In the oyster oyster breeding season, pro-fish anatomy was performed to detect gonad hypertrophy. Drainage water samples were used to check the number and development period of larvae in different water layers in the sea. The appendix was set to observe the attachment of different tide zones, different heights, and different dates. The amount of seedlings and barnacles attached, as well as the detection of relevant factors such as water temperature, specific gravity, and pH of the physical and chemical factors in the sea area, combined with other conditions of the sea area in the current year, analysis and judgment, and accurate forecasting of seedling picking time, the specific methods are:
(1) Pro-Bab Anatomy: Check the oyster and gonad maturation of pleated oysters. If the gonads are full, more than 60% of the egg cells in the microscope will be round or pear-like, and the spawning will reach a peak.
(2) Sampling inspection: The water layer distribution and quantity of planktonic larvae and barnacles of pleated oysters in 1-3 m layer of seawater in a 1-3 m layer of seawater, such as per cubic meter, were measured using a plankton net and a 3-meter long pumping cylinder. In water bodies, the amount of planktonic larvae in pleated oysters reached more than 2,000 or the composition in the middle and later stages of the crust was more than 100. When the water temperature was above 22°C, the attached seedlings would form a peak. If the water temperature is below 20°C, the seedlings will not reach the production requirements. For instance, if the barnacle larvae account for more than 1/3 of the seedlings, the barnacles should be attached and the seedlings should be put off.
(3) Observe with seedlings; seedlings are long attitude wooden frames made of wooden planks, 1.3 meters long, 15 centimeters wide, with 11 grades of glass slides, mounted on a fixed frame set in the picking area. After two days of replacement, check the attachment of seedlings and barnacles on glass slides to provide basis for pleated loops.
(4) The relationship between environmental factors such as water temperature, specific gravity, and pH, and the occurrence and attachment of pleurotus larvae were examined.
1 Water temperature: Water temperature has a significant effect on the occurrence and adhesion of larvae of pleated oysters. Before the “grass rain†in the coastal waters of Central Yunnan Province, the water temperature was below 18°C. Although there were several batches of spawning oysters in the pleated oysters, seedling attachment was rarely observed on vermiculite and on the attached seedlings until the beginning of May. Before and after, when the water temperature rises to 20-22°C, the larvae of the oysters are metamorphosed after 18-20 days of floating. When the temperature of the water rises to 23-27°C, it only takes 15-20 days to attach.
2 Specific gravity and PH value: According to our multi-year picking, pleated oyster breeding period, the proportion of seawater in the 1.020-1.022, PH value of 8.17-8.22, the seedlings can grow and grow normally and stable, only within the Bay in the appropriate proportion At a low point, there was a 1-2 day postponed seedling time, but the seedling density was higher, so the water temperature was 22-27°C and the specific gravity was 1.019-1.020, which was also the case for pleated oysters. advantageous.
(1) Pro-Bab Anatomy: Check the oyster and gonad maturation of pleated oysters. If the gonads are full, more than 60% of the egg cells in the microscope will be round or pear-like, and the spawning will reach a peak.
(2) Sampling inspection: The water layer distribution and quantity of planktonic larvae and barnacles of pleated oysters in 1-3 m layer of seawater in a 1-3 m layer of seawater, such as per cubic meter, were measured using a plankton net and a 3-meter long pumping cylinder. In water bodies, the amount of planktonic larvae in pleated oysters reached more than 2,000 or the composition in the middle and later stages of the crust was more than 100. When the water temperature was above 22°C, the attached seedlings would form a peak. If the water temperature is below 20°C, the seedlings will not reach the production requirements. For instance, if the barnacle larvae account for more than 1/3 of the seedlings, the barnacles should be attached and the seedlings should be put off.
(3) Observe with seedlings; seedlings are long attitude wooden frames made of wooden planks, 1.3 meters long, 15 centimeters wide, with 11 grades of glass slides, mounted on a fixed frame set in the picking area. After two days of replacement, check the attachment of seedlings and barnacles on glass slides to provide basis for pleated loops.
(4) The relationship between environmental factors such as water temperature, specific gravity, and pH, and the occurrence and attachment of pleurotus larvae were examined.
1 Water temperature: Water temperature has a significant effect on the occurrence and adhesion of larvae of pleated oysters. Before the “grass rain†in the coastal waters of Central Yunnan Province, the water temperature was below 18°C. Although there were several batches of spawning oysters in the pleated oysters, seedling attachment was rarely observed on vermiculite and on the attached seedlings until the beginning of May. Before and after, when the water temperature rises to 20-22°C, the larvae of the oysters are metamorphosed after 18-20 days of floating. When the temperature of the water rises to 23-27°C, it only takes 15-20 days to attach.
2 Specific gravity and PH value: According to our multi-year picking, pleated oyster breeding period, the proportion of seawater in the 1.020-1.022, PH value of 8.17-8.22, the seedlings can grow and grow normally and stable, only within the Bay in the appropriate proportion At a low point, there was a 1-2 day postponed seedling time, but the seedling density was higher, so the water temperature was 22-27°C and the specific gravity was 1.019-1.020, which was also the case for pleated oysters. advantageous.