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首页> 外文会议>International symposium on Bering-Aleutian salmon international surveys >A Comparison of the Diets of Hatchery and Wild Coho Salmon (Oncorhynchus kisutch) in the Strait of Georgia from 1997-2007
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A Comparison of the Diets of Hatchery and Wild Coho Salmon (Oncorhynchus kisutch) in the Strait of Georgia from 1997-2007

机译：1997 - 2007年格鲁吉亚海峡中孵化场和野生康汉鲑鱼（牛蒡子）饮食的比较

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Wild and hatchery-reared coho salmon (Oncorhynchus kisutch) have now co-existed in the Strait of Georgia for over 30 years, and have exhibited considerable variation in marine survival rates. This study is the first to compare diets of juvenile hatchery and wild coho salmon during the critical early marine period of this species. From 1997-2007, over 10,000 stomachs from juvenile coho salmon captured in the Strait of Georgia were examined. Diets in July were dominated by decapods (primarily crab megalops) and fish (primarily herring). In September, euphausiids and amphipods (primarily hyperiids) dominated. The variability between hatchery and wild coho salmon diet was larger in September than in July. Prey volume, stomach fullness and fork length were significantly correlated between hatchery and wild coho salmon in the July and September surveys. While coho salmon captured in September surveys had significantly higher percentages of empty stomachs than those from July, there were no significant differences in the percentage of empty stomachs between hatchery and wild coho salmon in either survey. Shifts in diet composition occurred both annually and seasonally, but the trends for both groups of coho salmon were the same. Thus, we conclude there were no significant differences observed between hatchery and wild coho salmon in either appetite (volume of prey in the stomach) or in diet (composition of stomach contents) in either July or September surveys from 1997-2007 in the Strait of Georgia, British Columbia, Canada.
机译：野生和孵化场饲养的Coho Salmon（Oncorhynchus Kisutch）现已在格鲁吉亚海峡有超过30年中共存，并且在海洋生存率方面表现出相当大的变化。本研究是第一个在本物种的批判性早期海洋时期期间比较少年孵化场和野生Coho鲑鱼的饮食。从1997 - 2007年开始，研究了在格鲁吉亚海峡捕获的少年富士鲑鱼超过10,000胃。 7月的饮食由脱像饼（主要是蟹巨头）和鱼（主要是鲱鱼）主导。 9月，Euphausiids和Amphipods（主要是HyperIids）主导。孵化场和野生Coho鲑鱼饮食之间的可变性比7月更大。在7月和9月调查中，孵化场和野生Coho三文鱼之间的捕食量，胃丰富和叉长。虽然九月调查捕获的Coho Salmon比7月份的空腹百分比明显高，但在任何调查中，孵化场和野生Coho鲑鱼之间空腹百分比没有显着差异。饮食成分的转变每年和季节性地发生，但两组均鲑鱼的趋势都是一样的。因此，我们得出在1997 - 2007年7月或9月调查中，孵化场和胃野生叔鲑鱼（胃中的猎物体积）或饮食（胃内容的牺牲品）之间没有显着差异，从1997 - 2007年在海峡中格鲁吉亚，不列颠哥伦比亚省，加拿大。

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