Biologia reprodutiva de três espécies simpátricas de peixes neotropicais: Pimelodus maculatus Lacépède (Siluriformes, Pimelodidae), Leporinus amblyrhynchus Garavello & Britski e Schizodon nasutus Kner (Characiformes, Anostomidae) do recém-formado Reservatório de Miranda, Alto Paraná

Reproductive biology of three simpatric species of Neotropical fishes: Pimelodus maculatus Lacépède (Siluriformes, Pimelodidae), Leporinus amblyrhynchus and Schizodon nasutus Kner (Characiformes, Anostomidae) from the newly formed Miranda Reservoir, High Paraná Basin

Volney Vono Luiz Gustavo M. Silva Bruno P. Maia Hugo P. Godinho Sobre os autores

The reproductive activity parameters of the teleosts Pimelodus maculatus Lacépède, 1803, Leporinus amblyrhynchus Garavello & Britski, 1987 and Schizodon nasutus Kner, 1859 was evaluated at a newly formed reservoir in the Araguari River, Paraná River basin, Southeast Brazil. The fishes were captured by gill nets bimonthly from November 1997 to November 1998 at three sampling stations. The stages of gonad development were identified macroscopically in the field and then confirmed by histological analysis in the laboratory. The females of all species reached larger standard length than the males. Pimelodus maculatus in reproductive activity were captured only in November, 1997 and January, 1998 whereas L. amblyrhynchus and S. nasutus were in activity throughout the year. The gonadosomatic index reached the peak during the advanced maturation stage in all species, but the hepatosomatic index and coelomic fat index exhibited distinct tendencies. Length at first maturity was 9.5 cm SL for amblyrhynchus females and 17.1 and 13.0 cm SL, respectively, for S. nasutus females and males. L. amblyrhynchus and S. nasutus are partial spawners. The size at first maturity and type of spawning of P. maculatus were not possible to determine in this work.

Fish reproduction; reservoir; dam effects


Fish reproduction; reservoir; dam effects

Biologia reprodutiva de três espécies simpátricas de peixes neotropicais: Pimelodus maculatus Lacépède (Siluriformes, Pimelodidae), Leporinus amblyrhynchus Garavello & Britski e Schizodon nasutus Kner (Characiformes, Anostomidae) do recém-formado Reservatório de Miranda, Alto Paraná

Reproductive biology of three simpatric species of Neotropical fishes: Pimelodus maculatus Lacépède (Siluriformes, Pimelodidae), Leporinus amblyrhynchus and Schizodon nasutus Kner (Characiformes, Anostomidae) from the newly formed Miranda Reservoir, High Paraná Basin

Volney VonoI; Luiz Gustavo M. SilvaII; Bruno P. MaiaII; Hugo P. GodinhoIII

IPrograma de Pós-Graduação em Ecologia, Conservação e Manejo de Vida Silvestre, Universidade Federal de Minas Gerais. Avenida Antonio Carlos 6627, Caixa Postal 486, 31270-901 Belo Horizonte, Minas Gerais, Brasil

IIBolsista FIP/PUC Minas

IIPrograma de Pós-graduação em Zoologia de Vertebrados, PUC Minas Gerais. Avenida Dom José Gaspar 500, Prédio 41, 30535-610 Belo Horizonte, Minas Gerais, Brasil

ABSTRACT

The reproductive activity parameters of the teleosts Pimelodus maculatus Lacépède, 1803, Leporinus amblyrhynchus Garavello & Britski, 1987 and Schizodon nasutus Kner, 1859 was evaluated at a newly formed reservoir in the Araguari River, Paraná River basin, Southeast Brazil. The fishes were captured by gill nets bimonthly from November 1997 to November 1998 at three sampling stations. The stages of gonad development were identified macroscopically in the field and then confirmed by histological analysis in the laboratory. The females of all species reached larger standard length than the males. Pimelodus maculatus in reproductive activity were captured only in November, 1997 and January, 1998 whereas L. amblyrhynchus and S. nasutus were in activity throughout the year. The gonadosomatic index reached the peak during the advanced maturation stage in all species, but the hepatosomatic index and coelomic fat index exhibited distinct tendencies. Length at first maturity was 9.5 cm SL for amblyrhynchus females and 17.1 and 13.0 cm SL, respectively, for S. nasutus females and males. L. amblyrhynchus and S. nasutus are partial spawners. The size at first maturity and type of spawning of P. maculatus were not possible to determine in this work.

Key words: Fish reproduction, reservoir, dam effects

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AGRADECIMENTOS. Agradecemos ao GE/PA, da Companhia Energética de Minas Gerais (CEMIG), pelo suporte financeiro dado ao estudo, ao CNPq e ao FIP PUC MINAS pelas bolsas concedidas. A Denise da Silveira Lemos, pelo auxílio na dissecção dos indivíduos de taguara.

Recebido em 24.VIII.2001; aceito em 02.IX.2002.

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Datas de Publicação

  • Publicação nesta coleção
    15 Maio 2009
  • Data do Fascículo
    Set 2002

Histórico

  • Recebido
    24 Ago 2001
  • Aceito
    02 Set 2002
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