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The responses of fish populations to anthropogenic and environmental drivers are of growing interest. In commercial fisheries attention is increasingly directed to species historically being of secondary importance and potentially being influenced by these drivers. We present long-term commercial fisheries data of North Sea whiting (Merlangius merlangus), comprising international catches (1903–2010),...
It is commonly assumed that iteroparous fish, once mature, normally reproduce in all consecutive seasons. Recent work has suggested, however, that in Norwegian spring-spawning herring—a population that undertakes extensive spawning migrations—almost one in two adults may skip their second spawning migration. Why should herring not return to spawn the year after first spawning, but instead wait an...
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