In 1987 the Coelacanth Conservation Council advocated the conservation of coelacanths. The African coelacanth genome provides insights into tetrapod evolution. Their descendants also included pelagic lobe-finned fish such as coelacanth species. The West Indian Ocean coelacanth is a critically endangered species. The Indonesian coelacanth and the mimic octopus are present in the waters off Sulawesi's coast. These islands support a large benthic fish population that help to sustain coelacanth populations. Approximately 80 species of coelacanth have been described, including the two extant species. The largest living lobe-finned fish is the coelacanth. Thousands of fish species occur, including the rare coelacanth. In December 1952 a specimen of the Coelacanth fish was re-discovered off the Comoros coast. Externally, several characteristics distinguish the coelacanth from other lobe-finned fish. The other species is the Indonesian coelacanth ("Latimeria menadoensis"). It was the seventh Indonesian coelacanth found in Indonesian waters since 1998. Electrophoresis testing of 14 coelacanth enzymes shows little genetic diversity between coelacanth populations.