Biology of Mature 0<sup>+</sup> Crabs, <i>Eriocheir sinensis</i>(I):Body Characteristics and Changes of Sexual Gland
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本文描述了一秋龄性腺成熟中华绒螯蟹(简称河蟹)的外部特征并与一秋龄未成熟及二秋龄成熟河蟹进行比较, 同时给出了体重与壳宽的回归方程.保安湖的研究结果表明, 对于一秋龄雌蟹, 体重大于29.8g(壳宽为4.03cm)全部成熟, 而体重小于13.1g(壳宽为3.00cm)均不成熟, 体重在13、1-29.8g之间, 既有成熟又有未成熟.对于一秋龄雄蟹, 体重大于26.0g(壳宽3.91cm), 全部成熟, 而于12.0g壳宽2.66cm)均未成熟, 体重在12.0-26.0g之间, 既有成熟者又有未成熟个体.对一秋龄成熟河蟹成熟系数逐月变化的观察表明, 在翌年3月份达到峰值, 雌蟹为12.32± 1.75%, 雄蟹为 4.24± 0.06%;此后, 性腺迅速退化, 至翌年七月上旬, 卵巢退变成细索状结构.己无完整的卵粒.;This paper describes the characteristics of mature 0<sup>+</sup> crabs, Eriocheir sinensis, and its regression relationship between body weight (BW) and carapace width (CW).For the 0<sup>+</sup> female crabs, when BW>29.8g(CW>4.03cm), the sexual gland is mature;when BW< 13.lg (CW <3.00cm), the sexual gland is immature.When BW ranges 13.1 -29.8g, some crabss are ma-true, some crab are immature.For the 0<sup>+</sup> male crabs, when BW >26.Og (CW >3.91cm), all the crabs are mature;when BW< 12.0g (CW<2.66cm), immature.The sexual gland degrades from then on.In the first ten-day period of next July, the ovary looks like the slender t
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本文描述了一秋龄性腺成熟中华绒螯蟹(简称河蟹)的外部特征并与一秋龄未成熟及二秋龄成熟河蟹进行比较, 同时给出了体重与壳宽的回归方程.保安湖的研究结果表明, 对于一秋龄雌蟹, 体重大于29.8g(壳宽为4.03cm)全部成熟, 而体重小于13.1g(壳宽为3.00cm)均不成熟, 体重在13、1-29.8g之间, 既有成熟又有未成熟.对于一秋龄雄蟹, 体重大于26.0g(壳宽3.91cm), 全部成熟, 而于12.0g壳宽2.66cm)均未成熟, 体重在12.0-26.0g之间, 既有成熟者又有未成熟个体.对一秋龄成熟河蟹成熟系数逐月变化的观察表明, 在翌年3月份达到峰值, 雌蟹为12.32± 1.75%, 雄蟹为 4.24± 0.06%;此后, 性腺迅速退化, 至翌年七月上旬, 卵巢退变成细索状结构.己无完整的卵粒.;This paper describes the characteristics of mature 0<sup>+</sup> crabs, Eriocheir sinensis, and its regression relationship between body weight (BW) and carapace width (CW).For the 0<sup>+</sup> female crabs, when BW>29.8g(CW>4.03cm), the sexual gland is mature;when BW< 13.lg (CW <3.00cm), the sexual gland is immature.When BW ranges 13.1 -29.8g, some crabss are ma-true, some crab are immature.For the 0<sup>+</sup> male crabs, when BW >26.Og (CW >3.91cm), all the crabs are mature;when BW< 12.0g (CW<2.66cm), immature.The sexual gland degrades from then on.In the first ten-day period of next July, the ovary looks like the slender t
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