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Predation on stocked Atlantic salmon (Salmo salar) fry

Canadian Journal of Fisheries and Aquatic Sciences

By:
,
DOI: 10.1139/f03-001

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Abstract

We studied predator-prey interactions between juvenile Atlantic salmon (Salmo salar) and trout in three Massachusetts, U.S.A., streams and in artificial streams. We sampled stomach contents of age-1+ and older salmon and trout (Salvelinus fontinalis, Salmo trutta) following salmon fry stocking in the spring of 1997 and 1998. Between 4.3 and 48.6% of the stocked fry were consumed within the first 2 days after stocking, and total fry mortality from predation varied from 4.3 to 60.7%. No significant differences were found between stomach weights of predators (without fry weight) that consumed fry and those that did not. Artificial stream experiments testing effects of habitat complexity and predator species on predator consumption rates revealed that consumption rates were not different between brook (S. fontinalis) and brown (S. trutta) trout (p = 0.59). Predation rate tended to decrease as the percentage of riffle habitat increased but the decrease was not significant (p = 0.22). Our results indicate that predation on stocked Atlantic salmon fry can be substantial (up to 60%), appears to be short lived (2 days), and is not related in a simple way to abiotic and biotic factors.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Predation on stocked Atlantic salmon (Salmo salar) fry
Series title:
Canadian Journal of Fisheries and Aquatic Sciences
DOI:
10.1139/f03-001
Volume
60
Issue:
1
Year Published:
2003
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
First page:
32
Last page:
42
Number of Pages:
11