• Culture of surfclams Spisula solidissima sp., in coastal Georgia: nursery culture

      O'Beirn, F.X.; Walker, R.L.; Hurley, D.H.; Moroney, D.A. (National Shellfisheries Association, 1997)
      Growth of the Atlantic surfclam, Spisula solidissima solidissima, was compared with that of the southern Atlantic surfclam, Spisula solidissima similis. All experimental animals were reared in upweller units at 20°C and fed cultured algae on a daily basis. Over the 14 wk of the study, the Atlantic surf clams grew markedly better (8.9-mm increase in shell length and a 1,103% increase in biomass) than the southern Atlantic surfclams (6.6-mm increase in shell length and 573% mcrease in biomass). Mortality for both groups was negligible. The mean shell lengths attained for the Atlantic surfclams (15.3 mm) and the southern Atlantic surfclams (13 mm) at the conclusion of the study were large enough to ensure good growth and survival on relocation to a field growout environment. The growth patterns obtained under similm growth conditions further highlight some basic life history differences between these subspecies, which were apparent from other studies.
    • Distribution, population structure, growth and reproduction of the razor clam Ensis arcuatus (Jeffreys) (Solenaceae) in coastal waters of western Ireland

      Fahy, E.; Norman, M.; Browne, R.; Roantree, V.; Pfeiffer, N.; Stokes, D.; Carroll, J.; Hannaffy, O. (Marine Institute, 2001)
      Samples of razor clams, Ensis arcuatus, the species which makes up the majority of landings from the west coast of Ireland, were collected by commercial fishery methods, in association with the dredge fishery and by scuba diving, from three locations off the coast of Co Galway. E. arcuatus occupies coarse sand (of maerl and shell fragments) and rarely co-exists with the other common species of the region, E. siliqua. E. arcuatus were aged, an age-length-key devised for them, and growth parameters (Linf, k and t0) were calculated. Their maturation state was established by histological examination. Evidence suggests that Ensis arcuatus is mainly a spring spawner, although some spawning appears to take place in most months, with a spatfall in June/July. Maturation commences in its third year. Asymptotic length is achieved at 10 years, approximately, and there was little variability in growth among the three sampling areas or between the sexes. In a small bed of razor clams in Cill Chiarain Bay, Co Galway, there would appear to have been a spatfall in most, if not all, of the past 15 years. The quantitative distribution of E. arcuatus in a single bay within the boundaries of Comharchuman Sliogeisc Chonamara Teo, Co Galway, was estimated by divers salting quadrats of 0.33 m2. The razor clam community is divided into a generally distributed fraction occurring at low density (described as the non-bed) and at a relatively higher density (described as the clam bed). The bed was situated in the lee of reefs, which is usually the case for this species along the Atlantic seaboard. More than 90% of the biomass was above the E.U. minimum size limit.
    • Shellfish Stocks and Fisheries Review 2009

      Marine Institute; Bord Iascaigh Mhara (Marine Institute & Bord Iascaigh Mhara, 2010)
      This review presents information on the status and activity of shellfisheries in Ireland. Legislation, fisheries management and licencing regimes that impinge on the operation of shellfisheries are reviewed and data on landings, value and profitability are presented. Stock assessment data, for a selected number of species, is updated and management recommendations are presented where appropriate. The intention is to update the review annually and present stock assessment and scientific advice particularly for shellfisheries which may be subject to new management proposals or where scientific advice is required in relation to assessing the environmental impact of shellfisheries especially in conservation areas designated under European Directives. The scope of the review extends into a description of fisheries and fleet activity and presents economic data for the fleet and separately for individual fisheries where available. It also presents details of legislation, in the area of fisheries, environment, and food safety that impinges on the activity of the fleet. This coupling of information on stocks (dealing with issues of biological conservation and sustainability) and fisheries (dealing with socio-economic issues and the variability of the fleet) is seen as important in the co-management framework, the overall objective of which is to develop, in parallel, sustainable and viable fisheries for shellfish within the Irish territorial limits. Not all shellfish species are included in the 2009 review. Although an overview of legislation, landings and economic data are given, that relate to all species, stock indicators are presented for a limited number of fisheries. The inclusion of species/stocks is based on data availability and in response to developments or initiatives in management. The annual review will evolve towards informing fishery management plans as they are developed and implemented by the Shellfish Advisory Groups.
    • Shellfish Stocks and Fisheries Review 2010

      Marine Institute (Marine Institute, 2011)
      This review presents information on the status of selected shellfisheries in Ireland. In addition data on the fleet (<13m) and landings for all species are presented.
    • Shellfish Stocks and Fisheries Review 2011: An assessment of selected stocks

      Marine Institute; Bord Iascaigh Mhara (Marine Institute and Bord Iascaigh Mhara, 2012)
      This review presents information on the status of selected shellfish stocks in Ireland. In addition data on the fleet (<13m) and landings for all species of shellfish (excluding Nephrops) are presented. The intention of the annual reviews is to present stock assessment and scientific advice for shellfisheries which may be subject to new management proposals or where scientific advice is required in relation to assessing the environmental impact of shellfisheries especially in conservation areas designated under European Directives.
    • Shellfish Stocks and Fisheries Review 2012: An assessment of selected stocks

      Marine Institute; Bord Iascaigh Mhara (Marine Institute & Bord Iascaigh Mhara, 2014)
      This review presents information on the status of selected shellfish stocks in Ireland. In addition data on the fleet (<13m) and landings for all species of shellfish (excluding Nephrops and mussels) are presented. The intention of the annual reviews is to present stock assessment and scientific advice for shellfisheries which may be subject to new management proposals or where scientific advice is required in relation to assessing the environmental impact of shellfisheries especially in conservation areas designated under European Directives.
    • Shellfish Stocks and Fisheries Review 2014: An assessment of selected stocks

      Marine Institute; Bord Iascaigh Mhara (Marine Institute and Bord Iascaigh Mhara, 2015)
      This review presents information on the status of selected shellfish stocks in Ireland. In addition, data on the fleet (<13 m) and landings for all species of shellfish (excluding Nephrops and mussels) are presented. The intention of this annual review is to present stock assessment and scientific advice for shellfisheries which may be subject to new management proposals or where scientific advice is required in relation to assessing the environmental impact of shellfisheries especially in areas designated under European Directives.
    • Shellfish Stocks and Fisheries Review 2015: an assessment of selected stocks

      Marine Institute; Bord Iascaigh Mhara (Marine Institute and Bord Iascaigh Mhara, 2015)
      This review presents information on the status of selected shellfish stocks in Ireland. In addition, data on the fleet (<13 m) and landings for all species of shellfish (excluding Nephrops and mussels) are presented. The intention of this annual review is to present stock assessment and scientific advice for shellfisheries which may be subject to new management proposals or where scientific advice is required in relation to assessing the environmental impact of shellfisheries especially in areas designated under European Directives.