[Cyprinodontiformes] Aquarium Glaser Newsletter June, 26th 2009

Segunda-Feira, 29 de Junho de 2009 - 23:23:24 WEST

Prezados colegas,

Mais algumas curiosidades interessantes... mas ainda não são espécies ou
variedades dos nossos Cyprinodontiformes vivíparos e ovovivíparos. 

Há contudo nesta “ newsletter “ sem dúvida muitos motivos para qualquer
aquariofilista ficar interessado e sobretudo contactar o respectivo
importador nacional se for caso disso.

Um abraço a todos

Miguel Andrade

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De: Aquarium Glaser GmbH [mailto:info  aquariumglaser.de] 
Enviada: sábado, 27 de Junho de 2009 01:01
Para: cyprinodon  clix.pt
Assunto: [Provavel SPAM] Aquarium Glaser Newsletter June, 26th 2009

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Laetacara sp. „Buckelkopf“ described scientifically

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Laetacara sp. „Buckelkopf“ is known in the hobby for many years already. The
somewhat unusal common name (the German word „Buckelkopf“ means „humphead“)
derives from the feature developed by some very old males, but this happens
rather seldom. It is a typical dwarf cichlid, the males grow to a length of
about 8, the females of about 6 cm. The typical open brooders with
biparental care are easy to keep and breed.

Now the species has been formally described by F. P. Ortoni and W. J. E. M.
Costa as Laetacara araguaiae. According to the authors the species comes
from the Rio Verde in the Rio Araguaia drainage. However, aquarium
literature gives a much wider distrubition, namely the southeastern
tributaries of the Amzon river from the Tapajos to the mouth of the Amazon
and also the Xingu river.

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So finally the second species of Laetacara that had to be named
provisionally by aquarists (Laetacara sp. „Orangefin“ has been described
already in 2007 by W. Staeck and I. Schindler as L. fulvipinnis) has valid a
scientific name.

Interstingly the authors obviously inteded to describe a further species of
Laetacara and by mistake in two occasions this species is mentioned under
the name L. minuatacara (pp. 45 and 46) in the paper. However, this name
remains a nomen nudum without any validity, but clearly shows that we can
expect more new species in this interesting genus.

The original papers can be downloaded for free as pdf-files from
http://globiz.sachsen.de/snsd/publikationen/vertebrate-zoology/vz57-1/57-1_S
taeck_63-71.pdf for L. fulvipinnis and
http://globiz.sachsen.de/snsd/publikationen/vertebrate-zoology/vz59-1/05_Ver
tebrate_Zoology_59-1_Costa_03.pdf for L. araguaiae.

All Laetacara species are illustrated in Aqualog Southamerican Cichlids III,
which can be ordered here:
http://www.animal-book.de/shop/product_info.php/language/en/info/p4_Southame
rican-Cichlids-III.html

Text: Frank Schäfer, photos: H. J. Mayland, Aqualog archieves

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Boraras maculatus 

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The Dwarf rasbora  (Boraras maculatus, formerly known as Rasbora maculata)
is the species of genus Boraras (which currently comprises five species, all
of them will become presented in the upcoming days) that is known for the
longest time in the hobby. None of these species grows bigger than 2-3 cm
and thus they are perfect candidates for the so-called nano-aquaria. All
like to be kept in soft and acidic water, rather dark tanks, that should
nevertheless be well planted (best use swimming plants), fine live food
(although they also take readily dried food) and company of their own kind.

The Dwarf rasbora inhabits the malayian peninsula, southern Thailand and
Sumatra. Initially it was often thought to represent the juvenile of the
much larger growing species Rasbora kalochroma, but observations of the fish
in aquaria and their successful breeding left no doubt on the validity of
the species.

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There do exist lots of varieties of the Dwarf rasbora which may proof to be
different species one day. Typical for all of them is the large shoulder
spot, which is in any cases bigger than the eye. The ground coloration of
the body depends on the variety and can be light orange up to deep red. Some
populations have an additional black spot (all Dwarf rasboras have three
black blotches: one on the shoulder, one on the origin of the anal fin, and
one on the caudal fin base) on the beginning of the caudal peduncle right
above the anal fin.

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Text and photos: Frank Schäfer 

Lexicon: Boraras: anagram  of Rasbora, referring to the reverse ratio of
abdominal and caudal vertebrae in Boraras compared with Rasbora. Maculatus:
Latin word for „Spotted“

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Boraras urophthalmoides 

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As early as 1914 the then very prominent German aquarist J. P. Arnold
illustrated a new species of Rasbora in a German aquarium magazine, imported
by the company Scholze & Pötzsche and said to be imported from Sumatra. In
1922 E. Ahl from Berlin Museum described this species scientifically as
Rasbora urophthalma and since these days this charming dwarf rasbora is
known as R. urophthalma  (common name: Least rasbora) in the aquarium hobby.
In 1991 M. Kottelat found when re-examining Ahl´s specimens in Berlin Museum
that they were not identical with what is well known in the hobby. Thus the
name Rasbora urophthalma was not available anymore for the Least rasbora and
Kottelat gave a new name on them: Rabora urophthalmoides. He also stated
that the Least rasbora is not known from Indonesia.

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Today the scientific name for the Least rasbora is Boraras urophthalmoides.
It is known from Thailand, Cambodia, and Vietnam. For the aquarium hobby, it
is imported mainly from the latter country. 

Like all dwarf rasboras this species is best kept in small aquaria in a
one-species tank. The water should be soft and acidic. Due to it´s origin
for regular keeping temperatures of 20-22°C are enough, but for breeding the
temperature should be raised to 26-28°C.

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For our customers: the species has code 453001 on our stocklist. Please note
that we exclusively supply to the wholesale market.

Text & photos: Frank Schäfer

Lexicon: urophthalmoides: somewhat like urophthalma; urophthalma: from
ancient Greek oura: tail and ophthalmos: eye, referring to the tailspot of
the species.

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Boraras brigittae and B. merah

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Dieter Vogt described in 1978 a subspecies of Rasbora urophthalma (please
see the entry for Boraras urophthalmoides in our fisharchives) from Borneo.
He named the fish Rasbora urophthalma brigittae, a dedication name in honour
for his wife Brigitte. The German name is „mosquito rasbora“. This is not
because the fish are as tiny as mosquitos or as red as moskitos after having
a dinner, but due to the fact that there were so many mosquitos at the
collecting site that fishing became a real pain.

Today the mosquito rasbora is regarded as a full species in Boraras and thus
the correct name is Boraras brigittae.

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Boraras brigittae was found initially in Banjarmasin in the South of Borneo.
1991 another dwarf rasbora was discovered, also in the South of Borneo, but
about 400 km further in the west. This new dwarf rasbora is distinguished
from all other species known so far by the very large shoulder spot with a
golden ring. It was described by M. Kottelat as Rasbora merah and its
correct name today is Boraras merah.

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Interestingly B. brigittae also occurs in some of the habitats of B. merah.
The population of B. brigittae found there is distinguished from those from
the type locality by the much narrower stripe along the side. Depending on
which species is dominating a peculiar habitat one imitates the other in
coloration. For example: if more B. merah live in the habitat B. brigittae
changes coloration so much that one has to look very close on the individual
fish to be able to distinguish them. In aquaria both species can interbreed.
It is unknown if they do this in the wild.

Obviously this is a case of speciation occuring directly before our eyes!

For our customers: B. brigittae has code 451102, B. merah 452752 on our
stocklist. Please note that we exclusively supply to the wholesale market.

Text & photos: Frank Schäfer

Lexicon: merah: after the indonesian word for „red“; allusion to the ground
colour of the species.

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...and please do not forget to visit our homepage
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