If you put in some finglerling fish in Fall '07, there is a good chance you have fish now, however, they would all still be pretty small (maybe less than 5"?).

Throwing out some fish food consistently for a few days, in the same spot would be a good way to see if you have anything.

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."