Movements of Atlantic Halibut (Hippoglossus hippoglossus) in the Canadian North Atlantic

1988 ◽  
Vol 45 (3) ◽  
pp. 484-491 ◽  
Author(s):  
Wayne T. Stobo ◽  
John D. Neilson ◽  
Patricia G. Simpson
Keyword(s):  
North Atlantic ◽  
Atlantic Halibut ◽  
Scotian Shelf ◽  
Hippoglossus Hippoglossus ◽  
Spawning Grounds ◽  
Northwest Atlantic ◽  
Preferred Direction ◽  
Pacific Halibut ◽  
Hippoglossus Stenolepis ◽  
Direction Of Movement

The results of Atlantic halibut (Hippoglossus hippoglossus) tagging experiments conducted in Northwest Atlantic Fisheries Organization (NAFO) Subareas 3 and 4 between 1958 and 1973 were reexamined. Data from the 230 recaptures indicated a tendency for fish released on the Scotian Shelf to move to the northeast, while fish released on the Newfoundland Grand Bank showed no preferred direction of movement. The Laurentian Channel does not appear to be a barrier to migration for this species. Small (<75 cm) fish moved further than larger fish. The seemingly limited movement by larger fish may be due to acyclic annual migration between feeding and spawning grounds, similar to that suggested for Pacific halibut (Hippoglossus stenolepis). The extensive movement of Atlantic halibut throughout most of the Canadian Northwest Atlantic suggests that a single area would be the most feasible management unit, encompassing the Scotian Shelf and southern Grand Bank regions.

Proximate Composition of Canadian Atlantic Fish: I. Variation in Composition of Different Sections of the Flesh of Atlantic Halibut (Hippoglossus hippoglossus)

1961 ◽  
Vol 18 (4) ◽  
pp. 483-493 ◽  
Author(s):  
A. Mannan ◽  
D. I. Fraser ◽  
W. J. Dyer
Keyword(s):  
Lipid Content ◽  
Atlantic Halibut ◽  
White Meat ◽  
Dark Muscle ◽  
Hippoglossus Hippoglossus ◽  
Low Protein ◽  
Pacific Halibut ◽  
High Lipid ◽  
Hippoglossus Stenolepis ◽  
Lateral Lines

The composition of various portions of the edible flesh of Atlantic halibut (Hippoglossus hippoglossus) varies greatly, especially in lipid content. The muscle of the belly flap and the dark muscle along the lateral lines in the upper and lower sides have a high lipid content, 2.4 to 9.7%, with correspondingly lower moisture content, about 68 to 75%, and a slightly low protein content, about 16.3 to 19% (protein N × 6.25) in comparison with the light meat. The latter, which makes up the larger part of the edible tissue, nearly 90%, ranges from 0.9 to 1.4% lipid, 75 to 77% moisture and 17.5 to 20.3% protein. These values are almost identical to those for Pacific halibut (Hippoglossus stenolepis). Non-protein nitrogenous extractives are also lower in the white meat.The figures most often quoted in nutritional tables for the lipid content of halibut (5 to 6%) are probably much too high for the portions usually eaten, which average about 1.2% for the white meat, and about 1.5% if the dark meat is included.

Redescription of Lophoura gracilis (Wilson, 1919) (Copepoda: Sphyriidae) from Synaphobranchus kaupi in the Northwest Atlantic Ocean

1985 ◽  
Vol 63 (12) ◽  
pp. 2940-2943 ◽  
Author(s):  
William E. Hogans ◽  
Michael J. Dadswell
Keyword(s):  
Atlantic Ocean ◽  
North Atlantic ◽  
Original Description ◽  
The Other ◽  
Valid Species ◽  
Scotian Shelf ◽  
Northwest Atlantic

The mesoparasitic copepod Lophoura gracilis is redescribed from eight female specimens recovered from synaphobranchid eels captured at 600 m on the Scotian Shelf. This is the first documentation of L. gracilis since the original description. We conclude that L. gracilis is a valid species distinct from the other North Atlantic representatives of this genus.

Helminth parasites of the alimentary tract of Atlantic halibut (Hippoglossus hippoglossus L.) and Greenland halibut (Reinhardtius hippoglossoides (Walbaum)) on the Scotian Shelf

1989 ◽  
Vol 67 (6) ◽  
pp. 1476-1481 ◽  
Author(s):  
James S. Scott ◽  
Shelley A. Bray
Keyword(s):  
Parasite Prevalence ◽  
Fish Length ◽  
Atlantic Halibut ◽  
Helminth Parasites ◽  
Intermediate Hosts ◽  
Scotian Shelf ◽  
Greenland Halibut ◽  
Hippoglossus Hippoglossus ◽  
Greenland Halibut Reinhardtius Hippoglossoides ◽  
Reinhardtius Hippoglossoides

Examination of the alimentary tracts of 272 Atlantic halibut (Hippoglossus hippoglossus (L.)) and 71 Greenland halibut (Reinhardtius hippoglossoides (Walbaum)) from the Scotian Shelf yielded a total of 25 helminth parasite species, 23 from H. hippoglossus (16 Digenea, 3 Cestoda, 2 Acanthocephala, 2 Nematoda) and 16 from R. hippoglossoides (11 Digenea, 3 Cestoda, 1 Acanthocephala, 1 Nematoda). Parasite prevalence and intensity were low (< 50% and < 10%, respectively) in both hosts, except for Derogenes varicus and Steganoderma formosum in H. hippoglossus and anisakid nematodes in R. hippoglossoides. Consideration of change in parasite prevalence and mean intensity in relation to fish length and diet suggests fish prey as transport hosts for D. varicus in larger halibuts, and crustaceans as the intermediate hosts for S. formosum before transmission to its principal host, H. hippoglossus. Geographical change in parasite prevalence and intensity was in the form of southwest to northeast clines along the Shelf, probably related to environmental factors. There was no evidence for stock differentiation in either of the hosts based on parasite fauna.

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