• 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.
    • Surveys for Herring Larvae Off the Northwest and West Coasts of Ireland in 1981

      Grainger, R; McArdle, E (Department of Fisheries and Forestry (Trade and Information Section), 1982)
      This Leaflet describes the methods used in sampling and gives the results of the 1981 survey in a series of maps showing the distribution of the young larvae. Sampling took place at fortnightly intervals and recorded the numbers of larvae in three size groups. The area of operation extended from Lough Foyle to Galway Bay. This region has been chosen because it is believed to include the entire spawning stock of a new assessment area for the herring. The survey has shown that spawning moves progressively southwards during the season in October and November and that there are three main spawning areas: north of Fanad Head, west of Aranmore and between Erris Head and Inishbofin. When the survey has been in progress for a few years it will be possible to make an improved annual assessment of the herring stock in the region which can be used by management to ensure that the fishery is exploited to the fullest extent without risk of damage to the stocks in the future.
    • Surveys for herring larvae off the northwest and west coasts of Ireland in 1982 and 1983

      Grainger, R; McArdle, E (Department of Fisheries and Forestry (Trade and Information Section), 1984)
      This Leaflet describes the methods used in sampling and gives the results of the 1982 and 1983 surveys in a series of maps showing the distribution of the young larvae. Sampling took place at fortnightly intervals and recorded the numbers of larvae in three size groups. The area of operation extended from Inishowen Head to Loop Head and thus includes the entire new assessment area for this herring stock. It was first surveyed for herring larvae in 1981 (see Fisheries Leaflet 117). As in1981, these surveys showed spawning to move progressively southwards during the season in October and November. There are three main spawning areas: the north Donegal coast, the west coast of Donegal and the west coast of Mayo. Larval abundance was over 10% higher in 1983 than in 1982. When the survey has been in progress for a few more years it will be possible to make an improved annual assessment of the herring stock in the region. This can be used by management to ensure that the fishery is exploited to the fullest extent without risk of damage to the stocks in the future.