Pregnant guppies can give birth to anywhere between 10 and 50 baby fish! Genetics, the availability of food, the mother's health, and a bit of luck will determine the exact number. Age is a significant factor, too. Younger fish giving birth for the first time tend to have fewer babies in the beginning. The fry is often smaller and weaker as well.. For most sharks, gestation periods range from 6 months up to 2 years depending on the species. The enormous whale shark has the longest known shark pregnancy approaching 3 years before giving birth to hundreds of pups. Skates and rays typically have shorter gestation periods lasting 1-12 months. Seahorses.

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Look for your species name online to find out whether it lays eggs (oviparous species), or gives live birth (viviparous). The females of some fish species are able to store sperm for months before using it to fertilize eggs, so a new tank with females only can sometimes still reproduce. 2. Watch for signs of nesting.. 1. Swollen Abdomen: Pregnant live-bearing fish often have a bigger belly compared to non-pregnant fish. 2. Dark Gravid Spot: The gravid spot, which is near the ventral fin, darkens when the fish is pregnant. 3. Behavioral Changes: Expectant fish might act more aggressive, hide more often, or eat less. 4.