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Gonadal development of triploid Atlantic Cod Gadus morhua

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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 (I G) and higher carcass yields (Y C) 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 I G or Y C in relation to ploidy, with the exception of a higher Y C 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.

Keywords: gadoid; maturity; ovaries; ploidy; sterility; testes

Document Type: Regular Paper


Affiliations: 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

Publication date: June 1, 2011

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