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首页> 美国政府科技报告 >Evaluation of Planting Native Hatchery Coho Fry into Streams Containing Wild Coho Fry
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Evaluation of Planting Native Hatchery Coho Fry into Streams Containing Wild Coho Fry

机译：将本地孵化场Coho鱼苗种植到含有野生Coho鱼苗的溪流中的评价

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We conducted in initial investigation of the effects of planting hatchery reared wild coho fry into streams containing resident wild fry through the summer of 1989. The ten small, north coastal Washington streams all contained naturally occurring wild fry at varying densities. Hatchery-reared wild fry were planted into eight of the streams. Hatchery-reared fry were consistently larger than resident fry when planted but growth rates were not significantly different through the summer. Although there were some violations of basic study design assumptions, presense of hatchery-reared fry apparently did not cause obvious declines in either hatchery or resident fry. There were no dramatic differences in fry survival betwwen hatchery and resident fry in test streams nor between resident fry in test streams and control streams. We recommend these investigations continue with 1) every test stream having a control stream, 2) varying stocking densities, 3) varying sizes fish at stocking, 4) evaluation of the effects of up- and downstream migration, 5) further consideration of the dissimilar effects of electrofishing on fry of various sizes, and 6) evaluations of relative success of smolts and adults on the same streams.

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