Foo, you're looking at some major efforts to get a course correction on your pond. You could potentially need to remove a thousand LMB or so to have a real impact as well facilitating other necessary avenues.

Massive fishing derbies and electroshocking would be good efforts.

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."