Water quality requirements of cultured yellow croaker, with culture methods.

Yellow croaker has high requirements on water quality, including water transparency of 35cm, PH value of water body o

Water quality requirements of cultured yellow croaker, with culture methods.

Yellow croaker has high requirements on water quality, including water transparency of 35cm, PH value of water body of 7-8.5, oxygen in water body and water temperature of 25-28℃. In water quality management, it is necessary to start the aerator regularly to ensure that there is enough dissolved oxygen in the water, and inject water 1 time every month from May to June, with 30 cm of fresh water each time. After 6-9 months, change the water every half month 1 time, each time about 15cm, and keep the water depth at 1.2-.

I. Water quality requirements for feeding yellow croaker

1, water quality requirements

(1) requires clean water quality, and the transparency is generally above 35cm. Generally, a water body with running water all the year round is appropriate.

(2) The water quality is generally alkaline, and the suitable PH value is 7-8.5.

(3) The water temperature generally needs to be 25-28℃, and the water also needs to have a certain oxygen content.

2. Water quality management methods

(1) Water injection1time every month from May to June, with fresh water of 30cm each time.

(2) Generally, from June to September, the water is changed every half month 1 time, and the water can be changed about 15cm each time, so as to keep the water depth at1.2-1.5 m. ..

(3) In order to increase the dissolved oxygen in the water, it is necessary to turn on the aerator regularly to ensure that there is enough oxygen in the water for the life of the yellow croaker.

Second, the cultivation method of yellow croaker

1, processing pool

(1) requires the bottom of the pond to be flat, and the thickness of silt at the bottom should be controlled at about 10cm.

(2) Before throwing fry, drain the water in the pond, evenly sprinkle quicklime 150kg/ mu, and then evenly mix lime and bottom mud.

(3) After about 7- 10 days, inject 80cm of fresh water, put in small fish to test the water, and deepen the water level of the pond to more than 2m after confirming safety.

Step 2 put in the fry

(1) can be released in late April when the water temperature is stable at around 10℃. It should be noted that the fish should be bathed in 5% salt solution for about 10- 15 minutes before being released.

(2) For fry with the specification of 15-35g/ fish, generally, 2,500-5,000 fish can be put in per mu. If the specifications are relatively large, the quantity can be appropriately reduced, and at the same time, 200 silver carp and bighead carp can be combined.

3. Feeding management

(1) Yellow croaker has high requirements on feed, with protein content of 35-45% and crude fat content of 5-8%.

(2) The formula of artificial compound feed is usually 30-40% of fish meal, 20-30% of bean cake, 0/0-35% of vegetable cake, 0/5-18% of secondary flour and 0/0-/kloc-0 of rice bran.

(3) When feeding, it should be positioned, timed, guaranteed in quality and quantity, and the daily feeding amount should be flexibly adjusted according to factors such as water temperature, weather and fry specifications.

4. Daily management

(1) It is usually necessary to start the aerator for aeration 1 hour in the early morning and after noon on sunny days. In case of bad weather such as rain, thunder and sultry weather, it is necessary to start the aerator in advance to aerate and keep the dissolved oxygen in the water above 3 mg/L.

(2) Observe the feeding, activity and growth of fish schools, and timely symptomatic treatment is needed after finding abnormalities.