Colony Breeding is the easiest way to raise livebearers that can be sold for profit
It is easy to breed livebearers such as guppies and mollies. Many hobbyists joke that you just need water. But what if you want to produce large numbers of fish to sell for profit at your local fish store or aquarium society? What if your budget is tight and you don’t have the space or funds to build large tanks or ponds like commercial farms? Keep reading to see how we’ve produced hundreds of livebearers in a single fish tank with minimal effort and cost.
1. Pick Your Starter Fish
Most people get fry because their pet fish “accidentally” bred and some of the babies survived. You should make sure that you have the best parents and the best quality product if your goal is to provide local markets with high-quality fish. Look for fish with the ideal colors, patterns, shape, and size. To spot defects such as bent spines or missing fins, look at them from both sides and the top. You should aim for one male to every two or three females. The bare minimum you should start with is a trio of one male and two females, but you will be more successful if you can start your breeding tank with six, nine, or 12 adult fish instead. You can increase your fry production by increasing the quantity of fish. However, larger quantities also mean that the females are less stressed and not being constantly harassed from the males.
For some species like Endler’s livebearers, the females aren’t as colorful as the males, but aim to have at least 2-3 females per male to produce greater numbers of fry.
2. Install the breeding tank
We will use a method called “colony-breeding”, where the babies are raised in the same aquarium as the adults. Yes, you can get higher numbers by raising the offspring in a separate aquarium, but that requires more tanks, more aquarium equipment, more space in your room, and more time spent feeding and cleaning tanks. Although it produces less, this setup is the most efficient if you have limited time or money.
Keep in mind that we are trying to build a machine for making money, not a display tank. Adults will prey on their young, so we need to fill the aquarium with large amounts of algae, thickly grown plants, or even Easter grass. The tight spaces between the dense vegetation or material allow the young fish to escape but are too small for the adults to easily reach. They allow females to hide for a short time to get away from the males. The goal is to have so much cover that you cannot clearly see the middle of the mass. Our preferred type of cover is live aquarium plants because not only do they offer shelter, but they also look naturally beautiful and help purify the water by consuming toxic ammonia from your fish’s waste. Our favorite plants for breeding fish include water sprite, Pogostemon stellatus ‘octopus,’ and java moss. For more ideas, read our article on the top 10 aquarium plants for breeding fish.
The plants should be thick enough that it is difficult to see through.
The most popular livebearers available at the pet store often come from tropical climates, so you may need an aquarium heater if your room temperature is below their limits. In some cases, raising the temperature can increase metabolism, encourage more breeding, and speed up fry growth, but be careful not to heat the water so much that it shortens the fish’s life span. To clean the water, a filter is also a useful piece. Because of their gentle flow and ability to provide oxygen to the water, sponge filters are a good choice for breeding tanks. You should cover the motor intake tube of a hang-on back or canister filter with a prefilter sponge to prevent fry from accidentally swimming up to it.
Most livebearers live in harder, alkaline water, which is why many fish farms breed their livebearers in cheaper brackish water (a mixture of fresh tap water and ocean water) that has high pH and GH. But when customers take the fish home and put them in purely freshwater tanks, they end up going into osmotic shock and having massive health issues. To produce high-quality livebearers that are raised only in fresh water, we don’t recommend adding salt to your tank because then the fish will be harder to sell to local hobbyists and live plants won’t be able to survive in high salinity. However, if your tap water is very soft, we do recommend dosing mineral supplements like Wonder Shell or Seachem Equilibrium to prevent the fish from having problems with livebearer disease or the “shimmies.”
3. Overfeed the Tank
You want small food that can be spread throughout the tank. This will ensure that fry don’t need to venture out of their comfort zone or become overwhelmed by adults at mealtimes. Our favorite foods for young livebearers include live baby brine shrimp, crushed flakes, freeze-dried tubifex worms, frozen mini bloodworms, daphnia, and Easy Fry and Small Fish Food. It is crucial to give your tank plenty of food, with at least one feeding per day, to increase breeding and fry growth. This helps the adults eat more, so that there is less predation of their offspring. We like program an automatic fish food feeder to go off several times a day while we’re at work, and then we personally feed the livebearers once in the morning and once at night to observe their condition.
An auto feeder helps to ensure your fish get fed and continue growing, even if you are too busy or forget.
Water quality problems can quickly arise if excess fish food is left to rot in the aquarium, so make sure to adjust the portion size as needed and keep up on your water changes. For smaller livebearers like guppies, we’ve had success keeping Neocaridina cherry shrimp as the clean-up crew. Not only do they pick up all the leftovers, but they also serve as an extra source of live food for the livebearers. Plus, with all the hiding spots that you’ve provided the fish fry, some of the shrimp babies will survive and may become a second source of income that you can sell to your local fish store. If you prefer snails over shrimp, they are also excellent scavengers that can help pick any extra crumbs.
4. Take Out What’s Not Necessary
As a conscientious breeder, you have a responsibility to not sell undesirable fish to your customers, especially if they can cause health issues down the road. Therefore, it is necessary to regularly cull or remove unsuitable fish from your breeding pool. You may find that some of your offspring have missing fins or bent backs. You should also repeat the culling process every few weeks since some defects may not show up until the fry are a little older. The ideal environment for raising fry is the breeding tank. Therefore, it is important to remove any culls before the fry reach sexual maturity. This can be very difficult for livebearers. This practice also ensures that the remaining healthy offspring receive more food and have the best chance of survival.
Culling fish can be a time-intensive process since you must carefully examine each fry for any defects.
There are many methods to breed livebearers, including catching the females out and placing them in their own tanks. But colony breeding is much easier, especially if your time, money and space are limited. Each strain of fish only takes one aquarium, so you can potentially enjoy multiple varieties of livebearers at the same time while still maintaining the integrity of their lines. To learn about more best practices, check out our library of articles on breeding fish.