1, bait feed - bait series for oysters and other shellfish fertilized eggs or larvae, rotifers, Artemia larvae, copepods, fish gills, fish and artificial diet. Feeding amount is generally controlled by oysters and other shellfish fertilized eggs or rotifers at 0 to 10/mL, rotifers at 5 to 10/mL, Artemia larvae at 2 to 3/mL, copepods at 0.5 to 2/ mL, fish gills, fish and artificial diets with 20-25 g/106 tails. Regularly check the density of the bait in the body of water and the juvenile fish's stomach fullness, and adjust the number of feedings and feeding amount at any time. The rotifers to be fed should be fortified with high concentrations of algae for more than 12 hours. Artemia larvae should be fortified with a 50-DE fortifier for more than 6 hours in order to increase the content of unsaturated fatty acids in the diet and meet the nutrient requirements of various developmental stages of the larvae.
2, water quality control - 1 plus water: pre-mainstream to add water, 5 days after the start of changing the water, changing the water volume of 20 to 30%, 10 days after the replacement of water 40 to 70%, 20 days after the change of water 80 ~ 100%, change the water after 30 days of age 100 ~ 200%, divided into. When the water is changed, the temperature difference is less than 1°C and the salinity difference is 2‰. 2 Sewage absorption, turning the pool and grading culture: from the 6th day of age to stop the gas suction, suction slowly and carefully, the pool bottom bait, feces as much as possible to absorb; 13 ~ 15 days of age of fish fry enhanced, to prevent Water quality is aging, acidity and alkalinity drop, can be turned over to keep the water fresh, and adjust the cultivation density; turning the pool is usually carried out at night, using light trapping method or net box collection method, the operation must be careful so as not to damage the fry; 20 days old After the gap between larvae and juveniles increases, the fin spines become hard and long, and it is not appropriate to turn pools and sorting; after 35 days of age, the fin spines disappear and can be graded according to size; larval rearing density: body length <1cm, The density of cultivation is 8000 to 15000 tails/m3. When the body length is 1.5 to 2.5 cm, the density is 3000 to 5000 tails/m3. When the body length is >2.5 cm, the density is 1000 to 3000 tails/m3. 3 Add algae: In order to stabilize the water quality of nursery ponds and strengthen rotifer nutrition in the ponds, artificially cultivated chlorella and Platynphaeria are added daily from the age of 2 days, and the amount of added algae is controlled by chlorella at 10-300000/mL. Algae 1 ~ 30,000 / mL.
3, daily management - daily measurement of water temperature, irregular measurements of salinity, ammonia, pH. Adjust the water quality at any time: control the water temperature 23 ~ 25 °C, salinity 28 ~ 30, pH 7.8 ~ 8.2, dissolved oxygen 5mg / L or more.
4, fish out of the pool - the body length of 2.5cm or more, you can go out of pool culture. The water temperature should be gradually lowered before leaving the pool, which is close to the natural outdoor water temperature. In order to improve the anti-stress ability and survival rate of fish fry after being out of the pool, regular pull nets should be exercised regularly, and the time of ebb and flow tide in natural sea area should be taken as a regular time. Out-of-pool use light-induced or pull-net method for centralized collection, counting out and out of aquaculture.
2, water quality control - 1 plus water: pre-mainstream to add water, 5 days after the start of changing the water, changing the water volume of 20 to 30%, 10 days after the replacement of water 40 to 70%, 20 days after the change of water 80 ~ 100%, change the water after 30 days of age 100 ~ 200%, divided into. When the water is changed, the temperature difference is less than 1°C and the salinity difference is 2‰. 2 Sewage absorption, turning the pool and grading culture: from the 6th day of age to stop the gas suction, suction slowly and carefully, the pool bottom bait, feces as much as possible to absorb; 13 ~ 15 days of age of fish fry enhanced, to prevent Water quality is aging, acidity and alkalinity drop, can be turned over to keep the water fresh, and adjust the cultivation density; turning the pool is usually carried out at night, using light trapping method or net box collection method, the operation must be careful so as not to damage the fry; 20 days old After the gap between larvae and juveniles increases, the fin spines become hard and long, and it is not appropriate to turn pools and sorting; after 35 days of age, the fin spines disappear and can be graded according to size; larval rearing density: body length <1cm, The density of cultivation is 8000 to 15000 tails/m3. When the body length is 1.5 to 2.5 cm, the density is 3000 to 5000 tails/m3. When the body length is >2.5 cm, the density is 1000 to 3000 tails/m3. 3 Add algae: In order to stabilize the water quality of nursery ponds and strengthen rotifer nutrition in the ponds, artificially cultivated chlorella and Platynphaeria are added daily from the age of 2 days, and the amount of added algae is controlled by chlorella at 10-300000/mL. Algae 1 ~ 30,000 / mL.
3, daily management - daily measurement of water temperature, irregular measurements of salinity, ammonia, pH. Adjust the water quality at any time: control the water temperature 23 ~ 25 °C, salinity 28 ~ 30, pH 7.8 ~ 8.2, dissolved oxygen 5mg / L or more.
4, fish out of the pool - the body length of 2.5cm or more, you can go out of pool culture. The water temperature should be gradually lowered before leaving the pool, which is close to the natural outdoor water temperature. In order to improve the anti-stress ability and survival rate of fish fry after being out of the pool, regular pull nets should be exercised regularly, and the time of ebb and flow tide in natural sea area should be taken as a regular time. Out-of-pool use light-induced or pull-net method for centralized collection, counting out and out of aquaculture.
An Extract is a substance made by extracting a part of a raw material, often by using a solvent such as ethanol or water. Extracts may be sold as tinctures, absolutes or in powder form. The majority of natural essences are obtained by extracting the essential oil from the blossoms, fruit, roots, etc., or the whole plants, through four techniques.
Now this is used in medicine area to help to get the pure substance of the herb. This kind shows several most popular extracts in the market.
Extract
Plant Extract,Herbal Extract,100% Natural Extract,Flower Extract
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