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首页> 外文期刊>Aquatic Living Resources >Influence of salinity on the life-history traits of the West African black-chinned tilapia (Sarotherodon melanotheron): Comparison between the Gambia and Saloum estuaries
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Influence of salinity on the life-history traits of the West African black-chinned tilapia (Sarotherodon melanotheron): Comparison between the Gambia and Saloum estuaries

机译：盐度对西非黑chin罗非鱼（Sarotherodon melanotheron）生活史特征的影响：冈比亚和萨卢姆河口的比较

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The West-African neighbouring Gambia and Saloum estuaries function in different ways, the first being normal (saltier waters in the lower river, salinity range 0-38) and the second being inverse (saltier waters in the upper river. salinity range 36-90). The common cichlid species Sarotherodon melanotheron was collected in both systems over 16 months (June 2001 to September 2002) at five locations. We quantified reproductive traits from macroscopic examination of the gonads, oocyte counts and measurements, and growth from interpretation and measurements of an otolith sub-sample. There was a clear seasonal cycle of reproduction in the estuaries with a peak at the beginning of the wet season (May-July). Size at maturation was smaller in the more saline environment, the Saloum, for both females (170 mm in Gambia and 131 mm in Saloum) and males (162 and 113 mm respectively). The relative fecundity was lower and the oocyte size was bigger in the freshwater location of the Gambia river. Growth, estimated by counting the annual opaque zones on whole otoliths, was reduced in the hypersaline environment of the Saloum (L-infinity = 198 mm, K = 0.26). Differences are less obvious between the growth in the Gambia (L-infinity = 238 mm, K = 0.21) and that in the Saloum with a salinity of less than 60 (L-infinity = 244 mm, K = 0.22). All these observations suggest that S. melanotheron is able to withstand saltier environments by limiting its growth, reducing the size-at-maturity, and changing its fecundity, but the most profound changes are only visible in hypersaline conditions.
机译：西非邻近的冈比亚河口和萨卢姆河口以不同的方式发挥作用，第一个是正常的（下游河的咸水，盐度范围为0-38），第二个是倒流的（上游河水的咸水区，盐度范围为36-90） ）。在两个系统的六个月（2001年6月至2002年9月）中，在五个位置收集了常见的丽鱼科物种Sarotherodon melanotheron。我们从性腺的宏观检查，卵母细胞计数和测量以及耳石子样本的解释和测量的生长中量化了生殖性状。河口有一个明显的季节性繁殖周期，在雨季开始时（5-7月）达到峰值。雌性（冈比亚170毫米和Saloum 131毫米）和雄性（分别为162毫米和113毫米）的盐溶液在盐度更高的Saloum中更小。冈比亚河淡水区的相对繁殖力较低，卵母细胞大小较大。通过计算整个耳石上的年度不透明区域来估算的生长在Saloum的高盐环境中减少了（L-无穷大= 198 mm，K = 0.26）。冈比亚（L-无穷大= 238 mm，K = 0.21）和盐度小于60的Saloum的生长之间的差异不太明显（L-无穷大= 244 mm，K = 0.22）。所有这些观察结果表明，黑腹链球菌能够通过限制其生长，减小成熟度并改变其繁殖力来抵御更咸的环境，但是最深刻的变化只有在高盐度条件下才可见。

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