Deep-water fisheries of the North Atlantic oceanic slope : by Alan G Hopper

By Alan G Hopper

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They concluded that roundnose grenadier do not follow their prey up into the water colurnn at night, but remain close to the bottom resulting in higher catch rates during that time. As their food descends closer to the bottom, the fish move up somewhat to feed resulting in lower catch rates during the day. Savvatimsky (1985) also concluded that these fish exhibit diel movements off the bottom, but in contrast to the conclusions above, reported that catches were generally smaller at night in both the north west and north east Atlantic.

A (1990) 'Ecology ofthe fishes ofthe Norwegian Deep: Distribution and species assemblages', Netherlands Journal of Sea Research, 25(112), 237-266. M. (1994) 'Deep-water ichthyoplankton of the Skagerrak with special reference to Coryphaenoides rupestris Gunnerus, 1765 (Pisces, Macrouridae) and Argentina silus (Ascanius, 1775) (Pisces, Argentinidae)', Sarsia, 78, 000-000. A and Isaksen, B. (1987) 'Deep-water resources of the Northeast Atlantic: Distribution, abundance and exploitation', Fisken og Havet, 1987(3), 1-56.

Because the shelf species were commonly associated, trawls which took the dominant commercial species caught and killed numbers of the less abundant non-commercial species at the same time. Average Size, gm 200~-----------------------------------' 150 100 '. . . . . .. ... . . ... OL--L__ 79 80 L-~ 81 -- _ _~~_ _J-~_ _~~_ _~~~~ 82 83 84 85 86 87 88 89 90 91 YEAR - Centroscyllium • - Macrourus _. Nezumia + Antimora Figure 8. Mean sizes (gm/individual) of selected typical upper slope species in the Deep Group, 1979 to 1991.

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