I have a fish which is 7.5 centimetres long, which just so happens to be the perfect limit size for the tank, I saw an article saying that they would only grow to the size of the container, and if I moved it to a different container then it would grow to fit that size as well, but didn’t explain further than that, why and how does this work?
In: Biology
This is a complete myth. Fish do not “magically” grow to the size of their container. What’s usually happening is that the fish is being stunted because the conditions it lives in are harmful.
They are also dying prematurely (i.e. in a matter of weeks/months instead of 10-15 years for a goldfish [https://www.google.com/search?q=goldfish+lifespand&rlz=1C1CHBF_enCA855CA855&oq=goldfish+lifespand&aqs=chrome..69i57j0l7.4221j0j1&sourceid=chrome&ie=UTF-8](https://www.google.com/search?q=goldfish+lifespand&rlz=1C1CHBF_enCA855CA855&oq=goldfish+lifespand&aqs=chrome..69i57j0l7.4221j0j1&sourceid=chrome&ie=UTF-8) )
You could replicate this by putting a human in a small box and noticing that they never outgrow it (i.e. they will be stunted and die young)
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