Spinachia spinachia

Spinachia spinachia, the sea stickleback, also known as fifteen-spined or fifteenspine stickleback, is a species of stickleback which lives in benthopelagic and in brackish environments of the northeastern Atlantic Ocean. This species, the largest of the sticklebacks, grows to a length of 22 centimetres (8.7 in) SL. This species is the only known member of its genus Spinachia. It is of no interest as a commercial fish.