Male or female

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Male or female

Postby mccar349 » Fri Mar 23, 2007 7:23 pm

Hey everybody, I've got an albino tiger and tiger Oscar. I was wondering how you can tell the sex of them. They are about 4 inches long right now.
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Postby sprout » Fri Mar 23, 2007 7:29 pm

There are no external sexual diamorphisms between male and female oscars. The only sure way for a non-expert to tell is to see one O lay the eggs and the other fertilize them. There is another method, called venting, but it is best left to an expert and even then reportedly not always accurate. And since I am guessing your next question might be 'How soon will they lay eggs?' I'll just add that an O is generally not sexually mature till it is a year old and or 8-10" long.
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Postby legendre » Fri Mar 23, 2007 9:53 pm

there is another way u can tell, if the anal fin (which is below the back fin is pointy it means its a boy if it is kind of curved it means its a girl,you cant really tell easy until they get to at least 4inchs
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Postby frankie2000 » Fri Mar 23, 2007 10:19 pm

Here is an article about your question from the article section.
http://www.oscarfish.com/cms_view_article.php?aid=4
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Postby frankie2000 » Fri Mar 23, 2007 11:08 pm

legendre wrote:there is another way u can tell, if the anal fin (which is below the back fin is pointy it means its a boy if it is kind of curved it means its a girl,you cant really tell easy until they get to at least 4inchs


This method that you have explained can work with other types of fish, but IMO this is not a reliable way to tell the difference between male/female for Oscars.
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75gal. Male JD & 6 Giant Danios
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Postby legendre » Sat Mar 24, 2007 2:39 am

thanks frankie i just wasent that shore,well thats what i was told from my LFS wen i first got my oscars
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Postby ChileRelleno » Sat Mar 24, 2007 2:45 am

legendre wrote:there is another way u can tell, if the anal fin (which is below the back fin is pointy it means its a boy if it is kind of curved it means its a girl,you cant really tell easy until they get to at least 4inchs
:bs:

Sorry there is no way to tell for 'certain' until you see a pair successfully breed.
There is no external sexual dimorphism.
Fin or fish body shape/size, coloring/markings, aggression and whatever else people tell you are ways to sex O's are total crud!
Venting is a method used by some but is considered by others to be unreliable, very experienced keepers/breeders may have better chance at successfully venting.
Venting, the examination of the OO & Oo shape of a fishes vents, you need alot of practice and it helps to have fish already positively sexed, of relatively the same age and size to compare to... Even then...

Venting O's and it's reliability is highly controversial.

The only sure way is to see two O's successfully breed, and at that time you can take note of the shape of the vents as they are displayed, when mating the genitals protrude from the fish.
The females genitalia is more rounded and the males more pointed.
Sometimes the 'supposed act of breeding' can be confusing since two females can put on quite a show together complete with eggs.

Read this article, http://www.oscarfish.com/cms_view_article.php?aid=4

Pics of male/female Oscar's vents, it just looks easy
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Postby mccar349 » Sat Mar 24, 2007 2:30 pm

Thank you very much that was all great advice. I am really anxious to see if I have a male and a female.
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