Connectivity of larval cod in the transition area between North Sea and Baltic Sea and potential implications for fisheries management.

Huwer, B., Hinrichsen, Hans-Harald, Hüssy, K. and Eero, M. (2016) Connectivity of larval cod in the transition area between North Sea and Baltic Sea and potential implications for fisheries management. ICES Journal of Marine Science: Journal du Conseil, 73 (7). pp. 1815-1824. DOI 10.1093/icesjms/fsw043.

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Abstract

Connectivity of pelagic, early life stages via transport by ocean currents may affect survival chances of offspring, recruitment success, and mixing of stocks across management units. Based on drift model studies, transport patterns of particles representing exogenously feeding cod larvae in the transition area between North Sea and Baltic were investigated to (i) determine long-term trends and variability in advective transport of larvae from spawning grounds to juvenile nursery areas, (ii) estimate the degree of exchange between different management areas, and (iii) compare the results with spatial distributions of juvenile cod. The transport of particles showed considerable intra- and interannual variability, but also some general patterns of retention within and dispersion to different management areas. Good spatial overlap of particle end positions, representing potential juvenile settlement areas, with observed distributions of juveniles in bottom trawl surveys suggests that the drift simulations provide reasonable estimates of early life stage connectivity between cod populations in the investigated areas. High exchange rates of particles between management areas of up to ca. 70% suggest that cod populations in the investigated areas are demographically correlated. Results are discussed in relation to their relevance for stock structure, fish stock assessment, and management.

Document Type: Article
Keywords: connectivity; early life stages; fisheries management; juvenile nursery areas; spatial management; stock structure
Research affiliation: OceanRep > GEOMAR > FB3 Marine Ecology > FB3-EV Evolutionary Ecology of Marine Fishes
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1093/icesjms/fsw043
ISSN: 1054-3139
Projects: BONUS BIO-C3, INSPIRE
Date Deposited: 08 Apr 2016 13:11
Last Modified: 04 May 2017 06:22
URI: http://oceanrep.geomar.de/id/eprint/32016

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