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Originally Posted by FlyTheory

It has to do with the taxonomical similarities, which also means expression of keratin uptake will be different per taxonomic groups. So to generalize, pike and salmonids are all part of the same designated superorder, Protacanthoperygii. Perch and walleye are in the super order Acanthopterygii. This may not seem like a huge difference, but the evolutionary history and expression of genes (such as keratin fixation in muscle) can be as broad as superorder. Furthermore, the relations between pike and salmonids are relatively close, as they are both of the same order Salmoniformes. I dont know much about the genetic expression and keratin fixation in the white muscle, but I hope I gave you a decent explanation.

vocab flexin