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Poecelia endlers


  1. Poecilia sp. "Endlers"
    by (Richard Sexton) (15 Jan 1995)
  2. Prof. John Endler on Endler's Livebearer
    by richard/ (Richard Sexton) (7 Oct 1995)
  3. endlers as companion fish
    by Piabinha/ (Sat, 22 Jan 2000)

Poecilia sp. "Endlers"

by (Richard Sexton)
Date: 15 Jan 1995
Newsgroup: rec.aquaria,sci.aquaria,alt.aquaria

The rough and tumble crowd I've recently fallen in with (The Canadian
Killifish Association) has some members very interested in livebearers
and aquatic plants.

One fish I saw at a members house relly impressed me, to the point where
I now have a small tank of them. The fish is Poecilia Sp. "Endlers", or
commonly called, "Endler's Livebearer".

They might be guppies. Guppies as in wild type guppies. They're about the
size of wild guppies, and generally resemble them in many ways except
for two things: first, they're always double swordtails, and second
the coloration is different. They have 4 or five streaks of color
that cover the whole body, one of bright orange, one of black one
of bright metallic green and a couple of other I don't remember.

The patterns is similar but not identical on every fish, unlike
wild guppies which are extremely variable.

Compared to show quality fancy guppies (ok, got a few of those, too)
they nothing; they arn't half the size and of course don't have the
big triangular veil tail, but because of the coloration they're
quite striking; words do not aadequately describe them.

It is uncertain if they are guppies either population of Poecilia
reticula or a distinct species. Hence the current designation.

It's unlikely you'll see them in a pet stores. Wierd livebeaers
don't show up there (for a reason - they're either grey or brown)
and even these, which are quite colorful, just can't compete
with the fancy guppies. You may be able to find them through
local aquarium societies - through them you may find somebody
in the Livebearer Assocication. I got mine from Jim Robinson
who is the species maintanence coordinator for that association.

Anybody in Toronto, or planning to come to Toronto is certainly
welcome to a gravid female (a guarenteed breeding pair!) from me
or Jim.

            ``It's too dark to put the keys in my ignition''
Richard J. Sexton  /  VRx Network Services, Inc.  /

Prof. John Endler on Endler's Livebearer

by richard/ (Richard Sexton)
Date: 7 Oct 1995
Newsgroup: sci.aquaria,rec.aquaria,alt.aquaria

Permission obtained ot post this email to usenet, all other use,
send email to the author.

~Date: Mon, 17 Jul 95 14:40:57 PDT
~From: (John Endler)
~Subject: for Richard Sexton
Cc: endler-at-lifesci

Richard J. Sexton

Dear Mr. Sexton,
   A friend gave me a copy of your description of "Poecilia Endler's", and
I thought that you might like to know a little more about my namesake!
   I discovered these fish in Laguna de Patos, near Cumana, northeastern
Venezuela in 1975.  They had in fact been collected in 1937 by Franklyn 
F. Bond, but I didn't know that at the time.  (I found his collection in the
Museum of Zoology of the University of Michigan).  They were found in warm
(27-30 degrees C) bright green and hard water in a small lake.  The bright
metallic green is about the only thing that a prospective mate can see in this
very (unicellular) algae-rich water.  Interestingly enough, a single
population of guppies that I found in southern Trinidad living in a similar
habitat was just starting to evolve the metallic green coloration, but it was
nothing compared to this species.  The original stock was much more
polymorphic variable than the present one in the aquarium trade.  I have also
long since lost the stock but it is supposed to be in the process of being
named by some people in Germany.  I wanted them to call it Poecilia haskinsi
after Caryl Haskins, who knows more about wild guppies than anyone, and who
started me out studying these interesting species!  
    "Endler's Poecilia" got into the Aquarium trade via Klaus Kallman of the
New York Aquarium, who got it from the late Donn Eric Rosen, the major
taxonomic expert of the Poeciliidae, to whom I gave it so that he
could name it.  Unfortunately he died before naming it.  Klaus gave it to
aquarists and added the present common name ("Endler's Livebearer" or
"Endler's Poecilia") with out telling me (as a surprise), and I first 
heard about it during a visit to England in the mid-1980's.  It was quite
a surprise, but also a disappointment to see how much of the original
color pattern variation has been lost through inbreeding and founder
events.  The wild fish are not always "double swordtails", have much more
variable color patterns, and some even have black pectoral fins.  But
all have the lovely metallic green spots, though variable in size, shape,
and position.  Although highly variable, the wild fish are not quite as
variable as wild guppies, though much more so than P. picta or P. parae--the
closest relatives.  You mention their not having the "big triangular veil
tail", but wild guppies never have the veil tail either; veil tails are an
artifact of selective breeding.
   "Endler's Poecilia" are not the same as guppies (Poecilia reticulata).  One
of the first things I did when I found them in 1975 was to try to cross them
with wild guppies from a few kilometers away in Venezuela, as well as with
other wild stocks of guppies.  Occasionally I would get F1 hybrids, but that's
all; they are clearly a distinct species.  They live only in two sites in
Venezuela, one of them (Cumana) next to the city dump, so they might even be
extinct now in the wild.  Someone should try to go back and check.  The second
population I only heard about but was unable to find--at the base of the
Peninsula de Paria.  The fact that they may be endangered makes me happy
that they are being kept by aquarists!
         With best wishes,
                      John A. Endler
                      Professor of Biology

| Prof. John A. Endler                                             |
| Department of Biological Sciences                                |
| University of California                                         |
| Santa Barbara, California, 93106-9610 USA                        |
| tel: 1+ 805-893-8212 (office)    fax: 1+ 805-893-4724            |
| tel: 1+ 805-893-8249 (lab)       e-mail: |
Richard Sexton                       There is no Cabal

endlers as companion fish

by Piabinha/
Date: Sat, 22 Jan 2000
To: apisto/

In a message dated 1/22/00 2:22:40 PM Eastern Standard Time, writes:

> Hi,
>  I have tried keeping both together and lost the Endlers due to the soft
>  water.
>  Now the endlers are in an emerser tank (ie plants half in and half out of
>  water, with a nice spray bar on one corner to keep he humidity up), and
>  there are probably over a hundred in 4 incles of water in a 50 gallon
>  circular tank.  Doing great there.  We rotate anubius and other plants
>  in/out of this tank to let the algae get off of them, and keep a few other
>  species in there that like it.
>  Kathy

i tried to keep endlers in a 10 gallon tank with a pair of apistos and it 
didn't work out.  i'm not sure why, as i can't imagine that the apistos would 
prey on the fry (i assume the fry would hide in the floating riccia) but i 
never had a thriving colony and ended up pulling out the adults to their own 

>  PS On a side note I had heard for years endlers was extinct, now I hear
>  they may have found one more wild population.  That is heresay, don't know
>  if it was true.  I heard stories on the originals that they were in some
>  mudpuddles by a dump that was later developed. 

endlers were originally found in laguna de patos, as i understand, a 
landlocked lagoon or lake near the coast in venezuela.  there were concerns 
about their existence due to pollution of the small laguna.  however, armando 
pou in florida made a collecting trip and found thriving colonies of 
different types recently.  some of the fish he brought back are even more 
colorful than the original collection.  as an aside, it's not clear yet if 
the endlers are a separate species or just a subspecies of the guppy.  i 
suppose that depends if you are a splitter or a lumper.

tsuh yang chen, nyc, USA

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