Browsing Irish Fisheries Leaflets by Author "Twomey, E"
The Contribution of Hatchery-Reared Smolts to the Irish Drift Net FisheryTwomey, E (Department of Fisheries and Forestry, 1982)This Leaflet gives the results of the examination of 104,851 salmon caught by the drift nets between 1978 and 1981. The majority of salmon taken in the Irish commercial fishery are caught by drift nets. The drift net fishery takes place in coastal waters from May onwards and exploits, in the main, one sea-winter fish. In order to quantify the contribution of hatchery reared smolts to the fishery, the commercial catch was sampled at various landing sites between 1978 and 1981. The results obtained showed that the reared fish were randomly distributed in the drift net catch around the coast from Malin Head to Ardmore Bay. The highest contribution (12.9%) was found in the fish captured along the Galway and South Mayo coasts. The next highest contribution was in West Cork where 6.3% of the fish sampled were recorded as reared. The analysis of each day's sample throughout the season indicated that the reared fish arrived concurrently with the wild salmon. A calculation of the value of the salmon which were derived from hatchery-reared smolts was made, based on the percentage of reared fish observed in the catch samples. The conclusion was drawn that, although the contribution of reared smolts to the total catch is small, the principle of artificial rearing of smolts is justified in view of the contribution to the national catch and the spawning stock.