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The potential for natural reproduction of chinook salmon in the Chippewa River, Isabella County, Michigan.

机译：密歇根州伊莎贝拉县奇佩瓦河奇努克鲑鱼自然繁殖的潜力。

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摘要

During 1992-1993, the Chippewa River in Isabella County, Michigan was evaluated as a possible site for natural reproduction by fall spawning chinook salmon.; A survey of 37 km of the river identified five chinook salmon redds. Survival of incubating salmon during embryonic and alevin life stages was determined by observing development of eggs planted in artificial redds located adjacent to natural redds. Parameters investigated were substrate composition, sedimentation, temperature, dissolved oxygen, and turbidity.; Results indicated that embryos developed well at all sites until hatch, when a significant reduction in alevin survival was observed in artificial redds downstream from an agriculturally degraded tributary. Alevin survival correlated negatively with increased sediments less than 0.125 mm in diameter. Potential spawning sites upstream from that tributary were degraded by algal growth and anoxic sediments and thought to be selectively avoided by spawning salmon. No evidence of successful natural reproduction was observed.
机译：在1992-1993年期间，密歇根州伊莎贝拉县的奇珀瓦河被秋天产卵的奇努克鲑鱼评估为自然繁殖的可能场所。对这条河的37公里进行了一项调查，发现有五只奇努克鲑鱼变红。鲑鱼在胚胎和鱼精蛋白生命阶段的存活率是通过观察种植在与自然红豆相邻的人工红豆中的卵的发育来确定的。研究的参数是基质组成，沉淀，温度，溶解氧和浊度。结果表明，在孵化之前，所有部位的胚胎发育良好，直到在农业降解的支流下游的人工人工繁殖中观察到的鱼精蛋白存活率显着降低。 Alevin存活与直径小于0.125 mm的沉积物增加呈负相关。藻类的生长和缺氧的沉积物使该支流上游的潜在产卵地点退化，并认为通过产卵鲑鱼可以有选择地避免。没有观察到成功自然繁殖的证据。

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  • 作者

    Hamlin, Dennis Jay.;

  • 作者单位

    Central Michigan University.;

  • 授予单位 Central Michigan University.;
  • 学科 Biology General.; Agriculture Fisheries and Aquaculture.
  • 学位 M.S.
  • 年度 1993
  • 页码 80 p.
  • 总页数 80
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 普通生物学;水产、渔业;
  • 关键词

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