Re: NANFA-- Bluenose Shiners & Pond Update

Steffen Hellner (
Tue, 23 Sep 2003 09:18:28 +0200

> I don't know if just any centrarchid would do. Welaka have only been
> observed spawning over L. megalotis nests, but since L. marginatus are in
> their range, it's worth a try.
> Note: pumpkinseed and welaka/hubbsi do not naturally co-occur. But David M.
> Schleser spawned P. hubbsi in 800-gallon, bare-bottomed fiberglass ponds
> each stocked with a pair of pumpkinseeds. In previous years, P. hubbsi
> placed into ponds without sunfish colored up but did not spawn

Welaka, and hubbsi are said to be facultative co-spawners in Centrarchid
nests. Everything else would not make sense, as if a species only spawn into
nests of another this would cause a 100 % dependence upon the presense of
that species. And this would extend to a kind of coexistense which would be
a serious threat to the co-spawning species.
SRBD and others are also said to show this behaviour and my SRBD spawned
without any other nest present. As far as I know welaka, and hubbsi have
been reported to spawn solitarily in tanks.

>> As I prepare my pond for the bluenose shiners and dollar sunfish, I have
>> decided to make two sections that the dollars can't follow the welaka
> This *may* not be necessary, depending on the size of the pond and the size
> of the fish. Although no existing research that I know of confirms this, I
> wouldn't be a bit surprised that the dollars ignored the welaka. Nature has
> a way of letting nest host and nest associate peacefully coexist (e.g., Ray
> Katula's observation of bowfin allowing golden shiner to use their nest).
> Both species theoretically benefit from the association. (I also remember
> the welaka B.G. brought to the 1999 NANFA convention. They were placed in a
> tank with big megalotis, and the megalotis ignored them.)

What4s the benefit for the putative predator to allow co-nesting? Have more
food afterwards? ;-)

> Anthony Terceira said it best when he noted welaka's increasing rarity in
> his 1975 spawning account: "I hope this fish does not become another
> fatality of progress, [for] it is simply too beautiful to lose."

Tony was terribly right, then. And still is.

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