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  • Care
  • Tanks
  • Ponds
  • Equipment
  • Food
  • Types
  • Facts
  • Health
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  • Biology

Biology and Behavior

Goldfish Anatomy: The Full Guide

2022-10-062022-10-04 by Lewis German
Diagram of Goldfish Internal Anatomy

Studying the anatomy of a goldfish may help you to better understand their behaviour and lifestyle. Why do they do the things they do, how do their bodies work and what are all the correct names for the different parts of a fish? We aim to answer these questions in this guide. History of the … Read more

Categories Biology and Behavior Leave a comment

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

2021-12-092021-01-16 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 18 Comments

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

2021-01-082019-12-01 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 Leave a comment

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

2021-11-042019-10-05 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 4 Comments

Do goldfish have tongues? The truth might surprise you!

2021-11-042019-09-05 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 1 Comment

How big do goldfish get? Some can be massive!

2022-02-252017-11-22 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 18 Comments

How to train your goldfish to do clever tricks!

2021-01-082017-11-13 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 1 Comment
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Fantail goldfish swimming to the right

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Latest Comments

  1. Mary W. on “My goldfish is a bully!” How to handle aggressive goldfish2023-09-21

    I have a goldfish who was being attacked in a pet store ~ he also had a bacterial infection on…

  2. Digital on Green Pond Water in Winter: What is it?2023-07-28

    All the sections are explained beautifully. Keep sharing such articles.

  3. Angela Mariano on Goldfish Care: An Introduction to Caring for Goldfish2023-07-27

    Hello! I have an filter in my tank, but I was just reading about an airstone… will that be good…

  4. Nancy on How often to feed goldfish: Get a healthy schedule now!2023-07-26

    One of my pond fish is getting bigger and bigger, in fact, he/she is huge. I put him/her in methylene…

  5. juraj on Goldfish Care: An Introduction to Caring for Goldfish2023-07-25

    i have one fantail gold fish it has 8 inches

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