湖泊网围养鱼不同放养结构的研究

Studies on Aquaculture Model of Pen Fish Farming in Gehu Lake

本试验分3年进行,在3个667平方米的网围内采取主养草鱼(草鱼占草食性鱼类80％),主养团头鲂(团头鲂占80％)和草鱼、团头鲂并重(草鱼、团头鲂各占50％)的三种放养结构;每个网围第1年放草食性鱼种50公斤,第二年放种100公斤,第三年放种150公斤,以比较其养殖效益。经三年试验,其产量、增重倍数、产值、投入产出比:放养草食性鱼种50公斤时,草鱼、团头鲂并重的放养结构的四项指标最佳,分别为281.7公斤、4.8、1890.2元、1:1.33;放种量100公斤时,主养团头鲂的放养结构的四项指标最佳,分别为551.4公斤、4.8、3740.6元、1:1.74;放种量150公斤时,主养团头鲂的养殖结构的四项指标最佳,分别为795公斤、4.9、5460元、1:1.79。四项指标以放种量在100公斤和150公斤时为最佳。因此,浅水草型湖泊在进行小块网围精养时,以采用主养团头鲂或团头鲂、草鱼并重,放养量100～150公斤的结构为好。

This paper deals with the comparison among three different aquaculture models of culturing fishes in pen with the grass carp as the major species,the blunt snout bream as the major species and both these fishes as the major species. The results shows that when the stocking rate of herbivorous fishes was 100-150kg/667m3, the latter two models were better than the former one in the four targets of yields, gained weight rates of fish,output values,and input to output ratios.