Re: [Killietalk] Hatching Notho eggs

[Brian Watters <bwatters at shaw_ca>]

Gary,

Multiple species in the same habitat do not hybridize, otherwise they would
not be co-existing as distinct species. In such situations one never sees
hybrids. In the extreme, if they did hybridize we would always find only one
species in any particular habitat. Even when the females of one species look
very similar to those of another syntopic species, and we as collectors have
difficulty telling them apart, they still don't hybridize. The fish know the
difference. I discussed aspects of this in my article "Dispersal of
Nothobranchius - Fact and Fiction" in the May-Aug, 2006 issue of JAKA.

It is possible to hybridize syntopic species in the aquarium because they
are confined to a small unatural environment and have no choice but to mate
with whatever other species is available. But this, apparently, does not
happen in nature.
___________________________
Brian Watters
6141 Parkwood Drive
Nanaimo, BC, V9T 6A2
Canada
Ph: (250) 760-0564
E-mail: bwatters at shaw_ca

> -----Original Message-----
> From: killietalk-bounces at aka_org [mailto:killietalk-bounces at aka_org]On
> Behalf Of Gary Smith
> Sent: December 13, 2007 4:25 PM
> To: killifish discussion list
> Subject: Re: [Killietalk] Hatching Notho eggs
>
>
> Brian,
>          When collect in a pond that has differant species in it
> there must
> be some hybidizing going on. If so, do you collect these fish as well and
> assume its a new species or do you have to run test on them to see if its
> pure or hybrid. I always wondered about that. And what about when
> the rains
> come and flood everything, do 2 ponds ever connect together? And
> if so then
> one would assume that fry of differant locations get mixed, grow
> up and then
> spawn together. What happens then? I thought I read this year
> that parts of
> Africa were flooded and that got me to thinking.
> Gary
> ----- Original Message -----
> From: "Brian Watters" <bwatters at shaw_ca>
> To: "killifish discussion list" <killietalk at aka_org>
> Sent: Wednesday, December 12, 2007 3:25 PM
> Subject: Re: [Killietalk] Hatching Notho eggs
>
>
> > Personally, I don't think that is necessary, unless you water is very
> > hard.
> > However, the reasoning is that when the habitats initially
> fill, the water
> > will be essentially rainwater which has a low total dissolved solids
> > (TDS)content. With time, various chemical components will be
> leached out
> > of
> > the substrate and there might also be a mixing with groundwater, so the
> > TDS
> > increases.
> >
> > I have actually been able to measure this effect. I was once
> camped next
> > to
> > a Notho habitat in a game reserve and when we set up camp the
> habitat was
> > bone dry. The following morning it rained very hard for a
> couple of hours
> > after which the water in the habitat was about knee-deep. I
> measured the
> > TDS
> > at intervals over a 24 hour period and that value increased from <10 ppm
> > initially to something >100 ppm within that period, which would
> have been
> > getting quite close to the normal TDS for that habitat.
> > ___________________________
> > Brian Watters
> > 6141 Parkwood Drive
> > Nanaimo, BC, V9T 6A2
> > Canada
> > Ph: (250) 760-0564
> > E-mail: bwatters at shaw_ca
> >
> >> -----Original Message-----
> >> From: killietalk-bounces at aka_org [mailto:killietalk-bounces at aka_org]On
> >> Behalf Of BrandtEdL at aol_com
> >> Sent: December 12, 2007 12:02 PM
> >> To: killietalk at aka_org
> >> Subject: [Killietalk] Hatching Notho eggs
> >>
> >>
> >> Hi all, I'm relatively new to Nothos.  My question is:  Why is it
> >>  suggested
> >> that the eggs be hatched in rain water while the adults are
> kept in  hard
> >> alkaline water?  Thank you all in advance for any answers.
> >> Ed Brandt
> >>
> >>
> >>
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>
>
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