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In page Oscar (fish):

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In captivity, pairs are known to select and clean generally flattened horizontal or vertical surfaces on which to lay their eggs.[citation needed]. Smaller females lay around 300–500 eggs, while larger female oscars can lay about 2,500-3,000 eggs.[4] Like most cichlids, A. ocellatus practices brood care, although the duration of brood care in the wild remains unknown.[2]