Lake Sturgeon movement after trap and transfer around two dams on the Menominee River, Wisconsin-Michigan

Transactions of the American Fisheries Society
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Abstract

Fish behavior after passage or transfer around dams is a critical component in determining whether the goals of these efforts are achieved, but these behaviors are often poorly understood. An elevator was constructed in the lowermost hydroelectric dam on the Menominee River, Wisconsin–Michigan; it is the first elevator specifically designed to capture Lake Sturgeon Acipenser fulvescens for upstream transfer above two dams, providing access to high-quality spawning and early life habitat. Our objectives were to determine whether (1) Lake Sturgeon transferred upstream remained upstream for at least one spawning opportunity; (2) spawning opportunity, time to reach the next dam upstream, and residency in different segments of the river were related to sex, capture method (elevator versus electrofishing), and season of transfer; and (3) the probability of fish transitioning back downstream of the two dams varied among months. We evaluated posttransfer behaviors of 139 Lake Sturgeon that were captured in the elevator or by electrofishing, implanted with acoustic transmitters, transferred upstream (in spring or fall) from fall 2014 to spring 2017, and monitored until fall 2018 using 20–23 stationary acoustic receivers deployed throughout the river. Most Lake Sturgeon (91%) remained upstream for at least one spawning opportunity. The probability of remaining for one spawning opportunity was not related to sex, fish capture method, or season of transfer. Residency times within the two impoundments and time to reach the next dam upstream varied among individual fish. A multistate model indicated that monthly survival after upstream transfer was high and that Lake Sturgeon typically remained above both dams in late fall to early spring, with most downstream movements occurring in April and May. Our results indicate that Lake Sturgeon transferred upstream have the potential to contribute offspring that may help to bolster the Lake Sturgeon population in Lake Michigan, but additional research may help in determining whether these contributions occur.

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Publication type Article
Publication Subtype Journal Article
Title Lake Sturgeon movement after trap and transfer around two dams on the Menominee River, Wisconsin-Michigan
Series title Transactions of the American Fisheries Society
DOI 10.1002/tafs.10379
Volume 151
Issue 5
Publication Date August 29, 2022
Year Published 2022
Language English
Publisher American Fisheries Society
Contributing office(s) Coop Res Unit Leetown
Description 19 p.
First page 611
Last page 629
Country United States
State Michigan, Wisconsin
Other Geospatial Menominee River
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