paradise fish


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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.
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, subphylum Vertebrata, class Actinopterygii, order Perciformes, family Osphronemidae.
References in periodicals archive ?
The results clearly show that the type of opponent (familiar versus nonfamiliar) has a major effect on the aggressive behavior of male paradise fish. In the case of familiar opponents (group A), three consecutive encounters were needed to induce significant changes in aggression.
In the case of the paradise fish, defeat decreases the probability of subsequent winning in an aggressive encounter, but prior winning has no influence (Francis, 1983).
At least in paradise fish, it seems that submissive fish try to use every occasion that offers the possibility of winning.
Paradise fish males defend territories and build bubblenests in shallow waters of rice-fields, where several males breed at the same time near each other (Forselius, 1957).
Our results support the hypothesis that aggressive experience in the paradise fish influences subsequent aggressive encounters by means of tv, o kinds of memory: one related to the outcome of the encounter ("status-related memory") and the other related to the opponent ("social recognition").
Behavioural elements of the paradise fish (Macropodus opercularis) I.