Apeltes quadracus, the Fourspine stickleback or Bloody stickleback is a species of stickleback which lives in freshwater, brackish and benthopelagic environments of the northwestern Atlantic Ocean between Newfoundland and South Carolina.

Apeltes quadracus, the Fourspine stickleback or Bloody stickleback is a species of stickleback which lives in freshwater, brackish and benthopelagic environments of the northwestern Atlantic Ocean between Newfoundland and South Carolina.