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5 Facts About Goldfish You Might Not Have Known

Rachel M.
by Rachel M.
Published:  September 11th, 2025

Goldfish are one of the most popular pets in the world, often admired for their bright colors and grace.


While many people see them as fairly simple creatures, there are a few things about goldfish that might just surprise you.  

Goldfish - image via Canva

Table of contents

1. Goldfish Have Good Memories

Contrary to the old myth that goldfish only have a three-second memory, research has shown that they can actually remember things for months.


They are capable of recognizing their owners, responding to feeding times, and even learning tricks such as swimming through mazes or pushing balls. Their cognitive abilities are far more advanced than most people realize.

2. Goldfish Can Grow Really Big

Many people assume goldfish will stay small forever. However, they’re actually capable of growing up to 12–14 inches (30–35 cm) in length when provided with proper space and nutrition.


The size of their tank or pond largely influences their growth, so giving them ample room is key to keeping them healthy.

Goldfish - image via Canva

3. They Can Live for Decades

While many goldfish live only a few years in typical home aquariums, they can live for 20 years or more with excellent care. Some goldfish have even been documented to live over 40 years!


This makes goldfish a long-term commitment and a true companion if given the right environment.

4. Goldfish Have a Unique Sense of Smell and Taste

Goldfish have taste buds not only in their mouths but also on their lips and even along the roof of their mouths. This allows them to detect flavors in the water and selectively choose what they eat.


They also use their sense of smell to identify food, navigate their environment, and even recognize other fish.

5. They Can See More Colors Than Humans

Goldfish have remarkable vision. They can see a broader spectrum of colors than humans, including ultraviolet light, which is invisible to us.


This ability helps them find food, detect predators, and communicate with other fish in ways that are completely hidden from human eyes.

Goldfish - image via Canva

Final Thoughts

Goldfish are much more than just colorful pets swimming in a bowl.


With their intelligence, longevity, and fascinating abilities, they’re truly remarkable creatures that deserve a little extra admiration.


Next time you watch a goldfish gracefully swimming around their tank, remember: there’s more happening beneath the surface than meets the eye.


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Rachel M.
Rachel M.

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