Karyotypes of three species of marine catfishes from Brazil

ARTIGOS

Karyotypes of three species of marine catfishes from Brazil

Vicente Gomes; Phan Van Ngan; Maria José de Arruda Campos Rocha Passos

Instituto Oceanográfico da Universidade de São Paulo (Caixa Postal 66149, 05389-970, São Paulo, SP, Brasil)

ABSTRACT

The chromosomes of three species of fishes belonging to the family Ariidae -Netuma barba, Genidens genidens and Amis parkeri - were studied after conventional Giemsa staining. All three species have a diploid chromosome number of 2n = 56. The karyotype comprises 18 metacentric (m), 18 submetacentric (sm), 18 subtelocentric (st) and 2 telocentric (t) pairs for N. barba; 12 m, 20 sm, 20 st and 41 pairs for G. genidens; 16 m, 16 sm, 22 st and 21 pairs for A. parkeri. The results obtained from these three species are compared with each other and with those found in literature.

Descriptors: Chromosome, karyotype, Siluriformes, Ariidae.

RESUMO

Os cromossomos de 3 espécies de peixes da família Ariidae - Netuma barba, Genidens genidens e Arius parkeri - foram estudados após coloração convencional com Giemsa. As três espécies apresentaram número modal diplóide de 2n = 56. O cariótipo de N. barba compreende 18 pares de cromossomos metacentricos (m), 18 submetacêntricos (sm), 18 subtelocêntricos (st) e 2 telocêntricos (t); o de G. genidens compreende 12 pares m, 20 sm, 20 st e 41; o de A.parkeri compreende 16 m, 16 sm, 22 st e 2 t. Os resultados obtidos são comparados entre si e com os de outros ariídeos encontrados na literatura.

Descritores: Cromossomos, cariótipo, Siluriformes, Ariidae.

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Acknowledgments

This work was supported by grant from "Fundação de Amparo à Pesquisa do Estado de São Paulo - FAPESP" (81/1821-5) and "Conselho Nacional de Desenvolvimento Científico e Tecnológico - CNPq" (104243-83; 300299/77).

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(Manuscript received 12 May 1993, revised 24 May 1994, accepted 1 June 1994)

Publication Dates

• Publication in this collection
  14 May 2012
• Date of issue
  1994

History

• Accepted
  01 June 1994
• Reviewed
  24 May 1994
• Received
  12 May 1993