What rare, recessive genetic trait, seen in species like the Blue Catfish, causes overall pale coloration but retains pigmented eyes?
Answer
Leucism
Variation within catfish species can arise through simple, recessive genetic traits affecting pigmentation, distinct from the speciation that separates genera. Leucism is one such rare trait observed in catfish, including the Blue Catfish. This condition results in an overall pale coloration of the fish's body. Crucially, leucism is differentiated from albinism by the characteristics of the eyes; in leucistic individuals, the eyes retain their normal pigmentation, contrasting with the pink eyes characteristic of albinism. This highlights how easily pigment genes can be altered within a species lineage.
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