Ostorhinchus parvulusOstorhinchus parvulus, also known as the redspot cardinalfish, is a marine fish in the family Apogonidae.DescriptionRedspot cardinalfish are semi-transparent with a large pink caudal spot. They reach a maximum size of.Distribution and habitatThe redspot cardinalfish can be found in groups around current-prone rocky reefs, up to a depth of.ReproductionRedspot cardinalfish are mouthbreeders that form distinct spawning pairs.