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Lake trout restoration in the Great Lakes: stock-size criteria for natural reproduction

Journal of Great Lakes Research

By:
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Abstract

We examined the question of whether the lake trout restoration program in the Great Lakes has developed brood stocks of adequate size to sustain natural reproduction. Stock size criteria were developed from areas of the Great Lakes where natural reproduction has been successful (defined as detection of age-1 or older recruits by assessment fishing). We contrasted them with stocks in areas with no natural reproduction. Based on the relative abundance of spawners measured in the fall and the presence or absence of natural reproduction in 24 areas of the Great Lakes, we found three distinct sets of lake trout populations. In seven areas of successful natural reproduction, the catch-per-unit-effort (CPE) of spawners ranged from 17 to 135 fish/305 m of gillnet. Stock sizes in these areas were used as a gauge against which stocks in other areas were contrasted. We conclude that stock densities of 17-135 fish/305 m of gill net are adequate for natural reproduction, provided that all other requirements are met. No natural reproduction has been detected in seven other areas, where CPEs of spawners ranged from only 3 to 5 fish/305 m. We conclude that spawning stocks of only 3-5 fish/305 m of net are inadequate to develop measurable natural reproduction. Natural reproduction has also not been detected in ten areas where CPEs of spawners ranged from 43 to 195 fish/305 m of net. We conclude that spawning stocks in these ten areas were adequate to sustain natural reproduction, but that some factor other than parental stock size prevented recruitment of wild lake trout.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Lake trout restoration in the Great Lakes: stock-size criteria for natural reproduction
Series title:
Journal of Great Lakes Research
Volume
21
Year Published:
1995
Language:
English
Contributing office(s):
Great Lakes Science Center
Description:
p. 498-504
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
First page:
498
Last page:
504
Number of Pages:
6