The pond is not typical in that it gets water via attachment to a large creek/small river. During high water events, silt comes in via the creek.

We've never dredged it, and that or aeration would be part of a plan to reinvigorate the pond, if we chose to do so.

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."