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NY study on effects of stocking browns in water w/ brookies

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Posted on: 2/25 7:38


Re: NY study on effects of stocking browns in water w/ brookies

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Interesting article.

Posted on: 2/25 10:24


Re: NY study on effects of stocking browns in water w/ brookies

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well researched imho.

Posted on: 2/26 6:18


Re: NY study on effects of stocking browns in water w/ brookies

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That was interesting, but I don't get them saying "causes of the decline of Brook Trout in their native range are not clear"? Not clear??

Posted on: 2/26 8:20
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Re: NY study on effects of stocking browns in water w/ brookies

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"Intensive annual stocking of Brown Trout could eliminate resident Brook Trout in less than a decade."

Posted on: 3/1 9:34


Re: NY study on effects of stocking browns in water w/ brookies

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I really don't get it. "The abstract of the report states: Intensive annual stocking of Brown Trout could eliminate resident Brook Trout in less than a decade. Ecological differences, harvest behavior, and other habitat changes can exacerbate Brook Trout losses. Custom stocking scenarios with Brown Trout introductions at relatively low proportions of resident Brook Trout populations may be able to sustain healthy populations of both species within their present range." Note the key word "may" in the last sentence. When I was still working we called these 'weasel' words.

How can the premise of this study be so. There are many other studies showing not only the opposite but give the reasons why: Brook trout are 3 times more likely to be harvested than brown trout in waters where the two species are living in sympatry in similar numbers (Cooper); brown trout (because they tend to be a little bigger than brook trout) can displace brook trout from critical stream positions (Fausch & White); brown trout can carry diseases (Saprolegnia) to which they are pretty much immune, but brook trout and other salmonids are very susceptible (DeWald & Wilzbach); and many others.

I fish for brown trout lot and have a lot of respect for them. Brown trout, like brook trout, are an excellent sport fish. I'm an immigrant too and my ancestors came from the same places. Their introduction could have been much worse (think snakeheads and carp). Catching big browns in the Little J and Spring Creek is a fine experience that I enjoy immensely. But they have taken over and dominate all the waters where brook trout once averaged 9 inches; frequently reached a foot; and occasionally 20 inches - the big freestones and limestone stream of PA. "Although we have not lost the brook trout as a species, we have lost a lot." (Charles Gowan).

This is just another attempt to justify the widespread policy of stocking brown trout over brook trout and other native salmonids.

Posted on: 3/1 11:11


Re: NY study on effects of stocking browns in water w/ brookies

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"New York State contains a large portion of the Brook Trout's native range, where both species are maintained by stocking and other management actions."

The brook trout populations are "maintained" by stocking? Really?

Posted on: 3/1 13:00


Re: NY study on effects of stocking browns in water w/ brookies

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KenU: "This is just another attempt to justify the widespread policy of stocking brown trout over brook trout and other native salmonids."

uh sure, that's what USGS scientists are doing

Posted on: 3/1 13:17

Edited by k-bob on 2014/3/1 13:34:36


Re: NY study on effects of stocking browns in water w/ brookies

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The statement: "Custom stocking scenarios with Brown Trout introductions at relatively low proportions of resident Brook Trout populations may be able to sustain healthy populations of both species within their present range" was why I said that the report could be used to justify the practice of stocking brown trout over brook trout populations.

I can't imagine how that conclusion could be reached considering the results that are outlined in the rest of the abstract.

Posted on: 3/1 17:28


Re: NY study on effects of stocking browns in water w/ brookies

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apparently those are the results: the worst brown trout stocking practices could severely impact wild brookies, but the best brown trout stocking practices may be consistent with brookie conservation. that's how I read them anyhow. don't recall all details but stocking that is too frequent, or intense, or involves too much of a stream length, and attracts much harvest increases impact. struck me as a careful study but some of the methods were over my head.

I had a way to read it online, but won't try to repeat a long study. if you want the full study a university library near you may uh stock it :)

Posted on: 3/1 17:35

Edited by k-bob on 2014/3/1 17:54:38


Re: NY study on effects of stocking browns in water w/ brookies

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Quote:

KenU wrote:
The statement: "Custom stocking scenarios with Brown Trout introductions at relatively low proportions of resident Brook Trout populations may be able to sustain healthy populations of both species within their present range"


As I pointed out in another post, they also said this, earlier in the abstract:

"New York State contains a large portion of the Brook Trout's native range, where both species are maintained by stocking and other management actions."

In both of these statements they are saying that brook trout and brown trout populations are "sustained/maintained" by stocking.

Does anyone reading this believe that they are? If stocking ended, would brook trout and brown trout populations disappear?


Posted on: 3/1 17:59


Re: NY study on effects of stocking browns in water w/ brookies

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better to read this study than make too much of one ambiguous abstract sentence? You probably can find the studying actually read it if you want to

Posted on: 3/1 18:22


Re: NY study on effects of stocking browns in water w/ brookies

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Here's a news release put out by the USGS about the same study:

http://www.usgs.gov/newsroom/article.asp?ID=3754&from=rss

"There is great potential for brown trout stocking to reduce native brook trout populations," said James McKenna, USGS scientist and lead author of the study. "But brown trout aren’t necessarily causing the current brook trout declines, and managers may be able to develop sustainable scenarios to support both fisheries."


Posted on: 3/2 12:44


Re: NY study on effects of stocking browns in water w/ brookies

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right, like the article, the press release notes the problem with repeated disproportionate stocking.

Posted on: 3/2 13:51


Re: NY study on effects of stocking browns in water w/ brookies

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Troutbert has it right. Stocking hatchery-raised trout in order to maintain a population is factitious. Stocked trout have been adapted to hatchery life for many generations now and have lost many of the characteristics needed for survival in the wild. Wildness is the first trait to be lost when any animal is brought into captivity. This is especially true of hatchery-raised (i.e., domesticated) brook trout. They are dumb as a box of rocks.

Posted on: 3/2 14:12



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