... whatever water is a refuge to trout is also a refuge for their food. If sufficiently concentrated I could see such fantastic growth resulting. The prey items would find the refuge in the same way that trout do ... they would follow the O2 gradient in the direction of increasing O2.
This sort of reasoning is genius. It happens in the sky, in the water and on land. If environmental pressure moves prey and predator closer together, its a free for all.
I'm not an expert on oxygenation, but I think jpsdad is spot-on here.
