Marine Institute Open Access Repository >
Marine Institute Community of Research Publications >
Irish Fisheries Bulletin >
Irish Fisheries Bulletin >

Please use this identifier to cite or link to this item: http://hdl.handle.net/10793/181

Title: Aspects of the exploitation of hake Merluccius merluccius belonging to the northern stock by fleets based in Ireland
Authors: Fahy, E.
Gleeson, P.
Keywords: hake Merluccius merluccius
Issue Date: 1993
Publisher: Department of the Marine
Citation: Fahy, E. & Gleeson, P., "Aspects of the exploitation of hake Merluccius merluccius belonging to the northern stock by fleets based in Ireland", Irish Fisheries Bulletin, Department of the Marine 1993
Series/Report no.: Irish Fisheries Bulletin;13
Abstract: The development of the hake fishery in the ICES Divisions adjoining Ireland displays strong similarities to the fishery for megrim; Ireland's landings of hake rose from 100t per year in 1979 to 2,000t ten years later. Most hake comes from Divisions Vllg-k. The Communities Logbook of the Irish-Spanish joint venture fleet provides a short time series. CPUE by both demersal trawl and long line declined sharply between 1985 and 1991. The second quarter is the most productive of hake landings but otherwise there is no clear seasonal pattern. Hake were sampled on a half yearly basis and the fish were aged on the otoliths with a success rate of 70%. Ages in the first half were adjusted to a birth date of 1 January. Mean lengths at age were higher than those calculated by statistical methods (Normsep.). Length frequencies indicated two age groups in the discards. Methods of capturing hake have altered over the past five years, gill nets have increased their share of the Irish catch and, in 1991, were a close second to demersal trawl. Age of recruitment to the landings is 2-4 years. Discard hake was calculated at 25-163% by weight of landings per quarter in 1991, higher values coming from small-meshed nets targeting Nephrops. Survivorship curves based on aged length frequencies of hake taken by whitefish boats provided F values of between 0.40 and 0.76. These results are high and together with sharply declining CPUE would seem to suggest the part of the stock in Divisions Vllb-c and Vllg-k is more heavily fished than the stock in other parts of Sub-area VII.
URI: http://hdl.handle.net/10793/181
ISSN: 0332-4338
Appears in Collections:Irish Fisheries Bulletin

Files in This Item:

File Description SizeFormat
No 13 1993 Aspects of the exploitation of hake Merluccius merluccius.pdf613.38 kBAdobe 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