• Comparison of the effects of exploitation on theoretical long-lived fish species with different life-history strategies and the implications for management

      Codling, E.A.; Kelly, C.J.; Clarke, M. (International Council for the Exploration of the Sea (ICES), 2005)
      A stage-based simulation model is used to investigate the effect of exploitation on theoretical populations representing long-lived elasmobranch and teleost species with different life-history strategies. A comparison is made between the effect of exploitation on the elasmobranch ‘k-strategists’ and other teleost species that are ‘r-strategists’. We demonstrate the effects of stage-based exploitation on a typical long-lived elasmobranch population and discuss the implications of this when designing a management plan to ensure survival of the stock.
    • The deep water fisheries of the Rockall trough: some insights gleaned from Irish survey data

      Kelly, C.J.; Connolly, P.L.; Clarke, M.W. (International Council for the Exploration of the Sea (ICES), 1998)
      The Fisheries Research Centre (FRC) has conducted trawl and longline surveys in the Rockall Trough since 1993, fishing a total of 223 stations over the depth range 201 to 4,945m. Trawls produced greater species diversity and higher discard rates than longlines, which selected larger squalifurm sharks. In 1997, limited selectivity work, based on ten comparative tows, showed that the size range of roundnose grenadier (Coryphaenoides rupestris) caught using a commercial trawl (llOmm), with and without a small mesh end liner (30mm), were similar. This indicates that mesh size, because of poor selectivity and perceived low survival rates of escapees, may not be a useful management tool in the regulation of the trawl fishery.