In many freshwater species, warmer weather induces spawning and also occurs anywhere between April and also early June, possibly later on for some fish. In captivity, the water temperatures in your tank are mostly stable and also constant, for this reason spawning can carry on transparent the year. Usual aquarium fish choose Angelfish need nothing but an ideal water problems to spawn, and also you’ll often discover yourself in the place of having actually eggs to address even if you don’t intend ~ above breeding.

You are watching: How long does it take for fish eggs to hatch in a tank

If you want the egg to hatch, however, it’s ideal to relocate them come a separate tank to make sure they space safe from various other fish — the said, even the mothers regularly eat their own eggs. Most fish will lay your eggs ~ above a difficult surface, favor the tank wall surface or a vast plant leaf, relying on what’s available, for this reason you’ll must be cautious when relocating them, or ideally, friend should relocate the male and female come a separate reproduction tank before spawning even begins.

Females have the right to lay hundreds or also thousands of eggs in a single spawning, and also a single male can not fertilize all those eggs. The much more males the you have actually in the tank, the better the opportunity of successful fertilization.

Image Credit: Gabor Horvath, Shutterstock


In most freshwater species, hatching must take no much longer than a week if the water temperature in her tank is warm and stable. If the fish live in a slightly chillier environment, the process may take it a couple of days longer. That said, there room so many varieties of fish that have the right to be maintained in aquariums, that is a an overwhelming question to give an exact answer to. Below are a few of the most common aquarium types and how long your eggs will generally take come hatch:

Bettas:2-3 days
Discus:3-4 days
Goldfish:2-7 days
Cory Catfish:3-6 days
Angelfish:4-7 days
Tetras:2-5 days
Bristlenose Pleco:4-10 days
Danios:1-2 days
Gourami:2-4 days

How do you recognize if the eggs space fertilized?

If the eggs are white after 2-3 days, the spawning was unsuccessful, an interpretation they were not fertilized (usually the instance if there is no male) or they have been killed by bacteria. Depending upon the species, fish eggs are typically a light brown color, and tiny eyes will end up being visible in them quickly after fertilization. Part females and other fish in the tank may eat the unfertilized eggs, so even if they are not fertilized, you need to remove them from the tank. Also, few of the eggs might be too close together and not get sufficient oxygen, and they’ll go white through fungus, however some eggs around them might be fertilized and healthy, for this reason you’ll desire to provide those a possibility at hatching.

Image Credit: Mr. Piyapong, Shutterstock

Do all freshwater aquarium fish lay eggs?

Members the the Poeciliidae genus, such as Guppies, Mollies, and Swordtails, room livebearers, an interpretation they give birth to live young. For this reason while these fish do not lay eggs, they do have actually eggs that remain in their body till the fry room old enough and able to swim freely. In most cases, this takes 20-30 days but can vary amongst fish species.

See more: How Do You Say 69 In Spanish : 60, 69 In Spanish



In many cases, her fish’s eggs should hatch in 3-7 days, occasionally much less or occasionally more. The incubation time can vary depending on species, tank conditions, and water temperature, yet it should never take more than 10 job for most fish species. If you an alert that the eggs space white after ~ a day or two instead of the usual irradiate brown, they space not viable and also will no hatch.

Breeding your very own freshwater fish is an exciting and profitable process, and in ours opinion, something that every aquarium owner need to experience at some point!