The world of fishes is very different. The majority of types breed by means of caviar, but there are also viviparous fishes. Also methods of throwing of caviar, a condition in which there is this process differ. Even viviparous fishes depending on a look bring into the world whitebaits differently, degree of readiness of cubs for independent existence also depends on it.
Instruction
1. Many fishes breed by means of throwing of caviar, but at different types it occurs differently. For example, such look as aterina-grunion swim most close to the coast and during inflow appear practically on naked sand, in this damp sand they also lay the caviar then it is impregnated by males. At aterina-grunion process of postponement and fertilization of caviar happens very quickly, they have to be in time until as they will be overtaken by the following wave. Whitebaits hatch from berries soon enough, and with inflow approach the kids go to the ocean.
2. Red caviar of salmons is appreciated as a tasty and useful delicacy. Interesting the fact that salmons for throwing of caviar migrate from salty waters in freshwater reservoirs. These fishes work together - couples. The male and a female dig out previously a peculiar nest at the bottom of a freshwater reservoir, at the same time they protect the attracted territory from rival fishes. Very important point for salmon is that gametes of both parents appeared in water at the same time, otherwise fertilization will not happen. Many species of salmons are capable to reproduction only once in life more that they just die after spawning. For example, so happens to the Pacific salmon.
3. In the nature, of course, there are also viviparous species of fish. They do not throw caviar, and bring into the world already quite created posterity - whitebaits who can independently live and develop at once. One of strange features of viviparous fishes is that after throwing of whitebaits mummy can eat easily own cubs, it cannot just distinguish them from other forage.
4. There are also such species of viviparous fishes at which whitebaits eat by means of mother. They are attached directly to her body. At others whitebaits hatch from berries, but it occurs in fish mom, just before the birth. Some species of sharks - viviparous fishes. To fans of an aquarium such viviparous small fishes as sword-bearers and the guppy are well-known. These are very unpretentious creations in many respects thanks to the fact that are born in the form of the whitebaits who are already adapted to existence.