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Author Topic: Do Goldfish grow to the size of their containers?
slycat
The Red and the Green Stamps


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It has always been common knowledge that a goldfish will grow to fit the size of their containers. If you keep one in a bowl, then it won't grow more than a couple of inches, but put the same goldfish in the lake, and it will grow to be over a foot long. Is this really true? I have seen carp over a foot long, but how can a fish control its growth?
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Ursa Major
The Red and the Green Stamps


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Goldfish, carp and koi release hormones into the water and their growth is regulated by how high a concentration of those hormones they are able to detect. If you want to watch a goldfish outgrow its container simply change the water twice a day.
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Warlok
Little Sales Drummer Boy


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Is that a recipe for "Bonsai Goldfish" [Big Grin]

Warlok

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Inconceivable

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slycat
The Red and the Green Stamps


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That is too funny. Thanks for the info.
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Dr. Van Thorp
Deck the Malls


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In either Charley and the Chocolate factory or Great Glass Elevator, Willy Wonka has goldfish that have been tricked into growing into the block shape of the inside of their tanks. Willy accomplished this by placing underwater photos of large lakes around the tanks.
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MamaBird
We Three Blings


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I know this one's true! Not a friend of a friend, but my own mother got tired of her two pet goldfish when she was a youngster, and solved the problem by "setting them free" in the horse tank on her sister's farm. They did indeed grow to be more than a foot long. Their descendents were still thriving in the tank when I visited that farm more than 30 years later.

MamaBoid

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It takes a sexually stimulated man to make a chicken affectionate.

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Gold Toes
The Red and the Green Stamps


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This is a common misconception.

No, a goldfish cannot grow to its full size in a fishbowl. However, the internal organs keep trying to grow, and what ends up happening is that the fish experience organ failure and die after (at most) a couple of years.

When properly kept (at least 20 gallon tank for one or two, add 10 gallons for each additional goldie) a common feeder goldfish will reach up to 8" and live anywhere from 15-20 years.

Keeping them in bowls is really one of the more horrific things you can do to an animal.

http://www.aquaticcritter.com/Freshwater/Goldfish_secondclass_citizens.htm

What was mentioned about the growth hormones in the water telling the fish when to "shut off" growth is partially true, but the internal organs of the fish will keep expanding until they become deformed as the fish's body can't get any bigger (referred to as "stunting")

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jgriffith
The Red and the Green Stamps


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I can only confirm that which I have experienced. I've got a regular carnival style goldfish that was added to a 75 gallon freshwater tank along with a few other large fish, and years later it's a good 7" long at the least. Seems to be moderately healthy and likes to interact with people, not unlike the dog-like behavior of domestic koi. you put your hand in the water and he'll let you pet him.

jason

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resELution
Markdown, the Herald Angels Sing


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quote:
Originally posted by jgriffith:
I can only confirm that which I have experienced. I've got a regular carnival style goldfish that was added to a 75 gallon freshwater tank along with a few other large fish, and years later it's a good 7" long at the least. Seems to be moderately healthy and likes to interact with people, not unlike the dog-like behavior of domestic koi. you put your hand in the water and he'll let you pet him.

jason

*girlish squeal*

I love it when fish let you pet them. Ihad some goldfish taht died after a couple years, and now I'm thinking I won't get more unless I can have a big pond for them.

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fledibat
Deck the Malls


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quote:
Originally posted by Gold Toes:
This is a common misconception.

No, a goldfish cannot grow to its full size in a fishbowl. However, the internal organs keep trying to grow, and what ends up happening is that the fish experience organ failure and die after (at most) a couple of years.

Oh dear. I feel like an awful person now. I have, through my ignorance, caused needless suffering for at least 10 goldfish. Although, I did have a betta in college. Less than aweek after getting Mister Fishy, he got moved from that nasty cup to a 5-gallon aquarium. Probably still smaller than he needed, but a hell of a lot better than that cup he could barely turn around in.
He ate out of my hand and let me pet him. I miss him.

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Chelle
The Red and the Green Stamps


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quote:
Originally posted by fledibat:
Less than aweek after getting Mister Fishy, he got moved from that nasty cup to a 5-gallon aquarium. Probably still smaller than he needed, but a hell of a lot better than that cup he could barely turn around in.

Lol. I currently have a beta named Mr. Fish. [Big Grin] And BTW, a 5 gallon aquarium is fine for a beta.

-Chelle

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abby 68
Happy Xmas (Warranty Is Over)


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quote:
Originally posted by Gold Toes:
This is a common misconception.

No, a goldfish cannot grow to its full size in a fishbowl. However, the internal organs keep trying to grow, and what ends up happening is that the fish experience organ failure and die after (at most) a couple of years.

When properly kept (at least 20 gallon tank for one or two, add 10 gallons for each additional goldie) a common feeder goldfish will reach up to 8" and live anywhere from 15-20 years.

Keeping them in bowls is really one of the more horrific things you can do to an animal.

http://www.aquaticcritter.com/Freshwater/Goldfish_secondclass_citizens.htm

What was mentioned about the growth hormones in the water telling the fish when to "shut off" growth is partially true, but the internal organs of the fish will keep expanding until they become deformed as the fish's body can't get any bigger (referred to as "stunting")

This I never knew [Frown]

But any goldfish I have in the future will be going into oversized tanks [Big Grin]

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Gold Toes
The Red and the Green Stamps


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quote:
Originally posted by keeta:
This I never knew [Frown]

It's unfortunate... but petstores are out to sell things. Goldfish are easily replaceable, as are bettas, so they often get sold with horribly inaccurate care instructions.
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