The growth environment of oysters is closely related to the quality of oysters. Therefore, oysters have certain requirements for water temperature, bait and salinity in the growing area, and aquaculture enterprises need scientific and standardized farming methods.
Because oysters feed on microalgae and plankton in filtered seawater, the water area is the key factor affecting the growth of oysters. Generally speaking, the intersection of salt and fresh water will bring rich nutrients and promote the growth and reproduction of basic organisms in the sea area, thus providing bait for oysters and fattening them.
Oysters are widely distributed in the world, distributed in tropical, industrial tropical and temperate waters, with few species in the cold zone and no poles. Oysters live completely in seawater, generally in the intertidal zone to a water depth of about 20 meters, but some species only live in the intertidal zone and some species live in the slightly deeper subtidal zone.
Cultivation method of raw oysters
Oysters are divided into females, males, females and males. Androgyny only occurs in individual species, and androgyny should be out of sync, which is the so-called gender transformation phenomenon, which is a common phenomenon in oysters with high economic value.
For example, the first reproduction of Changzhuang oyster in that year may be male. And the second copy can be female, and vice versa. In different years, the frequency of similarity changes is higher. However, the first reproduction from larvae to adults is mostly male.
Oysters are cultivated in two ways: incubating and floating. Hatching species discharge eggs into the water cavity (gill cavity), where the early process of embryonic development is completed, and the mucus secreted by gill filaments is bonded into balls. Larvae leave their parents and directly enter the stage of floating life.
After developing into eyespot larvae in water, they attach and metamorphose into larvae. The type of floating culture is that sperm and eggs are directly discharged into seawater for fertilization, and all stages of embryo development are in water. Generally speaking, the larvae of planktonic species live freely in water for a long time.