Known for their peaceful nature, active behavior, and hardy adaptability, white cloud mountain minnows are a staple in the aquarium trade. Not only are white cloud minnows one of the most popular freshwater aquarium fish for beginners, but they’re also incredibly easy to breed. Whether you’re looking to save money by raising your own school or simply eager to try something new, white cloud minnows are the perfect species for beginner breeders.
In this guide, we’ll discuss how do white cloud minnows breed, including common courtship behaviors as well as details on egg laying and fertilization. Keep reading to learn how to set up a breeding tank for white cloud minnows and what steps to follow to ensure successful spawning.
Breeding Behavior of White Cloud Minnows
Sometimes referred to simply as white clouds, white cloud mountain minnows (Tanichthys albonubes) are small cyprinids native to China and Vietnam. They were originally discovered in the White Cloud Mountains north of Guangzhou in Guangdong Province, China. For a period of over twenty years, the species was thought to have gone extinct in its native habitat but additional wild populations have since been found.
White clouds are still considered an endangered species by Chinese governmental agencies, though the IUCN lists the species as Data Deficient. Fortunately, because white cloud minnows are easy to breed, the aquarium trade can rely solely on captive-bred specimens.
Like many cyprinids, white cloud minnows are egg scatterers. Rather than depositing their eggs on vegetation or building nests, white clouds release their eggs into the water column during spawning. The eggs eventually settle or stick to plants, substrate, and other surfaces, but the adults provide no parental care. White clouds will eat their own eggs and fry, given the chance, but a thoughtful breeding tank setup can help minimize predation.
Recommended Tank Setup for Breeding
White cloud minnows are prolific breeders but if you want the fry to survive to adulthood, you’ll need to be intentional with your tank setup. There are two popular approaches to breeding white cloud minnows:
-
Group Spawning: Keep a large school of white cloud minnows in a species-only tank and allow them to breed freely, hoping some of the fry will survive.
-
Breeding Tank: Set up a separate breeding tank and remove the adults once the eggs begin to hatch, so you can care for the fry independently.
Whichever option you choose, you’ll need to maintain ideal breeding conditions in the tank and condition your fish to encourage spawning. White clouds are native to cool mountain streams, so they don’t necessarily need a heated tank to thrive. To promote breeding, however, it’s best to maintain a stable tank temperature of 68 to 72 degrees Fahrenheit with a pH range between 6.5 and 7.5. Soft water is ideal for spawning and gentle filtration (such as a sponge filter) is recommended for breeding tanks that will house developing fry.
The most crucial element of breeding tank setup is the spawning substrate. White clouds scatter their eggs, and you want them to settle somewhere that provides some protection until the eggs can hatch. Lining the bottom of the tank with clumps of plants (like java moss) or a spawning mop is the easiest option.
Courtship, Egg Laying & Fertilization
White cloud minnows will generally spawn on their own in suitable tank conditions. To encourage spawning, however, it’s important to condition your adult fish with a varied diet of healthy foods. Protein-rich live and frozen foods like brine shrimp, daphnia, and bloodworms are preferred but high-quality dried foods can work as well.
As you’re conditioning your white clouds, watch for courtship behavior that indicates the early stages of spawning. You may notice males flaring their fins or sparring with each other in an attempt to claim territory in the tank. The males may also chase the females around the tank then hover next to them to stimulate the release of eggs, fertilizing them as they’re released.
Until your white clouds achieve sexual maturity and start displaying courtship behavior, it can be difficult to tell the sexes apart. Males tend to be more brightly colored with slimmer bodies than females, who develop rounded abdomens as they fill with eggs. If you’re setting up a separate breeding tank, aim for a ratio of one male for every two to three females. This allows for continuous egg laying without exhausting the females.
Caring for Eggs & Fry
If you’re going with the group spawning strategy, you may choose to let the eggs hatch and the fry develop naturally. Even if you have a separate breeding tank setup, you’ll want to leave the adults in the tank for at least 24 hours once spawning begins. Female white clouds can release up to 300 eggs per spawning cycle, and the cycle can last up to a few days.
White cloud mountain minnow eggs usually take 36 to 48 hours to hatch. During this time, the adults may eat the eggs if they’re easily accessible but predation tends to decline as the fry become freeswimming. In a breeding tank setup, it’s best to remove the adults once the eggs begin to hatch.
At this point, it will still be a few days until the fry start swimming around the tank. After hatching, the fry will absorb the remainder of their yolk sacs over a period of 3 to 4 days. Once they become active, you can start feeding them liquid or powdered fry food then transition onto newly hatched brine shrimp or microworms as they grow. Within a few weeks, the fry should be big enough to start accepting finely crushed flake foods.
Tips for Successful Breeding
While white cloud mountain minnows are known for being easy to breed, certain conditions must be met for them to do so. The good news is that these fish are very adaptable, so as long as your tank conditions are stable and you provide a suitable diet, they should be eager to breed. To help encourage a successful breeding operation, here are a few simple tips:
-
Start with as big a school of white clouds as possible to ensure you have a mix of males and females, then select the healthiest specimens for breeding as you condition them.
-
Make sure your tank (both your main tank and breeding tank) is fully cycled and mature before introducing your fish, then monitor the parameters and maintain stability.
-
Take care to minimize stress on your fish throughout the process. For example, match the conditions in your main tank and breeding tank as closely as possible.
-
Give your breeding tank time to develop a colony of infusoria (microorganisms) and biofilm to provide a natural food source for newly hatched fry.
-
Avoid using substrate (other than your java moss or spawning mop) in the breeding tank, so it’s easier to remove uneaten food and other debris.
Now that you know how to breed white cloud mountain minnows, you’re ready to try it for yourself. Shop for other beginner-friendly fish on Shrimpy Business or stock up on live plants to build out your tank!