Age estimations have varied greatly for C. gunnari, with variation among populations common as well. A life expectancy of 5-6 years of age has been suggested for populations on northern grounds due to physiological constraints. Other estimates, from South Georgia indicate most fish don’t live past 6 to 7 years. Bouvetoya and the southern Scotia Arc sustain the oldest fish that reach at least 12 to 15 years of age (Kock and Everson 2003).
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