Natural genetic polymorphism and phylogeography of Siberian sturgeon Acipenser baerii Brandt, 1869.

Russ. J. Genet. 53: 358–368. https://doi.org/10.1134/S1022795417030024

Abstract:

Five populations of Siberian sturgeon Acipenser baerii collected throughout the species distribution range (Lake Baikal, Lena, Yenisei, Kolyma, and Irtysh rivers) were examined for genetic polymorphism using five tetraploid microsatellite loci and the mitochondrial DNA control region. It was demonstrated that Siberian sturgeon was represented by genetically well-differentiated groups that corresponded to hydrographic basins, Ob–Irtysh, Baikal–Yenisei, Lena, and Kolyma. Population assignment of the Siberian sturgeon broodstock should be considered in the restocking programs.

barmintseva-biblio

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A phylogenetic analysis of Brycon and Henochilus (Characiformes, Characidae, Bryconinae) based on the mitochondrial gene 16S rRNA.

Genetics and Molecular Biology, 31 (1,  suppl): 366-371

Abstract:

The genus Brycon, the largest subunit of the Bryconinae, has 42 valid species distributed from southern Mexico to the La Plata River in Argentina. Henochilus is a monotypic genus, comprising a single species (H. wheatlandii) found in the upper Rio Doce basin. In the present study, partial sequences of the mitochondrial gene 16S were obtained for fifteen species of Brycon and for Henochilus wheatlandii. The results showed that the genus Brycon is paraphyletic, since Henochilus is the sister-group of B. ferox and B. insignis. The most basal species analyzed were the trans-Andean species B. henni, B. petrosus, and B. chagrensis.

wagner-biblio

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The endangered species Brycon orbignyanus: genetic analysis and definition of priority areas for conservation.

Environ Biol Fish 98: 1845–1855. https://doi.org/10.1007/s10641-015-0402-8

Abstract:

Currently, biodiversity is threatened by several factors often associated with human population growth and the extension of areas occupied by human activity. In particular, freshwater fish fauna is affected by overfishing, deforestation, water pollution, introduction of exotic species and habitat fragmentation promoted by hydroelectric dams, among other environmental impact factors. Several action plans to preserve ichthyofauna biodiversity have been adopted; however, these plans frequently cover only a small number of species, and decisions are often made without strong scientific support. This study aimed to evaluate the genetic aspects of wild groups of Brycon orbignyanus, an endangered fish species, using microsatellites and D-loop regions to identify the genetic structure of the samples and to establish priority areas for conservation based on the genetic patterns of this species. The results indicated that the samples showed levels of genetic variability compatible with others studies with Neotropical fishes. However, the results obtained in the analysis of molecular variance (AMOVA) for microsatellites (F ST = 0.258) and D-loop (F ST = 0.234) and the interpopulation fixation index revealed that B. orbignyanus was structured in different subpopulations in the La Plata River basin; the areas with better environmental conditions also showed subgroups with higher rates of genetic variability. Future conservation actions addressing these sites should consider two different management units: the complex formed by the Ivinhema River, Upper Paraná, Camargo Port and Ilha Grande groups; and the complex formed by the Verde River and Sucuriu River groups.

ashikaga-biblio

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Montag, 04 Oktober 2021 11:53

MORITZ, T. & BRITZ, R. (2019)

Revision of the extant Polypteridae (Actinopterygii: Cladistia).

Ichthyological Exploration of Freshwaters. July 2019: 1-96. DOI:10.23788/IEF-1094

Abstract:

The species-level taxonomy of all extant members of the family Polypteridae is revised. Two genera are recognised: Polypterus and the monotypic Erpetoichthys. Thirteen species of Polypterus are regarded as valid: P. bichir (type species), P. ansorgii, P. congicus, P. delhezi, P. endlicherii, P. mokelembembe, P. ornatipinnis, P. palmas, P. polli, P. retropinnis, P. senegalus, P. teugelsi and P. weeksii. Polypterus lapradei and P. bichir katangae are considered junior synonyms of P. bichir. Polypterus senegalus meridionalis is synonymized with P. senegalus, and P. buettikoferi and P. retropinnis lowei are regarded as junior synonyms of P. palmas. Lectotypes of P. ansorgii, P. congicus and P. delhezi are designated. Distribution maps for each species are compiled and a key for all species of Polypteridae is provided.

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First observation of Salaria fluviatilis in Lake Geneva / Premier signalement de Salaria fluviatilis dans le lac Leman.

Cybium, International Journal of Ichthyology 34(4): 401-402.

Abstract :

En mai 2010, une campagne de pêches électriques dans trois secteurs littoraux espacés de plusieurs dizaines de kilomètres le long de la rive française du lac Léman a abouti à la capture systématique de blennies fluviatiles, Salaria fluviatilis (Asso,1801), dont c'est le premier signalement dans le lac.

In May 2010, a fishing campaign by electricity on three distant sites along the French side of the lake Geneva provided regular catches of freshwater blennies, Salaria fluviatilis (Asso, 1801). This is the first record of the species in this lake.

raymond-biblio

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Diversity of Fish Fauna in Gediz Estuary Lagoons (Izmir Bay/Aegean Sea).

Journal of Animal and Veterinary Advances 7 (9):1146-1150). ISSN: 1680-5593.

Abstract:

In order to establish the present fish fauna in Gediz estuary lagoons, sampling was conducted in the 4 stations, one inside Gediz river mouth and 3 in the lagoons during 2004. In the first station, a commercial trawling with 44 mm codend mesh size to determine fish fauna was used and sub marine observations or beach seine of 1 mm mesh size employed to establish fish fauna in the lagoons, K rdeniz, Homa and Çilazmak, which are relatively shallow. In addition some physicochemical parameters such as temperature, salinity, dissolved oxygen, pH and chlorophyl-a which all play significant roles were measured for each stations monthly. As the result of the research, 56 fish species of 24 families were found from the 4 stations. According to a Bray-Curtis similarity index and multi dimensional scaling analysis in relation to the lagoons, 2 groups are formed based on diversity of fish fauna; Krdeniz, Homa and Çilazmak are similar to one another in diversity of species, with the first station being different from them.

bayan-biblio

Freigegeben in B
Freitag, 16 April 2021 07:05

DE KOCK, S. & GOMELSKY, B. (2015)

Japanese Ornamental Koi Carp: Origin, Variation and Genetics.


In: PIETSCH, C. & HIRSCH, P. (eds., 2015) Biology and Ecology of Carp. Kapitel 2: 27-53. DOI:10.1201/b18547-4.

Einleitung:

The ornamental form of the carp, Cyprinus carpio L., provides a rich source of investigation for science and commercial possibilities alike. For researchers, however, there is also the challenge of cultural and language barriers that add a dimension of the mystic. On the other hand, many koi hobbyists and professionals are not familiar with published scientific information on koi genetics. This chapter intends to better equip all kinds of readers with an understanding of the origin, variationand genetics of koi.This chapter was written collectively by a koi professional and writer, who has run a large koi farm and authored several books on koi keeping (De Kock and Watt 2006), and a fish geneticist, who has studied inheritance of different traits in koi for 20 years.

de kock-biblio

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Mittwoch, 07 April 2021 08:31

LOISELLE, P. V. (2006)

A review of the Malagasy Pachypanchax (Teleostei: Cyprinodontiformes, Aplocheilidae), with descriptions of four new species.

Zootaxa 1366: 1–44. ISSN 1175-5334 (online edition)

Abstract:

The history of the genus Pachypanchax Myers, 1933 in the literature is reviewed and the utility of
the diagnostic characters proposed by various authors is evaluated. On the basis of five
synapomorphies, four skeletal and one squamational, six of the seven presently known Malagasy
aplocheilids are found to be unambiguously referable to the genus Pachypanchax. The seventh,
Poecilia nuchimaculata Guichenot 1866, known only from the unique type specimen, displays
several peculiar skeletal and squamational features. Pending the acquisition of additional material,
it is tentatively assigned to the genus. Of the six species treated here, Pachypanchax omalonotus
(Duméril, 1861) and P. sakaramyi (Holly, 1828) are redescribed from recently collected topotypical
material; and the following four are described as new: P. varatraza., P. patriciae, P. sparksorum,
and P. arnoulti. Data on life colors, distribution, natural history and conservation status on all six
Malagasy Pachypanchax species are presented.

loiselle-biblio

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Samstag, 19 Dezember 2020 14:37

BECKMANN-DAHL, R. (2019)

The Sandy Zebra Shark: A New Color Morph of the Zebra Shark Stegostoma tigrinum, with a Redescription of the Species and a Revision of Its Nomenclature.

Copeia, 107(3):524-541 (2019). https://doi.org/10.1643/CG-18-115

Abstract:

The Zebra Shark, in recent years known as Stegostoma fasciatum (Hermann, 1783), is well known for its dramatic ontogenetic change of color pattern, from striped (“zebra”) juveniles to spotted (“leopard”) adults. Nevertheless, many aspects of the species' biology, ecology, and morphology are still unknown or inadequately described, and its nomenclature is contentious. This study introduces a hitherto undescribed color morph of the Zebra Shark and provides an updated diagnosis and redescription of the species. Firstly, we establish that the Zebra Shark remains a single species based on genetic data from mitochondrial COI and ND4 markers. Secondly, through morphological analyses, we conclude that there are two morphs of the species, the known, zebra striped morph and a new, sandy colored morph. Both morphs were studied morphometrically to expose any ontogenetic changes, such as a decrease in the relative length of the tail with increasing total length (TL). The external coloration pattern clearly differentiates the two morphs, and both morphs can be further divided into three stages based on color pattern and size: juveniles (255–562 mm TL), transitionals (562–1395 mm TL), and adults (>1300 mm TL). The transitional sandy morph is dorsally covered by a swirly pattern of thin, dark brown bands edged with freckle-like brown spots. The adults are a uniform sandy beige, partially covered with brown freckles. A mature male of the zebra morph displayed a yet unknown feature of the claspers: a small, triangular spike extruding from the dorsal terminal of the clasper glands. Finally, we reviewed the nomenclature of the species and suggest that the original name Stegostoma tigrinum Forster, 1781, should be used as the senior synonym for the species.

beckmann-biblio

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Mittwoch, 02 September 2020 15:33

MILLER, C. (2020)

Der Aal - ein geheimnisvoller Wanderer.

FAUNA FOCUS Nr. 61. 12 Seiten.
Hrsg.: WILDTIER SCHWEIZ

Verlagstext:

Der europäische Aal ist ein Fisch der Rekorde: Er ist die am weitesten verbreitete Fischart Europas, gleichzeitig zählt er heute zu den am meisten gefährdeten Fischen. Er legt die weitesten Wanderungen zu seinen Laichgewässern zurück. Und schliesslich zählt er zu den geheimnisvollsten Fischarten.
Der aussergewöhnliche Lebenswandel der Aale macht es überaus schwierig sie zu erforschen: Wanderfische, die ihren Laich im Salzwasser ablegen und ihre Fress- und Wachstumsphase im Süsswasser verbringen, gibt es nur wenige. Die meisten wandernden Fische, wie Lachse und Meerforellen, leben im Salzwasser und laichen im Süsswasser.

Weltweit gibt es rund 20 Aalarten, von welchen die meisten weite Wanderungen zurücklegen. Bis heute ist es jedoch nicht gelungen die genauen Wanderrouten auch nur einer Aalart genau nachzuvollziehen. Sobald sie die Küstengewässer hinter sich lassen und in tiefere Meeresschichten abtauchen verliert sich ihre Spur.

miller-biblio

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