In terms of spermatogonia distribution, the structure of teleosts testes has two types: Gonopodia are found on the males of some species in the Anablepidae and Poeciliidae families. The genital papilla is a small, fleshy tube behind the anus in some fishes, from which the sperm or eggs are released; the sex of a fish often can be determined by the shape of its papilla. From Wikipedia, the free encyclopedia. Reproduction and Life Histories, pp. Once fish become reproductively mature, they stay that way.
The type of spawning that occurs depends on male body size.
How Do Fish Have Sex?
The males do not have to compete with other males, and female anemone fish are typically larger. Smaller eggs are less costly in energy to produce, so more can be produced. The first all-female unisexual reproduction in vertebrates was described in the Amazon molly in In the first type, the oocytes are released directly into the coelomic cavity and then enter the ostiumthen through the oviduct and are eliminated. In these cases, the male is equipped with a pair of modified pelvic fins known as claspers. Males go looking for love right after they hatch. The Timetree of Life: