Males have slimmer bodies with a slightly red hue, while females have bigger, silver bellies full of eggs. However, since the zebra danios aren’t livebearers and they don’t carry the fertilized eggs, the pregnant fish aren’t visibly too fat. Eggs are laid in gravel bed and hatch in two days. The male and female then eat the eggs.So the thing to do is make up a spawning tank with multiple layers of marbles on the bottom instead of gravel. If they are not fertilized … Since danios are not livebearers and female danios never carry fertilized eggs, this is as close as danios get to being pregnant. Look at your female danio. If your female is carrying roe, your male danio will fertilize the eggs as … Sexing. This fish spawns within 24 hours in a day. Hi, Keira ... just read your "Additional Details." The Zebra Danio (Danio rerio) is a freshwater fish species of the Cyprinidae family.They are a widely distributed species ranging from India up to Nepal. Zebra Danio Breeding: Ideal Temp: 78°F (26°C) Difficulty: Very Easy; Gender Differences: Females are generally bigger; Other Breeding Tip: Zebra Danios will eat their fry. Zebra danios lay non-adhesive eggs,high in the water column.The male then fertilizes them as they sink to the bottom. well i've been doing research on this topic, and someone told me that maybe the danio is keeping the eggs, waiting for them to be fertilized. Your female Zebra Danios typically have a rounder belly than the males. Periodic mating keeps eggs healthy, but making all those eggs takes a lot of work, so individual females should only be mated once per week. Therefore, if there was no male present to spawn with her at the time she laid the eggs, the eggs can't possibly hatch. In any case, you will have to be extra vigilant to find out if your zebra danio is male or female. The fertile eggs in translucent color and infertile eggs are white in color. They don’t hurt each other and don’t harm other fishes. The male fertilizes the eggs as the female expels them from her body. I breed zebra danios and I always have pregnant females and never have I've seen one that big I suggest you move her to a temporary tank with heater and filter also some tank water and if she doesn't like pop any eggs in 4 days I suggest you try to diagnose it further she just looks too big This species is one of the most common aquarium fish due to a number of different reasons. Zebras are very prolific breeders. The eggs would be small, totally separate from each other and clear. Young species are not formed completely, so both males and females are very much alike. If she looks wider than normal, she is probably carrying roe. Males have gold stripes and females have silver stripes. Also, be sure you are looking at a female. Fish Behavior You need to feed high-quality food to the fish during the time of spawning and hatching eggs. However, the eggs cannot be fertilized as Zebra Danios … What’s your experience with Zebra Danio’s? they'll keep making more eggs hoping that a male will come along, but then after awhile they release them unfertilized. It sounds as if those eggs might be fertile. It is possible to tell between the male and female only for adult species. A female will not be as brightly colored as a male.However, if your female looks rounder than usual, she may be carrying eggs. Zebra danios do not have internal fertilization. Sorry. Zebra danio chase each other, but such a behavior doesn’t demonstrate aggression, this is how they live in a school. Danios are eggs scatterers so it's possible the eggs are from a danio, but the eggs are not particularly sticky, so I would expect them to fall off a leaf in the water currents. Zebrafish undergo sexual reproduction, so breeding requires both male and female fish. These zebra danios are laying eggs in a patch of java moss. 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