![]() ocellatus in the wild are relatively sedentary catfish, including Bunocephalus, Rineloricaria, and Ochmacanthus species. ![]() The oscar is one of the most popular cichlids in the aquarium hobby. In the aquarium The oscar at the Särkänniemi Aquarium in Tampere, Finland ocellatus practices brood care, although the duration of brood care in the wild remains unknown. Smaller females lay around 300-500 eggs, while larger female oscars can lay about 2,500-3,000 eggs. In captivity, pairs are known to select and clean generally flattened horizontal or vertical surfaces on which to lay their eggs. ocellatus fish are biparental substrate spawners, though detailed information regarding their reproduction in the wild is scarce. Frequency and timing of spawning may be related to the occurrence of rain. The species reaches sexual maturity around one year of age, and continues to reproduce for 9–10 years. Reproduction Īlthough the species is widely regarded as sexually monomorphic, males have been suggested to grow more quickly, and in some naturally occurring strains, males are noted to possess dark blotches on the base of their dorsal fins. The species is limited in its distribution by its intolerance of cooler water temperatures, the lower lethal limit for the species is 12.9 ☌ (55.22 ☏). Feral populations also occur in China, northern Australia, and Florida, USA as a byproduct of the ornamental fish trade. In its natural environment, the species typically occurs in slow-moving white-water habitats, and has been observed sheltering under submerged branches. ocellatus is native to Brazil, Colombia, Ecuador, Guyana, French Guiana, Suriname, Peru, and Venezuela, and occurs in the Amazon River basin, along the Amazon, Içá, Negro, Solimões, and Ucayali River systems, and also in the Approuague and Oyapock River drainages. Distribution and habitat Two tiger oscarsĪ. Juvenile oscars have a different colouration from adults, and are striped with white and orange wavy bands and have spotted heads. The species is also able to rapidly alter its colouration, a trait which facilitates ritualised territorial and combat behaviours amongst conspecifics. ![]() These ocelli have been suggested to function to limit fin-nipping by piranha ( Serrasalmus spp.), which co-occur with A. The wild-caught forms of the species are typically darkly coloured with yellow-ringed spots or ocelli on the caudal peduncle and on the dorsal fin. ocellatus examples have been reported to grow to about 45 cm (18 in) in length and 1.6 kilograms (3.5 lb) in weight. Description Ocelli on dorsal fin and caudal peduncleĪ. 1831 watercolor of Astronotus ocellatus by Jacques Burkhardt. The species also has a number of junior synonyms: Acara compressus, Acara hyposticta, Astronotus ocellatus zebra, and Astronotus orbiculatus. The species was originally described by Louis Agassiz in 1831 as Lobotes ocellatus, as he mistakenly believed the species was marine later work assigned the species to the genus Astronotus. It is considered a popular aquarium fish in Europe and the U.S. The fish has been introduced to other areas, including India, China, Australia, and the United States. ocellatus specimens are often found for sale as a food fish in the local markets. In tropical South America, where the species naturally resides, A. ![]() The oscar ( Astronotus ocellatus) is a species of fish from the cichlid family known under a variety of common names, including tiger oscar, velvet cichlid, and marble cichlid. ![]()
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