How to breed fish

Reproduction - not just a stage of the life cycle of individuals. This is a guarantee of their existence and the guarantee of evolution in a changing environment. Fish is especially important, their adaptability to a variety of conditions is largely tied to the variety of terms and ways of their reproduction. To have a complete picture of all of them is necessary to examine in detail.

1
Parthenogenesis

It is impossible to say for sure how widespread this type of fish breeding environment, but it definitely is the most simple and safe. For parthenogenesis do not need fertilization of eggs male.
This method is considered to be one of sex, because the fry begins development of the germ cell. Just at the initial stage a step of combining offline heterosexual gametes. It is quite rare in the fish, but the result always turns adapted to the individual life.
The eggs of this kind is quite compatible with a number of fertilized eggs, does not rot and does not affect the viability of the masonry. Eggs develop to larval stage, but if the yolk sac will resolve the larva dies. Most often, the calf manages to develop to the stage of crushing.

2
sexual way

This method of propagation is the most common, because it multiplies them most of the known species of fish. The very process of fertilization thus occurs in different ways. That is, depending on the type of fertilization of fish are divided into:

Viviparous. Rear Front oviduct females has a structure resembling mammalian placenta. It was through her mother nurtures embryos necessary substances. Egg development takes up to 50 days maximum, in this period, at the rear fin females noticeably "pregnancy spot".
Breeders notice that the abdominal department females become rectangular at a time when it is ready to give birth any day now. Immediately after birth, the fry are able to swim and eat.
Yaytserodyaschih. The similar type of caviar flies to the egg in the back of his department and grows there until the fry is formed.
Egg-owned. Such fish swollen caviar directly into the water, where its further fertilization and development occurs.

Most fish at the same time multiplies several times for life. This type of reproduction is called polycycle, and in the case of the only reproduction for life - monocyclic.
In addition, fishes are divided into categories in the composition of the substrate, where they sword caviar:

Masonry in rocky soil - Lithophiles
Masonry in Sandstone - Psammofila
Choosing a place of laying in plants - phytophila
In mollusks, eggs are settled
Let the caviar in the free swimming in the water Pelagofila
In Il sword I caviar Pelief

In addition to these types of fish, there are still types, indifferent to the conditions in which they sworn caviar.

3
Other types of breeding

In addition to parthenogenesis, there is also its private species - hypogenesis. Under it, the males of this species in the fertilization of the masonry participation are not accepted. After the female is postponed by caviar, it must be fertilized by the males of other fish species, at the genetic level similar to this type.
After fertilization, sperm penetrates under the shell, but its fusion with an egg does not occur. From such eggs do not hatch the males.
In addition to such a very unusual method of development, it is also that fish simultaneously or alternately have sexual signs of male and females with all the necessary genitals. This is called hermaphroditism.
These fish are capable of producing cum and necessary for its fertilization. However, they do not cope with self-exploitation, since the caviar or spermatozoa can be formed at a time.
Some fish change sex several times during the life of life.
In fish there is no single duration of sexual maturity. Some are capable of bringing offspring a month after birth, others need from 15 years and more. The dates of ripening depends on the length of the life cycle, the form and environmental conditions.
Usually, the maturation is evidenced by the "marriage outfit" - the shift of the color, stains, and so on. In males, he appears earlier than the females. In young fishes, the first sponsors are unsuccessful or the firings hatching very little.