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Growth, age at metamorphosis, and sex ratio of northern brook lamprey in a tributary of southern Lake Superior

Copeia

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Abstract

Growth was studied of five year classes of the northern brook lamprey, Ichthyomyzon fossor, collected from the Sturgeon River during intervals between treatment of the stream with a lampricide. Growth varied considerably among year classes. Larvae of the 1963 year class were slightly longer at age II and 30% longer at age III than the III-group larvae of the 1960 year class. About 6% of 558 III-group lampreys of the 1963 year class had metamorphosed by 17 August 1966. Although the sex ratio of larvae was about 1:1, 97% of the metamorphosed lampreys were males. The distribution of pigmentation on the caudal fin and upper lip in ammocoetes less than 40 mm long permitted accurate and rapid separation of northern brook lampreys from the sea lamprey, Petromyzon marinus.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Growth, age at metamorphosis, and sex ratio of northern brook lamprey in a tributary of southern Lake Superior
Series title:
Copeia
Volume
1970
Issue:
2
Year Published:
1970
Language:
English
Contributing office(s):
Great Lakes Science Center
Description:
p. 326-332
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Copeia
First page:
326
Last page:
332