Before gives birth, the belly will expand, because they are ovoviviparous, so the belly will be larger than the oviparous fish. When they have big bellies, keepers need to isolate them, otherwise they will be irritable and even attack other small fish. After isolation, they will stop their activities and find a safe and hidden place to lay eggs, such as in water plants, corners and so on. And when they are about to give birth, the belly of Mary fish will turn black and the ovipositor near the anus will descend, which is their body's preparation for giving birth.
1, keep the environment quiet: Mary fish to the date of birth has not been born, may be the environment is noisy, breeders had better move them to a quiet environment. This can effectively alleviate their anxiety during childbirth, and can also achieve the effect of oxytocic.
2. Raise the water temperature: You can also raise the water in the fish tank to 28 ℃ and turn on the oxygen pump to increase the dissolved oxygen in the water. This can also effectively induce labor.
3. Create a flow of water: If you find that Mary fish are difficult to produce, you can use a pump to create a slight flow of water, or slowly pour in new water to hit their abdomen. But the action should be gentle to avoid them being frightened.
