Re: f1 spawning

["Vern Wensley" <vernwen@home.com>]

-----Original Message-----
From: IDMiamiBob@aol.com <IDMiamiBob@aol.com>
To: apisto@admin.listbox.com <apisto@admin.listbox.com>
Date: March 13, 1999 2:14 PM
Subject: Re: f1 spawning


>Vern writes:
>
>> Has anyone encountered this problem,f1 fish are harder to spawn.I was
>>  talking to David Soares and we got talking about this.He said that some
of
>>  his wild fish will spawn quite easy and then when the fry are old enough
>>  they are very difficult or impossible to get a spawn out of them.I have
had
>>  this happen with my uaupesi.I would think it would be the other way
>>  around.The wild fish are not use to your water and if you got them to
spawn
>>  the fry would grow out in your water and be use to it.So they should
spawn
>>  more readly.I think this happens with the more difficult spieces.Has
anyone
>>  run into this before.Any thoughts on this would be appreciated.
>
>In the wild, fry "grow out" on a very broad-spectrum diet.  In our tanks,
we
>tend to feed them BBS and pat ourselves on the back for our good husbandry.
>There are too many nutrients necessary for any vertebrate species to
flourish
>for this to be an effective practice.  At the current time I am raising my
fry
>on BBS, but not making serious efforts toward breeding.  I have encountered
>this for the first time with my current generation of cacatuoides, which
are a
>long way from F1, to a small degree.  I usually have microworms and/or
vinegar
>eels available to supplement.  Translating this line of thinking to an F1
>breeding problem, the few F1s that overcome their deficit pass on whatever
>ability to overcome they have on to F2, and the problem diminishes.
>
>Gary had the following thought:
>
><snip>> Maybe wild males with no territorial/spawning drive get driven out
of
>desirable habitats, and effectively culled.<snip>
>
>Over the millenia, DNA with no desire to propagate itself will long ago
have
>been culled.  Face it- the only reason we exist {theological justifications
>excused) is to duplicate little strands of nucleic acids.  Any DNA which
>doesn't reproduce extincts itself.  A reproductive drive is essential for
>survival of the species.  Gary's unmotivated fish would have been all but
>genetically culled long before modern times.  Only one in a zillion fish
would
>be born with this non-desire gene.
>
>My explantion is only theoretical.  YMMV.
>
>Bob Dixon
>
>
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