Pacific Salmon Ecology and Conservation Laboratory, Department of Forest and Conservation Sciences, University of British Columbia, Vancouver, B.C, V6T 1Z4, Canada.
J Fish Biol. 2015 Jan;86(1):392-401. doi: 10.1111/jfb.12567. Epub 2014 Dec 12.
Stomach contents were collected and analysed from 22 bull trout Salvelinus confluentus at the edge of the Chilko Lake and Chilko River in British Columbia, Canada, during spring outmigration of sockeye salmon Oncorhynchus nerka smolts. Twenty of the 22 (>90%) stomachs contained prey items, virtually all identifiable prey items were outmigrant O. nerka smolts and stomach contents represented a large portion (0·0-12·6%) of estimated S. confluentus mass. The results demonstrate nearly exclusive and intense feeding by S. confluentus on outmigrant smolts, and support recent telemetry observations of high disappearance rates of O. nerka smolts leaving large natural lake systems prior to entering high-order unregulated river systems.
在加拿大不列颠哥伦比亚省奇尔科湖和奇尔科河的鲑鱼洄游出口处，对 22 条刚孵化的红大麻哈鱼（Oncorhynchus nerka）幼鱼进行了抽样，并收集和分析了它们的胃内容物。在这 22 条鱼中，有 20 条（>90%）的胃中含有食物，几乎所有可识别的食物都是洄游的红大麻哈鱼幼鱼，而这些鱼的胃内容物占刚孵化的大麻哈鱼（Salvelinus confluentus）体重的很大一部分（0·0-12·6%）。研究结果表明，刚孵化的大麻哈鱼几乎完全以洄游的大麻哈鱼幼鱼为食，这与最近的遥感观测结果一致，即大量的红大麻哈鱼幼鱼在进入不受监管的高等级河流系统之前，从大型天然湖泊系统中消失。
