Matters needing attention in raising mandarin fish in autumn

Autumn approaching, mandarin fish farmers should pay attention to, so autumn mandarin fish what precautions? Let's introduce it to you below.

Improve the water quality of the pond. In autumn, the feed intake of mandarin fish increases, and more waste is produced every day, which easily leads to excessive content of harmful substances such as ammonia nitrogen and nitrite in the water. Therefore, the water should be changed frequently, once every 7 days, and the water volume changed every time is about 20 cm.

Every 5 mu ~6 mu mandarin fish pond area is equipped with a 3kW aerator, which can be operated for 2 hours ~3 hours at noon on sunny days, which can mix the upper and lower water layers, eliminate oxygen debt and increase the dissolved oxygen storage of fish pond. Turn on the aerator around 12:00 p.m. until dawn. In case of shower or sultry weather, start the aerator in advance at night, and at the same time, it is equipped with particle oxygen full pool sprinkling.

Strengthen fish physique master reasonable breeding density and scientific polyculture, stocking density of about 850 fish per mu.

The feeding amount of each bait fish is 2 ~3 times of the daily feed intake of mandarin fish, and it is added once every 2 ~3 days to prevent mandarin fish from overeating and overgrowth.

Disease prevention and control: Disinfect and deworm the bait fish planned to be caught 3 to 5 days in advance, feed the bait for 3 to 5 days if necessary, and then catch and put them into the mandarin fish pond after ensuring the health of the bait fish.

Autumn is the season of high occurrence of T. sinensis and T. inclinata when the optimum reproduction temperature is reached with the decrease of water temperature. T. inclinata and T. Stimulation and destruction of gill filaments, fins and body surface cause a large amount of mucus secretion of sick fish, so that the surface of skin and gill is pale or a layer of light gray film is formed on the surface of skin. In severe cases, sick fish float on the water surface, have difficulty breathing, and the gill cover is golden red. Soon, they die, and the mortality rate is as high as 90%. To this end, to achieve prevention and treatment simultaneously, attention should be paid to the following points: 1, medication, should ensure that the water quality fresh, dissolved oxygen sufficient.

2. Sprinkle the mandarin fish pond once a day with 2% saline or copper sulfate and potassium permanganate mixture (5:2) to make the pond water have a concentration of 0.3~0.4 g/m3.

3. When the disease is serious, the fish body can be immersed in 10 mg/L formaldehyde or 20 mg/L new germicidal disinfectant for 10 minutes, or 3-5% saline for 5-10 minutes, once a day.

4. Sprinkle copper sulfate and ferrous sulfate mixture (5:2) in the whole pool to make the pool water have a concentration of 0.7 g/m3. Water application 1.2-1.4 g/m3 concentration (specific according to the bearing degree of mandarin fish), once a day. Consecutive twice

5, with 20 mg/L formalin whole pool splash, better than with copper sulfate and ferrous sulfate effect.