ok, i went to yahoo & looked up pictures of mosquito larvae, & found enough to say thats them.

http://www.a-zpestcontrol.com/db_Mosquito_Larvae23.jpg
http://medent.usyd.edu.au/photos/various_larvae.jpg

on the 2nd link, specifically, theyre the ones on the bottom. creepy little buggers...but anyway, the donuts that you put in the pond to kill them off arent working, the fish arent eating them, any other ideas on how to get rid of them?