Identification
Look for a rounded snout above a small mouth and dark V-, U- or W-shaped markings along the sides. Breeding males become intensely green, sometimes obscuring the underlying pattern. The cheek, gill cover and belly are scaled. The upper lip is attached to the snout in a way that limits mouth projection.
Names and Size
Many references treat the central form as Etheostoma blennioides pholidotum. Canada’s species assessment explicitly identifies its greenside population as this form, allowing those regional observations to be used here. Canadian records average 76 millimeters total length, with most fish shorter than 110 millimeters. A larger maximum quoted for Greenside Darter as a whole has not been established specifically for the central form.
Habitat and Feeding
Riffles with rocks, current and attached vegetation offer feeding and breeding habitat. In Ontario’s Grand River, summer diets contained substantial numbers of mayflies and caddisflies, followed by midges and blackflies. The fish feeds along the bottom, including the upper surfaces of rocks, rather than behaving like a minnow cruising open water.
Spring Reproduction
Adhesive eggs are deposited on algae or aquatic moss. Males can defend spawning territories, which is different from directly tending an individual clutch. Northern breeding occurs later than in southern greenside populations; water conditions matter more than applying one calendar date across the range.
Green Can Hide the Pattern
Strong breeding color can conceal the usual side markings. A fish with fewer visible blotches is not necessarily a different species; compare the snout, fins and locality as well.
All Lakes With Central Greenside Darter
Browse lakes and reservoirs with documented Central Greenside Darter records, listed alphabetically. Records do not establish current abundance or public access. Check the evidence and managing authority for the water you choose.
No published lakes are currently linked to this species in our confirmed records.