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首页> 外文期刊>Belgian Journal of Zoology >Feeding ecology of various age-classes of brown trout in River Nera, Central Italy
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Feeding ecology of various age-classes of brown trout in River Nera, Central Italy

机译：意大利中部近河地区不同年龄段褐鳟的摄食生态

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摘要

We studied the composition of the stomach contents of brown trout (Salmo trutta trutta) of different ages in the river Nera, Central Italy. Each age class of fish consumed significantly different prey taxa. Plecopteran nymphs tended to increase in percentage as the individuals became older, while ephemeropteran nymphs were always present in high percentage. Trichopteran larvae were the most abundant prey in trout younger than 2+, while their percentage decreased considerably in older fish. The remaining aquatic prey (except dipteran larvae) were scarce and, finally, terrestrial prey were consumed more by older individuals. Vanderploeg & Scavia's index shows a high preference for species of Trichoptera by trout younger than 3+, plecopteran species by those older than three years, and a general negative preference for species of Ephemeroptera by all age classes.
机译：我们在意大利中部的内拉河研究了不同年龄的褐鳟（Salmo trutta trutta）的胃内容物组成。每种年龄级别的鱼都消耗明显不同的猎物类群。随着个体年龄的增长，鳞翅目若虫的比例趋于增加，而表翅翅目若虫总是以较高的百分比存在。 rich鳞幼虫是2岁以上鳟鱼中最丰富的猎物，而它们的百分比在年长的鱼类中显着下降。其余的水生猎物（二倍体幼虫除外）很稀少，最后，陆生猎物被年纪较大的人所消耗。 Vanderploeg＆Scavia的指数显示3岁以上的鳟鱼对Trichoptera物种的偏爱较高，三岁以上的鳟鱼对Popteroptera的物种偏爱，而所有年龄段的人都对Ephemeroptera的物种普遍偏爱。

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