• The Fat Contents of Irish Mackerel During 1984/85 and 1985/86

      Barnwall, E (Department of Tourism, Fisheries and Forestry, 1986-06)
      The fat contents of Irish mackerel in recent years (1983-1984) have been published by McArdle, Barrtwall and Nolan (Fishery Leaflet 129). Since then, routine analyses of mackerel including fat content have been continued during the 1984/85 and 1985/86 seasons and the results have been circulated to the trade. Because processors now attach considerable importance to fat contents, and because there have been suggestions that the fat content during 1985/86 may have been abnormally high, it has been decided to publish the complete results of all samples analysed during the last two fishing seasons.
    • Herring tagging experiments around Ireland, 1991

      Molloy, J; Barnwall, E; Morrison, J (Department of the Marine, 1993-05)
      The assessment and management of the herring fisheries around Ireland assumes that there are three distinct and separate populations. The management units are based on ICES Areas which, however, are not based on the distribution of the stocks and which do not take into account the mixing that takes place between the different stocks. In July 1992 a herring tagging experiment was carried out, designed to provided information on the migration of the herring around Ireland which would be useful in establishing more realistic management units. In the experiment over 20,000 herring were tagged and liberated - 10,000 southwest of the Isle of Man and 10,000 in Broadhaven Bay. Over 450 tagged fish have been recovered to date and the results suggested considerable movement of herring between the different management units. There appears to be a major link between the Irish Sea stocks and the part of the Celtic Sea stock that spawns off the south east coast of Ireland. A small number of fish tagged off the Mayo coast migrated south to the coast of Kerry. The mixing of these stocks should be taken into account when the various stocks are assessed and when the annual TAC's are estimated.
    • Length-Weight Relationships, Fat Content and Parasitic Infestation of Irish Mackerel

      McArdle, E; Barnwall, E; Nolan, F (Department of Fisheries and Forestry, 1985)
      Landings of mackerel by Irish vessels have increased dramatically in recent years. The total catch in 1982 amounted to 110,000 tonnes which was valued at about 8.5 million pounds, compared with only 8,500 tonnes, values at 0.36 million pounds in 1974. The major cause of the increase has been the introduction of six large trawlers into the fleet around 1980 as a result of which the total catch jumped from 24,000 tonnes in 1979 to 80,000 tonnes in 1980. The main landings into Irish ports are made at Killybegs and Rathmullen, while smaller landings are made into Castletownbere and Galway. Since 1983 considerable quantities have also been landed into western Scottish ports. Most of the catches are taken off the west and northwest coast but again since 1983 the Irish fleet has successfully fished over a wide area extending from west of the Shetland Islands down to Cornwall.
    • Roe Yield of Irish Herring

      Barnwall, E (Department of the Marine, 1989-08)
      This Leaflet provides the detailed information on the spawning condition of herring required to develop the trade in the roe fishery. It is based on the laboratory examination of two thousand individual specimens supplied by the Industry.