FW stingrays of the family Potamotrygonidae are listed in the California Fish and Game Commission Regulations (14 California Code of Regulations 671) as "detrimental animals" (D). Species given the "D" designation are listed because "they pose a threat to native wildlife, the agriculture interests of the state or to public health or safety."Dr_Shakalu;1666770; said:Just like the title says, why are they illegal in California. I think freshwater rays are cool and wish I can get some. The Doctor.