Weekly changes in prey availability for and the selective feeding of sea trout (Salmo trutta L.) larvae stocked in small forest streams

Q3 Agricultural and Biological Sciences
J. Domagała, R. Czerniawski, T. Krępski
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引用次数: 0

Abstract

Abstract This study examined the availability of food and its selection by sea trout Salmo trutta L. fry in the first four weeks of life after yolk sac resorption. The food base and stomach contents of sea trout fry after release in the wild were determined. The study was performed in two small forest streams from April 25 to May 23, 2014. Macro-zoobenthos that comprised the food base for the fry were collected from the streams weekly using a bottom scraper. On the same day, the fry were captured with electrofishing gear. Analysis of the width of the benthic organisms in the food base and in the fish stomachs indicated the prey size range that the fish were feeding on. Further, the study showed that all food items found in both streams during the study weeks were also represented in the intensity of the fish: Cyclopoida, the larvae of Baetidae, Simuliidae and Nemouridae.
储存在小森林溪流中的海鳟(Salmo trutta L.)幼虫的猎物可得性和选择性摄食的每周变化
摘要本试验研究了海鳟卵黄囊吸收后4周内饵料的可得性及对饵料的选择。测定了放生后的海鳟鱼苗的食基和胃内容物。研究于2014年4月25日至5月23日在两个小森林溪流中进行。大型底栖动物是构成鱼苗的食物基础,每周使用刮底器从溪流中收集。同日,用电渔具捕获了鱼苗。对食物基和鱼胃中底栖生物宽度的分析表明了鱼所捕食的猎物的大小范围。此外,研究表明,在研究周内,在两条河流中发现的所有食物也代表了鱼的强度:Cyclopoida, Baetidae, Simuliidae和Nemouridae的幼虫。
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来源期刊
Archives of Polish Fisheries
Archives of Polish Fisheries Agricultural and Biological Sciences-Aquatic Science
CiteScore
1.40
自引率
0.00%
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0
审稿时长
20 weeks
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