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Re: In breeding

Sometimes it is not the results of inbreeding it can be other conditions
like water and temperature that makes that makes a strain go down hill.
Every time it rains and the streams get a shot of new water the conditions
of the water and the temperature changes. Older fish of annuals are in more
concentrated water and the mineral content is higher, namely calcium. The
calcium is used in the egg and also in the adult fish which produce better
eggs. A lot of breeder give their fish the same water every time they change
it and they are so scared of small changes that they do water changes daily.
Try boiling a chicken egg for 20 min. and then crush the yolk and feed a
SMALL amount of the yolk to young fry. DO NOT OVER FEED if you do over feed
siphon the left over out before it pollutes the tank and velvet starts.
My.0002 cents worth and I hope it is not to cryptic.

----- Original Message -----
From: "Tyrone Genade" <Tgenade at sun_ac.za>
To: <killietalk at AKA_Org>
Sent: Wednesday, July 10, 2002 8:21 AM
Subject: Re:

> On 9 Jul 2002, at 10:33, Katz, Sue wrote:
> > I'd like to refer folks to the Science (AAAS) Journal that just
> > arrived this past week.  It is the June 28, 2002 edition.  Authors:
> > A. R. McCune et al., from Cornell, Dept. Ecology and Evolutionary
> > Biology.  Title of paper:  A low genomic number of recessive lethals
> > in natural populations of bluefin killifish and zebrafish This has
> > direct relevance to us fishkeepers, and our concern about
> > inbreeding.
> What would the results be if annuals were studied? This fish are
> naturally given to inbreeding over many generations. It stands to
> reason that the incidence of lethal alleles would be much lower?
> Yes, the results do point to the importance of proper breeding
> practice. Many of the old strains are decended from small numbers
> which were bred purposely for the aquarium trade. Reading Scheel's
> ROTOW reveals many breeding attempts that ended in failure. The AUS,
> GAR etc... we have today is as much the product of pot luck as the
> amazing breeding skills of the killikeepers of yester-year.
> To give an indication of the pot-luck idea... My dageti strain has
> gone through several bottlenecks (1 male or female remainging). Along
> the way the strain has lost productivity and the eggs have become
> very sensitive (you can't touch them without them fungusing). I now
> have 1 female left that is "on her way out". Inbreeding has an
> effect, even on old aquarium strains.
> It is important that at all times we select, like in nature, for
> productivity and vigor.
> tt4n
> Tyrone Genade
> tgenade at sun_ac.za
> http://www.tyronegenade.0catch.com
> *************************************************************
> P450 Lab, Biochemistry Department
> University of Stellenbosch, 7602, South Africa
> Ph: +27-021-808-5876, fax: +27-021-808-5863
> **********************************************************
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