太湖梅梁湾大型生态控藻围栏内鲢鳙的生长特征

富营养化湖泊围栏养殖鲢（Hypophthalmichthys molitrix）、鳙（Aristichthys nobilis）控制蓝藻水华在生物操纵示范中得到了广泛应用。在2004和2005年,研究了太湖梅梁湾生态修复区内大型生物控藻围栏中鲢鳙的季节生长特征,分析了影响其生长的因素。结果表明,鲢鳙生长受养殖密度的影响...

The Growth Characters of Hypophthalmichthys molitrix and Aristichthys nobilis in Large Fish Pens in the Meiliang Bay of Lake Taihu

Silver carp （Hypophthalmichthys molitrix） and bighead carp （Aristichthys nobilis） was widely pen-cultured in Chinese eutrophic lakes for the control of cyanobacterial blooms. In 2004 and 2005, the growth characters of pen-cultured silver and bighead carp was studied in the large biomanipulation fish pens in the Meiliang Bay of Lake Taihu. The results showed that the growth rates of silver and bighead carp were significantly influenced by the stocking density. The average growth rates of silver and bighead carp was 6.07 g/day and 11.29 g/day in 2004 with a low stocking density, and 4.30 g/day and 5.09 g/day in 2005 with a high stocking density, respectively. The growth speed of bighead carp was higher than silver carp＇s, but the influence by the stocking density of its growth rate was stronger than bighead carp＇s. Growth rate of silver carp showed a single peak in one year, which had significantly positive correlation with water temperature. However, growth rate of bighead carp showed two peaks during May to Jun and September to October, and the outbreak of cyanobacterial blooms seemed to hinder the growth of bighead carp in summer. In order to reach the commercial specification in one-year culture, the initial stocking density of fingerlings should less than 12 g/m3 at the beginning of the year in the Meiliang Bay of Lake Taihu.