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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。
From June to August 2004, juvenile Chinese sturgeon migrated down the river and collected 196 ind juveniles during their migration. The characteristics of their growth were analyzed. The results showed that juvenile Chinese sturgeon grew rapidly during its stay in the Yangtze River estuary. Body length and body weight increased from 16.68 ± 3.27cm and 28.69 ± 16.06g, respectively, at the time of entering the Yangtze River in late May to 31.90 ± 7.77cm And 236.77 ± 176.64g respectively, the body length increased by 1.91 times and body weight increased by 8.25 times. The body weight and body length of Chinese sturgeon (Acipenser sinensis) showed a power function relationship, and its power exponent b was less than 3 in May and August, at which time it showed allometric growth. The b value approached 3 in June and July, showing constant growth. The plumpness in June and July was also higher than in May and August. This shows that the growth in June and July is better than in May and August. This phenomenon may be caused by two changes in living environment and diet changes of juvenile Chinese sturgeon in May and August.