dc.contributor.author | MacKenzie, K. | |
dc.contributor.author | Mehl, Sigbjørn | |
dc.date.accessioned | 2008-07-07T09:00:20Z | |
dc.date.issued | 1984 | |
dc.identifier.uri | http://hdl.handle.net/11250/100271 | |
dc.description.abstract | The trypanorhynch cestode Grillotia angeli Dollfus, 1969, infects mackerel
Scomber scombrus L. up to the age of two years and survives thereafter as an
encvsted plerocercus for as long as the mackerel lives. In the eastern North
Atlantic infection can only take ilace in and to the south of ICES sub-area VII, ie
to the south and west of Britain and Ireland. In year classes 1977 and earlier,
13.8% of mackerel which originated from nursery grounds in sub-area VII were
infected with -G. angeli; in yLar classes 1978 and later, prevalence decreased to
1.2%.
Data from year elasses 1977 and earlier indicate that: (1) mackerel caught off the
north coast of Spain (sub-area VIII) and off Portugal (sub-area IX) were of dif ferent
nursery origin from those caught further north; (2) mackerel caught in the
southern North Sea (Division IVc) were predominately of southwestern origin; (3)
to the northwest of Scotland (Division VIa north of 58ON) the proportions of
mackerel of southwestern origin decreased from approximately 50% in September
to 10% in January-February, then increased to >50% in March-April; (4)
approximately 30% of all rnackerel caught in the Norwegian Sea (Division IIa) and
the northern North Sea (Division IVa) were of southwestern origin. Brevalence data
from different areas suggest that mackerel of year classes 1978 and later from
southwestern nursery grounds have been migrating into northern areas in greater
numbers than earlier year classes. | en |
dc.format.extent | 606944 bytes | |
dc.format.mimetype | application/pdf | |
dc.language.iso | eng | en |
dc.relation.ispartofseries | ICES CM documents | en |
dc.relation.ispartofseries | 1984/H:52 | en |
dc.title | The cestode parasite Grillotia Angeli as a biological tag for mackerel in the eastern North Atlantic | en |
dc.type | Working paper | en |
dc.subject.nsi | VDP::Agriculture and fishery disciplines: 900::Fisheries science: 920 | en |
dc.subject.nsi | VDP::Mathematics and natural science: 400::Zoology and botany: 480::Marine biology: 497 | |
dc.source.pagenumber | 19 s. | |