02-22-2008, 08:11 PM
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Sorry Lupin I must disagree here. There are ways to sex angels prespawn. There are a couple of draw backs. One, the fish needs to be about the size of a half dollar, at least for me to get it right. It doesn't work on juvenile, quarter sized fish. There are some angel breeders who can get it right at much smaller sizes than I. I actually kinda suck at it.
The method seems rather simple. I have a friend who uses a method that I have found to be very accurate, somewhere in the 95%+ range, he admits. Using the ventral fin as a guide, the angle of the body from the peduncal to the trailing edge of the ventral fin is rounder in the female. There will also be a flat area at the location of ovipositor, whether extended or not. Now, I'm not real good at this method. I don't breed alot of angels, so I don't notice all of the subtle differences between the sexes.
I am sure that there would be exceptions to this rule just like there are exceptions to the "eggspot" theory" in some mbuna. But, those that use this method, seem to swear by it. It does have its drawback in that the fish must be larger, at least for me to get any accuracy. My friend laughs at me when I practice in his fish room. I usually get about 60-70% correct, sometimes. This is a small difference and in some specie variations it is very hard to get correct. But, my friend gave me (10) 50-cent sized angels, picking out (5)pair and I now have (5)pair. Pretty good average, if you ask me. That's how I found out about this method. I'm just not good at it.