How Oysters Reproduce
In the first year of its life, an oyster animal becomes capable of laying female eggs, releasing sperm, procreating and reproducing. Most types of oysters prefer reproduction when the water temperature is between temperatures ranging from 20 to 30 degrees Celsius, which are the ideal temperatures for oyster reproduction.
- The oyster breeding process is produced without any direct physical contact between the male and the female. As the female oyster lays her eggs in the water. Then this process takes place through the male fertilizing these eggs to produce larvae whose organs begin to differentiate four hours after vaccination, and two weeks after the process Fertilization, the larva begins to swim using its feet in the water and searches for a place to settle on the ocean floor.
- The oyster breeding process results in the release of a huge number of sperm produced by the male, which may reach approximately 2.69 billion sperm. While the female oyster produces approximately five million eggs. Despite this huge number of larvae, only about a million larvae survive, due to the harsh water conditions. The larvae feed on phytoplankton, and the larvae drift with the water, in order to search for food sources.
Oyster spawning and spawning season
The spawning season usually begins for oysters when the environmental conditions become suitable, specifically when the water temperature in which the oysters live becomes about 20 degrees Celsius or approximately 68 degrees Fahrenheit. Therefore, there are several seasons for oysters to spawn around the world, depending on the change in the temperatures of the aquatic medium in which they live. It has oysters in all seas and oceans of the world. In general, the oyster spawning season usually starts from the end of June to the middle of August, and one oyster can stimulate the spawning process, as it releases sperm into the water, and at that time, all the nearby oysters begin to do the same The old oyster then releases the eggs into the water.
Most types of oysters on earth are hermaphrodites, meaning that they possess certain aspects and characteristics of both sexes, both male and female, in other words, some types of oysters have male reproductive organs and female reproductive organs, and among the strange characteristics that characterize some species Oysters, that they can switch sex throughout their life.  During the breeding period, female oysters or oysters that have female reproductive organs release hundreds of eggs into the water, and these eggs are also fertilized through sperm released by male oysters or oysters that have male reproductive organs and produce sperm. 
Types of oysters
Oysters belong to the mollusc family, which is characterized by soft bodies that do not contain a backbone, and oysters have five types classified according to their place of residence, we mention them as follows:
Japanese oysters : He takes the Pacific Ocean off the Asian coast as a place where he lives and settles.
Kumamoto oysters : This type of oyster lives in the Pacific Ocean off the Asian coasts.
European flatfish : This type of oyster lives on the coasts of western and southern Europe.
Atlantic oysters : This type of oyster lives on the east coast of the United States.
Olympia oysters : This type of oyster lives in the eastern and western coast of the United States.
The Pearl Inside Oyster
The pearl consists of a calcareous substance whose chemical composition is similar to that of the inner surface of the oyster, so this substance sticks to the shell or enters inside it, then it turns over time into a bead of pearl, and the process of producing a pearl bead inside the shell takes about five years to reach the shape that we see on it.  Pearls can also be produced by culturing the mother-of-pearl in-shell by hand, a process largely performed in Japanese or Australian coastal waters.