翡翠贻贝幼虫饲料的初步研究

本文介绍了翡翠贻贝幼虫饲料的研究成果。翡翠贻贝的受精卵在水温27．7—29．3℃，48小时就发育成早期直线绞合期幼虫，开始具有摄食食物的能力。此时以球藻为饲料的幼虫，其生长速度与不投饲料的相似，而活动能力反比不投饲料的差，至第7天就全部死亡；以扁藻为饲料的幼虫其早期生长也同不投饲的近似；以酵母的饲料的幼虫生长快，存活率高。但当发现到了壳顶幼虫期，以酵母为饲料的，生长发育慢，活动能力弱，死亡率高；以扁藻为饲料的生长发育快，但死亡率较高。对于壳顶期幼虫如果饲以酵母和扁藻的混合饲料，则生长速度同单独饲以扁藻的接近，但明显地能提高幼虫的活动能力和存活率。

A PRELIMINARY STUDY ON THE FOOD OF THE LARVAE OF GREEN MUSSEL, MYTILUS VIRIDIS

The larvae of green mussel Mytilus viridis was able to ingest micro-organismsfrom sea water after 48 hours from fertilization. The larvae might survive and keepswimming for several days even lack of food. The experiment shows that the growth and the survival rates of the larvae havedistinctions by feeding on different foods. The young larvae of green mussel were unable to digest Chlorella sp. and they diedat 6-7 days after fertilization. Platymonas sp. is rather large in sise, young larvae also could not ingest it andalways cause mortality. The larvae of straight-hinged stage can ingest and utilize marine yeast. The larvae grew rapidly and the survival rate is very high. The concentration of yeast is0.9-1.7mg/L. When the larvae developed to early stage of umbo, the yeast alone it was insuffici-ent to meet the nutritional requirement for growth and development, and they canutilize Platymonas sp. as food. The most effective way is to feed them with mixture ofPlatymonas sp. and yeast.