Temporal stability of the maturation schedule of capelin (Mallotus villosus Mueller) in the Barents Sea

Baulier, L., Heino, M. ORCID: https://orcid.org/0000-0003-2928-3940, & Gjosaeter, H. (2012). Temporal stability of the maturation schedule of capelin (Mallotus villosus Mueller) in the Barents Sea. IIASA Interim Report. IIASA, Laxenburg, Austria: IR-12-021

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Abstract

Capelin in the Barents Sea are primarily harvested in a terminal fishery that targets maturing indiviuals. Theory predicts that, in a semelparous population (i.e., one in which reproduction is seasonal, synchronous, and followed by parental mortality), an unselective, terinal fishery (i.e., one in which most of the fish that are not caught will not have a new spawning opportunity) does not generate strong selection for changed age and size at mturation. The probabilistic maturation reaction norm (PMRN) method was applied to test this prediction and to detect possible temporal changes in length at maturation o Barents Sea capelin between 1978 and 2008. Maturation reaction norms suggest that maturation is age-independent in capelin, but that males require a larger size to attainthe same maturation probability as females. No temporal trends in length at maturation could be detected, thus confirming the theoretical prediction. Furthermore, none of thecandidate environmental variables tested to explain the temporal variability in length at maturation (water temperature and capelin biomass) consistently shoed a significant correlation with the PMRN midpoints.

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