Rainbow Trout in Argentina

Questions about Freshwater Fishing

Rainbow Trout in Argentina

Postby Bob Daly » Tue Nov 03, 2015 1:09 pm

Hi Larry: During my recent trip to Jurassic Lake Lodge on Lago Strobel in Argentina, I caught many extremely large rainbows which looked slightly different. The rainbows were spawning which probably accounted for this. The question I have is if both rainbow and steelhead were put into Lago Strobel could one tell them apart?
Thanks doradokiller 8)
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Re: Rainbow Trout in Argentina

Postby dahlberg » Tue Nov 03, 2015 5:56 pm

likely not, imo. as you know, the steelhead are simply rainbows that migrate from riverine to non-riverine environments as part of their spawning deal. when you say one is the other in their travesl is a good question. obviously there are specific strains of rainbows like donaldsons and Kamloops that are a bit out of the norm, but you pose an interesting question from a purely biological definition standpoint.
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Re: Rainbow Trout in Argentina

Postby aka anglinarcher » Tue Nov 03, 2015 7:51 pm

If I may interject some.

Larry is correct about various strains.

Some are caused by isolation from other strains, some by man caused selection of traits, but all are steelhead that never made it to the ocean in time. If they migrate too late and don't make it in time (normally about a year) then their kidneys can't filter out the excess salt and they die. If they make it, they can and will migrate from salt to fresh to spawn several times. Redbands are closely related to Rainbows, even looking like them, but are more closely related to the Cutthroat trout. Cutthroat trout are related to Rainbows and Steelhead, and some Cutties do have a salt water cycle as well. All this is learned while living in the Pacific Northwest where trout, salmon and steelhead are king.

Steelhead in the Great Lakes are NO LONGER STEELHEAD. No salt, no steelhead! But, did you know that if their young can make it to the salt, like any Rainbow strain, they will be Steelhead again? YEP. :idea:

There are genetic test, electrophoresis if I recall the spelling, that can identify the strains and can tell one strain of fish from another, so yes, you could tell from the "Steelhead" and the "Rainbow Trout", but, again, the only difference is the source of the strain.

Almost all Washington State "Rainbows" can trace back to some Steelhead strain. The state has also found that most Steelhead "hens" seem to be fertilized by the resident Rainbow "bucks", not the Steelhead strain in the river. A movement is taking place to eradicate rainbow residents to make the Steelhead hens wait for the Steelhead bucks.

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