摘要
2004年5～8月中华鲟幼鱼降河洄游途中在长江口聚集期间,收集到196ind幼鱼样本,分析研究了其生长特点.结果显示,中华鲟幼鱼在长江口逗留期间生长迅速,体长和体重分别从5月下旬刚到达长江口时的16.68±3.27cm和28.69±16.06g增加到8月份入海时的31.90±7.77cm和236.77±176.64g,体长增长1.91倍,体重增加8.25倍.中华鲟幼鱼体重与体长呈幂函数关系,其幂指数b值在5月和8月小于3,此时表现出异速生长.b值在6月和7月接近于3,呈等速生长.6月和7月的肥满度也高于5月和8月.表明6月和7月的生长情况要好于5月和8月.这一现象可能是中华鲟幼鱼在5月和8月有2次生活环境改变和食性变化所导致.
The growth of juvenile Chinese sturgeon Acipenser sinensis （n = 196 ） collected from the Yangtze River estuary during May-August, 2004 was investigated in this paper. The juveniles grew fast when they inhabited the Yangtze estuary. The juveniles＇ body length increased from 16.68±3.27 cm in May to 31.90±7.77 cm in August, and its body weight increased from 28.69±16.06 g in May to 236.77 ±176.64 g in August. The relationship between BL and BW was exponential, and the exponential value “b” was under 3 in May and August, and close to 3 in June and July. This means that fish had an isometric growth in June and July, and allometric growth in caused by the habitat and food May and August. The results may infer that the growth differences may be changes in May and August when young fish migrated from fresh water to the ocean.
出处
《海洋渔业》
CSCD
2005年第3期177-181,共5页
Marine Fisheries
基金
国家自然科学基金重大项目(编号:30490234)
上海高校水产养殖学E-研究院建设项目(编号:E03009)
国家科技部科技基础性工作和社会公益研究专项(编号:2003DIB4J129)
上海市长江口中华鲟自然保护区专项
关键词
中华鲟
长江口保护区
异速生长
等速生长
肥满度
变异系数
Acipenser sinensis
Yangtze River estuary
isometric growth
allometric growth
relative fatness
coefficient of variation
