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Recoveries of tagged, hatchery-reared lake trout from Lake Superior

Transactions of the American Fisheries Society

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DOI:10.1577/1548-8659(1961)90[404:ROTHLT]2.0.CO;2

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Abstract

Plantings that totaled 13,384 tagged, hatchery-reared lake trout (Salvelinus namaycush)—18, 25, 30, or 37 months old—were made at four Lake Superior localities in 1955-57 to: measure possible increases of return from rearing to greater size and age; study the effect of season of planting on the rate of return; compare returns from different types of tags; and follow the movements of hatchery-reared fish. The great advantage of spring over fall planting, demonstrated for fingerling lake trout in earlier experiments, did not hold for fish planted at ages of 18 to 37 months. The improvement of recovery rates with increase of age over the same 18- to 37-month interval appears to be too small to justify the cost of rearing to the higher ages. The recovery rates were closely similar (3.9 to 4.8 percent) for lower-jaw tags and two types of nylon-streamer tags but were much lower than the rate for Petersen tags (12.4 percent). The pins of Petersen tags render the fish highly vulnerable to entanglement in the webbing of gill nets, the principal gear in Lake Superior. Recoveries of Petersen tags also came earlier after planting than did those of other tags. The time between planting and recovery and the distance traveled by the fish were clearly but not closely correlated. Mean distance between points of planting and recovery increased with time out, and average time out increased with the number of miles traveled. More than half of the recoveries of fish that had been at liberty over 2 years were made within 25 miles of the point of release.

Additional publication details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Recoveries of tagged, hatchery-reared lake trout from Lake Superior
Series title:
Transactions of the American Fisheries Society
DOI:
10.1577/1548-8659(1961)90[404:ROTHLT]2.0.CO;2
Volume:
90
Issue:
4
Year Published:
1961
Language:
English
Publisher:
Taylor & Francis
Contributing office(s):
Great Lakes Science Center
Description:
9 p.
First page:
404
Last page:
412
Online Only (Y/N):
N
Additional Online Files (Y/N):
N