NATURAL MORTALITY AND FISHING MORTALITY IN A COASTAL COD POPULATION: A RELEASE–RECAPTURE EXPERIMENT
2001; Wiley; Volume: 11; Issue: 2 Linguagem: Inglês
10.1890/1051-0761(2001)011[0540
ISSN1939-5582
AutoresRomain Julliard, Nils Chr. Stenseth, Jakob Gjøsæter, Kyrre Lekve, Jean‐Marc Fromentin, Didrik S. Danielssen,
Tópico(s)Wildlife Ecology and Conservation
ResumoEcological ApplicationsVolume 11, Issue 2 p. 540-558 Article NATURAL MORTALITY AND FISHING MORTALITY IN A COASTAL COD POPULATION: A RELEASE–RECAPTURE EXPERIMENT Romain Julliard, Romain Julliard Division of Zoology, Department of Biology, University of Oslo, P.O. Box 1050 Blindern, N-0316 Oslo, Norway Present address: Centre de Recherches sur la Biologie des Populations d'Oiseaux (CRBPO), Muséum National d'Histoire Naturelle, 55 rue Buffon, 75005 Paris, France.Search for more papers by this authorNils Chr. Stenseth, Nils Chr. Stenseth Division of Zoology, Department of Biology, University of Oslo, P.O. Box 1050 Blindern, N-0316 Oslo, Norway Institute of Marine Research, Flødevigen Marine Research Station, N-4817 His, Norway Corresponding author. E-mail: [email protected]Search for more papers by this authorJakob GjøsÆter, Jakob GjøsÆter Institute of Marine Research, Flødevigen Marine Research Station, N-4817 His, NorwaySearch for more papers by this authorKyrre Lekve, Kyrre Lekve Division of Zoology, Department of Biology, University of Oslo, P.O. Box 1050 Blindern, N-0316 Oslo, NorwaySearch for more papers by this authorJean-Marc Fromentin, Jean-Marc Fromentin Division of Zoology, Department of Biology, University of Oslo, P.O. Box 1050 Blindern, N-0316 Oslo, Norway Present address: Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER), 1 rue Jean Vilar, BP 171, 34203 Sète Cedex, France.Search for more papers by this authorDidrik S. Danielssen, Didrik S. Danielssen Institute of Marine Research, Flødevigen Marine Research Station, N-4817 His, NorwaySearch for more papers by this author Romain Julliard, Romain Julliard Division of Zoology, Department of Biology, University of Oslo, P.O. Box 1050 Blindern, N-0316 Oslo, Norway Present address: Centre de Recherches sur la Biologie des Populations d'Oiseaux (CRBPO), Muséum National d'Histoire Naturelle, 55 rue Buffon, 75005 Paris, France.Search for more papers by this authorNils Chr. Stenseth, Nils Chr. Stenseth Division of Zoology, Department of Biology, University of Oslo, P.O. Box 1050 Blindern, N-0316 Oslo, Norway Institute of Marine Research, Flødevigen Marine Research Station, N-4817 His, Norway Corresponding author. E-mail: [email protected]Search for more papers by this authorJakob GjøsÆter, Jakob GjøsÆter Institute of Marine Research, Flødevigen Marine Research Station, N-4817 His, NorwaySearch for more papers by this authorKyrre Lekve, Kyrre Lekve Division of Zoology, Department of Biology, University of Oslo, P.O. Box 1050 Blindern, N-0316 Oslo, NorwaySearch for more papers by this authorJean-Marc Fromentin, Jean-Marc Fromentin Division of Zoology, Department of Biology, University of Oslo, P.O. Box 1050 Blindern, N-0316 Oslo, Norway Present address: Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER), 1 rue Jean Vilar, BP 171, 34203 Sète Cedex, France.Search for more papers by this authorDidrik S. Danielssen, Didrik S. Danielssen Institute of Marine Research, Flødevigen Marine Research Station, N-4817 His, NorwaySearch for more papers by this author First published: 01 April 2001 https://doi.org/10.1890/1051-0761(2001)011[0540:NMAFMI]2.0.CO;2Citations: 21 Read the full textAboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onEmailFacebookTwitterLinkedInRedditWechat Abstract As with most teleosts, the life cycle of the cod (Gadus morhua) is characterized by high productivity of eggs leading to high concentration of larvae. These stages are known to be associated with high mortality rates. Mortality of older stages (juveniles and adults) has been relatively poorly studied. We use capture–mark–recapture (CMR) methodology to estimate time and age variation of natural mortality and fishing mortality in a coastal cod population within the Norwegian Skagerrak coast. A total of 36 728 reared 6-mo-old, and 2415 wild-caught mostly 18-mo-old, individually tagged cod were released in four consecutive years, leading to 4155 recaptures by fishermen. Tag loss and mortality due to tagging appeared negligible for reared young fish, but up to 60% of the wild-caught tagged fish disappeared just after release. Tag return by fishermen was ∼50–60%. Natural mortality was found to be high in the 6–12 mo range, but subsequently it decreased rapidly and was no longer age-dependent. Fishing mortality was negligible for fish younger than 1-yr-old, intermediate for 1-yr-old fish, and high for older fish. The seasonal pattern of fishing varied much between age classes, with 2-yr-old fish mostly taken by recreational fishermen in summer, and older fish mostly taken by professional fishermen in winter. Because it is directed toward relatively young fish, recreational fishing may have a strong impact on the population; we specifically point out the coincidence between the increase of tourism and the decrease of the cod stock in the Risør area during the last 20 yr. Total mortality varied little between years, except during ∼5 mo after a major algae bloom in May 1988, when fish disappeared at a high rate whatever their age (no emigration was observed in connection with the algae bloom). 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