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Cephalopods : ecology and fisheries (2005)

Boyle, P. R.

Ames, Iowa : Blackwell Science

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Schlagwort(e): Squid fisheries ; Octopus fisheries ; Cephalopoda ; Squid fisheries ; Cephalopoda ; Octopus fisheries

Beschreibung / Inhaltsverzeichnis: 1. Introduction -- 2. Form and function -- 3. Origin and evolution -- 4. Nautilus : the survivor -- 5. Biodiversity and zoogeography -- 6. Life cycle -- 7. Growth -- 8. Physiological ecology -- 9. Reproduction -- 10. From egg to recruitment -- 11. Coastal and shelf species -- 12. Oceanic and deep-sea species -- 13. Population ecology -- 14. Cephalopods as predators -- 15. Cephalopods as prey -- 16. Fishing methods and scientific sampling -- 17. Fishery resources -- 18. Fisheries oceanography -- 19. Assessment and management -- 20. Conclusion -- App. A. Classification of living cephalopod families -- App. B. Synopsis of living cephalopod families.

Materialart: Online-Ressource

Seiten: 1 Online-Ressource (xii, 452 pages) , illustrations (some color), maps (some color)

ISBN: 0470995319 , 0632060484 , 9780470995310 , 9780632060481

URL: https://onlinelibrary.wiley.com/doi/book/10.1002/9780470995310

DOI: 10.1002/9780470995310

Sprache: Englisch

Anmerkung: Includes bibliographical references (pages 373-438) and index

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Resolution of multiple cohorts in the Loligo forbesi population from the west of Scotland (1999)

Collins, M. A. ; Boyle, P. R. ; Pierce, G. J. ; [weitere]

Oxford Univ. Press

In: ICES Journal of Marine Science, 56 (4). pp. 500-509.

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Publikationsdatum: 2021-06-17

Beschreibung: Length–frequency analysis was employed to resolve multiple cohorts in the Loligo forbesi population from coastal waters to the west of Scotland. In both male and female squid two principal cohorts were identified, recruiting to the fished population in April and November. Both cohorts spawned during the winter months (November to April), producing a single extended spawning season, with the April recruits of larger size at spawning than the November recruits. In the males the April recruits appeared to separate into two cohorts of different growth rates, thus producing three rather than two sizes at maturity. The abundance of L. forbesi was low during the summer months, indicating that the squid had moved outside the range of the fishery, perhaps into deeper water. Abundance declined during the spawning season, which is interpreted as post-spawning mortality. Abundance declined earlier in the males than females, producing a female biased sex ratio during most of the spawning season. The two periods of recruitment are not compatible with a 1 year life cycle and single extended spawning season and explanations of this are discussed.

Materialart: Article , PeerReviewed

Format: text

DOI: 10.1006/jmsc.1999.0485

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