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paradise fish,brilliantly colored freshwater Asian fish, Macropodus opercularis, often kept in aquariums. The males reach a length of 3 in. (7.6 cm) and turn reddish with blue bars during mating season. Fantastic varieties with greatly extended and modified fins and tails have been developed. The paradise fish is classified in the phylum ChordataChordata
, phylum of animals having a notochord, or dorsal stiffening rod, as the chief internal skeletal support at some stage of their development. Most chordates are vertebrates (animals with backbones), but the phylum also includes some small marine invertebrate animals.
..... Click the link for more information. , subphylum Vertebrata, class Actinopterygii, order Perciformes, family Osphronemidae.