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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. [2] In tropical South America, where the species naturally resides, A. ocellatus specimens are often found for sale as a food fish in the local markets.
The individual growth model, published by von Bertalanffy in 1934, can be used to model the rate at which fish grow. It exists in a number of versions, but in its simplest form it is expressed as a differential equation of length ( L ) over time ( t ): L ′ ( t ) = r B ( L ∞ − L ( t ) ) {\displaystyle L'(t)=r_{B}\left(L_{\infty }-L(t ...
Keeping and Breeding Halfbeaks - includes growth rate chart and pictures of newborn fish. Viviparous - the UK's larges online club with forums and photo albums; Loaches. International Loach Association Loach care and discussion; Loaches Online - Loaches in aquaria; Pufferfishes. Pufferpedia Archived 2009-05-23 at the Wayback Machine Pufferfish ...
Aristotle (ca. 340 B.C.) may have been the first scientist to speculate on the use of hard parts of fishes to determine age, stating in Historica Animalium that “the age of a scaly fish may be told by the size and hardness of its scales.” [4] However, it was not until the development of the microscope that more detailed studies were performed on the structure of scales. [5]
Oscar: Astronotus ocellatus: 45 cm (18 in) Many people that purchase these fish do not realize that the fish could grow to a foot long (30 cm) within a year. Due to their fast growth rate and large size as an adult, they are often kept in aquariums that are too small for them. [45] 72-80 °F (22-27 °C) [45] 6.0-7.5 [45] Butterfly peacock bass
The lead asserts that Oscars are slow growing for aquarium fish, this is simply not accurate. Oscars grow at a rate approximately 1.5-3cm per month - around an inch - until they reach about about 20cm (8inch). Within the Cichlid family (the family the Oscar is in) there are hardly any varieties that match this rate of growth.
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Astronotus crassipinnis is a South American fish in the cichlid family from the southern Amazon basin and the Paraná–Paraguay basins. [1] It is not as well-known or common in the aquarium trade as its relative, the more northernly distributed oscar (A. ocellatus). [2] A. crassipinnis reaches up to 25 cm (10 in) in length. [1]