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what is the different between and female and a male oscar fish2007-11-24 23:41:43Answers:

Oscars are very difficult to sex. Males may be slightly larger and the fins may be slightly elongated too but not by much. Experienced cichlid keepers look at the ventral openings and refer this as "venting". You are looking for differences in the actual openings. Females would have a larger opening to lay eggs. Males would not need such a big opening so it is smaller. Since Oscar eggs are very small it is not a very reliable way to tell the sexes apart. Bottom line -almost impossible.

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No well defined external differences are discernable for male and female oscars although males tend to be larger and more colorful. Breeding oscars defend their spawning sites, nest, and young quite fiercely. Male oscars may lock jaws in disputes over territory or mate selection. In captivity male and female have been observed to jointly prepare the breeding site. Eggs are adhesive and laid on a flat open surface cleared by the breeding pair. Hatching of eggs is temperature dependent, but typically occurs within 3 to 4 days. A single spawning may consist of as many as 1000 - 2000 eggs. Like most cichlids, oscars tend and guard their young. Non-native populations in South Florida are observed to spawn primarily during summer months.

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male is bigger

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Sexes are only distinguishable at spawning times when the female has a more obvious, rounded genital papilla.