Robust cardinalfish
Encyclopedia
The robust cardinalfish, Epigonus robustus, is a deepwater cardinalfish
Deepwater cardinalfish
Deepwater cardinalfishes are perciform fishes in the family Epigonidae.They are small fishes: the largest species, Epigonus telescopes, reaches 75 cm in length, and most species grow to no more than 20 cm or so....

 of the family
Family (biology)
In biological classification, family is* a taxonomic rank. Other well-known ranks are life, domain, kingdom, phylum, class, order, genus, and species, with family fitting between order and genus. As for the other well-known ranks, there is the option of an immediately lower rank, indicated by the...

 Epigonidae, found around the world in southern temperate waters, at depths of between 500 and 3,000 m. Its length is up to 22 cm.

It is a vigorous fish which, apart from the second dorsal fin
Dorsal fin
A dorsal fin is a fin located on the backs of various unrelated marine and freshwater vertebrates, including most fishes, marine mammals , and the ichthyosaurs...

 exhibiting a longer spine, resembles the big-eyed cardinalfish
Big-eyed cardinalfish
The big-eyed cardinalfish, bigeye cardinalfish, or bigeye, Epigonus lenimen, is a deepwater cardinalfish of the genus Epigonus, found in southern temperate waters at depths of between 500 and 800 m...

.
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