Normally, when I get stuff to show up that large it is likely a school of spots or whites. Mature gizzards might show up that large but these fish were quite a ways down and I think crappie would show up much smaller. At least the ones I have been seeing on Stockton show up smaller that those fish do.
This is a shot of some white bass that weighed 2-3#. They are 15' shallower than the other pic.