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首页> 外文期刊>Fisheries Research >Studies on aspects of the ecology of the catfish Chrysichthys auratusGeoffrey St. Hilaire (Osteichthyes; Bagridae) in the River Benin (NigerDelta, Nigeria)
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Studies on aspects of the ecology of the catfish Chrysichthys auratusGeoffrey St. Hilaire (Osteichthyes; Bagridae) in the River Benin (NigerDelta, Nigeria)

机译：贝宁河（尼日利亚尼日尔三角洲）Ge鱼Chrysichthys auratus生态学方面的研究Geoffrey St. Hilaire（Osteichthyes; Bagridae）

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摘要

Data on some aspects of the ecology of the catfish Chrysichthys auratus in the Benin river are presented. Fish were captured throughout the year. C. auratus constituted about 63% of the Bagrid catch End favoured the shallow littoral river zone with silty sandy substratum. It attained a total length of 14.6 cm with a weight of 32.0 g. The growth in weight relative to length was isometric and the condition factor ranged from 1.0-2.9. It increased with individual size of fish irrespective of sex and was higher during the wet season than in the dry season. C. auratus fed predominantly in insects, fish and aquatic macrophytes. Crustaceans and algae were a minor part of the diet. It was essentially a night feeder with no clear qualitative variation in feeding habit with size and season. Breeding occurred between May and July and estimates of egg number ranged from 260 to 620. Gonadosomatic index (GSI) values ranged from 2.69 to 19.68. (
机译：提供了贝宁河river鱼Chrysichthys auratus生态学某些方面的数据。全年捕获鱼。 C. auratus约占Bagrid渔获量的63％，偏爱浅沙质河床带粉质砂质底质。它的总长度为14.6厘米，重量为32.0克。重量相对于长度的增长是等距的，条件因子的范围为1.0-2.9。它随鱼的个体大小而增加，而与性别无关，并且在雨季高于旱季。 C. auratus主要以昆虫，鱼类和水生植物为食。甲壳类和藻类仅占饮食的一小部分。它实际上是一种夜间喂食器，其进食习性没有明显的质量变化。繁殖发生在5月至7月之间，卵数估计在260至620之间。性腺体指数（GSI）值在2.69至19.68之间。 （

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