Is This a Cross Breed??

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carl otto
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Is This a Cross Breed??

#1

Post by carl otto »

Caught this "Brown trout" yesterday, but it was very strange in appearance. Note the prominent halos around both the red and dark spots, plus the one white fin edge. Any fishery biologists out there to comment. The fish just sparkled in this look. Sorry for the poor quality of the shot.

Carl


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john8
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Re: Is This a Cross Breed??

#2

Post by john8 »

Looks like a normal brown trout to me, they can vary in looks from location, etc. The brown trout I catch in Iceland which are all wild fish in some of the rivers and lakes have no red spots while in other locations they have red spots. Some are very silvery looking almost like a sea trout even though they are not and others more yellow or brown in color. Not sure if some adapt or evolve over the years to help them blend in to the types of waters they are located.

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GerardH
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Re: Is This a Cross Breed??

#3

Post by GerardH »

Standard issue trutta, albeit a beautiful fish. In Wisconsin anyway, I know the original hatchery lineages go back to either German or the Loch Leven strains. The German strains tend to have more red spots and the Scottish fish generally have less red spots or lack them entirely. With the interbreeding that has occurred the past 140 years or whatever, you tend to get a mixed bag.

This is a very generalized overview, there have been many strains from the British Isles and the European continent that may have influence on what we have swimming in our waters.

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Hellmtflies
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Re: Is This a Cross Breed??

#4

Post by Hellmtflies »

Yea, as above, she looks to be a true Salmo Trutta. Whether Von Behr or Loch Leven is unknown.

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quashnet
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Re: Is This a Cross Breed??

#5

Post by quashnet »

From the fisheries biology perspective, here is perhaps more than you wanted to know about color plasticity in introduced brown trout populations: Westley PAH, Stanley R, Fleming IA (2013) Experimental Tests for Heritable Morphological Color Plasticity in Non-Native Brown Trout (Salmo trutta) Populations. PLoS ONE 8(11): e80401. https://doi.org/10.1371/journal.pone.0080401 - According to the authors, their experiments show that genetics apparently plays less of a role than adaptive coloration changes under neuronal and hormonal control by the individual fish.
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