Fish kills and food for thought

[FishermanTim]

Here's my $.02 worth.
I used to live in Arlington, MA a few bloacks from Spy Pond.
It's an oval shaped pond, divided in half by a small island.
I used to fish there regularly, and saw what waterfront development can and does do to aquatic environments.
When I first began fishing there, both sides of the pond were similar in amounts of vegetation and fish population. after five years of fertilizer runoff and the ever-popular canadian goose turds, the heavily used/treated half of the pond was almost completely destroyed. No plants, No fish, and of course, plenty of geese. Although the geese weren't the initial problem, they were enticed to come and stay and became part of it.
Luckily, the remaining half of the pond had remained relatively clean, but for how much longer?
Sorry for the length, but if this can happen in short order in a closed waterway, it can MOST definitely happen in coastal waterways.