http://www.cnr.it/ontology/cnr/individuo/prodotto/ID328141
Strong correspondence between gillnet cathc per unit effort and hydroacoustically derived fish biomass in stratified lakes (Articolo in rivista)
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- Strong correspondence between gillnet cathc per unit effort and hydroacoustically derived fish biomass in stratified lakes (Articolo in rivista) (literal)
- Anno
- 2012-01-01T00:00:00+01:00 (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
- 10.1111/fwb.12022 (literal)
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- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
- Matthias Emmrich; Ian J. Winfield; Jean Guillard; Atle Rustadbakken; Charlotte Vergès; Pietro Volta; Erik Jeppesen; Torben Lauridsen; Sandra Brucet; Kerstin Holmgren; Christine Argillier; Thomas Mehner (literal)
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- Matthias Emmrich: Leibniz-Institute of Freshwater Ecology and Inland Fisheries, Berlin, Germany;
Ian J. Winfield: Centre for Ecology and Hydrology, Lancaster Environment Centre, Lancaster, U.K.;
Jean Guillard: Institut National de la Recherche Agronomique, UMR CARRTEL, Thonon-les-bains, France;
Atle Rustadbakken: Norwegian Institute for Water Research, Oslo, Norway;
Charlotte Vergès: ASCONIT Consultants, ZI Champigny, Ducos, France;
Pietro Volta: CNR-ISE, Pallanza Verbania;
Erik Jeppesen: Department of Bioscience, Aarhus University, Silkeborg, Denmark;
Torben Lauridsen: Sino-Danish Centre for Education and Research, Beijing, China;
Sandra Brucet: European Commission, Joint Research Centre, Institute for Environment and Sustainability, Ispra, Italy;
Kerstin Holmgren: Swedish University of Agricultural Sciences, Department of Aquatic Resources, Institute of Freshwater Research, Drottningholm, Sweden;
Christine Argillier: Irstea, UR HYAX, Route de Ce´zanne, Aix-en-Provence Cedex, France;
Thomas Mehner: Leibniz-Institute of Freshwater Ecology and Inland Fisheries, Berlin, Germany (literal)
- Titolo
- Strong correspondence between gillnet cathc per unit effort and hydroacoustically derived fish biomass in stratified lakes (literal)
- Abstract
- 1. Sampling of lake fish assemblages is a challenging task in fish science, and the information obtained strongly depends on the choice of sampling gear. The use of more than one sampling technique is generally preferred in order to achieve a comprehensive view on fish assemblage structure. Therefore, the knowledge of whether catches between fishing gears are comparable is crucial. 2. We compared catches in benthic multi-mesh gillnets with fish biomass estimates obtained by vertical hydroacoustics in 18 European lakes strongly varying in morphometry and trophic status. Separate analyses were conducted for different depth strata and for several fish length thresholds to account for depth- and size-selective gillnet catches. 3. Gillnet catches and hydroacoustically obtained fish biomass estimates were significantly correlated. The strength of correlations was independent of the fish length thresholds applied, but varied across different depth strata of the lakes, with the strongest correlations occurring in the shallow strata. 4. The results support the applicability of vertical hydroacoustics for the quantification of fish biomass in stratified lakes. Survey designs combining hydroacoustics with limited gillnetting at sampling dates shortly one after the other, the latter for the purpose of inventory sampling only, are a cost-effective strategy for sampling fish assemblages in lakes. However, gillnet sampling does not provide reliable fish density estimates in very deep lakes with separate, pelagic-dwelling fish assemblages. (literal)
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