. The Canadian field-naturalist. Natural history. 2002 O'Dea and Haedrich: Atlantic Wolfhsh in Canada 429 Landings, 10001 25. 50 55 60 65 70 75 80 85 90 95 Year Figure 5. History of the northwest Atlantic fishery for Atlantic Wolffish, Anarhichas lupus, 1950-1996. FAO Data. The Soviet Union and East Germany were essentially out of the picture by the early 1980s, and by 1990 Greenland had seriously curtailed its fishing efforts as well. In recent years, from 1990 through 1996, Portugal has become the major participant in a much reduced fishery. Apart from the direct adverse impact of fisheries
. The Canadian field-naturalist. Natural history. 2002 O'Dea and Haedrich: Atlantic Wolfhsh in Canada 429 Landings, 10001 25. 50 55 60 65 70 75 80 85 90 95 Year Figure 5. History of the northwest Atlantic fishery for Atlantic Wolffish, Anarhichas lupus, 1950-1996. FAO Data. The Soviet Union and East Germany were essentially out of the picture by the early 1980s, and by 1990 Greenland had seriously curtailed its fishing efforts as well. In recent years, from 1990 through 1996, Portugal has become the major participant in a much reduced fishery. Apart from the direct adverse impact of fisheries on Atlantic Wolffish, human activities also have indirect and detrimental effects on this species. The groundfish trawls, generally otter trawls, in which wolffish are caught can result in incidental mortality and damage to fish which come in contact with the mobile fishing gear but are not caught. Perhaps even more importantly, the steel doors or otterboards of the net, along with heavy bottom lines and rollers, scour the seabed as they are dragged across it (Watling and Norse 1998). This practice may cause significant habitat damage by removing or re- distributing the rocks and boulders under which these fish shelter, spawn and build nests. Studies on Georges Bank (Collie et al. 1997) and in the Gulf of Maine (Auster et al. 1996), areas within the southern limit of the Atlantic Wolffish's range, show the considerable degree of damage that can result from bottom dragging there. Jennings and Kaiser (1998) provide an excellent overview of the entire question of fishing impacts on habitat; they point out that these can vary quite a bit depending on local condi- tions, but suggest that the greatest and most lasting impacts are most likely to occur on hard substrates in deep water; , just those habitats favoured by the Atlantic Wolffish. Bottom trawling for fish and dredging for scallops and clams, in addition to digging up and disrupting bottom habitats, also re-suspends botto
Size: 2436px × 1026px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectnaturalhistory, booky
