Effect of size on lake trout survival after a single sea lamprey attack
Transactions of the American Fisheries Society
None
By: William D. Swink
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Abstract
When lake trout Salvelinus namaycush were subjected to a single attack by a sea lamprey Petromyzon marinus in laboratory tests in 1986, percentage mortality was significantly higher in small fish (64%; 469-557 mm; N = 67) than in medium (44%; 559-643 mm; N = 45) or large fish (43%; 660-799 mm; N = 47). Additional studies conducted in 1987 with 55 medium (559-650 mm) and 52 large (660-825 mm) lake trout confirmed that there was no difference in mortality between the two larger size-groups. Mortality declined in lake trout over 559 mm, but was still greater than 43%. This level of mortality and the sea lampreys' apparently active selection of larger fish indicated that, contrary to previously published opinions, large size in lake trout (up to ∼800 mm in length) might not allow better survival from single sea lamprey attacks.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Effect of size on lake trout survival after a single sea lamprey attack |
| Series title | Transactions of the American Fisheries Society |
| DOI | 10.1577/1548-8659(1990)119<0996:EOLTSO>2.3.CO;2 |
| Volume | 119 |
| Issue | 6 |
| Year Published | 1990 |
| Language | English |
| Publisher | Taylor & Francis |
| Publisher location | Philadelphia, PA |
| Contributing office(s) | Upper Midwest Environmental Sciences Center |
| Description | 7 p. |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Transactions of the American Fisheries Society |
| First page | 996 |
| Last page | 1002 |