When the eel fry has hatched for four days, its eyes have not yet developed, and the entire body remains white and transparent. Under a microscope, you can begin to see the gut and blood vessels, indicating that the fry is ready to start feeding. At this stage, they are highly selective and prefer live prey such as smaller fish, zooplankton, leeches, and aquatic insect larvae. Even if food is available, the eel fry would rather starve than eat dead or non-living matter. They show a strong preference for live fish, which makes it essential to prepare suitable bait fish when breeding squid.
Before breeding squid, it's important to raise a sufficient supply of live bait fish. The best options include swim-up brine shrimp and small fish like minnows. These should be cultured and then introduced into the environment where grass carp will be raised. After three days, the squid’s bait fish should be perfectly matched in size and availability.
By day five, the yolk sac in the carp fry is completely absorbed, and they must start feeding on external sources. Initially, they consume 2-3 small fish within two days, increasing to 4-5 fish over the next two to four days. By day five to eight, their appetite grows further, and they may consume 8-12 fish daily. As the squid continues to grow, so does their food requirement.
To ensure proper development, the bait fish should be provided in sufficient quantity. Before introducing the carp fry to the pond, it's recommended to first add bait fish with a total weight of 3-4 times that of the carp. Gradually increase the ratio to 1:10, and eventually feed 5% to 10% of the carp’s body weight in live fish, twice a day for two to three days.
If the fry do not open their eyes or fail to eat, they may swallow the bait without properly processing it. Therefore, careful monitoring is crucial during this phase. Bait fish should be managed carefully to avoid overcrowding or insufficient food supply. The squid has limited swimming ability and feeds based on its hunger. Once the mouth is open, they will consume whatever is available.
API
what is API?
High-purity plant monomer refers to one or more single chemical components with specific biological activity or pharmacological effects extracted from plants, and its purity is usually high, meaning that the content of the component in the extract reaches a certain percentage, and the content of other impurities or irrelevant components is low.
These plant monomers are usually secondary metabolites of plants, such as flavonoids (flavonoids), alkaloids (alkaloids), terpenoids (terpenoids), phenolics (phenolics), etc., which play a variety of physiological functions in plants such as defense, signal transduction, and antioxidant. Due to their pharmacological activity, high-purity plant monomers are often used in pharmaceuticals, health products, cosmetics and other biotechnology products.
For example, Naringenin is a high-purity plant monomer extracted from citrus plants with antioxidant and anti-inflammatory activities; Corosolic acid is a high-purity active monomer extracted from loquat leaves, which is considered to be effective in treating type 2 diabetes and obesity.
Extraction and preparation of high-purity plant monomers usually require a complex separation and purification process, including extraction, column chromatography, crystallization, recrystallization and other steps to ensure the purity and activity of the final product. These processes may be required by specialized biotechnology companies.
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