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- Title
An Investigation into Fish Escapement from a Small Impoundment through a Pipe Spillway and Implications for Predatory Impacts on Small Stream Fishes.
- Authors
Williams, Scott C.
- Abstract
Escape of predatory fish from impoundments and their impact on native stream fishes, especially threatened and endangered fish, are concerns of fishery managers. This investigation was designed to identify if fish, especially predatory fish, would escape from an impoundment with a surface withdrawal spillway pipe, and enter a stream. From March 16, 2005 through June 2, 2006, all discharge from the impoundments was forced to flow through a steel cage constructed of one-half inch steel mesh, which trapped escaping fish consisting of 37 largemouth bass Micropterus salmoides, 141 bluegill Lepomis macrochirus, and 197 green sunfish Lepomis cyanellus. The average sizes of largemouth bass, bluegill and green sunfish caught were 3.9 inches (range 2.5 to 10.5 inches), 1.4 inches (range 0.75 to 2.5 incites), and 2.2 inches (range 1.3 to 3.3 inches), respectively. Most of the fish escapement occurred during the months of April, May, and September when discharge was highest. Thus fish can readily escape through a surface withdrawal spillway pipe during periods of discharge.
- Subjects
FISHES; SPILLWAYS; PREDATORY animals; FISHERIES; LARGEMOUTH bass; BLUEGILL
- Publication
Transactions of the Missouri Academy of Science, 2008, Vol 42, p7
- ISSN
0544-540X
- Publication type
Article
- DOI
10.30956/0544-540X-42.2008.7