The pathfinding in a house I made leads the fish to either not move or try to get to a nearby river(I think)

the bottom picture the fish have not moved outside of one block, and the top three show the fish all in a corner, and where the room is in relation to the only other water body.

Edit:

just to clarify for anyone reading this in the future, we have deduced that dolphins prefer natural large water bodies (I.e. the ocean) to the water bodies they spawn in, which is part of the issue I found.