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January 1, 1952

Use of electricity in the control of sea lampreys: electromechanical weirs and traps and electrical barriers Use of electricity in the control of sea lampreys: electromechanical weirs and traps and electrical barriers

No abstract available.

Authors

Vernon C. Applegate, Bernard R. Smith, Willis L. Nielsen

Ecosystems Mission Area, Great Lakes Science Center

January 1, 1952

Movements of yellow perch marked in southern Green Bay, Lake Michigan, in 1950 Movements of yellow perch marked in southern Green Bay, Lake Michigan, in 1950

To obtain information on the post-spawning movements of yellow perch that spawn in southern Green Bay, Lake Michigan, 4,172 fish caught in drop nets were marked by tagging with monel-metal strap tags attached to the right operculum and 24,799 were marked by clipping off the second or membranous dorsal fin. Marking was done during the period from May 3 to 17, 1950, at six main stations...

Authors

Donald Mraz

Ecosystems Mission Area, Great Lakes Science Center

January 1, 1952

Changes in the lake trout fishery in the three upper lakes Changes in the lake trout fishery in the three upper lakes

Abstract has not been submitted

Authors

Ralph Hile

Ecosystems Mission Area, Great Lakes Science Center

January 1, 1952

Sea lamprey spawning; Michigan streams of Lake Superior Sea lamprey spawning; Michigan streams of Lake Superior

No abstract available.

Authors

Howard A. Loeb, Albert E. Hall

Ecosystems Mission Area, Great Lakes Science Center

January 1, 1952

A method of marking larval lampreys A method of marking larval lampreys

Biological investigations of lamprey populations in central New York have indicated a need for developing a method of marking larvae of the sea lamprey, Petromyzon marinus Linnaeus, and the American brook lamprey, Lampetra lamottei (Lesueur) Since lamprey larvae live in burrows in the soft sediments of the stream bottom, the use of an external tag is impractical.

Authors

Roland L. Wigley

Ecosystems Mission Area, Great Lakes Science Center

January 1, 1952

Diseases and parasites of the sea lamprey, Petromyzon marinus, in the Lake Huron basin Diseases and parasites of the sea lamprey, Petromyzon marinus, in the Lake Huron basin

Sea lampreys from the Lake Huron basin carried no external parasites and showed a fairly low degree of infection by internal parasites. The material examined represented three life-history stages of the sea lamprey. Recently transformed downstream migrants (215 specimens) harbored only nematodes belonging to the genus Camallanus. The percentage of infection was 2.3. Active feeders from...

Authors

Alberton L. McLain

Ecosystems Mission Area, Great Lakes Science Center

January 1, 1952