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Gonadal development of triploid Atlantic Cod Gadus morhua

Authors

  • N. J. Feindel,

    Corresponding author
    1. Department of Biology, University of New Brunswick, P. O. Box 4400, Fredericton, NB, E3B 5A3 Canada
    2. Fisheries and Oceans Canada, St Andrews Biological Station, 531 Brandy Cove Road, St Andrews, NB, E5B 2L9 Canada
      Tel.: +1 506 467 7796; email: feindel_17@hotmail.com
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  • T. J. Benfey,

    1. Department of Biology, University of New Brunswick, P. O. Box 4400, Fredericton, NB, E3B 5A3 Canada
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  • E. A. Trippel

    1. Fisheries and Oceans Canada, St Andrews Biological Station, 531 Brandy Cove Road, St Andrews, NB, E5B 2L9 Canada
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Tel.: +1 506 467 7796; email: feindel_17@hotmail.com

Abstract

During their third and fourth years of life, triploid Atlantic cod Gadus morhua females exhibited diminished ovarian development at both macroscopic and microscopic levels, with significantly lower gonado-somatic indices (IG) and higher carcass yields (YC) than diploid females during spawning periods. In contrast, diploid and triploid testes were indistinguishable through macroscopic and histological assessment. No significant differences were found in male IG or YC in relation to ploidy, with the exception of a higher YC for triploids during the first of the two monitored spawning seasons. As a result of suppressed oogenesis, triploid female G. morhua, but not triploid males, can be used to eliminate sexual maturation in this species and advance the development of the G. morhua aquaculture industry.

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