• Recaptures of Adult Salmon tagged as smolts at Carrigadroghid

      Browne, J; Doyle, J (Department of Fisheries and Forestry (Trade and Information Section), 1979)
      A total of 2936 salmon were tagged at Carrigadroghid Co Cork in January 1973. From this tagging there were 34 recaptures, a return rate of 1.16%. In 1975 the number of salmon smolts tagged was 4860 and 18 were recovered, representing a return rate of 0.37%. Details of the recaptures resulting from these two tagging operations are given.
    • Recaptures of Irish Tagged Salmon off Greenland

      Browne, J (Department of Agriculture and Fisheries (Fisheries Division), 1977)
      Since tagging of smolts began in Ireland there have been sixteen distant water recaptures of adult salmon tagged as smolts or parr in Irish waters. Fifteen of these were recaptured from the Greenland fishery and one salmon was recovered from the Faroe Islands. The recaptures resulted from a number of salmon smolt and salmon parr tagging programmes. Some of these programmes were designed specifically to obtain information on the distant migrations of Irish salmon but other programmes were to study migrations and mortality in the home waters. Information on recaptures has been published elsewhere (Piggins 1970, Went 1973). This leaflet brings together all the available information on recaptures of tagged Irish salmon in distant waters up to December 1975 and gives background information on the tagging programmes.
    • Report on Inshore Surveys Around the Irish Coast

      Crowley, M A (Department of Agriculture and Fisheries (Fisheries Division), 1973)
      The purpose of this leaflet is to discuss the quantity and quality of some species of commercially valuable shellfish found in certain estuaries around the Irish coast. In recent years the shellfish industry has attracted considerable interest in Ireland, partly because of the demand in England and on the Continent of Europe for Irish shellfish and shellfish products and partly because of the interest which the general public has in fish farming.
    • Results of 1997 Longline Survey of the Rockall Trough

      Connolly, P L; Kelly, C J; Clarke, M; Hareide, N (Marine Institute, 1999)
      The present survey took place over a period of 12 days in August 1997 along the eastern slope of Rockall Trough between 53 and 58ºN including the Northern slope of the Porcupine Bank. Fishing was carried out in six separate areas, in depths between 300 and 2,925 meters. The primary objective of the survey was to obtain samples of chondricthyan and teleost fish for the Marine Institute (MI) deepwater research programme, for contaminant analysis of fish by the MI chemistry section and for food technology analysis at the Teagasc National Food Centre. The survey was carried out on the Norwegian commercial long-liner "Skarheim," using commercial deep-water autoline gear. In total over 70,000 hooks were set during the trip and on average 80% of these were baited. In total 20 species of chondricthyan and 18 species of teleost fish were taken. Among the most abundant species in the catch were leafscale gulper shark Centrophorus squamosus (36%), bird beak dogfish Deania calcea (21 %), Portuguese dogfish Centrascyflium coefofepis (13%), tusk, Brosme brosme (11%) and mora, Mora mora (6%). Over the entire survey, discarding was estimated as 30% of the total catch. The main species discarded were bird beak dogfish and greater lantern shark Etmopterus princeps. Catch per 1,000 hooks showed that highest abundances were found at 600 - 1,100 metres throughout the whole fishing area. Three settings were made at depths between 2,000 and 3,000 meters. These shots gave valuable information about depth distribution of different species and also brought up species that have never been recorded in the Rockall Trough before.
    • Results of Magnetic tag Recovery Programme in the Mayo Area in 1985

      Gallagher, P (Department of Tourism, Fisheries and Forestry, 1986)
      This leaflet deals with the results of the magnetic tag recovery programme for the Mayo area in 1985. The commercial salmon catch was sampled for adipose fin clipped and micro tagged fish at a number of locations in Mayo. All fish with adipose fin clips were screened with a magnetic tag detector for tags, and the tags were read to establish the origin of the fish. Fish are tagged at various locations throughout the country with magnetic wire tags. These tagged fish are released at different times of the year, and in various river systems to establish the best time of year to release fish and the best locations. The majority of all the tagged fish are hatchery reared, only in the Corrib river are wild fish tagged.
    • Results of Magnetic Tag Recovery Programme in the Mayo Area in 1986

      Gallagher, P; Browne, J (Department of the Marine, 1987)
      Young salmon are tagged at various locations throughout the country with coded wire tags. They are released at different times of the year, and in various river systems to establish the best time of year and the best locations for release. The majority of the tagged fish are hatchery reared, the only exception being in the Corrib and Blackwater rivers where wild smolts are tagged. All micro-tagged fish are adipose fin clipped. Some hatcheries also use an adipose fin clip to mark their reared fish. Twenty nine thousand net caught salmon were examined at a number of locations in Mayo. All fish with adipose fin clips were screened with a magnetic tag detector. A total of 736 tags were recovered from which it was estimated that rearing stations contributed over 1,300 fish to the north Mayo catch.
    • Results of Salmon tagging in the Killala Bay area, 1976

      Browne, J (Department of Fisheries (Trade and Information Section), 1978)
      Salmon movements in and around Killala Bay were investigated by tagging. A total of 49 tags (17.07%) were returned. The areas of recovery ranged from the Kerry coast to the Scottish west coast. A high proportion of the tags recovered from the River Moy were from fish tagged at stations to the east of Killala Bay.
    • A Review of the Irish Lobster Fishery

      Gibson, F A (Department of Agriculture and Fisheries (Fisheries Division), 1969)
      Records of the actual numbers of lobsters caught in Irish waters prior to 1887, are difficult to obtain. However, during the last thirteen years of the 19th century, the fishery had assumed such importance as to be included with the other major ones of the period i.e. salmon, herring, mackerel and cod. In 1891, the Inspector of Irish Fisheries, W.S. Green, commented that "the lobster fishery had reached such proportions as to deserve separate reporting". The help of the Coast Guard officers was sought for the task of compiling catch statistics, with the result that, from 1892 until the outbreak of the 1914-18 war, excellent records of the catch in the fishery are available. Since then the system of statistics collection has changed and now both catch and effort in the lobster fishery are assessed. This paper deals mainly with the period 1900 to 1967.
    • A review of the national sea trout catch

      Fahy, E (Department of Fisheries and Forestry, 1981)
      Statistical coverage of the sea trout catch is not so comprehensive as for salmon but a number of recent studies, providing information on aspects of the national or regional catches, are available for comparison with official catch statistics. The proportion of the official catch attributed to drift nets in the post 1968 period is thought to have been overstated. Draft nets account for a large proportion of the catch, averaging 29% in the 1970s but rod and line take the largest share of the fish, varying between an average of 47% in the 1940s to 66% of the national catch in the 1960s. Estimated catch has risen with the number of rod licences and two phases in these statistics have been noted: prior to 1959 and thereafter. On the other hand both official figures for the mean weight of catch per licence issued in the Connemara district and the catch per rod day recorded by fishery managers there have declined since 1927. Analysis of the national catch on the basis of licence returns in 1980 indicates that 8 tonnes of sea trout were taken by draft, 0.25 tonnes by drift nets and less than 51 tonnes by rod and line.
    • 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.
    • Salmon and Trout: Natural and Artificial Propagation as Factors in the Maintenance of Stocks

      Anon. (Department of Agriculture, 1939)
      The object of fishery regulations whether statutory or departmental is, in the ultimate, conservation. That is to say, it is sought by the imposition of certain restrictions to ensure such a run of fish for breeding purposes as will increase or at least maintain the stocks. Many citizens profess dissatisfaction with the existing stocks of fish in our rivers and lakes and persistently urge that they should be enhanced by all practical means. Generally the method which suggests itself to such persons is the setting up of a hatchery, to be operated either by stripping fish captured locally or by procuring supplies of ova (eggs) from outside sources. There seems to be a rather widespread belief that such a procedure even on a modest scale is bound to produce immediately beneficial results for the waters concerned. In other words, the operation of a hatchery is expected to offset completely the evils of over-fishing, as well as the damage resulting from illegal activities (whether within or outside the fishing season) and the reduction in stocks caused by predatory birds, fish and mammals added to the pollution of waters by the entrance of deleterious matter. Such a belief is, however, fallacious as it cannot be accepted in any degree without serious reservation.
    • Salmon movements in Galway Bay in 1978 and 1979

      McCarthy, D T (Department of Agriculture and Fisheries (Fisheries Division), 1980)
      In 1978 tagging investigations commenced into the origin of salmon caught in drift nets in Galway Bay. This fishery began in 1969 with a catch of 355 fish and, by 1975 had increased dramatically to 33,607. However the catch declined to less than half the maximum and in 1979 was down to 15,171. There are 76 drift net licences in the Bay which incorporates two fishery districts, Galway and Connemara. The vessels used vary from 5 metre currachs to 20 metre trawlers. The majority of the boats are half deckers of between 9 and 11 metres. The fishery starts in mid-May but the bulk of the catch is taken in June and July. The main component of the catch is grilse with an average weight of 3 kg. During the period fishing is carried on over 24 hours daily except for the weekly close season time. The fishery extends from west of a straight line from Spiddal Harbour to Blackhead, Co Clare in the east , and from Slyne Head to Hag's Head, Co. Clare in the west and also incorporates the Aran Islands. Drift nets are shot at right angles to the coastline in roughly a north-south direction, all vessels staying quite close to land, the furthest distance out being 2km. The maximum length of net permitted in the area is 730 metres or 800 yards. The majority of boats fished nets of this length; however some of the smaller craft used nets as short as 300 metres. All nets are 30 meshes deep. Throughout the programme fish were tagged using Lea's hydrostatic tags described by Went (1951). As in previous tagging programmes, recovery baths were used to ensure that only the fittest fish were released after tagging.
    • Salmon Tagging in the West of Ireland 1986 to 1988

      McDermott, T (Department of the Marine, 1990-07)
      The analysis of more than twenty-six thousand micro-tag recoveries has led to important discoveries for the management of Irish salmon stocks. This Leaflet gives details of the tagging over half a million young salmon and of the results of recovering 4,000 tags from 1986 to 1988. The most important conclusions are: Careful control of place and time of release of hatchery-reared smolts has a dramatic effect on their survival. In the Corrib system, transportation of smolts from Cong to Galway resulted in a substantial improvement in yield, with a tenfold increase on one occasion. This means that up to ten times as many salmon can be produced at no increase in the cost of rearing them. The returning adult salmon produced from smolts which were released at Galway tended to stay for a long time below the Galway weir and therefore made a major contribution to the rod fishery. Marine survival fluctuated yearly for hatchery and wild smolts released. For hatchery smolts those released later survived best. In contrast wild smolts which migrated in May had a lower survival than those which left in April. Marked differences in homing accuracy, timing and speed of migration were noted between wild and hatchery smolts within the Corrib system. Drift net fisheries depend mainly on the salmon which originate from rivers nearby. There is a distinct division between the catches north and south of Galway Bay: those to the south come mostly from the rivers Shannon and Corrib, those to the north from Connemara rivers. The drift net fishery continues to rely heavily on a self sustaining population of wild salmon despite improved hatchery performance and increasing catch of cage farm escapees. Hatchery smolts transferred to different rivers learned to recognise the new river within a remarkably short time. Two weeks were sufficient to achieve a degree of homing success approaching that of fish returning to their own rivers. This discovery is of major significance in the development of salmon ranching.
    • Salmonid Stocks of the Cloonee Catchment in Co. Kerry

      Fahy, E (Department of Agriculture and Fisheries (Fisheries Division), 1978)
      An assessment of the status of the salmonids in the Cloonee system in Co Kerry is the objective of this work. The rivers and lakes make up a small coastal catchment, typical in many respects of those along the Western seaboard. The composition of its fish stocks is described; the strength of the salmonid species is evaluated and the factors which possibly affect their survival are listed. These estimates derive from observations made at a particular time but other details of the Cloonee system, its water chemistry, invertebrate community and nursery' areas of more lasting interest are also presented.
    • Sampling surveys for deep-water demersal fish in 1993

      Connolly, P L; Kelly, C J (Department of the Marine, 1994-09)
      Potential for new developments in deep water fishing have been identified by two sampling surveys carried out in April and September 1993, in the deep waters off the west coast of Ireland and Scotland. The primary objective of the two surveys was to secure samples of a variety of potentially commercial deep water fish species in order to examine aspects of their age, growth, reproduction and diet. These data will be essential in formulating management plans for the expanding deep water fisheries in the area. The surveys were conducted on a chartered fishing vessel using a commercial otter trawl, fitted with a small mesh cod-end liner. Fishing activity concentrated on the depth range 400m-1200m and a total of 81 trawling operations were carried out, of which 75 produced fish catches with limited gear damage. Fifteen species of cartilaginous and 50 species of teleost fish were recorded from the catches. These include the roundnose grenadier Coryphaenoides rupestris, black scabbard Aphanopus carbo, greater forkbeard Phycis blennoides, blue-mouth rockfish Helicolenus dactylopterus and Baird's smooth-head Alepocephalus bairdii. Length, weight, sex, maturity and catch data together with samples of otoliths, gonads and stomachs were secured. In general terms, the fishing ground off the north west of Ireland and west of Scotland caused little problems with gear damage and yielded good catches of deep water species. The two surveys have shown the areas have potential for commercial deep water fishing but the development of this fishery in the area will be contingent on the establishment of suitable markets. This initial report documents the surveys and presents some preliminary results. The data gathered from these surveys are currently under analysis at the FRC and the results will be published in the scientific literature.
    • Science and Fisheries Management

      Went, A E J (Department of Agriculture and Fisheries (Fisheries Division), 1977)
      The W.J.N. Menzies Memorial Lecture delivered at the Annual Course of the Institute of Fisheries Management at the University of East Anglia, Norwich, on 16 September, 1975.
    • Sea trout of the River Argideen

      Went, A E J (Department of Agriculture and Fisheries (Fisheries Division), 1973)
      A small collection of material consisting of scales and relevant information collected in 1964/5 from sea trout of the Argideen Rive in County Cork was examined and the results compared with those obtained in the years 1954/5.
    • The sea trout year 1980

      Fahy, E (Department of Fisheries and Forestry (Trade and Information Section), 1981)
      The fol1owing pages comprise the first of a brief and, hopefully, annual account of research in progress on sea trout, a summary of results recently available and a short account of stocks of this fish during the preceding fishing season with a tentative prognosis for the coming year. The purpose of the report is to inform user groups, anglers and netsmen, about the work and to promote an interchange of information with interested parties; a primary objective is the identification of priority research objectives and hence the promotion of better management of fisheries in which sea trout are an important or the only quarry.
    • The Sea trout Year 1981

      Fahy, E (Department of Fisheries and Forestry (Trade and Information Section), 1982)
      1981 was not a great year for sea trout landings. Rods which account for a large proportion of the total catch took fish of lower mean weight than in 1980 and various estimates suggest that fewer sea trout were caught in 1981. Numbers of "specimen" sea trout however were high and they are expected to remain so in 1982 after which it is thought they will decline. The draft net catch was also down on 1980; estimates of the drift net catch are inconclusive. In 1981 climatic factors favourable to trout production continued to improve from 1919 but indicators of growth still fell Short of those prevailing in the mid 1970s. The migration of juvenile trout to sea was good but the run seemed to consist largely of slow growing individuals whose development was arrested in 1979. A recovery of sorts would appear to be underway in the stocks and this is the explanation for the low mean weight of individuals caught in 1981. However the extended occupation of nursery areas by parr between 1919 and 1981 may well have inhibited the development of prospective migrants in 1982 and 1983.
    • The Sea Trout Year 1983

      Fahy, E (Department of Fisheries and Forestry (Trade and Information Section), 1984)
      Climatic conditions favourable to sea trout production did not improve in 1983 and juvenile output from freshwater was poor. Several years of a reduced smolt exodus have resulted in the stocks being depleted of older fish and a large proportion of the 1983 landings consisted of post-smolt (finnock). The mean smolt age has been tending upwards so that the prospect for "specimen" sea trout in the future is not good. In spite of the depleted recruitment of the past few years the yield from sea trout fisheries has remained fairly constant: the estimated total catch between 1980 and 1982 varied from 49.4 to 59.3 tonnes. A steady catch total against a background of fluctuating recruitment is due to two factors: first, the catch being a small proportion of the stocks and second, the fact that sea run trout make a divided return to fresh water.