Elk Lake lake trout

Jory Jonas, fisheries research biologist for the Michigan Department of Natural Resources, vents a lake trout. The lake trout's swim bladder is filled with air, making it tough for the fish to get back to the depths of the lake.
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( Morgan Sherburne/News-Review / October 31, 2012 )

Jory Jonas, fisheries research biologist for the Michigan Department of Natural Resources, vents a lake trout. The lake trout's swim bladder is filled with air, making it tough for the fish to get back to the depths of the lake.

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