Watch the shallows near the shoreline on warm days in late spring for spawning fish. The males clear a round area for spawning on the bottom of the pond, near shore, and defend the territory.
The fish community, like the habitat in Grenadier Pond has undergone considerable change. Once open to Lake Ontario, the community no doubt reflected those that would enter into the marsh to feed and return to the lake for some or all of their life cycle (e.g. salmon, sturgeon, pike, suckers, minnows). With the connection to the lake gone, the species are locked into the pond, relying on it for all of their life cycle requirements. [Source: Gartner Lee report, 1995]
Historically, Grenadier Pond served as a nursery for fish that spend much of their life in Lake Ontario. There is no longer a direct connection to the lake.
Pumpkinseed is native to Ontario but historically not native to Grenadier Pond. See also Ohio DNR Factsheet.
Largemouth Bass eat mainly fish, frogs and crayfish, and generally live in shallow water most of the year; spawn in shallow water in later spring to mid-summer, preferring a well-protected area of sand, gravel and silt. See also DFO Factsheet.
Carp, an introduced species, does well in low oxygen conditions. See also RBG Factsheet.
Pike need soft sedges to spawn in. Seasonal fluctuations in water levels help to maintain this kind of habitat. More about Northern Pike.