There are some people in Hawaii who think that Tilapia end up doing more damage in reservoirs because there is no die-off and no harvesting.

In these reservoirs, the tilapia completely denude the water of any vegetation.

I have no experience either way with tilapia, but I did fish a reservoir on Kauai that was overrun with tilapia and had no vegetation whatsoever.


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."