How Do You Know If Your Goldfish Is A Boy Or A Girl


If you’re a goldfish owner—or even just a fan of fish in general—there’s something you’ve probably wondered: how exactly do you tell if your goldfish is male or female? Well, wonder no longer! The answer is more complicated than it might seem at first, but we’ll get to that in a minute. Before we dive into the specifics of how to sex your goldfish, let’s go over some basics that will help make the process easier.

Juvenile goldfish are often hard to sex, but with a little help from your pet store, you can figure it out quickly.

If you don’t have a special tool to help, don’t worry! Your pet store should be able to tell you what you need to know. If not, they can also lend a hand.

You can also use a magnifying glass or even just take a really close look at their fins and tail.

Here’s what you need to know about identifying a male and female goldfish.

If you’re trying to figure out the sex of your goldfish, here’s what to look for:

  • Male goldfish have longer fins than females and also tend to be larger.
  • Males’ anal fins are pointed and thick, while females’ are rounded or even slightly split at the ends. The males also have a very noticeable hump that goes from just behind their heads all the way down their backs (it’s called a kype). Females don’t have this feature–their backs remain flat throughout their lives.

If these descriptions don’t make much sense yet, don’t worry! It may take some time getting used to identifying male and female fish by sight alone (for example, if you’ve never seen any other types of fish before). Just keep practicing until it becomes easier for you over time; eventually all those details will stick in your head so well that even when there aren’t any visual cues available anymore (like if someone takes away all but one fish), then too bad–you’ll still know exactly which gender it belongs too!

How Do You Tell If A Goldfish Is A Boy Or Girl?

You can easily tell the difference between male and female goldfish by looking at their bodies. Male goldfish have a short, wide body with small heads that are often covered in spots or patches of black or red color. The females tend to have long, thin bodies with large heads and no spots at all.

What Are The Signs Of A Male Or Female Goldfish?

  • Male goldfish have a longer and slimmer body, while females are rounder.
  • Males tend to have longer fins than their female counterparts. The tail fin in particular should be noticeably longer on males.

How do you tell if your goldfish is a male or female?

You can tell the gender of your goldfish by looking at their anal fin.

If you have a male, they will have a small bump on the tip of their anal fin as shown in the image below:

  • Source:


Now that you know how to tell if your goldfish is a boy or a girl, it’s time to get down to business. If you have more than one goldfish, here are some things to keep in mind:

  • If one fish is constantly harassing another fish, there’s probably something going on between them (in other words, maybe they’re dating).
  • You should never put two males together because they will fight and possibly kill each other (it’s best not to even think about trying this with females).

Now that you know how to tell if your goldfish is male or female, you can make sure they get the proper care they need. Remember that these fish are sensitive animals who need lots of attention and love from their owners!

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