Parapterois heterura, the blackfoot firefish, is a species of scorpionfish widely distributed on the southeastern coast of Africa as well as off Japan and in Indonesia where it is usually found in sheltered coastal bays with a soft bottom, such as fine sand or mud. It is found in depths ranging from. This species is a sedentary fish and may even bury itself within the substrate. P. heterura flashes its brightly colored pectoral fins to startlepredators and escape, but it may also use these fins to corner prey. This behavior has been demonstrated in other lionfish. This species can be found in the aquarium trade.
Description
Parapterois heterura grows to a maximum length of TL, however, most specimens are much smaller than this and adults are often about in length. The dorsal fin of this fish has thirteen spines with long filaments on their tips, and nine soft rays. The anal fins have two spines and seven to eight soft rays. The outer rays of the caudal fin also have filamentous extensions. Parapterois heterura is very similar in appearance to the closely related Parapterois macrura. The two species differ in that P. heterura has scales in a pit between the posterior nostrils while P. macrura does not. These species do not differ much in fin spine, fin ray, gill rakercounts, and most body proportions. Their differences lie in a small difference in head proportions. Also, in adults, the upper margin of the eye of P. heterura is below the base of the first dorsal fin spine, while it is above in P. macrura.
Distribution
This fish seems to have two separate ranges. One is on the coast of Natal in southeastern Africa and the other is in the central Indo-Pacific covering Japan, Indonesia, New Guinea and Australia.
Behavior
Parapterois heterura is largely nocturnal and may partially bury itself in the substrate during the day making it difficult to spot. The brightly colored pectoral fins are flared if the fish is disturbed and may startle predators but their main purpose seems to be to help corner prey when hunting. This fish feeds on small fish and bottom-dwelling invertebrates.
