Full text in pdf format

Chromosome complement of induced hybrids of the fish Prochilodus marggravii and Prochilodus affinis (Prochilodontidae, Characiformes)

Pedro Manoel Galetti Junior

Departamento de Ciências Biológicas, Universidade Federal de São Carlos, 13560 São Carlos, SP, Brasil

ABSTRACT

A study was conducted on the mitotic chromosomes of hybrid fish resulting from induced crosses between Prochilodus marggavii and P. affinis. Preparations were obtained from kidney cells and submitted to standard Giemsa staining and to silver staining for the identification of nucleolar organizer regions. All hybrids analyzed had 2n = 54. The homeologous elements of the complement were practically identical, thus preventing the identification of clear markers of the parental species. The high degree of genetic and cytological compatibility is probably the decisive factor in the success of hybridization.

Keywords: Chromosome; Hybrids; Prochilodus marggravii; Prochilodus affinis; Characiformes.

REFERENCES

Almeida Toledo, L.F., Foresti, F., Ramos, S.M., Ormanezi, R., Carolsfeld, V.J.S. and Toledo Fo., S.A. (1988). Estudos citogenéticos de híbridos entre fêmeas de pacu (Piaractus mesopotamicus)e machos de tambaqui (Colossoma macropomum). B. Téc. CEPTA 1: 11-17.

Bertollo, L.A.C., Takahashi, C.S. and Moreira-Filho, O. (1978). Cytotaxonomic considerations onHoplias lacerdae (Pisces, Erythrinidae). Brazil. J. Genetics 1: 103-120.

Britski, H.A., Sato, Y. e Rosa, A.B.S. (1984). Manual de Identificação de Peixes da Região de Tres Marias. Câmara dos Deputados/CODEVASF, Brasília.

Howell, W.M. and Black, D.A. (1980). Controlled silver-staining of nucleolus organizer regions with a protective colloidal developer: a 1-step method. Experientia 36: 1014-1015.

Pauls, E. (1985). Considerações sobre a evolução cromossômica e sistema de cromossomos supranumerários em espécies do gênero Prochilodus (Pisces, Prochilodontidae). Doctoral Thesis. Departamento de Ciências Biológicas, Universidade Federal de São Carlos.

Sato, Y., Cardoso, E.L., Capuchinho, S.A. and Oliveira, J.S. (1985). Nota preliminar sobre hibridação entre Prochilodus marggravii e Prochilodus affinis, da Bacia do São Francisco. Encontro Anual de Aquicultura de Minas Gerais. Abstract 4: 74.