How To Determine The Sex of Discus Fish


One of the biggest question asked of the discus breeder is "how do I determine the sex of my fish?" There are very few easy identifiable identifiers in this process. Here, we will discuss the methods used by some of the top breeders.

In juvenile fish, determining sex is almost impossible. It is only when they begin to pair off that an opportunity arises to help in the determination of sex. Juvenile fish, both male and female, have a rounded dorsal fin, and it is not until they begin to mature that a difference can be detected. As it is never wise to excessively handle the fish, close observation is in order to aid the breeder.

In Allnut Enterprises' King Discus Hatchery, for example, it is an easy process to determine who is who, as we have observed these fish for a while, and can determine the sex of the pairs we own. This would be true in any hatchery. But to the uninitiated or casual observer, this would not be easy to do.

Some of the identifiers: The male will have thicker lips to aid him in his fight to protect the female, and will be more aggressive. He will be larger than the female, his forehead is thicker, and we have observed that if the discus are a bit shy, the male will have a tendency to stay between the female and the observer.

The dorsal fin of the male will be pointed, and the female's dorsal fin will be rounded. Note that in juvenile discus, this is not apparent.

The breeding tube of the female, between the anus and anal fin, is broader and rounder than the male, and will have a blunt tip. The male, in turn, has a smaller, sharper breeding tube. Be aware that this is only evident during spawning, and should be closely observed.

It has been said that the male discus fish will tend to have a less intense color and more pattern while the female tends to be more colorful but with lesser pattern. I disagree, because too many variables are in place here, such as the health of the discus, the water parameters, and feeding pattern.

In an interesting article by Jeff Richard, he discusses an article from Diskus Brief, a German publication, which reports a very successful way of determine sex of a discus by using simple geometry. Jeff reports, and I quote: "Picture a discus facing to your left ... you would be looking at its side. Find the Dorsal (Top) and Anal (bottom) fins and look where the fins slope down toward the Caudal (tail) fin ... make sure you're looking at the fins after they have curved back toward the tail. The Dorsal and Anal Fins become (almost) straight after the fins curve down (or up) toward the Caudal Fin ... extend an imaginary line along this straight section of the 2 fins back toward the tail which just touches the Dorsal & Anal Fins past the Caudal Fin. These two imaginary lines should intersect behind the fish. The key to sexing the fish is where the lines cross the Caudal fin. If they pass through the Caudal Fin, the fish is most likely a FEMALE. If they miss or just touch the Caudal Fin, then most likely it is a MALE." Thanks, Jeff!

Sexing Discus is difficult at best. The easiest way to do so is to raise a group of at least six to eight discus, and allow them to pair off when ready. It is a beautiful sight to see this happen, and makes the hobby well worthwhile.

Alden Smith is a published author, and has been marketing on the internet for 7 years. His website, King Discus, is an active gathering place for discus breeders and lovers of discus fish.

His wife Betsy is the administrator of All The Best Recipes a site rich in online recipes and cookbooks.







Related News



Pets Feeling the Tough Economy - KWCH

Pets Feeling the Tough Economy
KWCH, KS -13 hours ago
Caring for pets however, is getting tougher. Many Americans simply can't afford the costs. And area vets say they've noticed a change over the past few ...

Pampurr-ing pets, and owners - The Spokesman Review

The Spokesman Review

Pampurr-ing pets, and owners
The Spokesman Review, WA -5 hours ago
As an animal lover her entire life, Deeds is like many pet owners who consider their four-legged friends more than just companions – her two dogs and cats ...

Heartworm Disease Prevention Protects Pets, Wallets - MarketWatch

Heartworm Disease Prevention Protects Pets, Wallets
MarketWatch -21 hours ago
BATAVIA, Ill., Nov 19, 2008 /PRNewswire via COMTEX/ -- The American Heartworm Society strongly urges pet owners to continue year-round heartworm prevention ...

Holiday feasts are not for pets - Atlanta Journal Constitution

Holiday feasts are not for pets
Atlanta Journal Constitution,  USA -19 hours ago
You’ll see our warnings about feeding repeatedly because around this time of year, every year, we see pets brought in with very preventable illnesses caused ...

A Happy Pet for the Holidays: Natural Remedies to Treat Animals ... - MarketWatch

A Happy Pet for the Holidays: Natural Remedies to Treat Animals ...
MarketWatch -3 hours ago
NORTH ANDOVER, Mass., Nov 20, 2008 /PRNewswire via COMTEX/ -- Does your pet misbehave when you leave the house? Whether you're entertaining or traveling for ...

Tales from Paw Print City: Senior living options opt-in pets - Northwest Voice

Tales from Paw Print City: Senior living options opt-in pets
Northwest Voice, CA -14 hours ago
With the increasing integration of pets into the lives of people and ever-mounting evidence for the benefits of having pets in our lives, it makes sense ...

HOLIDAY SHOPPING GOES TO THE DOGS! - Seattle Post Intelligencer

HOLIDAY SHOPPING GOES TO THE DOGS!
Seattle Post Intelligencer -12 hours ago
It's all to benefit the Seattle Humane Society and there will be professional holiday-themed photos for pets and their owners, several pets available for ...
Pet Food Bank helps four-legged friends in needIssaquah Press
all 2 news articles


The healing power of pets - San Francisco Chronicle

San Francisco Chronicle

The healing power of pets
San Francisco Chronicle,  USA -19 hours ago
Over the years, a plethora of data has been collected on the larger role dogs and other pets play in the health of people all over the world. ...

For the love of pets - The Union of Grass Valley

For the love of pets
The Union of Grass Valley, CA -5 hours ago
One of the themes that speaks of the holiday season is pets: Santa’s reindeer, especially Rudolph; puppies under the tree; catnip presents for the kitten of ...

Officials offer amnesty for exotic pets Saturday - Daytona Beach News-Journal

Officials offer amnesty for exotic pets Saturday
Daytona Beach News-Journal, FL -6 hours ago
The Florida Fish and Wildlife Conservation Commission will conduct one of its "pet amnesty days" on Saturday at the Jacksonville Zoo. ...
FWC to hold Pet Amnesty Day at Jacksonville Zoo & GardensChipley Florida Online Newspaper - Foster Folly News
Jacksonville JournalFlorida Times-Union
all 3 news articles