What keeps an asexual fish species from taking over?

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What keeps an asexual fish species from taking over?

When a red-bellied dace and a finescale dace (freshwater fish in the carp and minnow family) mate with each other, they produce a hybrid with a very special ability: it can reproduce asexually. This asexual hybrid should have a tremendous evolutionary advantage over its sexually reproducing forefathers. So why doesn't the hybrid dace take over?

View full resource at sciencedaily.com

Tags: Relationship, Nature