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dc.contributor.authorO'Donnell, C
dc.contributor.authorEgan, A
dc.contributor.authorLynch, D
dc.contributor.authorDransfeld, L
dc.contributor.authorBoyd, J
dc.contributor.authorLyons, K
dc.contributor.authorWall, D
dc.date.accessioned2011-06-23T10:03:14Z
dc.date.available2011-06-23T10:03:14Z
dc.date.issued2007
dc.identifier.citationO'Donnell, C., Egan, A., Lynch, D., Dransfeld, L., Boyd, J., Lyons, K. & Wall, D., "Celtic Sea Herring Acoustic Survey Cruise Report and Biomass Estimate, 2007", FSS Survey Series, Marine Institute 2007en_GB
dc.identifier.urihttp://catalog.marine.ie/geonetwork/srv/en/main.home
dc.identifier.urihttp://hdl.handle.net/10793/290
dc.descriptionUse the URI link below to search the Marine Institute Data Discovery Catalogue for datasets relevant to this report.en_GB
dc.description.abstractIn the southwest of Ireland and the Celtic Sea (ICES Divisions VIIaS, g & j), herring are an important commercial species to the pelagic and polyvalent fleet. The local fleet is composed of dry hold polyvalent vessels and a small number of purpose built RSW (Refrigerated seawater) vessels. The stock is composed of both autumn and winter spawning components and the fishery targets pre-spawning and spawning aggregations. The Irish commercial fishery has historically taken place within 1-20nmi (nautical miles) of the coast and focused on aggregated schools within the spawning cycle. In recent years the larger RSW vessels have actively targeted offshore summer feeding aggregations in the south Celtic Sea. In VIIj, the fishery traditionally begins in early October and is concentrated within several miles of the shore including many bays and inlets. The VIIaS fishery peaks towards the year end in December, but may be active from mid October depending on location. In VIIg, along the south coast herring are targeted from October to January at a number of known spawning sites and surrounding areas. Overall, the protracted spawning period of the two components extends from October through to January, with annual variation of up to 3 weeks. Spawning occurs in successive waves in a number of well known locations including large scale grounds and small discreet spawning beds. The geographical confines of the annual 21 day survey have been modified in recent years to include areas to the south of the main winter spawning grounds in an effort to identify the whereabouts of winter spawning fish before the annual inshore spawning migration. Spatial resolution of acoustic transects has been increased over the entire south coast survey area. The acoustic component of the survey has been further complimented by detailed hydrographic and marine mammal and seabird work programs first initiated during this survey in 2004.en_GB
dc.language.isoenen_GB
dc.publisherMarine Instituteen_GB
dc.relation.ispartofseriesFSS Survey Series;2007/03
dc.subjectCE0713en
dc.titleCeltic Sea Herring Acoustic Survey Cruise Report and Biomass Estimate, 2007en_GB
dc.title.alternativeCE0713en
dc.typeTechnical Reporten_GB
refterms.dateFOA2018-01-12T03:02:14Z


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