Re: NANFA-- Rivulus reproduction

Bruce Stallsmith (
Wed, 29 Dec 1999 00:55:15 EST

Check Bruce Turner's Rivulus page at There's
more genetic diversity than you'd think, because there are males in the
species in low frequency, and also because meiosis (gamete production) can
shuffle the deck of an individual's genome even in self-fertilizers. And,
they're cool fish in their own right.

--Bruce Stallsmith
still in Huntsville, AL

>As a relative novice to the wunnerful world of fish,
>I was totally amazed when I read a piece about how
>Rivulus marmoratus reproduces. Self-fertilizing
>hemophrodites! Cool! (There are other species among
>molluscs and amphibians who do this too, right?
>But I never heard of it in fish!)
>What kind of genetic diversity is found in the
>offspring of a single fish? Are they clones of the
>parents? If so, how "old" is this species? I'm
>fascinated by the (probable?) absence of genetic
>diversity that would otherwise be present in
>sexually-reproducing species, and the natural
>selection effects that would have steered the
>evolutionary course of this fish.
>- shireen

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