 The shock produced by the onefin electric ray can be painful , but is not substantially dangerous to humans . Though not utilized economically , this ray is frequently caught as bycatch in bottom trawls in South African waters . Because of its inshore habits , it may also be negatively affected by water pollution from coastal development . The International Union for Conservation of Nature ( IUCN ) has listed this species as Data Deficient due to lack of specific data , while noting that its vulnerability to fishing and habitat degradation may merit concern . 
