Effectiveness of estradiol valerate on sex reversion in Astyanax altiparanae (Characiformes, Characidae)
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چکیده
منابع مشابه
First report of a B chromosome in a natural population of Astyanax altiparanae (Characiformes, Characidae)
Several species of the genus Astyanax have already been genetically studied, and B-chromosomes have been considered to be an interesting feature in some species of this group. In the present paper we report, for the first time, the occurrence of a B microchromosome in a natural population of A. altiparanae. This additional genomic element was identified as an acrocentric chromosome, similar in ...
متن کاملComparative cytogenetics among populations of Astyanax altiparanae (Characiformes, Characidae, Incertae sedis)
Cytogenetic data are presented for Astyanax altiparanae populations from three Brazilian hydrographic systems. The chromosomal data obtained in A. altiparanae support the hypothesis of diploid number conservation. However, small differences in the karyotype formula and number of nucleolar organizer regions were observed in these populations. The apparent karyotypical similarity among the studie...
متن کاملMolecular study of Astyanax altiparanae (Osteichthyes, Characidae) as a probable species complex.
Astyanax altiparanae, belonging to the bimaculatus group, which includes species with similar colors and morphology, occurs in the upper Paraná River basin. As the use of mitochondrial DNA has made great strides in the diagnosis of species, in previous researches, two strains were detected in A. altiparanae with a high divergence in the D-loop region, provisionally called AltoPR and AltoPR-D. E...
متن کاملReproductive traits and population structure of Astyanax aeneus (Characiformes: Characidae) from a subtropical river in Mexico.
Champotón River is an unknown area within the Mesoamerican hotspot in Southestern México. Reproductive traits and population structure of Astyanax aeneus were analyzed along an environmental gradient of the upper, middle and lower sections of the river, where diverse environmental factors were recorded. For this, nets were cast for 1 h at each site and A. aeneus were collected from all sections...
متن کاملA new species of Astyanax from headwater streams of southern Brazil (Characiformes: Characidae).
Astyanax pirabitira, new species, is described from the upper portion of the rio das Antas, laguna dos Patos system, and from the rio Pelotas, upper rio Uruguay drainage, Rio Grande do Sul State, Brazil. The new species belongs to the A. scabripinnis species complex and differs from its congeners by a combination of characters, viz., body depth (27.1-34.0% of standard length), narrow interorbit...
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ژورنال
عنوان ژورنال: Brazilian Archives of Biology and Technology
سال: 2012
ISSN: 1516-8913
DOI: 10.1590/s1516-89132012000200015