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SingleShot
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PostThu Sep 28, 2017 12:54 pm 
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A really skinny EB from Rock Lake. A fishery program, in alpine lakes, utilizing an apex predator would turn fish like this into part of the food chain.




MAKE FISHING GREAT AGAIN

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SingleShot
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PostThu Sep 28, 2017 8:47 pm 
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MAKE FISHING GREAT AGAIN    Skinny Fish

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Leafguy
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PostThu Sep 28, 2017 9:01 pm 
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SingleShot wrote:
MAKE FISHING GREAT AGAIN

If your fishing isn't great, explore!!! smile.gif
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PostFri Sep 29, 2017 7:55 am 
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Triploid versions of these predatory fish you speak of?   Wouldn't that solve the problem, offer some hefty fishing and not cause long term issues/damage?
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SingleShot
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PostSat Sep 30, 2017 3:17 pm 
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These fish were caught in Merritt Lake. The otoliths were sent to the WDFW for aging and there are some interesting ages.   Age data

Trout, generally, sexually mature around 12 - 14 inches or, generally after reaching age 4.

In the list you will note some fish with a TC. It stands for being previously caught and having its tail clipped. We TC 115 fish in one day as part of this project.

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iron
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PostThu Oct 05, 2017 3:55 pm 
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i don't fish, but i cannot possibly imagine the logic of poisoning a body of water. i don't care what's in it.

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PostThu Oct 05, 2017 4:26 pm 
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I may be wrong, but I thought rotenone was used because it is a natural occurring substance that breaks down soon after it is used.
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PostThu Oct 05, 2017 6:41 pm 
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If the lake has no outlet then rotenone is used on a per acre amount. If there is an outlet then a calculated amount of potassium permanganate is applied to detoxify the poison. Too much potassium is even more deadly than the rotenone and will kill fish miles downstream.

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DIYSteve
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PostFri Oct 06, 2017 10:09 am 
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The poisoning in some NCNP lakes seemed to have turned out fine. The reproducing skinny fish are gone and the salamanders have repopulated. Examples are Sourdough, Nert and Lower Blum.
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iron
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PostFri Oct 06, 2017 10:11 am 
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DIYSteve wrote:
The poisoning in some NCNP lakes seemed to have turned out fine. The reproducing skinny fish are gone and the salamanders have repopulated. Examples are Sourdough, Nert and Lower Blum.

but would you drink the water, unfiltered?

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PostFri Oct 06, 2017 11:05 am 
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Several years ago Blum was illegally planted with brown trout.

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DIYSteve
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PostMon Oct 09, 2017 10:46 am 
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iron wrote:
but would you drink the water, unfiltered?

No, because I always filter water from lakes, no mater how remote. Re streams fed by a rotenone-treated lake, I'm not concerned for several reasons: Rotenone suspended in water in the concentrations used for fish poisoning is not toxic to humans. Even in much higher concentrations in water, it's at most mildly toxic to humans, at worst causing vomiting but no long term problems. After a few days, rotenone oxides to rotenolone, which is an order of magnitude less toxic. We often breathe, drink and eat more things toxic without knowing it.
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Tom
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PostMon Oct 09, 2017 11:58 am 
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DIYSteve wrote:
The poisoning in some NCNP lakes seemed to have turned out fine. The reproducing skinny fish are gone and the salamanders have repopulated. Examples are Sourdough, Nert and Lower Blum.

I assume you meant Lower Berdeen because Nert didn't have fish only salamanders when I fished it ~10 years ago.
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DIYSteve
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PostMon Oct 09, 2017 7:06 pm 
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Tom wrote:
I assume you meant Lower Berdeen because Nert didn't have fish only salamanders when I fished it ~10 years ago.

No, I meant Nert, which I assumed had fish at one time because we saw an old tin milk jug up next to it, the kind that was used to transport fry years ago. I cannot imagine another reason for someone to have schlepped up there with a big tin milk jug. The last time I was there (of 3 times) we saw lots of salamanders.
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PostTue Oct 10, 2017 12:59 pm 
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There are several piscicides available besides rotenone. All effectively kill fish but the approval process, for lakes on Forest Service lands, require WDFW/USFS cooperation which has been elusive.

Another option is apex predators. Brown trout, tiger trout, northern pike minnow, mergansers, cormorants, and the ugliest fish in the world, the tiger musky. All eat fish but the birds probably consume more. Most hi lake anglers would prefer a salmonid like this fish an almost 8 lb. brown trout from Rock Lake that gorged itself on stunted brook trout.

At present, the only stunted lake project I know of is at Anderson Lake, in Lewis County. Its been ongoing for 8 - 10 years and reports are sketchy about its success.

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