Fish Owner Tips: How to Tell the Sex of Your Fancy Guppy

Shannon Frye
There are two types of guppies. There are Fancy Guppies and there are feeder or wild guppies. The wild guppies will have spots of color on them. The males will have spots of color and the females will have no color. They will be purely silver in color. Fancy guppies will always have some color. Fancy guppies can come in different colors such as green, red, blue, orange, fluorescent, black and many other colors. Fancy guppies are often the most common type of guppy found in the pet store. Wild guppies are meant to be feeder fish.

When it comes to telling the different between male and female guppies, it's very simple. The more you work with telling the fish apart, the better you will become at telling them apart from one another. The female guppies will often times grow to be larger than the male guppies. You only want to have about 3 females to every male guppy. Knowing the sex of your guppies will help out your breeding issues and death issues as well. Too many male guppies in a fish tank will kill your female population.

The male guppies will be the most colorful. They will have color on their tail as well as their body and their top fin as well. Females will never have color on their top fin or their bodies. They will only have color on their tails. You will never see a male that doesn't have color on his body. If your fish is full grown and the fishes top fin has color, your fish is a male. If your fish has color on it's body, it's a male. If your fish only have color on the back fin, your fish is a female. It's very easy to differentiate the males from the females once you get used to it.

The baby guppies are the hardest to figure out. Most of the time, they will not develop color until at least 3 months after they are born. Even then, the guppy might look like a female but it could be a male. Recently I though I had a female guppy change into a male guppy but it hadn't developed all of it's color yet. It will take a good 6 months to know whether the fish is a male or a female unless you feed the guppies a lot of food to help them grow faster.

Published by Shannon Frye

I am a stay at home mom. I have a 2 year old daughter.  View profile

4 Comments

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  • Violet5/20/2012

    I can't tell I think I might of picked 2 boys...

  • Tong Vang10/19/2011

    Yes its not all about color. Maybe you just haven't seen any female guppies with color on their top fin. The only way to determine the sex of guppies is by looking at their bottom fin. Male guppies don't have the bottom fin, whereas females do. All guppies start as females, the hormones levels in the water determine which fish become males. If a fish becomes a male, their bottom fin changes into a male part called the gonopodium. Thus this is the only way to visually determine the sex of guppies.

  • Sue3/18/2011

    It'snot all about color!

  • Anonymous2/23/2009

    i have about 10 baby guppies i have look evey where to find the sex,before 6 weeks
    somebody help

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