Early Morphogenesis And Growth Of Five Species Of Cyprinidae In The Yangtze River

Early morphogeny and growth of five species of Cyprinidae in the Yangtze River, Ancherythroculter nigrocauda, Spinibarbus sinensis, Procypris rabaudi, Gobiocypris rarus and Sinilabeo rendahliwere studied. The specific contents included early morphogeny, growth, starvation and preserved larvae's shrinkage. The main results were generalized as follows:1. The early morphogeny of A. nigrocauda and S. sinensis were recorded in detail from fertilization to hatching. The embryonic developments of the two species were divided into 20 stages based on the morphological characteristics. Fertilized eggs of A. nigrocauda incubated at an average temperature of 26.5℃(25.7-27℃) hatched at 43h15min after insemination. Fertilized eggs of S. sinensis incubated at 24℃hatched at 85h26min after insemination. Postembryonic developments were divided into larval stage, juvenile stage and young fish stage according to the appearance and the formation of scales. A. nigrocauda larvae were reared at 21.8-28.2℃, and 50% larvae developed into juvenile stage 30d after hatching. S. sinensis larvae were reared at 21.5-28℃, and 50% larvae developed into juvenile stage 30d after hatching.2. Remarkably different growth rates of S. sinensis larvae were observed when feed on egg-yolk, Artemia nauplii and soybean milk respectively during initial feeding...