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• Rev. Bras. Zool. 16 (suppl 2) • 1999 • https://doi.org/10.1590/S0101-81751999000600017   copiar

Biologia reprodutiva dos bagres marinhos Genidens genidens (Valenciennes) e Cathorops spixii (Agassiz) (Siluriformes, Ariidae), na Baía de Sepetiba, Rio de Janeiro, Brasil

Reproductive biology of the marine catfish Genidens genidens Valenciennes and Cathorops spixii Agassiz (Siluriformes, Ariidae) in the Sepetiba Bay, Rio de Janeiro, Brazil

Autoria SCIMAGO INSTITUTIONS RANKINGS

Resumo

The reproductive cycle of the marine catfishes Genidens genidens Valenciennes, 1833 and Cathorops spixii Agassiz, 1839 in the Sepetiba Bay, was assessed by an annual period of sampling from October 1993 to September 1994. The fishes were caught by standardized otter trawl and environmental parameters of temperature, salinity and transparency of water were recorded at each sampling. Five gonadal phases were described, based in macroscopic observations. Changes in the gonadosomatic index (GSI) and in the percentual of stages of gonadal development showed that G. genidens spawns in Summer/early Autumn, coinciding with low salinity and high temperature and transparency. Cathorops spixii spawns in late Spring/early Summer, coinciding with rising temperature and transparency and low salinity. Total spawning are shown for both species, as indicated by length-frequency of oocytes per stages of maturation with two groups synchronic development of oocytes. Fecundity is low (10-23 oocytes, for G. genidens and 24-30 for C. spixii), when compared with other teleosteans, and was not strongly correlated to the total length (G. genidens, r=0.65, C. spixii, r=0.76). Strategy-k is developed by both species as indicated by high brood and enbrions protection and high body length.

Siluriformes; Ariidae; reproduction; Marine Catfish; Sepetiba Bay

Siluriformes; Ariidae; reproduction; Marine Catfish; Sepetiba Bay

Biologia reprodutiva dos bagres marinhos Genidens genidens (Valenciennes) e Cathorops spixii (Agassiz) (Siluriformes, Ariidae), na Baía de Sepetiba, Rio de Janeiro, Brasil

Reproductive biology of the marine catfish Genidens genidens Valenciennes and Cathorops spixii Agassiz (Siluriformes, Ariidae) in the Sepetiba Bay, Rio de Janeiro, Brazil

Iracema David Gomes; Francisco Gerson Araújo; Marcia Cristina Costa de Azevêdo; André Luiz Machado Pessanha

Laboratório de Ecologia de Peixes, Posto de Aquicultura, Universidade Federal Rural do Rio de Janeiro. Antiga Rodovia Rio-São Paulo, Km 47, 23851-970 Seropédica, Rio de Janeiro, Brasil. E-mail: gerson@ufrrj.br

ABSTRACT

The reproductive cycle of the marine catfishes Genidens genidens Valenciennes, 1833 and Cathorops spixii Agassiz, 1839 in the Sepetiba Bay, was assessed by an annual period of sampling from October 1993 to September 1994. The fishes were caught by standardized otter trawl and environmental parameters of temperature, salinity and transparency of water were recorded at each sampling. Five gonadal phases were described, based in macroscopic observations. Changes in the gonadosomatic index (GSI) and in the percentual of stages of gonadal development showed that G. genidens spawns in Summer/early Autumn, coinciding with low salinity and high temperature and transparency. Cathorops spixii spawns in late Spring/early Summer, coinciding with rising temperature and transparency and low salinity. Total spawning are shown for both species, as indicated by length-frequency of oocytes per stages of maturation with two groups synchronic development of oocytes. Fecundity is low (10-23 oocytes, for G. genidens and 24-30 for C. spixii), when compared with other teleosteans, and was not strongly correlated to the total length (G. genidens, r=0.65, C. spixii, r=0.76). Strategy-k is developed by both species as indicated by high brood and enbrions protection and high body length.

Key words: Siluriformes, Ariidae, reproduction, Marine Catfish, Sepetiba Bay.

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Recebido em 27.V.1998; aceito em 19.XI.1999.

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Datas de Publicação

  • Publicação nesta coleção
    04 Jun 2009
  • Data do Fascículo
    1999

Histórico

  • Aceito
    19 Nov 1999
  • Recebido
    27 Maio 1998
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