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Higher frequencieslike 200 kHz or highercreate narrow sonar cones under your boat, perfect if youre in shallower water and want a higher-resolution image capable of picking up more details

But unlike larger river systems, a trophy isnt necessarily measured in inches

This is done to prevent the halibut (which sometimes are very large) from damaging or perhaps upsetting his canoe in their dying struggles. To find out exactly how the halibut took its hook, I visited the Pacific Environment Institute in West Vancouver, where fish are kept outdoors in large round tanks for a variety of studies, including the effects of pollution

Can be used for small or large aquarium fish