black stingray digging in the sand to camouflage and hide away, tropical fish from the rivers of brazil

albimaculata and animal animals aquaculture aquarium araguaia away behavior bigtooth black blotched blotches bottom brazil brazilian camouflage camouflaged camouflaging digging dot exotic fish fishes from henlei hide hiding ichthyology leopoldi life marine myliobatiformes pet pets polka polkadot potamotrygon potamotrygonidae ray rays river rivers sand stingray stingrays tocantins tropical water white whiteblotched xingu yellow