I would say Yes to the Tuna Crab in the meter. In the past when the water is stuffed through the whole column, i have messed with my gain and found that the higher sensitivity settings pick them up all the way to the bottom, only when i turned it way down (50% or lower) did it eliminate the pesky little critters from the screen.
Theres always give and take with these meters....errr I mean fish finders!
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