06/17/2026
Wildlife Wednesday — a lesson in regional ichthyology.
The Atlantic stingray (Hypanus sabina)
is a primitive looking species of the St. Johns River, it’s tributaries and springs. They represent the only permanent year-round fresh water population of an elasmobranch (sharks and rays) in North America. Both are cartilaginous fish — skeletons are made of flexible cartilage instead of bones.
St. Johns River stingrays typically grow around 10 to 13 inches across and up to 30” long with their barbed tail. Stingrays do not attack people, however if stepped on, they will use their spine as a form of defense. Although being pierced by the stingray’s spine is painful, it is rarely life threatening to humans.
Like all stingrays, they possess venomous, serrated barbs on their tails used for defense. If you are wading through the springs or river shallow areas, it is recommended to do the "stingray shuffle" to gently kick them away and prevent accidental stinging.
Prey typically consists of benthic (bottom-dwelling) invertebrates such as bivalves, tube anemones, amphipods, crustaceans, clams, and worms. Atlantic stingrays are highly electroreceptive fish. Like sharks, they have rows of sensory cells that able them to detect weak electric fields generated by prey creatures. The stingray can use this sense to locate prey buried in the sand. Scientists also believe male stingrays may use this sense to locate buried females during the mating season.
The world’s largest freshwater fish was discovered in June 2022. The massive stingray was caught in the Mekong River, Cambodia, and was measured a whopping 13-feet long and 661 pounds!