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this video show how is effective to fish thermocline area especially in july. the downrigger was set at 65 feet deep , the laker srtike near 47 f ( 8.3 c) . the fish hawk td is the best tool for record temperature . this probe record temp infos each 5 feet until 300 feet deep max . my trolling speed vary 1.5 to 1.7 mph.on the sonar screen you can see trout hunting is prey (osmerus mordax) , at 65 feet the downrigger signal pass thru smelt school . lac des 31 milles, gracefield , quebec , canada .