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Coldwater Fly Fishing Trout, Salmon, Steelhead, etc...

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Old 04-27-2014, 11:03 AM
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Default Re: What is up with this trout?

Thanks guys. I'll contact the Utah Fish and Game and see if I can find out. I'd like to know if I should have harvested the fish to get him out of the gene pool.
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Old 04-27-2014, 08:59 PM
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Default Re: What is up with this trout?

Some type of chemical exposure?
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Old 04-27-2014, 09:00 PM
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Default Re: What is up with this trout?

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Originally Posted by stenacron View Post
Seen this a lot on hatchery fish and in C&R areas... pretty sure its the fishes skin reaction to their slime coat being removed (poor handling, nylon nets, rolling around on the bank, etc.).
I've seen similar things on hatchery trout, too. Not quite as big, though. Blotches the size of a half dollar or quarter.

Can't tell you why, but I'd always assumed just a mutation.
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Old 04-27-2014, 09:50 PM
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Default Re: What is up with this trout?

Quote:
Originally Posted by stenacron View Post
Seen this a lot on hatchery fish and in C&R areas... pretty sure its the fishes skin reaction to their slime coat being removed (poor handling, nylon nets, rolling around on the bank, etc.).
I have a hard time believing this fish had slime removed in two straight lines bisecting it along two axes.
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Old 04-27-2014, 11:46 PM
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Default Re: What is up with this trout?

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Originally Posted by Poke 'Em View Post
I have a hard time believing this fish had slime removed in two straight lines bisecting it along two axes.
Don't think it quite works like that. It only takes a small area to be removed, but the blackened skin reaction spreads out from there. I've seen it on quite a few fish and it always looks strangely squared off like that.
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Old 04-28-2014, 07:21 AM
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Default Re: What is up with this trout?

I am guessing it has do with where that fish predominately hangs out and there may be a uv or light and shade issue at play.
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Old 04-28-2014, 07:33 AM
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Default Re: What is up with this trout?

hyperpigmented melanosis

A skin reaction thought to be a reaction to handling, stress, or other factors.

It is kind of a "grey" area as to the causes. Maybe DWR will have some more definite answers for the conditions that cause it.
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Old 04-28-2014, 07:55 AM
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Default Re: What is up with this trout?

You guys are all wrong...

He missed a spot with the sunscreen before going to the amusement park.
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Old 04-28-2014, 08:07 AM
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Default Re: What is up with this trout?

I have seen when fish spend their life on the edge of a shadow one half is a darker color to better blend into the environment. This is weird though considering line of color is vertical.
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Old 04-28-2014, 12:07 PM
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Default Re: What is up with this trout?

A muscle or nervous issue may explain the pattern- fish muscle tissue is arranged in relatively straight lines (think the "flakes" of a fish fillet), and I know some fish wind up with dark bands after being electrofished by fish and game agencies. But I'm just spitballin'
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