Green sunfish in this system?
Yes. according to; https://www.toronto....pment-part2.pdf
The Green Sunfish is a recent arrival to Toronto. It was first discovered in the lower Humber River in 1993 and is slowly expanding its range farther upstream and into other streams.
Does anyone know if the fish just north of the reservoir is safe to eat?
Back in the early 90's we ate the carp on a semi-regular basis.