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The Goldfish Tank
  • Gold Fish
    • Care
    • Types
    • Breeding
  • Equipment
    • Plants
    • Tanks
    • Ponds
    • Kit
  • Food
    • Goldfish Food
  • Facts
    • Polls
    • Fun
  • Health
    • Goldfish Care
    • Biology
    • Diseases

Goldfish Info

All good goldfish keepers take the time to learn about their pets. Knowing more about goldfish helps us to take better care of them.

Why not start by learning the 12 mistakes most new goldfish-keepers make?

You can also explore diseases, like swim bladder disease, and learn how to prevent them.

Plus, do you know the difference between goldfish and koi? Where goldfish come from? And whether or not they have tongues?!

Our Goldfish Facts & Info articles are where you can learn all of this and much more about your goldfish.

Male or female goldfish? How to tell (with pictures)

2025-06-012021-01-16 by Sara Jane Hales
A male goldfish with breeding spots on its fins

What are the physical differences between male and female goldfish? And how do they behave when spawning?

Categories Biology and Behavior Tags Male or female, Male or female goldfish 18 Comments

Are goldfish edible? Don’t even think about it!

2025-06-162020-12-13 by Sara Jane Hales
A cat looking at a goldfish

Technically goldfish are edible… but you wouldn’t want to go there!

Categories Facts Tags eat goldfish, edible goldfish 10 Comments

Do goldfish have brains? It’s NOT a stupid question!

2025-06-012019-12-01 by Adam Jones
Cartoon of a goldfish with a hole in its head

Not all animals have brains, but goldfish do.

Categories Biology and Behavior Tags Goldfish Anatomy, goldfish fact Leave a comment

Why do goldfish die? And how to keep them alive…

2025-06-012019-10-05 by Adam Jones
Cartoon of a dead goldfish lay on its back with its eyes closed

Understand why goldfish die and what you can do to stop it.

Categories Biology and Behavior Tags dead goldfish, goldfish behaviour 4 Comments

Do goldfish have tongues? The truth might surprise you!

2025-06-212019-09-05 by Adam Jones
Cartoon of a goldfish sticking its tongue out

Goldfish don’t have tongues. But they do have something similar.

Categories Biology and Behavior Tags Goldfish Anatomy, goldfish fact 2 Comments

How big do goldfish get? Some can be massive!

2025-06-162017-11-22 by Adam Jones
Cartoon of a goldfish squashed into a tank that is too small for it

The biggest goldfish ever was almost 19 inches long!

Categories Biology and Behavior Tags goldfish age, goldfish size 18 Comments

How to train your goldfish to do clever tricks!

2023-12-232017-11-13 by Adam Jones
Cartoon of two goldfish chasing each other

How to have your goldfish eating out of the palm of your hand!

Categories Biology and Behavior Tags goldfish training, schooling goldfish 1 Comment
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Fantail goldfish swimming to the right

Goldfish Care

Cartoon man feeding goldfish in tank

Goldfish Food

Latest Comments

  1. Trish Schultz on Can Axolotls Live with Goldfish?2023-11-16

    Thank you very much for your very helpful article. I have been working in an aquarium shop part time and…

  2. Marie Rabago on Can Goldfish Eat Cat Food2023-11-13

    Goldfish can eat cat food occasionally, but it's not an ideal staple diet due to its high meat content, potential…

  3. Mike Frye-Henderson on Pearlscale Goldfish; Care Guide, Lifespan, and More2023-11-11

    Hello, we have a 10 year old pearlscale that's sick. It's not able to get off the bottom of the…

  4. GW on Black Moor Goldfish; Care Guide, Lifespan, and More2023-11-10

    My Blackmoor goldfish is 5 years old and has been living in a rescue centre while I was in hospital.…

  5. Star on The Different Types of Goldfish Ponds2023-11-09

    The spelling you’re looking for is Aerate! Your pond sounds awesome!

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