If the body color remains the same, you can bathe with norfloxacin. 100 liter of water 4~6 capsules. After 3~6 days of medicated bath, stop taking medicine and change water when abdominal distension disappears. Fasting is required during the medicated bath. As the fin contracts, the body color turns black.
The rotten tail can be treated with oxytetracycline, copper sulfate and salt first, or norfloxacin can be added at the same time. The best way is to use soil mold while the fish is still edible.
Mix vegetarian food or norfloxacin into hamburgers and feed them, and the effect will be faster. Take it once a day for three days. Or stop taking medicine when you see purulent white stool. The dosage is one tablet per kilogram of hamburger.
Koi fish introduced.
Vertebrates that live in water all their lives breathe through gills and swim with fins. Fish include three categories, namely amphipoda, cartilaginous fish and bony fish. There are about 26,000 known fish species in the world, which is the largest group of vertebrates, accounting for 48. 1% of the total number of vertebrates. Most of them live in the ocean.
There are about 8600 species of freshwater fish, and there are nearly 3000 species of fish in China, including about 1000 species of freshwater fish. Fish have good hearing. Scientists have found that although many fish do not have long ears outside, they have specially designed sound receivers that can transmit sound waves to the tubular structure filled with liquid in the inner ear. There are special fine hairs in these pipes.
They are called cilia, which can transmit sound pulses to the fish brain through a series of complex mechanisms and chemical reactions, and process them there. Otolith is a part of the auditory system, which is connected with sensory cells and plays an important role in the hearing/balance mechanism of teleost. Otoliths are of great value to scientists.
They rely on otoliths to distinguish the species of fish, and they can also judge the age of a fish, because when the fish grows up, otoliths grow concentric circles every year. Under the microscope, scientists can see and count these concentric circles.