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首页> 外文期刊>Nigerian Journal of Animal Production >Sex ratio and fecundity of Chrysichthys nigrodigitatus (Family -Claroteidae) from Asejire Lake, Nigeria
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Sex ratio and fecundity of Chrysichthys nigrodigitatus (Family -Claroteidae) from Asejire Lake, Nigeria

机译：尼日利亚Asejire湖的Chrysichthys nigrodigitatus（科-Claroteidae）的性别比和繁殖力

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摘要

Sex ratio and fecundity of Chrysichthys nigrodigitatus from Asejire Lake were examined. The length-weight relationship showed that weight was curvilinearly related to standard length. The logarithm transformation of weight against standard length gavea straight-line graph represented bv the following equation: Log W = -0.66 + 2.13 Log sl; r~2 = 0.854; (p<0.001) n = 209. Males were generally more with a male : female ratio of 1:0.18. The average fish weight was 88.97g (16.28 cm standard length). Sexual maturity was attained at an average size of 45.0% (14.0 cm standard length). Relative fecundity was dependent on body weight and standard length (P < 0.05 and P < 0.01 respectively). Chrysichthys nigrodigitatus expended between 0.75% - 27.30% of bodyweight in egg production. The condition factor values showed that a female specimen of equal length with a male specimen is heavier. Six gonad maturity stages were identified, ovary and gonad weights increased with stage of maturity.
机译：研究了来自Asejire湖的Chrysichthys nigrodigitatus的性别比和繁殖力。长度与重量的关系表明重量与标准长度呈曲线关系。权重对标准长度的对数变换给出的直线图由以下方程式表示：Log W = -0.66 + 2.13 Log sl; r〜2 = 0.854; （p <0.001）n =209。男性通常较多，男女比例为1：0.18。鱼的平均重量为88.97克（标准长度16.28厘米）。性成熟度达到平均大小45.0％（标准长度14.0 cm）。相对繁殖力取决于体重和标准长度（分别为P <0.05和P <0.01）。 Chrysichthys nigrodigitatus的产蛋量占体重的0.75％-27.30％。条件因子值表明，与男性标本长度相等的女性标本较重。确定了六个性腺成熟阶段，卵巢和性腺的重量随着成熟阶段的增加而增加。

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