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Reproductive aspects of the yellowtail snapper Ocyurus chrysurus from the southern Gulf of Mexico

Authors

  • J. Trejo-Martínez,

    1. Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional, Departamento de Recursos del Mar, Unidad Mérida, Antigua Carretera a Progreso km 6, Apartado Postal 73 Cordemex, Código Postal 97310, Mérida, Yucatán, México
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  • T. Brulé,

    Corresponding author
    1. Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional, Departamento de Recursos del Mar, Unidad Mérida, Antigua Carretera a Progreso km 6, Apartado Postal 73 Cordemex, Código Postal 97310, Mérida, Yucatán, México
      Tel.: +52999 942 94 54; email: tbrule@mda.cinvestav.mx
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  • A. Mena-Loría,

    1. Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional, Departamento de Recursos del Mar, Unidad Mérida, Antigua Carretera a Progreso km 6, Apartado Postal 73 Cordemex, Código Postal 97310, Mérida, Yucatán, México
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  • T. Colás-Marrufo,

    1. Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional, Departamento de Recursos del Mar, Unidad Mérida, Antigua Carretera a Progreso km 6, Apartado Postal 73 Cordemex, Código Postal 97310, Mérida, Yucatán, México
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  • M. Sánchez-Crespo

    1. Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional, Departamento de Recursos del Mar, Unidad Mérida, Antigua Carretera a Progreso km 6, Apartado Postal 73 Cordemex, Código Postal 97310, Mérida, Yucatán, México
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Tel.: +52999 942 94 54; email: tbrule@mda.cinvestav.mx

Abstract

In this study, sex ratio, spawning season, fork length (LF) at maturity (LF50), batch fecundity and spawning frequency were characterized for the continental population of Ocyurus chrysurus from the Campeche Bank, in the southern Gulf of Mexico. A total of 1657 specimens were collected from February 2008 to January 2009. The overall sex ratio (male:female) and sex ratios by size-class showed no significant differences from an expected 1:1 ratio. The Campeche Bank population did not conform to the reproductive seasonality pattern characteristic of a continental population. A protracted spawning season that extended from January to September with peaks occurring mainly between April and May and additionally in September was observed. The population conformed, however, to the sexual maturity pattern observed for populations and species associated with a continental margin. Fish of both sexes reached the onset of sexual maturity at a similar and small LF of c. 14 cm, and LF50 (LF at which 50% of females and males become mature) was 21·3 and 19·4 cm. Asynchronous-type ovarian development was observed for this species and batch fecundity estimates ranged from 14 102 to 164 756 oocytes (mean ±s.d. = 43852 ± 32684 oocytes). The overall spawning frequency estimate was once every 8·3 days or 26 times during the 9 month spawning season.

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