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Second, the application of chelated copper in aquaculture The farmers usually use the method of splashing copper sulfate to remove the large amount of green mud moss and bloom that are often produced in the aquaculture water. However, while the copper sulfate is killing the blue mud moss and bloom, It also causes great harm to farmed animals, especially shrimps and crabs. Chelating copper as an alternative to copper sulphate can retain the advantages of copper sulfate in insecticidal algae and it is far less toxic to aquatic animals than copper sulphate. The safe concentrations of small goldfish, juveniles and juvenile crabs are 12.5 mg/l, 10 mg/l and 6.5 mg/l, respectively. It is recommended to use the drug for 1 week. During this period, aerators should be frequently turned on for oxygenation. After 7 days, 2/3 should be replaced. The water and spatter 10-20 mg/l photosynthetic bacteria improve water quality.
Third, the application of betaine in aquaculture Betaine can not only improve the palatability of feed, increase food intake of animals, and can greatly shorten their feeding time. The addition of 0.3%-1% betaine to the fish carp has a significant effect of attracting and promoting growth. Adding 0.3% pure betaine or compound to tilapia compound feed can promote tilapia growth and reduce feed conversion by 3%-7.2%. Japanese scientists used 1.5%-2.5% betaine as a decoy added to the feed and found that it has a strong stimulatory effect on the taste organs of all farmed fish, which can attract fish to swallow, and prevent the feed from sinking into the pool bottom and causing waste. .
IV. Application of Extruded Compound Feed in Aquaculture After puffing aquatic compound feed, it can improve the digestion and utilization of starch by animals, and can make granular materials with different sedimentation rates, and can maintain good stability in water. In China, extruded aquafeeds have received more and more attention in recent years. Extruded feeds are widely accepted in the culture of crucian carps, frogs, and squid; the use of extruded feeds in the rearing of catfish, tilapia, and grass carp The amount has been continuously increasing; the application of extruded feed in marine aquaculture has also seen certain development.
Fifth, the application of Spirulina in aquaculture Spirulina in the form of living organisms or algal flour as aquaculture animal openings or seedling bait, or as an additive made of granular food. The algae powder is not easy to sink into water, does not agglutinate, and is not easy to spoil the water quality. It has the effects of promoting growth, enhancing disease resistance, improving the survival rate of larvae, and improving the body color of various aquatic animals. Spirulina powder in the shrimp bait feed additive is generally 0.5% -3%; generally added in the larvae feed 1% -2%; the amount of additives in the quail feed is generally 1% -3%.
Sixth, the application of glycosides in aquaculture The glycosides are natural bioactive substances composed of sugars, glycosides and organic acids, and are incompatible with other feed additives. The amount of glycosaminoglycan in feed is 200-500 mg/L, which can replace antibiotics and has no residue. It does not pollute the environment. After feeding, it can significantly improve the immunity and disease resistance of aquatic animals and promote growth. , Increase daily weight gain and feed conversion rate, and have anti-stress effect; At the same time have a stronger preventive effect on intestinal bacterial diseases. (Huang Shaolin)
First, the application of photosynthetic bacteria in aquaculture photosynthetic bacteria is a kind of aquatic microorganisms with photosynthetic pigments that can perform photosynthesis under anaerobic conditions. Photosynthetic bacteria have the function of resisting diseases and improving immunity. Using 5 ml/kg mixed photosynthetic bacteria can control bacteria and prevent diseases of fish and shrimp. Such as the prevention of rot disease, rotten mouth disease, etc., but also has a curative effect on a variety of fish diseases. In addition, photosynthetic bacteria can also be used as a kind of probiotic to regulate the growth of harmful bacteria in the normal flora in the intestine.