Marine Institute Open Access Repository >
Marine Institute Community of Research Publications >
Survey Reports >
Acoustic Surveys >

Please use this identifier to cite or link to this item: http://hdl.handle.net/10793/295

Title: Northwest Herring Acoustic Survey Cruise Report and Abundance Estimate, 2007
Authors: O'Donnell, C
Egan, A
Lynch, D
Boyd, J
Wall, D
Goddjin, L
Keywords: Fisheries acoustics
herring
age stratified abundance estimate
autumn and
Issue Date: 2007
Publisher: Marine Institute
Citation: O'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 2007
Series/Report no.: FSS Survey Series;2007/02
Abstract: The 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.
Description: Use the URI link below to search the Marine Institute Data Discovery Catalogue for datasets relevant to this report.
URI: http://catalog.marine.ie/geonetwork/srv/en/main.home
http://hdl.handle.net/10793/295
Appears in Collections:Acoustic Surveys

Files in This Item:

File Description SizeFormat
NW Herring Acoustic Survey Report 2007.pdf3.84 MBAdobe PDFView/Open
Use License

Items in the Marine Institute Open Access Repository are protected by copyright, with all rights reserved, unless otherwise indicated.

 

Valid XHTML 1.0! Marine Institute Copyright © 2011  - Feedback