Reproduction of the annual fish Austrolebias nigrofasciatus (Rivulidae) maintained at different temperatures

Authors

  • M. V. Volcan,

    Corresponding author
    1. Programa de Pós-Graduação em Aqüicultura, Instituto de Oceanografia, Universidade Federal do Rio Grande (FURG), Rio Grande, Brazil
    2. Programa de Pós Graduação em Biodiversidade Animal, Universidade Federal de Santa Maria (UFSM), Santa Maria, Brazil
    • Instituto Pró-Pampa (IPPampa), Laboratório de Ictiologia, Pelotas, Brazil
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  • L. A. Sampaio,

    1. Laboratório de Maricultura, Instituto de Oceanografia, Universidade Federal do Rio Grande (FURG), Rio Grande, Brazil
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  • D. C. Bongalhardo,

    1. Departamento de Fisiologia e Farmacologia, Instituto de Biologia, Universidade Federal de Pelotas (UFPEL), Pelotas, Brazil
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  • R. B. Robaldo

    1. Departamento de Fisiologia e Farmacologia, Instituto de Biologia, Universidade Federal de Pelotas (UFPEL), Pelotas, Brazil
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Author's address: Matheus Vieira Volcan, Instituto Pró-Pampa (IPPampa), Ichthyology Laboratory, Uruguai Street, 1242 Centro, Zip Code 96010-630 Pelotas, Brazil.

E-mail: matheusvolcan@hotmail.com

Summary

Temperature is considered an important factor that influences the life cycle of annual fishes, however the thermal preferendum of Austrolebias nigrofasciatus reproduction has not been defined. The hypothesis was that the fecundity of the species would respond differently within the temperature range analyzed, presenting an optimum thermal. Thus, this study investigated the effect of temperature on the fecundity of A. nigrofasciatus for the first time under laboratory conditions. Pairs of A. nigrofasciatus were placed in aquaria with temperatures of 17, 21 or 25°C, with four pairs (replicates) for each treatment, for five weeks. Contrary to expected, there were no significant differences in fecundity parameters among the tested temperatures, but the weekly fecundity at 17 and 21°C was more homogeneous than at 25°C. During the experimental period, the temperature did not affect male growth; however, at 25°C there was a negative effect on female body growth. The condition factor was also influenced, suggesting a tendency towards a negative energy balance with increasing temperature. The results indicate that temperatures between 17 and 21°C are suitable for broodstock maintenance.

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