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RE: N. rachovii

Nonn Panitvong wrote:

>
> Tyrone Genade wrote:
> >>Almost all the rachovii in the trade come from along the road
> between the
> >>Biera and its airport. Those that don't are clearly marked.<<
>
> Anyone know how long is this road?  And are there any variation among the
> population of this particular "locality"?
>

Yes, there is considerable variation in that some specimens have a lot of
orange-red on the (front part of the body) while others are dominantly blue.
Some wild males are truly magnificent whereas others are quite plain. This
is the case with both the Beira '91 and '98 populations. One does not see
this variation in the aquarium strain, presumably because of many
generations of selective breeding.

>
> Barry Cooper wrote:
> >>If you are interested the study, I can dig out the actual reference.
> >>However, I think this study strongly supports the position most
> of us take
> >>that known locality populations should not be interbred in the
> aquarium.<<
>
> Yes please, I'm interested to read this article.  This is very
> interesting.
> so, I guess, this 2 Rac's strains I have are the results of reproductive
> isolation in captivity, no?  Do we have Rac in captivity long enough that
> this 2 strains is the result of that?
>

I am not sure if this is still the case but a few years back (mid to late
80s ?) the N. rachovii being maintained in Europe were distinctly different
from those being kept in the USA in spite of the fact that they had the same
origins. The former had a finer and more sharply defined pattern on the
unpaired fins and, for me at least, were the more difficult to maintain. The
latter had (and still have) a relatively coarse patterning on the fins and
seemed to be easier to maintain. I reasoned this to be the result of the
European aquarium strain being relatively isolated reproductively from the
North American strain.
___________________________________________
Brian R. Watters
University of Regina
Regina, Sask. S4S 0A2, Canada
Ph: (306) 584-9161 (home); (306) 585-4663 (work)
Fax: (306) 585-5433
E-mail: bwatters at sk_sympatico.ca


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