黑龙江抚远江段红鳍原鲌Cultrichthys erythropterus的年龄与生长

2014年7~10月在黑龙江干流抚远江段采集红鳍原鲌Cultrichthys erythropterus样本249尾,研究抚远江段红鳍原鲌种群的年龄结构与生长特性。结果表明,黑龙江抚远江段红鳍原鲌种群的年龄组成为1~7龄,以4~5龄鱼为主,占总样本量的67.8%;红鳍鲌为异速生长型,其体长和体质量的关系为W=0.0038L~(3.403)(n=248,R2=0.99,P0.01),红鳍原鲌体长与体质量的生长符合Von Bertalanffy生长方程:Lt=46.3171-e~(-0.174(t+0.235))],Wt=1 771.3251-e~(-0.174(t+0.235))]3.403,其生长拐点为t=6.80龄,对应的体长和体质量分别为32.70cm和541.66g。建议捕捞规格提高到体长300mm或体质量500g以上,以可持续开发利用黑龙江抚远江段红鳍原鲌渔业资源。

Age and Growth of Redfin Culter Cultrichthys erythropterus in Fuyuan Reach of the Heilongjiang River

The age and growth of redfin culter Cultrichthys erythropterus were studied based on 249 samples collected from Fuyuan reach of the Heilongjiang River from July to October.The results showed that there were 7 age classes ranging from 1 year to 7 years in the population,with preponderant age classes of 4～5 years old,and accounting for 67.8％ of the total population.The relationship between body weight and body length was described by the equation:W=0.0038L3403 (n=248,R2=0.99,P＜0.01),and the Von Bertalanffy growth function was expressed as Lt=46.317 1-e0.1 (t+0.235],Wt=1771.325 1-e-0.174(t+0.235]3403,with the growth inflexion point of 6.8 years in body weight.The findings suggest that the captive redfin culter be the individuals with body length of over 300 mm or body weight of above 500g.