Reduced bycatch of red king crab (Paralithodes camtschaticus) in the gillnet fishery for cod (Gadus morhua) in northern Norway

摘要: Abstract Bycatches of red king crab (Paralithodes camtschaticus) in stationary fishing gears, especially gillnets, are a growing problem for inshore fishermen northern Norway. Large bycatches crabs cause extra work the and damage their gear catch. In cod (Gadus morhua) gillnet fisheries, could be solved by designing gillnets that float above seabed (“norsel-mounted” nets). Norsel-mounted nets floating 0.5 m were compared with standard Varangerfjord (eastern Finnmark) three periods. first period catches generally small norsel caught 52% fewer than nets; it was also shown needed more floats to stand properly sea. By using flotation (rings) on certain during second period, reduced an acceptable level, catch per unit effort (CPUE) 0.5 3.0 placement. Norsel 66% nets. During third used both norsels had CPUE 0.7 crabs, 2.4 crabs; 31% larger cod, thus differences between net types less terms weight. Additional data collected coastal vessels operating under different conditions (area bottom topography), showed fished about same number 58% This study indicates configuration capable reducing bycatch crab. Reduction fish largest periods poor fishery, area may have influenced catchability greater degree