Re: only male fry

[António Vitor <antonio.vitor@sapo.pt>]

hops sorry folks!
I thought that I was only replying to Nuno prazeres, so it was in
portuguese...sorry about my mistake...
:(

I was saying that there could  be some anti-breeding genes that could turn
active when too much equal copies of some genes are detected, it make sense
in the evolutionary view.

if some apistos evolved in tiny places, inbreeding could make more non
viable fish, so a gene that could prevent this and make more viable fish
make sense...

what you think about this?

Sorry about my english...
Regards!
António Vitor


----- Original Message -----
From: "António Vitor" <antonio.vitor@sapo.pt>
To: <apisto@v2.listbox.com>
Sent: Wednesday, December 03, 2003 8:06 PM
Subject: Re: only male fry


> andei a pensar...
> e se existirem genes anti inbreeding?
>
> como o inbreeding é mau para a espécie pode haver genes que detectem
quando
> há muitas cópias iguais de genes.
>
> Geralmente o inbreeding gera animais defeituosos, um gene que podesse
> previnir isto faz sentido a nivel evolucionário, já que se os apistos se
> reproduzirem em ambientes fechados e pequenos (charcos), pode ser útil um
> gene deste tipo (mais alevins viáveis).
>
> que achas?
> se for uma ideia estúpida não mando para a lista...
> :)
>
>
> ----- Original Message -----
> From: "Nuno Prazeres" <nprazeres@vodafone.pt>
> To: <apisto@v2.listbox.com>
> Sent: Wednesday, December 03, 2003 7:36 PM
> Subject: Re: only male fry
>
>
> I read somewhere (maybe Romer) that very selected lineages tend to produce
> skewed sex ratios and temp and pH become less of an issue in those
> particular cases. If your friend's apistos are a result of intense
selective
> breeding this might explain the fact.
>
> In my humble opinion your friend should try to spawn the apistos at 25C
and
> then during larval period lower one degree per day until it gets down to
22.
> It might be helpful to move pH up a bit if it is too low. After about 600
> hours over the birthtime temp can go up again because sex is formed. I am
> basing this on reading material and not experience. Generaly the higher
the
> tem the more males you get. Is some species the same happens with pH but
to
> a lower extent aand the lower the pH is the more males you get. Since sex
is
> formed in teh first weeks and not determined at spawn time spawning
> temperature can be confortably the very same.
>
>
> Sorry for my mispell about m and micro Siemens. 1 milli = 1000 micro :-)
>
>
>
>
> -----Mensagem original-----
> De: owner-apisto@v2.listbox.com em nome de Dániel Gergely Faragó
> Enviada: qua 03-12-2003 18:31
> Para: apisto@v2.listbox.com
> Cc:
> Assunto: Re: only male fry
>
> Hi,
>
> Thanks for the answers. Though I am getting a bit confused. As live in
> Europe TDS is not a common thing to measure. But we have gH and kH. So
could
> you tell me if there is a correlation between dH and gH. Now I have a
total
> hardness about 6-7° gH.
>
> Second, if I get it right the rules Mike wrote do not apply as the water's
> getting harder. So 7 microsiemens do not equal 7° dH (and 7° gH I
suppose).
>
> And last, if the temperature is kept under 26 C, what can be the cause of
> having no females in the fry? (I ask this quite theoratically, as my
friend
> keeps telling me that temperatures couldn't rise higher than 26 C, but
> egglaying happened in summer, and it is not easy to cool the water.)
>
> Thanks again
>
> Daniel Faragó
> ----- Original Message -----
> From: Mike & Diane Wise <apistowise@bewellnet.com>
> Date: Wed, 03 Dec 2003 09:53:41 -0700
> To: apisto@v2.listbox.com
> Subject: Re: only male fry
>
> > Of course you are correct, Lee.  That is why I wrote, "At low levels of
> > total dissolved solids, 1 ppm TDS "roughly" equals an electrical
> > conductivity of 1µS (microsiemen)." For almost all intended purposes in
> > the soft water end of the hobby they can be considered equivalent. If
> > you look at common inexpensive aquarium conductivity meters there is no
> > difference in range between those measuring ppm TDS and µS/cm. They are
> > the same instrument reading the same values. It probably would have been
> > more accurate to say that 1µS roughly equals 1ºdH.
> >
> > Mike Wise
> >
> > LeeH920226@aol.com wrote:
> >
> > >In a message dated 12/2/03 11:32:56 AM, apistowise@bewellnet.com
writes:
> > >
> > ><< TW I think there was a typographical error in the answer you
received
> > >
> > >about ppm. At low levels of total dissolved solids, 1 ppm TDS roughly
> > >
> > >equals an electrical conductivity of 1µS (microsiemen). 1 mS
> > >
> > >(millisiemen), or 1000 µS, roughly equals 1000 ppm. It is not an
unusual
> > >
> > >mistake on emails. Many do not know how to type a micron symbol (µ)  &
> > >
> > >mistakenly use an "m" instead. The use of an "m", of course, represents
> > >
> > >"milli" in metric units. >>
> > >
> > >No, the TDS in ppm does not equal the conductivity in microsiemens/cm.
> The
> > >relationship is variable depending on the exact composition of the
> dissolved
> > >ions. It ranges from 1.5 to 2.0 /1 Conductance/TDS. Most common water
> supplies
> > >are at a 1.7/1.0 ratio.
> > >
> > >Lee Harper
> > >Media, PA
> > >
> > >-----------------------------------------------------------------------
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> >
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