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Tuesday, January 26 • 10:00am - 10:20am
Biological Evaluation of The Milwaukee Harbor 'Green' Breakwall

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AUTHORS: Eric Geisthardt*, UW-Milwaukee; John Janssen, UW-Milwaukee; Burton Suedel, US Army Corps of Engineering

ABSTRACT: The Milwaukee Harbor “Green” Breakwall (MHGBW) is an artificial reef constructed by the US Army Corps of Engineers as a pilot program to create new rocky habitat in the Milwaukee harbor while repairing the aging breakwall. The MHGBW provides habitat and a rich forage source for a number of fish species and serves as a nursery habitat for juvenile fishes. The summer forage base on the breakwall is dominated by Hemimysis anomala which behave uniquely on the MHGBW. During the day Hemimysis forms swarms that saturate large rock caves formed by the armor stone along the breakwall, but we think many are hidden out of view in smaller cavities under smaller stones. At night we found numerous Hemimysis emerging from the interstitial spaces in the reef and swarming over the surface of the MHGBW. Preliminary diet analysis indicate that Hemimysis anomala are a primary forage for alewife and rockbass on the MHGBW, and an important constituent in the diets of YOY largemouth bass, juvenile rainbow trout, and brown trout.

Tuesday January 26, 2016 10:00am - 10:20am EST
Gerald Ford