Community Research and Development Information Service - CORDIS

Composition of mixed stock aggregations

Herring fisheries commonly exploit aggregations composed of individuals of mixed population origin. We used microsatellite DNA information obtained both in samples collected on spawning sites and in samples of mixed stocks to estimate relative population compositions in mixed aggregations in the northern North Sea and the Skagerrak. We developed a tool to determine mixed stock compositions by applying a bayesian mixed-stock analysis algorithm.

Our analysis method identified hitherto unknown spatially and temporally explicit migratory patterns of mixed aggregations of herring in the Skagerrak. Aggregations sampled in the northern North Sea showed a strong signal of major contributions from populations originating from the western North Sea and English Channel. Aggregations in the Skagerrak exhibited substantial mixing of fish originating in the North Sea, Skagerrak, Inner Danish waters and the western Baltic. We also showed that the statistical power associated with our analysis framework was high and thus that the newly developed method presents a powerful tool in fisheries assessment applications.

Reported by

Technical University of Denmark,
Vejlsovej 39
8600 Silkeborg
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