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Determining The Sex in Discus Fish

In juvenile fish, determining sex is spawning, and should be closely observed.
almost impossible. It is only when they It has been said that the male discus
begin to pair off that an opportunity fish will tend to have a less intense
arises to help in the determination of color and more pattern while the female
sex. Juvenile fish, both male and female, tends to be more colorful but with lesser
have a rounded dorsal fin, and it is not pattern. I disagree, because too many
until they begin to mature that a variables are in place here, such as the
difference can be detected. As it is health of the discus, the water
never wise to excessively handle the parameters, and feeding pattern.
fish, close observation is in order to In an interesting article by Jeff
aid the breeder. Richard, he discusses an article from
In Allnut Enterprises' King Discus Diskus Brief, a German publication, which
Hatchery, for example, it is an easy reports a very successful way of
process to determine who is who, as we determine sex of a discus by using simple
have observed these fish for a while, and geometry. Jeff reports, and I quote:
can determine the sex of the pairs we "Picture a discus facing to your
own. This would be true in any hatchery. left ... you would be looking at its
But to the uninitiated or casual side. Find the Dorsal (Top) and Anal
observer, this would not be easy to do. (bottom) fins and look where the fins
Some of the identifiers: The male will slope down toward the Caudal (tail) fin
have thicker lips to aid him in his fight ... make sure you're looking at the fins
to protect the female, and will be more after they have curved back toward the
aggressive. He will be larger than the tail. The Dorsal and Anal Fins become
female, his forehead is thicker, and we (almost) straight after the fins curve
have observed that if the discus are a down (or up) toward the Caudal Fin ...
bit shy, the male will have a tendency to extend an imaginary line along this
stay between the female and the observer. straight section of the 2 fins back
The dorsal fin of the male will be toward the tail which just touches the
pointed, and the female's dorsal fin will Dorsal & Anal Fins past the Caudal
be rounded. Note that in juvenile discus, Fin. These two imaginary lines should
this is not apparent. intersect behind the fish. The key to
The breeding tube of the female, between sexing the fish is where the lines cross
the anus and anal fin, is broader and the Caudal fin. If they pass through the
rounder than the male, and will have a Caudal Fin, the fish is most likely a
blunt tip. The male, in turn, has a FEMALE. If they miss or just touch the
smaller, sharper breeding tube. Be aware Caudal Fin, then most likely it is a
that this is only evident during MALE." Thanks, Jeff!




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