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The character of the seabed can vary considerably from one area to the next and fishers distinguish fishing grounds based on the bottom type, depth and on the expected catch composition. Marine Institute fisheries observers record the names used for these grounds and although the names may vary between fishers and some grounds have no distinct boundaries, patterns emerge when the observer records are overlaid over fishing effort data from Vessel Monitoring Systems (VMS) and catch composition data from the logbooks.<\/SPAN><\/P>

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The seabed around Ireland gradually slopes down towards a depth of around 200m (continental shelf) after which it slopes steeply to the abyssal depth of the ocean floor. A large number of species are caught in the waters of the continental shelf, including Nephrops, cod, haddock, whiting, megrim, plaice, black sole, herring and boarfish. Along the shelf edge, species like anglerfish and hake are targeted as well as mackerel and horse mackerel, which migrate to the Irish shelf edge to spawn. Tuna and blue whiting are mainly caught in waters beyond the continental slope.<\/SPAN><\/P>

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