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首页> 外文期刊>Cybium >Reproductive biology of the Cichlidae Tylochromis jentinki in Ebrie lagoon (Ivory Coast)
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Reproductive biology of the Cichlidae Tylochromis jentinki in Ebrie lagoon (Ivory Coast)

机译：Ebrie泻湖（象牙海岸）的丽鱼科鱼类的生殖生物学

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This work describes some aspects of reproductive biology of the Cichlidae Tylochromis jentinki (Steindachner, 1895) in Ebrie lagoon (Ivory Coast). Fish were sampled with gill nets from February 2004 to January 2006. The whole sample consisted in 1850 specimens with standard length (SL) ranging from 75 to 235 mm and weight from 11.90 to 407.57 g. Immediately after capture, SL was taken to the nearest 1 mm, and total body weight (TW) and eviscerated body weight (EW) to the nearest 0.1 g. The gonads and the liver were then removed, weighed to the nearest 0.001 g. The reproductive period of T jentinki was established by analysing the temporal evolution in the frequency of the maturity stages and monthly variations in the gonadosomatic index (GSI), the hepatosomatic index (HSI) and the condition factor (K). Sex-ratio was established taking into account the sex determinations. The sizes at which 50% of the specimens became mature (L-50) were estimated by means of logistic function that was fitted to the proportion of the mature individuals using a nonlinear regression. The sex-ratio for the overall sample showed a statistically significant predominance of females (1: 1,2; chi(2) = 14.54; n = 1850; p < 0.05). The first sexual maturity size was 118 mm (SL) for males and 126 mm for females. The smallest mature female was 81 mm (SL) while the smallest mature male was 93 mm (SL). Both monthly gonadosomatic index and macroscopically determined gonad stages strongly indicate that Tylochromis jentinki in Ebrie lagoon spawns in April and from October to December. Tylochromis jentinki exhibits a breeding strategy in relation to the lowest salinity and the food variability conditions. The reproduction of this species was synchronised to take advantage of the beneficial optimal environmental conditions in order to ensure greatest survival of the young. During oocyte growth, the hepatosomatic index and the condition factor increased. On the other hand, spawning leads to a decrease of HSI and K. Absolute fecundity was 105 and 465 oocytes for females of 114 and 230 mm (SL). The mean relative fecundity was 2223 +/- 765 ovocytes Kg(-1) of females. The mean oocyte diameter was 5.51 +/- 0.27 mm at spawning.
机译：这项工作描述了Ebrie泻湖（象牙海岸）的丽鱼科鱼（Cichlidae Tylochromis jentinki）（Steindachner，1895年）的生殖生物学的某些方面。从2004年2月至2006年1月，用刺网对鱼进行取样。整个样本包括1850个标本，标准长度（SL）为75至235 mm，重量为11.90至407.57 g。捕获后立即将SL取至最接近的1毫米，将总体重（TW）和内脏体重（EW）取至最接近的0.1克。然后除去性腺和肝脏，称重至最接近0.001 g。通过分析成熟期频率的时间演变以及性腺体指数（GSI），肝体指数（HSI）和条件因子（K）的每月变化，来确定T jentinki的生育期。建立性别比例时要考虑性别决定。通过逻辑函数估计50％样本成熟的大小（L-50），使用非线性回归将其拟合为成熟个体的比例。总体样本的性别比显示出统计学上显着的女性优势（1：1,2; chi（2）= 14.54; n = 1850; p <0.05）。男性的第一性成熟度为118毫米（SL），女性为126毫米。最小的成熟雌虫为81毫米（SL），而最小的成熟雄虫为93毫米（SL）。每月性腺体指数和宏观确定的性腺阶段都强烈表明，埃布里泻湖中的Tylochromis jentinki于4月和10月至12月产卵。泰勒克氏菌（Tylochromis jentinki）表现出与最低盐度和食物变异性条件有关的育种策略。同步繁殖该物种，以利用有利的最佳环境条件，以确保年轻人的最大生存。在卵母细胞生长期间，肝体指数和条件因子增加。另一方面，产卵会导致HSI和K降低。对于114和230 mm（SL）的雌性，绝对繁殖力是105和465卵母细胞。平均相对繁殖力是女性的2223 +/- 765卵母细胞Kg（-1）。产卵时平均卵母细胞直径为5.51 +/- 0.27 mm。

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