[Cyprinodontiformes] Aquarium Glaser Newsletter September, 18th, 2009

[cyprinodontiformes viviparos.com]

Acabadinha de chegar ( há menos de 20 minutos ),

 

Aqui fica mais uma " newsletter " desta vez com uma atracção especial...
Xenotoca variata.

Como não tenho muito espaço e sigo há vários anos uma política que consiste
em não juntar no mesmo local duas espécies do mesmo género... desta vez
passo... senão aí vinha uma encomenda a caminho.

Não sendo tão tolerante ao frio como a Xenotoca eiseni e mais canibal para
com os recém-nascidos, aconselho vivamente esta espécie a quem possua um
aquário não aquecido, com mais de 70 litros, em casa e ainda não tenha
decidido que espécie lá colocar.

 

Um abraço

 

Miguel 

 

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De: Aquarium Glaser GmbH [mailto:info  aquariumglaser.de] 
Enviada: sábado, 19 de Setembro de 2009 01:01
Para: cyprinodon  clix.pt
Assunto: [Provavel SPAM] Aquarium Glaser Newsletter September, 18th, 2009

 


 
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A new Panchax from Manipur

 
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Manipur-Panchax, male

After the spectacular importation of the new gourami from Manipur
(http://www.aquarium-glaser.de/en/colisa-cf-fasciata-_en_1115.html) now we
were able to import a beautiful new Panchax from this state in northern
India. Currently only one species is accepted formally within this
species-group, eg Aplocheilus panchax. This species is distributetd from
China over great parts of India, Burma, and Indochina (Thailand, Vietnam,
Cambodia, Laos), as well as over Indonesia. Of course fish from different
origin look very different and so it is more than likely, that there do
exist a lot of species and not only one. The new Panchax from Manipur also
represents such a different form. It is distinguished from typical A.
panchax by many red spots on the body, bright orange fins, and a dark band
that is shown when the fish feel disturbed.

 
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Manipur-Panchax, female

Initially, Aplocheilus panchax has been described from Bengal. We also have
regular importations from there. These fish are characterized by a
polychromatism. Within one population are white-finned and orange-finned
males. The females all look the same. Red spots on the body are never
present in typical A. panchax. Males and females can be distinguished easily
by the different shape of the anal fin, which is shorter and rounded in
females. Breeding is very easy, A. panchax is an egglaying fish.

 
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Calcutte-Panchaxes, males, blue and orange

The Panchax is an ideal fish for community tanks where it lives near the
surface. Tankmates should not be too small, otherwise they are eaten. The
Panchax takes readily any usual fishfood, even flakes. The new Panchax from
Manipur should not be kept too warm throughout the year, for they originate
from mountain regions. Temperature easily falls as low as 15°C there. On the
other hand the shallow waters that are preferably inhabited by the species
can warm up very quickly to 30°C and even more on sunny days.

 
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Calcutta-Panchax, female

Text & photos: Frank Schäfer

Lexicon: Aplocheilus: means "with a simple lip", refers to the mouth
structure. panchax: from the Bengal name for the species. Polychromatism:
means "with many colours". The term is used when within one species
different colorations are observed.

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A new L-catfish!

 
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Last week we were able to import a new yellow seam pleco belonging to the
genus Baryancistrus. The fish originate from Sao Felix at the Rio Xingu.
They differ from all other members of the genus from there (L18, L47, L81,
L85, L177) by the almost black ground colour of the body. Almost no spots
are present. 

 
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Only one of our 20 specimens - the smallest one - has very tiny white spots.
Our animals are 8 - 10 cm long, but it is very likely that they grow up to a
length of 25 - 30 cm like all their relatives from the Rio Xingu.

 
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Lexicon: Baryancistrus: means "sturdy Ancistrus" referring to the body
structure.

Text & photos: Frank Schäfer

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Xenotoca variata - Jeweled splitfin

Only few species of splitfin (Goodeidae) have become established aquarium
fish, despite the fact that they are perfectly suited for keeping and
breeding in tanks. Many species are in danger of extinction in the wild, for
they inhabit only very small areas and habitat destruction can easily wipe
out complete species. Species conservation via breeding programs in aquaria
have been successful in some species, nevertheless these breeding programs
would be much easier to do if more people would keep the fish.

 
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However, Xenotoca variata is not one of the endagered species of splitfin.
Nevertheless it is only rarely seen in aquaria. In this special case it is
very likely that this is due the fact that males get their full colour only
relatively late. This phenomenon is also well known from many species of
rainbow fishes.

Xenotoca variata are kept best in groups. Here the fish establish a
hierarchy that enables exciting studies of behaviour. It is important to
feed a lot of plant material to the fish beside their normal food. These
fishes are livebearers. Sadly they hunt their own offspring quite violently.
So it is best to seperate the female some days before it gives birth in an
extra tank.

 
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In nature these fish are exposed to heavy temperature changes. It is
recommended to shift the heater along with the light in the aquarium. So the
fish get slight temperature changes during the day and night rhythm. This
makes the fish healthy and gives them longevity. Hard and slightly alcalic
water is best, but the fish are very tolerant to different water contitions.
Temperature tolerance is between 16 and somewhat above 30°C. During summer
the fish can be kept in the garden pond in central Europe. The fish that
come out of such a gardenpond in autumn are extremely colorful and strong.

Lexicon: Xenotoca: means "with strange young", refering to the "umbilical
cord" (the correct term is "trophotaenia") of the newborn youngsters.
variata: means "changeable".

Text & photos: Frank Schäfer  

 

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