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Just do a quick search on the internet and you can instantly know what species of fish you breed lays eggs or gives birth to. You’ll know if you need to watch the fish’s belly swell because of pregnancy or if you should notice the tiny round jelly-like eggs in the aquarium. If you’re planning to raise juveniles, try to learn as much as you can about the species of fish you’re keeping, as raising juveniles isn’t always easy.
Steps
Recognizing pregnant fish
- Search online for the name of the fish you are keeping to see if it is an oviparous or a live birth (viviparous).
- For some fish that are difficult to sex, you may need to consult a specialist at your aquarium store.
- Some species such as the snout have a natural bulge, but the bulge is located in the front, just below the gills of the fish.
- “Overweight” males may have a bulge in the anterior pectoral. If you do not feed the fish for two or three days, the bulge may shrink, while the enlarged abdomen of the pregnant female is still visible.
- This spot may always be present in some fish, but the color of the dot will become lighter or darker as the fish becomes pregnant.
Recognize signs of nesting and laying eggs
- Look up the name of the fish you keep online to see if they are oviparous, or live birth (viviparous).
- In some fish species, the female has the ability to store semen for several months before using it to fertilize eggs, so a new aquarium filled with only female fish can still spawn.
- Many species of spawning fish also engage in mating behaviour, including most fortune teller fish. They often show a very energetic expression, which lasts several hours and ends with egg-laying.
Raising baby fish
- For more detailed information about a particular fish, follow these guidelines for breeding and keeping discus, fortune teller, betta, and guppies.
- Ask for advice from an aquarium shop staff or an online forum of aquarists. Advice from those places is often more helpful than advice from a general pet store.
- If the brood spawns in the nest and protects the eggs from other fish, use a net to separate the brood and eggs on one side and the other fish on the other.
- If the mother fish gives birth or lays eggs in the water, you need to keep the adult fish on one side of the net. The fry can swim through the net to avoid the adult fish.
- If you can’t go to the aquarium store, you can feed the fry with well-boiled egg whites pressed through cheesecloth.
Advice
- If you don’t want the fish to spawn, you need to separate the male and female fish. If it’s too late, you should contact the aquarium shop. They can take fish.
Warning
- If the fish is getting fat, moving slowly and the scales are erect, you need to seek professional advice or at a pet store. It is possible that the fish is sick, not pregnant.
- Unless you create the right environment, most or all of the fry will die.
- Never release fish into the wild, unless that’s where you brought the fish home. If not, you may unknowingly introduce an environmental destructive infestation in the area.
Things you need
If you want to keep the fry:
- Small backup fish tank or mesh divider
- Small sponge filter with pump and accessories
- Food for fry
- The right place to raise the fry when they are big and the tank becomes cramped
wikiHow is a “wiki” site, which means that many of the articles here are written by multiple authors. To create this article, 46 people, some of whom are anonymous, have edited and improved the article over time.
This article has been viewed 87,046 times.
Just do a quick search on the internet and you can instantly know what species of fish you breed lays eggs or gives birth to. You’ll know if you need to watch the fish’s belly swell because of pregnancy or if you should notice the tiny round jelly-like eggs in the aquarium. If you’re planning to raise juveniles, try to learn as much as you can about the species of fish you’re keeping, as raising juveniles isn’t always easy.
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