论文部分内容阅读
依据１９９２年和１９９３年４～５月收集的样本，分析保安湖乌鳢渔获群体结构和生长特征。年龄由Ⅰ～Ⅶ龄构成，Ⅰ～Ⅳ龄分别占渔获总尾数的１２．３７％、２４．７４％、４１．２４％和１７．５３％。Ⅴ～Ⅶ龄极少仅占４．１２％。优势体长为３１～４２ｃｍ；优势体重为３５０～９５０ｇ。体长与体重关系为Ｗ＝０．００７９９１Ｌ３．１６０２。ＶｏｎＢｅｒｔａｌａｎｆｙ生长方程为Ｌｔ＝７７．３（１－ｅ－０．１９８８（ｔ＋０．６０６７），Ｗｔ＝７４０７（１－ｅ－０．１９８８（ｔ＋０．６０６７）３．１６０２。拐点年龄ｔ１＝４．９８ａ，拐点体重Ｗ１＝２０５９ｇ。综合分析的结果表明现行捕捞不合理，建议将捕捞年龄提高到４～５ａ，相应体长４５～５０ｃｍ，体重１３００～２０００ｇ。
Based on the samples collected from 1992 to April and May to 1993, the population structure and growth characteristics of the catfish were analyzed. The ages were from Ⅰ to Ⅶ, and the I ~ Ⅳ ages accounted for 12.37%, 24.74%, 41.24% and 17.53% of the total mantissa, respectively. Ⅴ ~ Ⅶ very few only account for 4.12%. Advantage body length of 31 ~ 42cm; dominant weight of 350 ~ 950g. The relationship between body length and body weight is W = 0.007991L3.1602. The VonBertalanfy growth equation was Lt = 77.3 (1-e-0.1988 (t + 0.6067), Wt = 7407 (1-e-0.1988 (t + 0.6067) 3.1602. , Inflection point weight W1 = 2059g.A comprehensive analysis of the results show that the current fishing is unreasonable, the proposed fishing age increased to 4 ~ 5a, the corresponding body length 45 ~ 50cm, weight 1300 ~ 2000g.