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Predation by fallfish (Semotilus corporalis) on Pacific salmon eggs in the Salmon River, New York

Journal of Great Lakes Research

By:
, ,
DOI: 10.1016/j.jglr.2009.08.001

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Abstract

Fallfish (Semotilus corporalis) are the largest native cyprinid in the northeastern United States and are the most abundant native species in the Salmon River, New York. The Salmon River is a high-quality spawning and nursery river for Pacific salmon (Oncorhynchus spp.) migrating from Lake Ontario. Because of the large number of Pacific salmon spawning in the river in the fall extensive redd superimposition occurs resulting in salmonid eggs being available on the substrate. We examined the fall diet of 647 fallfish in 2007 and 2008 to determine the extent of predation on Pacific salmon eggs. The contribution of eggs in the diet significantly increased once fallfish attained a size of 100 mm total length. The largest size category of fallfish examined (≥150 mm) had the highest proportion (86.1%) of salmon eggs in their diet. The contribution of Zooplankton and chironomids in the diet of fallfish decreased with fish size. Except for the two largest groups of fallfish examined (i.e., 100–149 mm and ≥150 mm) diet overlap among size groups was low. The high contribution in the diet during the fall and high caloric value of Pacific salmon eggs could increase growth and survival of this species in the Salmon River.

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Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Predation by fallfish (Semotilus corporalis) on Pacific salmon eggs in the Salmon River, New York
Series title:
Journal of Great Lakes Research
DOI:
10.1016/j.jglr.2009.08.001
Volume
35
Issue:
4
Year Published:
2009
Language:
English
Publisher:
International Association for Great Lakes Research
Publisher location:
Ann Arbor, MI
Contributing office(s):
Great Lakes Science Center
Description:
4 p.
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
First page:
630
Last page:
633
Country:
United States
State:
New York
Other Geospatial:
Salmon River