Are there mixed-breed fishes or birds?

Are there mixed-breed fishes or birds?
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Answer :

answer:Seems to me that “races” in birds and fish would be the equivalent of “breeds” in dogs, no? One example that comes to mind in the fish world is the races of golden and rainbow trout native to the American West. Here’s an article that demonstrates the relationship. They are classified as different species, but many consider the golden to be a sub-species of the rainbow. They can interbreed.
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