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Re: dodgy RAC

To: <killietalk at aka_org>
Subject: Re: dodgy RAC
From: "Robert J. Goldstein" <rgoldstein at rjgacarolina_com>
Date: Wed, 3 Oct 2001 12:33:52 -0400
References: <5.1.0.14.2.20011003091914.02267ac0 at postoffice_mail.cornell.edu>

Bruce Turner commented on something similar in the past. Discussing the
complex taxonomy of notho species, he pointed out that nearly identical fish
in adjacent habitats were often genetically incompatible (nonviable
offspring) while very different looking fish from distant habitats could
produce hybrids (don't know if he mentioned whether they were fertile or
not). As to behavior, with most species they will select their own first,
and only accept substitutes if their own are not available, but whether
that's true of nothos I cannot say. Perhaps Brian Watters has observed them
in the wild and can answer this question. On a TV show, one girl was asked
what kind of guy she was looking for and she replied that he had to be a
mammal. Sometimes I think nothos think the same way.

----- Original Message -----
From: Barry Cooper <bjc3 at cornell_edu>
To: <killietalk at aka_org>
Sent: Wednesday, October 03, 2001 12:23 PM
Subject: RE: dodgy RAC


> It is true that one can find multiple species of Nothobranchius in one
location. I don't know how they recognize one another, but they presumably
can. Explain it as pheromones or whatever. It is also quite possible that
males do try to spawn with inappropriate females in the wild although I
would guess, and it is only a guess, that they would prefer females of their
own species. I assume that species found in the same locality cannot
interbreed to produce fertile eggs. Species found at different localities,
that do not have the opportunity to interbreed in nature, sometimes can
interbreed to produce hybrids, of course.
>
> Barry
>
> At 04:10 PM 10/3/01 +0200, you wrote:
> >Hi all
> >
> >Maybe the people that have collected Notho's in the
> >wild can answer.
> >When Guy said that a male Notho will drive any female
> >to spawn, I remembered that sometimes you get more than
> >one Notho in the same pool in the wild. How do they
> >breed true, without breeding with the wrong female.
> >There must be some way that they know. Even saying that
> >it unnatural for a RAC male and KOR female to be
> >together, the same thing will happen in nature, maybe
> >just in a animal footprint than a glass tank.
> >
> >Cheers Rudolph
> >
> >
> >> -----Original Message-----
> >> From: Guy Wren [mailto:killies at guyonet_free-online.co.uk]
> >> Sent: 03 October 2001 03:57
> >> To: killietalk at aka_org
> >> Subject: RE: dodgy RAC
> >>
> >>
> >> Hi RJ,
> >>       cheers for the reply. I used to have quite a few
> >> foerschi females at one point and the image of blue scaled
> >> fems is just stuck in my mind, so maybe there is
> >> some variability. I can't think of any of the other nothos
> >> I've had that ring the same bells. Maybbe there is some
> >> variability? My male is spawning with all the fems in the
> >> tank, but I was under the impression that male noth's would
> >> drive any fem regardless of species.
> >>       cheers ,
> >>               Guy
> >>
> >> 02/10/01 05:11:07, "Tranquility Base"
> >> <TranquilityBase at NetZero_Net> wrote:
> >>
> >> >Hi Guy,
> >> >
> >> >
> >> >I have not seen this blue edging on the scales of either RAC
> >> of foershi
> >> >females. I have noticed the blue in the gill covers of the
> >> RAC however. I
> >> >have heard several stories of people mixing Nothos females
> >> in order to make
> >> >up pairs. It is hard to know if any of these are true. I
> >> suppose that the
> >> >males will be the best judge of what you bought. If they
> >> spawn the females
> >> >are RAC.  If they do not, I think you can assume that you
> >> have something
> >> >else.
> >> >
> >> >
> >> >Peace,
> >> >
> >> >~RJ~
> >> >
> >>
> >>
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> ___________________________________________________
> Barry J. Cooper, Prof., Dept. Biomedical Sciences, Cornell University
> Current address: 27505 Riggs Hill Rd.
> Sweet Home, OR 97386 (bjc3 at cornell_edu)
>
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References:

RE: dodgy RAC

From: Barry Cooper <bjc3 at cornell_edu>

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