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于 2001年 5~6月, 对黑龙江中游施氏鲟AcipenserschrenckiBrandt(155尾) 和鳇HusodaurlcusGeorgi(120尾) 的捕捞群体的种群生态学特征进行了调查研究。施氏鲟捕捞群体的结构特征: 全长平均为 147 7 (98~232) cm, 体重为 17 07 (3 5~62 65) kg, 年龄为 16 9 (8~29) 龄, 全长与体重的相关关系为W= 6 9614×10-6L2 9281; 性比为 1∶1 87, 绝对生殖力为 433 496 7 ( 46 200 ~1 318 350) 粒, 相对生殖力为 11 173 3 (6 893~15 694) 粒 /kg, 卵径平均为 3 65 (3 0~4 5) mm,成熟系数平均为 22 49% (12 5% ~33 3% ); 捕捞群体数量 620尾, 计 12t。鳇捕捞群体的结构特征: 全长平均为 241 11 ( 191 ~340 ) cm, 体重为 225 23 ( 24 ~291 ) kg, 年龄为 25 92 ( 14 ~43 )龄, 全长与体重的相关关系为W=1 4924×10-6L3 2944; 性比为 1∶1 5, 绝对生殖力为 1 118 732 5(700 440 ~ 1 515 360 ) 粒, 相对生殖力为 6 360 ( 4 377 ~ 8 770 ) 粒 /kg, 成熟系数为 13 58%(11 59% ~16 57% ); 捕捞群体数量 250尾, 计 114 8t。调查结果表明, 黑龙江中游施氏鲟、鳇资源均呈逐渐下降的趋势。
From May to June 2001, the population ecological characteristics of Acipenserschrencki Brandt (155) and HusodaurlcusGeorgi (120) populations in the middle reaches of Heilongjiang were investigated. The structural characteristics of the sockeye sturgeon fishing population were as follows: the average length was 147 7 (98 232) cm and the body weight was 17 07 (35-62 65) kg and the age was 16 9 (8-29) The correlation coefficient was W = 69614 × 10-6L2 9281, the ratio of male to female was 43731967 (46 200-1 318 350), the relative fecundity was 11 173 3 (6 893 ~ 15 694) grains / kg, average egg diameter 3 65 (30 ~ 45) mm, average maturity coefficient 22 49% (12 5% ~ 33 3%); The structural characteristics of the fishing population were as follows: the average length was 241 11 (191-340) cm, the body weight was 225 23 (24-29) kg, and the age was 25 92 (14-43) years. The correlation between total length and body weight was W = 1 4924 × 10-6L3 2944; the relative sex ratio was 1: 1.5, the absolute fecundity was 1 118 732 5 (700 440-1 515 360), the relative fecundity was 6 360 (4 377-8 770) / kg, and the maturity coefficient was 13 58% (11 59% ~ 16 57%). The number of fishing population was 250, which was 114 8t. The survey results showed that the resources of Amur sturgeon and Amur show a decreasing trend in the middle reaches of Heilongjiang Province.