Lots of fish-keepers love the idea of having a big, impressive fish to show off to their friends. So it’s no surprise that people ask us how to make goldfish grow.
You will need lots of tank space, quality water, warm temperatures and a nutritious diet to make a goldfish grow to a large size.
Goldfish Growth Rate
Did you know that the average growth rate of a goldfish is about an inch per year?
It’s hard to believe that goldfish, even the fancy ones, get as large as they do. So-called “feeder fish” can start out at an inch long at the pet store, but can grow to over 12 inches!
Meanwhile, average breeds of fancy goldfish can easily grow to 6 to 8 inches. Possibly more.
But how do you make sure that your goldfish grows big? Is there a way to make your goldfish grow more and grow faster?
We’re going to explore the five factors that influence goldfish growth rate.
How to make goldfish grow faster?
A combination of a good diet, lots of tank space, warm temperatures, and good water quality will make your goldfish grow.
It also helps to choose a goldfish with the right genetics. Though you will need to go to a breeder to know whether your fish had large parents!
Having a good diet is important from the first 10 months of a goldfish fry’s life. Serious breeders feed goldfish fry a high protein diet of live foods, such as micro-worms and baby brine shrimp. This stimulates growth and helps to produce the largest fish.
The runts in a spawn, who do not get as much food as the others, will not reach the size of their siblings. Some fry will never get more than a few inches long for the rest of their lives because of a poor diet.
As a goldfish ages, a nutritious diet still plays a big part in its growth. This is why feeding good food is a must. Live foods and veggies, in addition to a good protein staples, like pellets, can help your goldfish grow.
However, you must never overfeed your goldfish! Overfeeding will pollute your water and cause your fish to become constipated.
#2: Tank Size
Many goldfish have the potential to reach an impressive size, but then their owners buy an undersized tank or overstock. Not having enough tank space will stunt a goldfish’s growth.
Also, in small tanks, activity is restricted so your fish will get less exercise. Plus, goldfish will be stunted by the build up of growth hormones in a tank packed with too many fish.
Sadly, stunted goldfish are permanently impacted and the damage is irreversible.
You can help your fish to grow big and stay healthy by providing enough space for your goldfish to swim.
Temperature plays a role in the growth rate of goldfish.
Goldfish kept in warmer water temperatures consume more oxygen, eat more food and are generally more active.
Water kept in the mid 70s Fahrenheit is ideal for goldfish growth.
The growth potential of your goldfish is limited by their genes.
Unfortunately, unless you are a goldfish breeder, you really can’t do much about this one!
Buying goldfish from a quality breeder, rather than a chain store can help ensure your goldfish has good genes for growth.
#5: Water Quality
Maintaining good water quality is vital to your goldfish’s health. And it plays a role in the growth of your fish too.
When toxins are present in the water, goldfish cannot grow normally and must channel their strength into surviving. Doing regular weekly water changes is therefore essential for your fish.