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 the paradise fish, defeat decreases the probability of subsequent winning in an aggressive encounter, but prior winning has no influence (Francis, 1983).
Because opponents were always of the same social class in both groups (submissive or dominant), the recognition might have occurred on a different level, which suggests that paradise fish are capable of categorization within dominants or submissives.
At least in paradise fish, it seems that submissive fish try to use every occasion that offers the possibility of winning.
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.