Thayeri and Dorserger

["Ed Pon" <edpon@hotmail.com>]

I've had a fair degree of succes at picking pairs (maile and female) of fish 
from  a tank.  A person who used to work in a LFS once told me how to sex 
Neolamprologus Leleupi.  He said you kind of look thme in the face and see 
which is more masculine-looking.  Actually, for fish that are difficult to 
sex, like discus, angels, Lake Tanganyikan Cichlids, and Curviceps, the 
males often have bigger heads.  If you look at the fish head-on, mature 
males may have broader foreheads. Looking at mature fish from the side, the 
height of the head just in front of the gill covers may be "taller" in the 
male fish.  Another factor to look at is the body proportions--males seem to 
have a greater length to height ratio than females.  These methods are 
somewhat subjective and work much better with older fish that are brought up 
under the same conditions so you know that feeding, age, and environmental 
differences did not contribute to the differences in the fish's appearance.  
If you take a look at pictures of breeding pairs of discus and other 
difficult to sex fish, you will probably see what I'm talking about.


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