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首页> 外文期刊>International journal of ecohydrology and hydrobiology >Spawning aggregation and segregation of Labeobarbus spp. (Pisces: Cyprinidae) in the Megech and Dirma River mouths, Lake Tana, Ethiopia
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Spawning aggregation and segregation of Labeobarbus spp. (Pisces: Cyprinidae) in the Megech and Dirma River mouths, Lake Tana, Ethiopia

机译： labeobarbus spp的产卵聚集和分离。 （双鱼座：Cyprinidae）在Megech和Dirma河口，塔纳湖，埃塞俄比亚

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AbstractSpawning aggregation and segregation ofLabeobarbusspecies congregating at the mouths of Megech and Dirma Rivers were studied using catch data collected from December 2003 to November 2004. Fish were collected monthly from November to June and twice in July. However, during the main rainy season (August to October 2004), samples were collected weekly at both river mouths. Polyfilament gillnets with mesh sizes: 6, 8, 10 and 12cm were set overnight. A total of 4280Labeobarbusspecimens were collected. SixLabeobarbusspecies (L. intermedius,L. megastoma,L. tsanensis,L. truttiformis,L. brevicephalusandL. surkis) formed spawning aggregations in the river mouths during the peak of the rainy season (August to October). Although there was overlap of spawning aggregations between these sixLabeobarbusspecies weekly catch data indicated temporal segregation among all species, exceptL. intermedius. Four species (L. intermedius,L. megastoma,L. truttiformisandL. tsanensis) were significantly higher in abundance at Megech River than at Dirma River during the peak aggregation months.Labeobarbus surkis, never reported in other previous studies, was found to aggregate at both river mouths. However, three species (L. acutirostris,L. macrophtalmusandL. platydorsus) formed spawning aggregation in other tributaries were rare in the present study. Closing commercial gillnet fishing in both river mouths during the peak aggregation months (August to October) is highly recommended to conserve the already declining endemicLabeobarbusspecies flock of Lake Tana. Dam constructions for irrigation in Megech River upstream will impede spawning migration ofLabeobarbusspecies.]]>
机译：<！[cdata [ 抽象 labeobarbus 在梅吉和帝国河口中聚集的斜体>物种的射击从2003年12月到2004年11月收集的捕获数据。每月从11月到6月和7月两次收集鱼。然而，在主要的雨季（2004年8月）期间，样品在两条河口每周收集。具有网眼尺寸的多丝羽毛：6,8,10和12cm，在一夜。共有4280个迷住地区：斜体>标本被收集。六 labeobarbus 物种（ l。中间uIm ， l。megastoma ， L. Tsanensis ， l。truttiformis ， l。brevicephalus 和 l。surkis ）在雨季高峰期（八月至十月）期间在河口中形成产卵聚集。虽然这六个 labeobarbus之间存在产卵聚集在斜体和labeobarbus：斜体>物种每周捕获数据之间，但除 l之外，所有物种之间的时间隔离。介质。四种物种（ l。中期， l。megastoma ， l。truttiformis 和 l。Tsanensis labeobarbus surkis ，在其他以前从未报告过研究，被发现在两条河口汇集。然而，三种物种（ l。Acurirostris ， l。macrophtalmus 和 l。platydorsus ）在目前的研究中，其他支流中的产卵聚集是罕见的。在峰值聚合月份（八月至十月）期间，依赖于河口的商业羽毛钓鱼，强烈建议将已经下降的流行病人 labeobarbus 塔纳湖群。 Megech River灌溉的水坝建设将妨碍 labeobarbus 物种的产卵迁移。 ] ]

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