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Age, Growth, Maturity, and Fecundity of Humper Lake Trout, Isle Royale, Lake Superior

Age, Growth, Maturity, and Fecundity of Humper Lake Trout, Isle Royale, Lake Superior Humper lake trout are one of the several races or subpopulations of lake trout in Lake Superior. This study is based on 3,705 fish collected on a reef south of Isle Royale near the eastern end. The mean lengths of humper trout from commercial gill nets were smaller than those of lean lake trout. Members of age‐groups VII, VIII, and IX represented 81.5 per cent of the commercial humper catch. The body‐scale relation was described by two intersecting straight lines. The weight of humper trout increased as the 3.282 power of the length. Growth in length was slow and ranged from 1.6 to 3.5 inches per year. Annual increments were greatest in the first, sixth, and seventh years. Growth in weight was also slow but increased each year. Humper trout became legal (1 1/2 pounds) in the eighth year of life and reached 5 pounds in 11 years. All fish longer than 19.1 inches and older than age‐group VIII were mature; the shortest mature fish were: males, 12.7 inches; females, 14.7 inches. At minimum legal size, 98 per cent of the males and 56 per cent of the females were mature. Humper trout produced an average of 1,351 eggs per fish or 516 per pound. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Transactions of the American Fisheries Society Oxford University Press

Age, Growth, Maturity, and Fecundity of Humper Lake Trout, Isle Royale, Lake Superior

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References (7)

Publisher
Oxford University Press
Copyright
© American Fisheries Society
ISSN
0002-8487
eISSN
1548-8659
DOI
10.1577/1548-8659(1965)94[75:agmafo]2.0.co;2
Publisher site
See Article on Publisher Site

Abstract

Humper lake trout are one of the several races or subpopulations of lake trout in Lake Superior. This study is based on 3,705 fish collected on a reef south of Isle Royale near the eastern end. The mean lengths of humper trout from commercial gill nets were smaller than those of lean lake trout. Members of age‐groups VII, VIII, and IX represented 81.5 per cent of the commercial humper catch. The body‐scale relation was described by two intersecting straight lines. The weight of humper trout increased as the 3.282 power of the length. Growth in length was slow and ranged from 1.6 to 3.5 inches per year. Annual increments were greatest in the first, sixth, and seventh years. Growth in weight was also slow but increased each year. Humper trout became legal (1 1/2 pounds) in the eighth year of life and reached 5 pounds in 11 years. All fish longer than 19.1 inches and older than age‐group VIII were mature; the shortest mature fish were: males, 12.7 inches; females, 14.7 inches. At minimum legal size, 98 per cent of the males and 56 per cent of the females were mature. Humper trout produced an average of 1,351 eggs per fish or 516 per pound.

Journal

Transactions of the American Fisheries Society – Oxford University Press

Published: Jan 1, 1965

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