Probably just an abundance of predator fish and a lack of bait fish, but this problem needs decisive action to turn it around.

Super aggressive culling is most likely the first and most major activity.

Unless you go way extreme with the addition of some 'sustainable' size of bait fish, it will not change the dynamic.

Electroshocking might one of the better ways to cull fish, as well as trapping and seining.

11 acres might be too large to kill everything off and start fresh.


Excerpt from Robert Crais' "The Monkey's Raincoat:"
"She took another microscopic bite of her sandwich, then pushed it away. Maybe she absorbed nutrients from her surroundings."