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Stocks assesment, biomass and fish production in two mediterranean basins (NE Spain)

In order to evaluate the success of the reintroduction of the Eurasian otter (Lutra lutra) in the Empordh wetlands (Parc Natural dels Aiguamolls de I’Empordhà), and the Muga and Fluvih basins, density of fish, biomass and production in the Muga and Fluvia Rivers have been estimated, since fishes represent the principal prey in the otter diet. 12 study sites were selected in order to survey the main flows in both basins. Electrofishing surveys were conducted by blocking off the station with barrier nets, which was performed upon 3 successive catches. The density estimated presents a range of 1,136-1 25 ind .ha’ in the Muga basin, 4,49-163 ind.ha’ in the Fluvih basin and 3,76-52,2 ind.ha’ in the Empordh wetlands. Estimated biomass ranges are 0,616-277,6 g.m2, 8,79-351,2 g.m2, and 5,7-108 g.m-2 respectively. These density anfi biomass ranges are similar to other results obtained from rivers inhabited by the Eurasian otter in NE Spain

© Limnetica, 1996, vol. 12, núm. 1, p. 47-58

Asociación Española de Limnología

Author: Zamora Hernández, Lluís
Saavedra, D.
Moreno i Amich, Ramon
Date: 1996
Abstract: In order to evaluate the success of the reintroduction of the Eurasian otter (Lutra lutra) in the Empordh wetlands (Parc Natural dels Aiguamolls de I’Empordhà), and the Muga and Fluvih basins, density of fish, biomass and production in the Muga and Fluvia Rivers have been estimated, since fishes represent the principal prey in the otter diet. 12 study sites were selected in order to survey the main flows in both basins. Electrofishing surveys were conducted by blocking off the station with barrier nets, which was performed upon 3 successive catches. The density estimated presents a range of 1,136-1 25 ind .ha’ in the Muga basin, 4,49-163 ind.ha’ in the Fluvih basin and 3,76-52,2 ind.ha’ in the Empordh wetlands. Estimated biomass ranges are 0,616-277,6 g.m2, 8,79-351,2 g.m2, and 5,7-108 g.m-2 respectively. These density anfi biomass ranges are similar to other results obtained from rivers inhabited by the Eurasian otter in NE Spain
Format: application/pdf
ISSN: 0213-8409
Document access: http://hdl.handle.net/10256/7895
Language: eng
Publisher: Asociación Española de Limnología
Collection: Reproducció digital del document publicat a: http://www.limnetica.com/Limnetica/Limne12/L12a047_Fish_biomass_Muga_Fluvia_rives.pdf
Articles publicats (IEA)
Is part of: © Limnetica, 1996, vol. 12, núm. 1, p. 47-58
Rights: Tots els drets reservats
Subject: Aiguamolls de l’Empordà (Catalunya)
Aiguamolls de l’Empordà (Catalonia)
Parc Natural dels Aiguamolls de l’Empordà (Catalunya)
Biologia de poblacions -- Catalunya -- Aiguamolls de l’Empordà
Population biology -- Catalonia -- Aiguamolls de l’Empordà
Title: Stocks assesment, biomass and fish production in two mediterranean basins (NE Spain)
Type: info:eu-repo/semantics/article
Repository: DUGiDocs

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