Re: extra male Aggie Alenquers

[Mike & Diane Wise <apistowise@fgn.net>]

Ken,

I know that secrecy still exists among commercial collectors, but these people
rarely use a locale name on their fish. Most location names that are now published
are from aquarists who actually collected the fish, not commercial collectors. A.
agassizii is one of those problem fish. Uwe Römer once wrote me that we might be
dealing with either one widely distributed species or 12 or more daughter
(sibling) species.

As for a better sex ratio, I'd try dropping the fry's rearing tank temperature to
around 72-74ºF (22-23ºC) for the first 4-6 weeks. I'll bet you'll skew your ratio
to mostly females. I once had a spawn in which all agassizii 100 fry sexed out to
be females. It was late summer & I wasn't heating the fish room when the adults
spawned. It was cooler than usual during the day and night, temperatures dropping
into the mid-60s F. The tank temperature stayed around 72ºF for about a month
until I started heat the room.

Mike Wise

Ken Roese wrote:

>         I did notice a little difference in the blues. Thought it might be
> something to do with the photograph more than the fish. I've also heard
> stories of collectors naming fish for a collection site where they were
> never collected from to protect their fishing holes from competitors, thus
> I just wanted to make sure.
>         Now, how can I get a larger female ratio? Lower temp or Higher temp? I
> have read temps can decide the sexes in apistos and pH in west africans. My
> WA's I can get a good ratio, my apistos are always skewed,
>
> Thanks,
> Ken
>
> At 10:41 AM 2/13/2002 -0700, you wrote:
> >Ken,
> >
> >Alenquer & Iquitos Blue are at least different populations. Whether or not
> they are
> >the same species - or even A. agassizii - is up for question, too.  Both
> 'forms' show
> >minor differences from the holotype of A. agassizii. That's why I say they
> might not
> >even be A. agassizii. Undoubtedly they are closely related although not
> found close
> >together. Let's face it Iquitos, Peru is a couple of thousand miles up the
> Amazon from
> >Alenquer, Brazil. I've never seen a live Iquitos Blue (? = A. cf. agassizii
> >(Pastel/Tapiche) ?), only photos. These photos show a more pastel
> blue/gold fish than
> >the metallic blue/gold A. cf. agassizii (Alenquer) that I've had. I can
> see subtle
> >differences in the caudal fin pattern, but I can't honestly say this is
> diagnostic. It
> >may very well be due to the small number of pictures of Iquitos Blue (only
> 2) that
> >I've seen.
> >
> >A. agassizii (in the broadest sense) is extremely widespread all along the
> main
> >channel of the Amazon, including up into the middle Rio Negro and
> mid-upper Rio
> >Madeira. Considering the amount of isolation and resultant lack of genetic
> mixing, I
> >wouldn't be surprised if we are seeing some sort of speciation in this
> "species".
> >We'll just have to wait for genetic testing to know for sure. Until then I
> wouldn't
> >list them with a locality name (Alenquer or Iquitos Blue) if I crossed the
> two. I'd
> >probably just call them 'Blue & Gold Agassizii'. It would be unethical to
> give them a
> >locality name when selling to others interested in pure populations.
> >
> >Mike Wise
> >
> >Ken Roese wrote:
> >
> >> Are the Alenquer and Iquitos Blue the same fish. All the pics I've
> >> seen of Iquitos look a lot like the Alenquer.
> >>
> >> At 12:41 AM 2/13/2002 -0500, you wrote:
> >> >Hello all
> >> >
> >> >Nice to have everyone back... Hope you are doing well...  I know I am up
> >> >here in the Mts.
> >> >
> >> >I know its cold and frigid here in the northeast but i have about 6
> >> >extra male Alenquers.. Is anyone in need of a male or two... I can wait
> >> >till warm weather to ship them to you...or they go to auction this
> >> >weekend... one way or another i would like to have them find a new home.
> >> >
> >> >John
> >> >
> >> >
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