Zebra danios do not have internal fertilization. If she looks wider than normal, she is probably carrying roe. Zebras are very prolific breeders. If your female is carrying roe, your male danio will fertilize the eggs as … Therefore, if there was no male present to spawn with her at the time she laid the eggs, the eggs can't possibly hatch. Fish Behavior You need to feed high-quality food to the fish during the time of spawning and hatching eggs. This species is one of the most common aquarium fish due to a number of different reasons. Young species are not formed completely, so both males and females are very much alike. This fish spawns within 24 hours in a day. Also, be sure you are looking at a female. The male fertilizes the eggs as the female expels them from her body. 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. It sounds as if those eggs might be fertile. 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 danio chase each other, but such a behavior doesn’t demonstrate aggression, this is how they live in a school. they'll keep making more eggs hoping that a male will come along, but then after awhile they release them unfertilized. Eggs are laid in gravel bed and hatch in two days. Sexing. They don’t hurt each other and don’t harm other fishes. 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. In any case, you will have to be extra vigilant to find out if your zebra danio is male or female. Your female Zebra Danios typically have a rounder belly than the males. 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. Males have gold stripes and females have silver stripes. 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 It is possible to tell between the male and female only for adult species. Zebra danios lay non-adhesive eggs,high in the water column.The male then fertilizes them as they sink to the bottom. Males have slimmer bodies with a slightly red hue, while females have bigger, silver bellies full of eggs. What’s your experience with Zebra Danio’s? Zebrafish undergo sexual reproduction, so breeding requires both male and female fish. Since danios are not livebearers and female danios never carry fertilized eggs, this is as close as danios get to being pregnant. These zebra danios are laying eggs in a patch of java moss. If they are not fertilized … Hi, Keira ... just read your "Additional Details." Look at your female danio. The fertile eggs in translucent color and infertile eggs are white in color. However, the eggs cannot be fertilized as Zebra Danios … So, you can arrange a separate tank of 5-10 gallons where you can keep a male and a female Zebra Danio in 71-80° F (21-26° C). 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. However, since the zebra danios aren’t livebearers and they don’t carry the fertilized eggs, the pregnant fish aren’t visibly too fat. A female will not be as brightly colored as a male.However, if your female looks rounder than usual, she may be carrying eggs. 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