semi off-topic response [was: Ailing krib and Krib genetics]

["jeffrey" <jtgras@door.net>]

i have a pair of wild caught yellow kribs, and the male has no ocelli
whatsoever.  the female and all of their offspring do, though.  wierd?
----- Original Message -----
From: <IDMiamiBob@aol.com>
To: <apisto@majordomo.pobox.com>
Sent: Wednesday, March 29, 2000 11:06 PM
Subject: Re: Ailing krib and Krib genetics


> Simon writes:
>
> > At the
> >  moment we are gathering information about inheritance patterns in
> kribensis.
> >  The kind of things we are seeking is which features of krib are
inheritable
> >  traits and which are environmentally influenced traits. Traits like
vigour
>
> Lack of vigor tends to be a byproduct of line-breeding, which somehow
gives
> weaker genes an advantage in gaining distribution within a population.
>
> >   I don't know whether anyone has noticed but male krib seem to die a
lot
> >  just after spawning and are less vigourous than they were say 10 years
> >  ago ), number of ocelli on the tail and dorsal, and intensity of the
red on
> >  the bellies of both males and females, the extent of the red on the
belly
> of
> >  the female, the mothering instinct of female krib and the defensive
nature
> >  of male krib, are examples of traits we'd like to improve but this is
> >  pointless if we don't know how these traits are inherited.
>
> All of these are genetic traits, but diet, water parameters, and the
"general
> environment" influence the development of these things.  There has been a
> recurring theme on this list debating the disappearance of the "parenting
> instinct" amongst dwarf cichlids, primarily when dealing with certain
lines
> of M. ramirezi, which seem to be totally devoid of any parenting instinct
at
> all.
>
> IMHO, parenting instincts are influenced by environmental factors that we
> don't fully understand.  GH, pH, temperature, sufficient cover from
> predators, any and all of these, as well as others as yet unconsidered are
at
> play.
>
> Your goal of improving a strain is worthy of the effort it will involve,
and
> I hope you will keep us all advised.  Close observation by a number of
> hobbyists may also help us to understand the way the various factors
> interplay with genetics.
>
> Bob Dixon
>
>
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