The bluegill x pumpkinseed cross is the most common hybrid sunfish found in Connecticut.

Information on hybrid sunfish in Connecticut.

Connecticut Fly Angler: Identifying CT's Sunfishes

Pumpkinseed × Bluegill (Hybrid Lepomis gibbosus × macrochirus

Small ponds support hybrid sunfish well

Lepomis - Wikipedia

Sunfish 101: How to ID a bluegill, pumpkinseed or redbreast

Connecticut Fly Angler: Identifying CT's Sunfishes

Sunfishes and Freshwater Basses

Greengill Hybrid Sunfish Identification

Connecticut Fly Angler: Identifying CT's Sunfishes