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- Title
Cormorant Catch Concerns for Fishers: Estimating the Size-Selectivity of a Piscivorous Bird.
- Authors
Troynikov, Vladimir; Whitten, Athol; Gorfine, Harry; Pūtys, Žilvinas; Jakubavičiūtė, Eglė; Ložys, Linas; Dainys, Justas
- Abstract
Conflict arises in fisheries worldwide when piscivorous birds target fish species of commercial value. This paper presents a method for estimating size selectivity functions for piscivores and uses it to compare predation selectivities of Great Cormorants (Phalacrocorax carbo sinensis L. 1758) with that of gill-net fishing on a European perch (Perca fluviatilis L. 1758) population in the Curonian Lagoon, Lithuania. Fishers often regard cormorants as an unwanted “satellite species”, but the degree of direct competition and overlap in size-specific selectivity between fishers and cormorants is unknown. This study showed negligible overlap in selectivity between Great Cormorants and legal-sized commercial nets. The selectivity estimation method has general application potential for use in conjunction with population dynamics models to assess fish population responses to size-selective fishing from a wide range of piscivorous predators.
- Subjects
FISHERS; CORMORANTS; PISCIVOROUS birds; POPULATION dynamics; PISCIVOROUS fishes; COMPARATIVE studies
- Publication
PLoS ONE, 2013, Vol 8, Issue 11, p1
- ISSN
1932-6203
- Publication type
Article
- DOI
10.1371/journal.pone.0077518