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Answered 2011-09-13 04:59:03
I have kept and bred many Pairs of Oscars over the last 20 years and produced the only DVD solely about breeding Oscars in the world I can quite definitely say that there is no visual way of sexing Oscars other than when the ovipositors are extended when they are in breeding condition.
AnswerThis is a question I have seen countless times. Oscars are monomorphic, meaning that male and female look the same. If they look the same, how can you tell the difference between the sexes just by looking at them? You can't. Venting is the most successful way of sexing Oscars. I am afraid that the fin theory is incorrect. AnswerThis is a subject of much interest and much debate. Some say that the male Oscar will develop better colors, some say the female gets larger. The best way to sex Oscars is to put a group of young Oscars into a tank together and allow them to grow up. Hopefully a pair will establish. Other than that, it is very hard to tell the sex of Oscars. Answerthe females are mostly larger and bighter in color and the males has a organ behind the dorcile fin is your name tabatha rodgers by any chance cousin tanya rodgers dating Anthony row AnswerYou can tell if an Oscar is male/female by how long the anal fin is. If the anal fin is quiet long than it is a male. If it is short than it is probobly a female. This does not apply to veil tail Oscars though. AnswerActually, while the pointed anal fin is a good way to tell the sex of many other South and Central American Cichlids, it does not work with Oscars. Oscars, (like peacock bass, angelfish and several other related species), do not show external signs of sexual differentiation. Sometimes, an experienced breeder can give a educated guess by looking at a MATURE Oscar, but there is no definite way to tell unless they breed. You certainely cannot tell any Oscar until they are at least 1 year to 18 months old and at least 8 inches long. (or unless you disect them) AnswerI disagree with the statement above. you do not have to take an educated guess or wait till they breed. I have had my Oscar for 6 months/that is how old he is and I can tell that he is a male by his longer anal and dorsal fin. Everyone seems to think that it is hard to tell the sex of an Oscar but i of course disagree completely. Obviously the person above is not an experienced fish keeper and therfore should not answer questions they don't know for sure. Answerthe anal fin method is not always right. but it's better than nothing when you are at a pet shop trying to pick a breeding pair of Oscars Answerhttp://www.fishhead.com/articles/ventsex.htmThis link should help you. Copy and paste it in your browser.
Telling males from females is one of the most common problems a beginning cichlid hobbyist faces. For some species, males and females are readily distinguishable by color, size or shape. For others it is difficult or even impossible to tell the sexes apart in nonbreeding individuals. We call differences between the sexes "sexual dimorphism" and when there is no difference, we say they are "monomorphic". Oscars are the most monomorphic cichlids I know of, with no visual differences between males and females.
Probably the most accurate means for telling the sexes apart is a technique known as "venting", i.e. examining the vent region of a fish to determine its sex. For an excellent discussion and photographs on "venting", use the link above.
While "venting" is the only proven means of sexing Oscars without actually seeing their "ovipositors", it is not a procedure I would advise an inexperienced aquarist to attempt. It may also be worth considering that venting can only be reliable when carried out on mature fish. That means it will not work in the pet shop with fish under about 6 to 8 inches long.
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