Mimicry by young Erythrinus erythrinusīy chance, researchers have discovered that in French Guiana some of the young Erythrinus erythrinus have a very special hunting method. They do this when they become trapped in drying parts during the dry season. It also allows them to move small chunks over land. The swim bladder then removes the oxygen from the air. This allows them to gasp for air above the water. To survive in the almost stagnant waters with little oxygen, the Red Wolf Fish has an adapted swim bladder. The females probably have a slightly rounder belly than the males. The difference between the males and females is very difficult to see. It is possible that further research will reveal that it actually concerns a whole complex of species instead of a single species. Young specimens sometimes show some orange or yellow accents, these become brighter as the fish gets older. A dark stripe can often be seen along the lateral line that extends from behind the eye to the caudal fin. The markings and colours depend on the location where they were caught. At the front of the head is a large mouth with teeth with which it can catch its prey. They can reach a length of about 22 centimetres, but in the aquarium, they sometimes become a little longer, up to about 25 centimetres. They calmly wait for their prey to swim past and then strike. They are therefore not very active hunters. DescriptionĮrythrinus erythrinus is an elongated-shaped predator. Synonyms: Synodus erythrinus, Erythrinus salmoneus, Erythrinus brevicauda, Erythrinus longipinnis. They are sometimes sold in stores as Hoplerythrinus unitaeniatus. You will not encounter the Erythrinus kessleri at all in the aquarium hobby. However, because they have not been bred in captivity, they are very rarely offered. The Red Wolf Fish has been kept in the aquarium hobby since 1910. The genus Erythrinus consists of only two officially described species, Erythrinus erythrinus and Erytrhinus kessleri. The family Erythrinidae or Wolffish includes only 3 genera. The name erythrinus is derived from ancient Greek and means “red”. Erythrinus erythrinus was described as early as 1801 by Bloch and Schneider.
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