For your safety... Markham did a study of the fish in Swan lake park and concluded that the fish are unsafe for eating. There is a law in Markham that swimming, skating, fish consumption or feeding ducks will result in a $5000 fine. Fish for fun, catch and release let the fish grow bigger. These ponds are meant to filter pollutants to the bottom of the pond and release clean water back into the rivers in Markham and thus fish swim in and out. Do not eat carps, suckers or catfish because they bottom feed and accumulate these pollutants. Some can be see washing up dead on shoreline but they become fertilizer. If you want to harvest food fish, go to a clean lake instead, and follow the fish eating guide. Or buy fish from a supermarket. Foody mart, T andT, Loblaws, etc. Catfish and carps are worth $0.99-1.99 per lb. bass and walleye are $5.99-11.99 per lb. trout are $2.99-3.99 per lb, crappie may be 8.99-14.99 per lb. Buy clean wild or farmed fish, do not risk your health by eating dirty fish that are bioaccumulating pollutants to clean River water in storm water management ponds.