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First off thanks for the report.
Second, the swim bladder is what creates the tell tale arch seen on a sonar. Ultrasound does not get a return from air so a fish mark shows as an arch due to fish shape and swim bladder. With this thought process you will still see a seven gill shark, it just won't appear as an arch. The same way we see structure on a finder.
Thanks again Aaron and Julie for the timeliness.
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