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

Abstract

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.