blackteles

How Fast Do Goldfish Grow?

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Here's a really good article on the growth of goldfish written by Jamie Boyle. Great reading for everyone! ;)

Many aquarium owners having goldfish often wonder how big and how fast there goldfish will grow.

Goldfish growth really depends on certain factors that will influence how fast they grow. Some factors that directly influence growth are:

1. How clean is the water for your Goldfish?

2. How big is the environment, goldfish bowl, aquarium or pond?

3. What kind of food are you feeding your fish?

4. The genetics (DNA) of the goldfish parents passed on to their offspring.

How fast do goldfish grow is really a tough question to answer really. As mentioned above these factors will influence the growth potential of your goldfish. For example how clean your water is impacts how fast they will grow. If the water is too clear then lacks algae and food to feed on. Second if water quality is not kept up with proper maintenance causes stress on them which may impact the goldfish desire to eat. If they don't eat, they don't grow, therefore growing slower then normal.

The environment or home for your goldfish plays a big part on how fast goldfish will grow as well. For instance if you put your fish in a bowl it won't grow as much as it would if it were in an aquarium or garden pond. The environment plays a major part in goldfish growth. Goldfish will only grow to the size of their environment in which it can handle. Also the more space a goldfish has will help increase the size of your goldfish and won't stunt them from growing. When goldfish have big aquariums or tanks to grow in it will make less maintenance for you and much happier fish. Another reason goldfish grow faster in larger environments is there is more food readily available to eat. There is always food in an aquarium to eat for goldfish especially in ponds. Fish will grow fast due to abundance of algae to eat and also the live microscopic animals and insects to feed on. Goldfish basically have a buffet at anytime they want with the amount of food they will find to eat living in ponds. They will grow extremely fast as well if the water is green like pea soup or they are grown in mud ponds. You will see your goldfish grow fast.

The goldfish food that you feed them plays a part in their growth as well. If you want your goldfish to grow fast consider feeding them a wide variety of foods. Also high growth food will help as well maximizing the growth of your fish. You can also feed them several times a day just make sure they eat all the goldfish food that you give them within 2 minutes other then that discard uneaten food as it will foul your water. The food you feed them will play a part in their growth as well.

So to really answer the question, "How Fast Do Goldfish Grow" really has too many factors to really answer. Also genetics plays a part in this as well. If you look at some people today some are skinny, some are large, medium, petite, tall and short. Everyone grows differently and the same goes for goldfish. For example I'm 6'4" while my parents are like 5'6" so I grew taller. Usually if you come from a tall family you will have tall kids which happens most times through DNA passed on to kids. So goldfish genetics and DNA sometimes will impact how fast goldfish grow as well. Really a question with no true answer but definitely things people can do to grow them faster by doing several things. Biggest thing that will help grow your goldfish fast is give them the space they deserve don't confine your fish to small tanks go bigger and you will have bigger goldfish too.

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I'm curious to see the potential growth in my fish; they all live in perfect conditions, but I wonder about the quality and condition of goldfish available in rural Manitoba, where I've yet to find a store with large goldie stock (either numbers or size, lol) and I've yet to meet a fishkeeper, responsible or not, who's had a fancy larger than 6 inches with tail or a single tail larger than 9 inches :idont Most stores I've spoken to get their goldies from distributors who order bulk amounts from China; they're given a list of what's available and can't order anything specific beyond that.

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My Helo has gone from 3.5 inches, to nearly 7 inches in about a year. So fast, in some cases. :D

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Thanks for the information! This post is definitely a keeper :).

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My Helo has gone from 3.5 inches, to nearly 7 inches in about a year. So fast, in some cases. :D

How big is your tank?

-James

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Has any one ever seen a chart of chronological photos that show the growth of a fish throughout its life? I think that would be interesting to see.

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Thanks for the article. It was very informative.

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Hi! I have had my Ryukin for 3 yrs. He was the size of my thumb joint when I got him (had just changed color) and is now 12" long nose to tail. He lives in a sparsely populated 85g (Custom tank - 18"x18"x60") and eats bloodworms, cucumbers, lettuce, squash, peas and Hikari. SO, they can grow REALLY fast in the right conditions.

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WOW, rwolfe! I'd love to see pictures of your Ryukin! They're my favourite breed, and I've just bought one myself who's only wee at the moment. :heart

Also, fantastic article blackteles! :) I've been wondering this for a while. I've got a Fantail, a Ryukin and a Black Moor (2.5 inches, 2 inches and 1.5 inches, respectively) in a 120 litre tank until they get to around 4 inches each, then I'm moving them to a 450 litre tank I'm close to being able to afford. |D I can't wait to watch my babies grow up!

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Thanks for the info Dennis as always :)

I myself have been wondering about this as my little moor Jet has not really grown much since I got him and jazz has doubled in size same food and same conditions...

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Thanks for this article! My 2 oranda I just got in April have changed a lot! My girl has gotten twice the size of the male in the same time period and she was only maybe 10% or so larger tahn he was to start. She ahs gone from about a 2" body to almost a 4" body in about 6 months. Also I agree with rwolfe on a variety of food. My oranda Love their goodies.....

Thanks again Black ops... Cheers goldielocks :thumb:

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Thanks for the post, that is really informative.

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You have to keep your fish in a big aquarium and have the water parameters measured. Also don't introduce new fish as most of the fish in the pet shops have parasites and other diseases that will make your fish sick. changing a fishes environment from aquarium to bowl will make the fish stressed and can make it sick. Also use a multiple range of different foods. It took me a year but now i know a lot about goldfish.

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Thanks for the post I got one moor and one telescope almost a month and half ago. And the were very small so I was wondering how fast they would grow helped solve my question

Edited by Gccourtney
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Thank you for posting this. I enjoyed reading this. I too have been wondering how fast fish can grow.

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I Just bought my very first goldfish last week ^_^" he i mean i don't know whats its gender yet but i think its a male bec. he is chasing my gold dust molly (female) and actively swimming with them ... its my first goldfish a pearlscale baby about 1 month old ... he is pretty active and a fast swimmer to... next week ill give him a partner of his own knid but not type i will buy either oranda,moor or lionhead ^_^" btw his name is Brill

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I wanted to see how fast my goldfish fry would grow if given the best care. So I kept records of the growth rate of my goldfish fry after they became free swimming.

8 days 1/2 inch

15 days 3/4 inch

21 days 1 inch

4 weeks 1 1/4 inches

5 weeks 1 1/2 inches

6 weeks 2 inches

7 weeks 2 1/4 inches

8 weeks 2 1/2 inches

9 weeks 2 3/4 inches

10 weeks 3 inches

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Wasn't there someone on here who is taking photos of their goldfish every month or two with a ruler to show it's growth? Started sometime beginning of this year or near the end of last year I think...I could be totally off the mark tho.

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Wasn't there someone on here who is taking photos of their goldfish every month or two with a ruler to show it's growth? Started sometime beginning of this year or near the end of last year I think...I could be totally off the mark tho.

It's Courtney, measuring Peanut's growth.

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The fastest and largest common goldfish I've managed to grow under a year was 12 inches from 2 inches. If your looking to grow big fish, its essential you buy them young for all species of goldfish. They appear to do most of their growing in the first two years of their lives, after that, they slow down drastically. Many factors affect growth but age is probably one of the most important in my book. Once they past the growing ages, they slow down drastically. They are just like humans, they have a puberty phase. If you buy them after the puberty phase, you can expect them to stay around that size for a long time or grow very slow. You can feed them the best foods and have the best water in the world and they will no longer grow like they did when they were kids. If your looking to see how big you can grow one, buy young ones, generally fresh batches that hit the petstores, nothing that has been there for more then 2 months and appear to have faced many diseases. Just imagine a kid going thru puberty phase thats malnutritioned/diseased during the initial parts of it. I'll actually be conducting a fancy-goldfish growing experiment starting today ;). Perfect timing. I'll be hunting some young ones all day today.

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Great post xystic. Everything you said is right on. The grow experiment you did with your common goldfish is similar to the growth experiment that I did with my goldfish fry which were a cross between a comet and a black moore. All the fry were all single tails.

Welcome to the forum.

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Wouldn't the dimensions of the tanks be a factor, too? A 30 can be in different shapes. For example, a 30 in a certain dimensions can appear much bigger than a 40 and provide much more swimming space. Something like how its all in the illusions. My 33+ cube seems more like a 50.

Edited by THUNDER
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Wouldn't the dimensions of the tanks be a factor, too? A 30 can be in different shapes. For example, a 30 in a certain dimensions can appear much bigger than a 40 and provide much more swimming space. Something like how its all in the illusions. My 33+ cube seems more like a 50.

Generally goldfish need a tank that is long than Cubed..... It may seem bigger but it isnt.... Fancy goldfish should have atleast 20 gallons per fish and single tails should have 40 gallons per fish (they are pond fish)... Of course tank size can be a factor the bigger the better. Longer in length the better generally... there are a few kinds of Fancies that do better in tall tanks, like Ryukins and pearlscales...

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Goldfish grow very fast and you need to keep changing a tank so theY dont feel cramed best of look

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Goldfish grow very fast and you need to keep changing a tank so theY dont feel cramed best of look

If you get the right size tank, you don't have to keep changing. :)

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