CATDOLL : CATDOLL: Yellow croaker tastes good, so why can it only be caught at night?

Hates strong light and likes turbid water. It floats at dawn, dusk or high tide, and floats to the bottom during the day or light tide. Main value: Large yellow croaker has high economic value, tender meat, and rich in protein. It is a good fresh food, not only can be sold, canned, but also processed into "melon seeds yellow croaker" and "yellow croaker", and can also be comprehensively utilized. The fish can be dried and made into the precious food "yellow croaker dried fish", and can also be made into yellow fish glue, which is the raw material of industrial high-grade glue. Large yellow croaker has certain medicinal value and is the raw material of some Chinese and Western patented medicines. The traditional Chinese medicine "fish glue beads" made by roasting the fish can treat digestive ulcers, kidney stones, etc. After studying the otoliths, it can be prepared with other traditional Chinese medicines to make "fish brain". Stone powder", which has a good therapeutic effect on sinusitis.

Additional information:

Regulations on physical and chemical factors of water environment:

1. The level of dissolved oxygen is an important factor in determining the growth of fish. The dissolved oxygen in the pool water is maintained at 5mg throughout the day. This is most conducive to the growth of various fish and the reproduction of microorganisms in the water, thereby enhancing the appetite of fish, and can convert harmful substances in the water into harmless substances, keeping the water fresh. The specific method is to turn on the aerator at the right time to circulate the pool water. In the case of high storage, the aerator must be turned on for 2 to 3 hours at noon to dissipate harmful gases in the water, dissolve in fresh oxygen and promote the growth of fish.

2. pH value also affects the growth of fish and other organisms. Adjusting pH value can prevent diseases and promote growth. Usually, quicklime is spread once every half a month, with a water depth of 1 meter per mu. 15-20 kg to stabilize the pH value of the pond water at 7.8-8.5.

3. In a fully-fed fish pond, after several months of breeding, the ammonia nitrogen and nitrite in the pond are usually high, which will affect the feeding and growth of fish and easily lead to fish poisoning and disease. Even death. Effective measures should be taken to adjust and control by adding aerators, increasing water exchange, adding special effect water conditioners, bottom quality conditioners or spraying zeolite powder (20-30kg per mu) to reduce ammonia nitrogen and nitrite in the water. Water, promote the reproduction and growth of beneficial organisms.

4. Regular use of photosynthetic bacteria, Bacillus subtilis, nitrifying bacteria, denitrifying bacteria and other microbial preparations can inhibit the reproduction of harmful algae and harmful microorganisms, promote the growth of beneficial algae, purify water bodies, and enhance the immunity of aquatic animals. Generally, the water temperature is 22~32℃. After diluting and activating with water, the entire pool should be evenly sprinkled before 10:00 in the morning on a sunny day. Do not sprinkle disinfectants 5-7 days before use and 5-7 days after use to avoid affecting the effect of microbial preparations.

Because of its living habits, it hates strong light, likes turbid environment, and tends to float up at dusk or high tide, and sink during the day or low tide, so it must be caught at night.

Yellow croaker must be caught at night because it contains a yellow pigment that will be decomposed by light. If it is caught during the day, the yellow croaker will lose its golden color and will not look good.

This is because the living habits of yellow croaker are to appear at night, and yellow croaker also chooses to appear at night to avoid being hunted by humans.