Great shot of the bridge piling...
I'm thinkin the image below may be a school of fish...by being able to pick out individual echoes in that wad...
The image below looks like brush with mixed in baitfish...
The image below...too much red for baitfish in the 2d ...this one needs rescanning from several directions...
The image below...circled in red is probably a school of fish or baitfish...(did you notice the defined thermocline in this pic..??)
The image below...this is a known software issue with the DI Enhance Sharpness setting...turn Sharpness Off...