feeding both 200,0 00 ind/ml C. sp. and 20 ind/ml B.plicatilis could obviously make the met amorphosis of the Z 2 larvae decrease. That fed the B.plicatilis density wh ich was less than 20 ind/ml or more than 40 ind/ml could badly affect the metamorphosis of the Z 3 larvae, the feeding suitable density for the Z 3 larvae was 30 ind/ml of B.p licatilis.