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Bycatch of harbour porpoise (Phocoena phocoena L.) in the North Sea : a case study of the Grimsby gillnet fleet
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Metuzals, Kaija Irene (2001) Bycatch of harbour porpoise (Phocoena phocoena L.) in the North Sea : a case study of the Grimsby gillnet fleet. PhD thesis, University of Warwick.
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Official URL: http://webcat.warwick.ac.uk/record=b1378010
Abstract
The problem of estimating bycatches of harbour poipoise {Phocoena phocoena) in gill-net fisheries and the impact of this bycatch on management in the North Sea was examined. A case study of the Grimsby UK gillnet fleet was selected since bycatch levels from this fleet had not been analysed before. The study was based on interviews with gill-netters fishing for cod and using bottom-set and wreck-netting methods. Detailed fisheries analyses, including examination of effort, landings and bycatch statistics were undertaken for the whole fleet, consisting of 27 vessels during 1985-1999. For comparison, interviews with gillnet skippers were undertaken in Denmark in the summer of 1998. Interviews took place in the ports of Esbjerg, Hvide Sande and Thorsminde. Data from 30 licensed gillnetters (approximately 10% of the total fleet) were used. The bycatch for the UK gill-net fleet in Grimsby, using observer data in conjunction with a detailed spatio-temporal analysis of the fishery, was estimated to range from 149-297 animals per year. Estimates for the Danish fleet from interviews in 1998 ranged from 3500-4500 animals. From these studies it was concluded that interviews represent a cost-effective method of assessing levels of bycatch.
The development of more effective management structures requires the identification of areas, times and fishing-operations that are associated with a high-risk of bycatch. These were determined from spatio-temporal analyses of fishing effort by the Grimsby fleet, in relation to oceanographic features such as fronts, information from interviews and previously published studies.
In order to estimate levels of bycatch, a complete programme incorporating interviews, observer programmes, population models and increased research surveys is proposed.
| Item Type: | Thesis (PhD) | ||||
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| Subjects: | Q Science > QL Zoology S Agriculture > SH Aquaculture. Fisheries. Angling |
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| Library of Congress Subject Headings (LCSH): | Bycatches (Fisheries), Harbor porpoise, Gillnetting -- Bycatches | ||||
| Official Date: | November 2001 | ||||
| Dates: |
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| Institution: | University of Warwick | ||||
| Theses Department: | School of Life Sciences | ||||
| Thesis Type: | PhD | ||||
| Publication Status: | Unpublished | ||||
| Supervisor(s)/Advisor: | McGlade, J. M. (Jacqueline Myriam), 1955- | ||||
| Sponsors: | World Wide Fund for Nature | ||||
| Format of File: | |||||
| Extent: | xv, 238 pages | ||||
| Language: | eng |
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