Diet of Burbot in Green Bay and Western Lake Michigan With Comparison to Other Waters
Identifieur interne : 001003 ( Main/Exploration ); précédent : 001002; suivant : 001004Diet of Burbot in Green Bay and Western Lake Michigan With Comparison to Other Waters
Auteurs : Thomas W. Fratt [États-Unis] ; Daniel W. Coble [États-Unis] ; Fred Copes [États-Unis] ; Richard E. Bruesewitz [États-Unis]Source :
- Journal of Great Lakes Research [ 0380-1330 ] ; 1996.
English descriptors
- KwdEn :
Abstract
We determined foods eaten and factors influencing the diet of burbot (Lota lota) and compared our results with those of other studies to help assess the role of burbot in the fish community of Lake Michigan. We examined stomachs of 3,570 burbot of 215845 mm total length caught by 10 methods from 5 areas of Green Bay and western Lake Michigan in depths of 1 to 160 m during September 1986 to November 1988. Fish composed 94% of the volume of the diet; percent volumes of fish identifiable to genus or species were alewife (Alosa pseudoharengus), 31; rainbow smelt (Osmerus mordax), 25; bloater (Coregonus hoyi), 13; sculpins of the genus, Cottus, 11; deepwater sculpin (Myoxocephalus thompsoni), 8; yellow perch (Perca flavescens), 8; other fish, 5. Cottus spp. were more important than their volume indicated because they were the most frequently occurring fish. Important invertebrates were Mysis relicta, found in 26% of the burbot containing food, and Pontoporeia hoyi. The diet varied with size of burbot, i.e., invertebrates were more important for the smaller burbot, and with area and depth of capture. Alewives were more important at depths of 2039 m than at shallower and deeper depths. In waters exceeding 40 m depth the diet of burbot in Lake Michigan seemed to have changed little since the 1930s, and it was similar to the diet of burbot in Lake Superior in the 1960s. Foods commonly important for burbot in many waters in North America are sculpins, coregonids other than lake whitefish (Coregonus clupeaformis), Pontoporeia spp., M. relicta, and yellow perch, and crayfish outside of the Great Lakes. Trout and salmon (Salmo spp., Salvelinus spp., Oncorhynchus spp.) and suckers (Catostomus spp.) were inconsequential in the diet of burbot in Lake Michigan, and they have not been found to be important in the diet of burbot in other studies.
Url:
DOI: 10.1016/S0380-1330(97)70880-3
Affiliations:
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<front><div type="abstract" xml:lang="en">We determined foods eaten and factors influencing the diet of burbot (Lota lota) and compared our results with those of other studies to help assess the role of burbot in the fish community of Lake Michigan. We examined stomachs of 3,570 burbot of 215845 mm total length caught by 10 methods from 5 areas of Green Bay and western Lake Michigan in depths of 1 to 160 m during September 1986 to November 1988. Fish composed 94% of the volume of the diet; percent volumes of fish identifiable to genus or species were alewife (Alosa pseudoharengus), 31; rainbow smelt (Osmerus mordax), 25; bloater (Coregonus hoyi), 13; sculpins of the genus, Cottus, 11; deepwater sculpin (Myoxocephalus thompsoni), 8; yellow perch (Perca flavescens), 8; other fish, 5. Cottus spp. were more important than their volume indicated because they were the most frequently occurring fish. Important invertebrates were Mysis relicta, found in 26% of the burbot containing food, and Pontoporeia hoyi. The diet varied with size of burbot, i.e., invertebrates were more important for the smaller burbot, and with area and depth of capture. Alewives were more important at depths of 2039 m than at shallower and deeper depths. In waters exceeding 40 m depth the diet of burbot in Lake Michigan seemed to have changed little since the 1930s, and it was similar to the diet of burbot in Lake Superior in the 1960s. Foods commonly important for burbot in many waters in North America are sculpins, coregonids other than lake whitefish (Coregonus clupeaformis), Pontoporeia spp., M. relicta, and yellow perch, and crayfish outside of the Great Lakes. Trout and salmon (Salmo spp., Salvelinus spp., Oncorhynchus spp.) and suckers (Catostomus spp.) were inconsequential in the diet of burbot in Lake Michigan, and they have not been found to be important in the diet of burbot in other studies.</div>
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