摘要
本文主要对岐脊加夫蛤幼虫培育的适宜密度进行初步探讨。以壳长为160.3μm的壳顶幼虫进行实验,历时8天。实验结果表明:在水温27—29℃,比重1.020—1.022的条件下,投以等量的异胶藻和牟氏角毛藻的混合饵料,幼虫培育的适宜密度为5—10个/ml。密度为2个/ml幼虫的生长速度快,但变态时存活率较低;而密度为25个/ml幼虫的生长速度缓慢而且变态时存活率低;15个/ml、20个/ml幼虫的生长缓慢,但变态时存活率高。
The present paper reports the results of a study on the rearing density on growth and survival of the larvae of Gafrarium dtvaricatum (Gmelin). The umbo larvae at 160. Spun long were selected for tests. The results were as follows:
Under the conditions of about 27 -29 C in water temperature and 1. 020 - 1. 022 in conditional specific weight of the sea water, being given a mixed diet of Chaetoceros muel-leri and Heterogloea sp. , the suitable rearing density of the larvae lies between 5 -10ind/ml, At 2ind/ml in density the larvae show faster growth, higher mortality; At 25ind/ml the larvae show slower growth and higher mortality; At 15ind/ml and 20ind/ ml both larvae grow slowly but lower mortality.
出处
《福建水产》
1997年第1期22-26,共5页
Journal of Fujian Fisheries
