Aggregations of common holothurians on reef flats of Coral Bay, Ningaloo Reef, North Western Australia

The distribution of three sea cucumbers (H. whitmaei (Bell 1887), H. atra (Jaeger 1933) and S. chloronotus (Brandt 1835) in the vincinity of Coral Bay, Ningaloo Reef, Western Australia was measured. There was an emphasis on factors that may contribute to the heterogeneous distribution of H. whitmaei within broadly defined habitats and reasons for variable density estimates reported in the literature.