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  • Killing Kings

    https://www.ktuu.com/content/news/Th...510406531.html

    Small sample indicates massive predation of adult chinook in Bristol Bay: Of the 43 tags the researchers put on salmon, they received data from 35 of them. Nineteen of those 35 indicate they were eaten by predators. The study is too small to show whether this is a primary impact to salmon numbers but Seitz says it gives researchers more targeted areas to study.

  • #2
    Originally posted by extrema View Post
    https://www.ktuu.com/content/news/Th...510406531.html

    Small sample indicates massive predation of adult chinook in Bristol Bay: Of the 43 tags the researchers put on salmon, they received data from 35 of them. Nineteen of those 35 indicate they were eaten by predators. The study is too small to show whether this is a primary impact to salmon numbers but Seitz says it gives researchers more targeted areas to study.
    Could be a tagging effect. I have observed tagged fish being selected for as their behavior is impacted and they stand out. Not saying this happened but one should consider it.

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    • #3
      The effects of tagging on the behavior and survival of salmon is a constant concern. Both coded wire tags and PIT tags are believed to adversely affect survival, to varying degrees.

      The type of tag used in this study may be large and cumbersome, even for adult salmon. That is why these types of tags should not be used to estimate stock survival. These tags are good at providing information on migration routes, depth, daily/seasonal movements, and temperature preferences. But expanding this to survival of a population at-large should be avoided since the tag can influence both fish behavior and their ability to avoid predation.

      To that point, sharks are known to pick up electromagnetic frequencies. As such, they may be able to detect the tag used in this study. That makes the adult salmon much more susceptible to predation.

      Nerka is making the same point. In fewer words.......

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      • #4
        Give those two guys a GOLD star!
        "Let every angler who loves to fish think what it would mean to him to find the fish were gone." Zane Grey
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        The KeenEye MD

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