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