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|Title: ||Northwest Herring Summer Acoustic Survey Cruise Report July 3-22, 2009|
|Authors: ||O'Donnell, C|
|Issue Date: ||2009|
|Publisher: ||Marine Institute|
|Citation: ||O'Donnell, C., Mullins, E., Saunders, R., Lyons, K., Blaszkowski, M., Sullivan, M., Hoare, D. & Bunn, R., "Northwest Herring Summer Acoustic Survey Cruise Report July 3-22, 2009", FSS Survey Series, Marine Institute 2009|
|Series/Report no.: ||FSS Survey Series;2009/03|
|Abstract: ||The northwest and west coast (ICES Divisions VIaS & VIIb, c) herring acoustic survey programme was first established in 1994. Prior to acoustic estimation a larval survey programme was conducted between 1981 and 1986. In the early 1990s, the ICES herring working group (HAWG) identified the need for a dedicated herring acoustic survey in this area (Anon, 1994). From 1994 to 1996 surveys were carried out on this stock during the summer feeding phase. In 1997 a two-survey spawning survey was established covering both autumn and winter components. In 2004, a single spawning stock survey was carried out early in quarter 1 and continued until 2007. In 2008, it was decided that this survey should be incorporated into the larger coordinated Malin shelf survey as recommended by SGHERWAY and WGHAWG.
This survey was the second in a new time series and a step away from the traditional spawning stock surveys. The Irish survey was carried out concurrently with the West of Scotland (MarLab) and Irish Sea surveys (AFBI) and was coordinated through the ICES Planning Group of International Pelagic Surveys (PGIPS). Combined survey data on herring distribution, abundance and age will be used to provide a measure of the relative abundance of herring within the Malin shelf stock complex. Survey data on stock numbers at age are submitted to the ICES Herring Assessment Working Group (HAWG) and used in the annual stock assessment process.
The northwest and west coast (ICES Divisions VIaS & VIIb, c) herring stock is composed of 2 of spawning components, autumn and winter spawners. Spawning covers a large geographical area and extends over a 4-month period from late September through to late March (Molloy et al, 2000). Traditionally fishing effort has been concentrated on spawning and pre- pawning aggregations. The autumn spawning component, which mostly occurs within VIIb, feeds along the shelf break area to the west of the spawning grounds. In VIaS, summertime distribution extends from close inshore to the shelf break. A component of this the winter spawning fish are known to undertake northward feeding migration into VIaN before returning in the winter to spawn along the Irish coast.
Up to 40 vessels commonly participate in the fishery, many of which are based in the Co. Donegal port of Killybegs. The fleet is made up of 20 RSW (Refrigerated Seawater) vessels of 40-70m in length; 20 polyvalent trawlers 10 of which are vessels of 22-40m and 10 of less than 25m.|
|Description: ||Use the URI link below to search the Marine Institute Data Discovery Catalogue for datasets relevant to this report.|
|Appears in Collections:||Acoustic Surveys|
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