Offshore Depth Distribution of Round Gobies
 Southern Lake Huron - Fall 1999
USGS
•What adds to the concerns is data provided by USGS fall forage trawling offshore in 1999
•Most abundant at 37 m and found in abundance all the way out to 73 m
•This presents concerns for lake trout and other LH species that spawn offshore
•Overall more concerned with goby trends and potential impacts to fish communtiy
   - aggressive behavior, proliferation


Catch at depth of round gobies at three sites in southern Lake Huron (data from all sites were pooled)

Spread in distribution to deepwater areas in southern areas of lake
-up to 70 m depth but most abund at 37m;  small <100mm
-offshore waters warm in 99 (9-10C), could be depth/temp phenomenon
97=1, 98=3, 99=480 - only at southern lake sites (temp trends offshr in N?)