Help with some images

Hey guys, I went out this afternoon and graphed some trying to put some quality time in to understand what it’s showing. I took some screenshots and if you guys could tell me what I’m looking at, it’d be of great help. I’m only focusing on the side imaging pics. Two were taken under a dock with the posts shown, question is, are the brights dots fish? 2 other images were taken running down a grass line with sparse lily pads. What are all the bright dots, fish? Thanks for all the help.

Pix 1 and 2 bright dots look like more dock posts due to faint shadows to the right of the white dots ...

Pic 3 looks like lots of fish ...

Pic 4 looks like a few random fish ...

Rickie