fish cytogenetics

Occurrence of natural triploidy in Rhamdia quelen (Siluriformes, Heptapteridae)

J. R. Tsuda, de Moraes, V. P. O., Giuliano-Caetano, L., and Dias, A. L., Occurrence of natural triploidy in Rhamdia quelen (Siluriformes, Heptapteridae), vol. 9, pp. 1929-1935, 2010.

Five specimens of Rhamdia quelen collected from the Lindóia Stream, PR, Brazil, were cytogenetically analyzed. The diploid chromosome number found was 58, including 30 metacentric, 16 submetacentric, 10 subtelocentric, and 2 acrocentric chromosomes. Supernumerary or B chromosomes, frequently observed in this fish group, were not detected. One of the individuals was triploid, with 3n = 87.

Cytogenetic studies in Brazilian marine Sciaenidae and Sparidae fishes (Perciformes)

I. V. Accioly and Molina, W. F., Cytogenetic studies in Brazilian marine Sciaenidae and Sparidae fishes (Perciformes), vol. 7, pp. 358-370, 2008.

Fishes from the families Sciaenidae and Sparidae, the former comprising coastal species associated with shallow waters on the continental shelf and the latter composed of typically marine species, are of significant economic value. Karyotypic data are available for about 20% of the total number of species in these groups.

Karyoevolution of the toadfish Thalassophryne nattereri (Batrachoidiformes: Batrachoididae)

G. W. W. F. Costa and Molina, W. F., Karyoevolution of the toadfish Thalassophryne nattereri (Batrachoidiformes: Batrachoididae), vol. 8, pp. 1099-1106, 2009.

The Batrachoididae includes some venomous brackish and marine fish found in the Atlantic, Indian and Pacific oceans. This family is composed of 69 species, distributed among 19 genera. Species of the genus Thalassophryne have been reported along the coast of Rio Grande do Norte (Brazil); T. nattereri has been responsible for a large number of human injuries. Little is known about the cytogenetic features of this family. We made a karyotypic characterization of T.

Robertsonian rearrangements and pericentric inversions in Scaridae fish (Perciformes)

D. C. S. Sena and Molina, W. F., Robertsonian rearrangements and pericentric inversions in Scaridae fish (Perciformes), vol. 6, pp. 575-580, 2007.

The parrotfishes (family Scaridae) are comprised of the subfamilies Sparisomatinae and Scarinae. They are important agents of marine bioerosion, which rework the substrate with their beaklike jaws. Despite their importance, there are no published cytogenetic data on this group. We made cytogenetic analyses of Sparisoma axillare (Sparisomatinae) and Scarus coelestinus (Scarinae) from the Brazilian coast. Differentiation in the diploid number in S.

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