Covariation between grey seal (Halichoerus grypus) abundance and natural mortality of cod (Gadus morhua) in the southern Gulf of St. Lawrence

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From polar night to midnight sun: photoperiod, seal predation, and the diel vertical migrations of polar cod (Boreogadus saida) under landfast ice in the Arctic Ocean (2010, background): “... agreement with the prediction of reduced migrations and a deeper distribution of large conspicuous individuals (Giske et al. 1990; Fortier et al. 2001), large polar cod with disproportionately large livers remained at depth, avoiding moving above 180 m (Fig. 6). In the North Atlantic, grey seals”
Impacts of environmental change and direct and indirect harvesting effects on the dynamics of a marine fish community (2008, background): “Congruent trends between that mortality and grey seal abundance suggest the hypothesis that increasing predation by grey seals may contribute to the reduced productivity of this cod population (Chouinard et al. 2005).”