In seahorses, it's the male that is responsible for incubating fertilized embryos. The female seahorse deposits eggs into a pouch on the male's abdomen. The male releases sperm into the pouch, fertilizing the eggs. The embryos develop within the male's pouch, nourished by their individual yolk sacs. After the embryos have developed, the male gives birth to tiny seahorses.
Viviparous development occurs in some fishes with internal fertilization.
Fertilized eggs are retained and develop within the female's ovary or uterus. The developing embryo has a nutrient connection with the mother. E. Release of offspring. There is great variation in the development stage at which offspring are released. Depending on whether fertilization is internal or external and which type of embryonic development occurs, bony fishes may release eggs or sperm, larvae, or even sexually mature adult fishes.