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dc.contributor.authorO'Donnell, C
dc.contributor.authorEgan, A
dc.contributor.authorLynch, D
dc.contributor.authorBoyd, J
dc.contributor.authorWall, D
dc.contributor.authorGoddjin, L
dc.date.accessioned2011-06-23T14:11:59Z
dc.date.available2011-06-23T14:11:59Z
dc.date.issued2007
dc.identifier.citationO'Donnell, C., Egan, A., Lynch, D., Boyd, J., Wall, D. & Goddjin, L., "Northwest Herring Acoustic Survey Cruise Report and Abundance 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/10793/295
dc.descriptionUse the URI link below to search the Marine Institute Data Discovery Catalogue for datasets relevant to this report.en_GB
dc.description.abstractThe northwest and west coast herring acoustic survey programme was first implemented in 1994, with the current winter spawning survey representing the 9th in the time series. The stock in this area is composed of 2 spawning components (autumn and winter), covering a large geographical area. Spawning occurs over a protracted period of over 4-months from late September through to late March. The age profile of the survey stock as generated from trawl samples indicated ages ranging from 1-7 years. Maturity samples indicate the largest proportion of the stock to be in a pre-spawning, spawning or spent state, with small amounts of immature fish, as would be expected at this time. The 2007 survey estimate generated a TSB (total stock biomass) of 14,200 t relating to a SSB (spawning stock biomass) of 13,974 t. Poor weather dominated the survey with almost 25% lost in downtime. As a result the survey area and track lines had to be reduced to compensate and hydrographic stations had to be sacrificed. The poor weather experienced no doubt had an impact on herring schooling behaviour and our detection ability.en_GB
dc.language.isoenen_GB
dc.publisherMarine Instituteen_GB
dc.relation.ispartofseriesFSS Survey Series;2007/02
dc.subjectFisheries acousticsen_GB
dc.subjectherringen_GB
dc.subjectage stratified abundance estimateen_GB
dc.subjectautumn anden_GB
dc.titleNorthwest Herring Acoustic Survey Cruise Report and Abundance Estimate, 2007en_GB
dc.typeTechnical Reporten_GB
refterms.dateFOA2018-01-12T03:07:18Z


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