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Comparing growth and maturity of sympatric Atlantic (Gadus morhua) and Greenland (Gadus ogac) cod in coastal Newfoundland

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Abstract:

Growth and maturity of two sympatric gadids were examined from 48 Atlantic (Gadus morhua L., 1758) and 42 Greenland (Gadus ogac Richardson, 1836) cod ranging from 17 to 74 cm in length collected from an inshore area of Trinity Bay, Newfoundland, Canada, during 2009 and 2010. Ages estimated from otolith readings ranged from 2 to 7 for both species. Age and size at 50% maturity differed between species, being 2.3 years and 28.2 cm for G. ogac and 4.6 years and 48.8 cm for G. morhua. von Bertalanffy growth models did not differ between species with parameters L = 91 cm, k = 0.16 year−1, t 0 = –0.02 years for G. ogac and L = 112 cm, k = 0.13 year−1, t 0 = 0.18 years for G. morhua. Length (L) – mass (W) relationships differed; W = 0.000005 kg·cm b × L 3.17 for G. ogac and W = 0.000011 kg·cm b × L 2.91 for G. morhua suggested slightly positive and negative allometric growth, respectively. For G. morhua, growth curves, length–mass relationships, and maturity rates did not differ between fish collected during this and earlier studies. Differences in maturity schedules and growth may decrease resource competition and help facilitate coexistence of these species.

Keywords: Atlantic cod; Gadus morhua; Gadus ogac; Greenland cod; age; coexistence; croissance; cycle vital; growth; life history; maturity; maturité; morue franche; morue ogac; âge

Document Type: Research Article

DOI: http://dx.doi.org/10.1139/cjz-2013-0079

Publication date: January 1, 2013

More about this publication?
  • Published since 1929, this monthly journal reports on primary research contributed by respected international scientists in the broad field of zoology, including behaviour, biochemistry and physiology, developmental biology, ecology, genetics, morphology and ultrastructure, parasitology and pathology, and systematics and evolution. It also invites experts to submit review articles on topics of current interest.
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