Economic Importance for Humans: Negative
Some stingrays, like Himantura chaophraya, wreak havoc with oyster farms and cultivated clam beds. They can crush large quantities of this favored prey, which can be costly for the owners of the beds. The most well known negative impact of stingrays is the excruciatingly painful sting they can inflict. Stingrays and river rays frequently bury themselves in the sand or mud in shallow water, which makes it probable that waders will step on them. If stepped on, a ray will thrust its tail forcefully upward into the victim. The serrated, barbed spine not only delivers venom, but also creates a deep wound often worsened by the thrashing of the ray. Fishermen in rivers and coastlines of many parts of the world fear the often large, abundant stingrays. Victims of stings generally recover, but fatalities have occurred. Reportedly, soaking the injured part of the body in hot water (about 50 degrees Celsius) for 30 to 90 minutes can alleviate pain from the venom.
Negative Impacts: injures humans (bites or stings, venomous ); crop pest