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see rayray,
extremely flat-bodied cartilaginous marine fish, related to the shark. The pectoral fins of most rays are developed into broad, flat, winglike appendages, attached all along the sides of the head; the animal swims by rippling movements of these wings.
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More specifically, the sensitivity of the electroreceptor system in the sandbar shark, the blacktip reef shark (Carcharhinus melanopterus, family Carcharhinidae), and the mangrove whipray (Himantura granulata, family Dasyatidae) are roughly equivalent (1 to 4 nV/cm; Haine et al., 2001; Kajiura and Holland, 2002).
Another elasmobrach in danger is the freshwater whipray (Himantura chaophraya), which grows to two metres across and can weigh 600 kilograms.
Other good redfish areas are the flats that run along and around the islands that make up the perimeter of Whipray Basin.