Re: NANFA-- snorkeling with satinfins

Bruce Stallsmith (
Mon, 02 Jul 2001 10:06:36 -0400

Good points, Chris. The reproductive strategies of various fishes help to
explain why some of them are in trouble due to human disturbance, and why
others are doing OK. The crevice spawning strategy of _Cyprinella_ is part
of the reason that red shiners, _C. lutrensis_, are such aggressive exotics
when introduced outside of their natural range. The various _Campostoma_
stonerollers are holding their own for the most part because of their
nest-building and guarding strategy. I'm all revved up on this of late after
reading Carol Johnston's article, "The relationship of spawning mode to
conservation of North American minnows (Cyprinidae)" in Environmental
Biology of Fishes, 55:21-30, 1999. These behaviors fascinate us as
observers, and as I said are critically important to understand for
successful conservation strategies. I downloaded a .pdf copy of the article
off of google, so you don't even need access to a university library to get
this article.

--Bruce Stallsmith
Huntsville, AL, US of A

>Unlike most other minnows, in which the females deposit most or all of
>eggs at once, Cyprinella are "fractional spawners," so called because
>females deposit only a fraction of their eggs during each spawning act. As
>result, the Cyprinella breeding season can last from the spring through
>summer, and even into autumn in some areas. Fractional spawning is said to
>increase reproductive potential by reducing the number of larvae that
>compete for food and space at any one time. It's also a wise strategy for
>fishes that are choosy about where they spawn; since the number of
>appropriate crevices in any given stream may be limited, fractional
>allows Cyprinella to reuse the same sites week after week after week.
>Chris Scharpf

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