Yeah that pike was moving its pectoral and pelvic fins and creating a small sand storm around it, possible camouflage?
When it kicked off and the water cleared it actually created a small depression in the muck.
It was hard to judge the size but I think it would have been close to 30. I wish I had the camera going a did see some fair sized pike but missed recording them.
They had just passed by when I hit the button, and didn't return for another shot.