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View Diary: We Could Have Stopped It 100 Times, And We'll Fail Again (243 comments)

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  •  Question: (2+ / 0-)
    Recommended by:
    Loonesta, Muskegon Critic

    Have there been or are there ecosystem effects in the Great Lakes from other non-native fish like brown trout?  I know they've been there since the 1880's, but I have seen stuff talking about how they are bad for other similar salminoids and/or eat the food of many other species, thus having a detrimental effect.  I've also read opinions that dispute this.

    I'd appreciate some viewpoints on this.

    Still using my fake name...

    by Rex Freedom on Tue Apr 27, 2010 at 03:47:38 PM PDT

    •  Monterey Bay Aquarium report (3+ / 0-)
      Recommended by:
      Fabian, Rex Freedom, ms badger

      Monterey Bay Aquarium's Seafood Watch program has a report on Great Lakes fishing.  Here's what it had to say wrt to brown trout and other introduced predator fish:

      Introduced predators – Top predator fish have been deliberately stocked in the Great Lakes since the end of the 19th century, when Chinook salmon (Oncorhynchus tshawytscha) and brown trout (Salmo trutta) were introduced to provide greater fishing opportunities. In the 20th century, further predator stocking of species like Coho salmon(Oncorhynchus kisutch) was initiated in order to control expanding populations of rainbow smelt and alewife. Since then, these species have grown to support lucrative sport fisheries. However, their presence in the Great Lakes is somewhat controversial, as they compete with native predators for food and there is concern that continued stocking of these species is impeding the recovery of lake trout stocks (Mills et al. 1994). Furthermore, a decline in abundance of both alewife and rainbow smelt in recent years indicates that the Great Lakes cannot support the high predator density that is resulting from predator stocking coupled with some recovery of native predator populations, such as walleye, and the substantial natural reproduction of introduced Chinook salmon now occurring. It is generally agreed that predator stocking will have to be substantially reduced, if not eliminated, in order to bring back a self-sustaining and native Great Lakes fish community (Kitchell et al. 2000).

      Procrastination: Hard work often pays off after time, but laziness always pays off now.

      by Linnaeus on Tue Apr 27, 2010 at 04:35:31 PM PDT

      [ Parent ]

    •  There are definitely invasives (6+ / 0-)

      that have been welcomed...even invited. One, for example, is the brown trout. Same with the coho and the chinook salmon. All three are intentionally stocked in the Great Lakes by the fishery commission.

      Coho and Chinook were introduced as a way to control alewife populations. Brown Trout was introduced, on purpose, exclusively for eating purposes in the 1800s.

      Some invasives don't compete in the Great Lakes ecosystem...they just occupy a new ecological niche. My understanding of the Brown Trout is that this is the case with them...they live in places where other trout do not. I'm not sure about their effects on newts, but it wouldn't surprise me that there were adverse effects.

      These days, though, there's little use in talking about what SHOULD or SHOULDN'T be in the Great Lakes. The system is wonked up beyond getting back to the "original" balance.  Now it's a question of What Do We Want in the Great Lakes?

      Month by month. (Hope to see you on Twitter)

      by Muskegon Critic on Tue Apr 27, 2010 at 05:46:21 PM PDT

      [ Parent ]

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