Re: only male fry

["Nuno Prazeres" <nprazeres@vodafone.pt>]

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
> >
> >-----------------------------------------------------------------------
> >-- This is the apistogramma mailing list, apisto@listbox.com. For
> >instructions on how to subscribe or unsubscribe or get help, email
> >apisto-request@listbox.com. apisto-digest@listbox.com also available.
> >Web archives at http://lists.thekrib.com/apisto Trading at
> >http://blox.dropship.org/mailman/listinfo/apisto_trader
> >
> >  
> >
> 
> 
> -----------------------------------------------------------------------
> -- This is the apistogramma mailing list, apisto@listbox.com. For
> instructions on how to subscribe or unsubscribe or get help, email
> apisto-request@listbox.com. apisto-digest@listbox.com also available.
> Web archives at http://lists.thekrib.com/apisto Trading at
> http://blox.dropship.org/mailman/listinfo/apisto_trader

-- 
___________________________________________________
Check out the latest SMS services @ http://www.operamail.com, which allows you to send SMS through your mailbox.

Powered by Outblaze

-----------------------------------------------------------------------
-- This is the apistogramma mailing list, apisto@listbox.com. For
instructions on how to subscribe or unsubscribe or get help, email
apisto-request@listbox.com. apisto-digest@listbox.com also available.
Web archives at http://lists.thekrib.com/apisto Trading at
http://blox.dropship.org/mailman/listinfo/apisto_trader



-----------------------------------------------------------------------
-- This is the apistogramma mailing list, apisto@listbox.com. For
instructions on how to subscribe or unsubscribe or get help, email
apisto-request@listbox.com. apisto-digest@listbox.com also available.
Web archives at http://lists.thekrib.com/apisto Trading at
http://blox.dropship.org/mailman/listinfo/apisto_trader