How do you sex tropical oscar fish?

1. Look at the dorsal fin. The dorsal fin of a male oscar is longer and more pointed than the dorsal fin of a female.

2. Look at the anal fin. The anal fin of a male oscar is longer and wider than the anal fin of a female.

3. Feel the belly. The belly of a male oscar is thicker than the belly of a female.

4. Observe the behavior. Male oscars are more aggressive than female oscars. They will often chase and harass females.

It is important to note that these are just guidelines and there is some variation within the species. If you are still not sure whether your oscar is male or female, you can take it to a professional fish store or breeder.