What are the technical points of mixed culture of catfish and soft-shelled turtle?

The experiment of mixed culture of hybrid catfish and soft-shelled turtle in Qiuying soil turtle farm in Henghe Town, Boluo County was initially successful, with a profit of 11,39 yuan per mu. Now I will summarize the polyculture technology of catfish and soft-shelled turtle as follows for the reference of qualified and interested farmers.

mixed culture technology of catfish and soft-shelled turtle: fish species preparation

1. Hybrid catfish is a hybrid of Silurus asotus as the male parent and Silurus asotus as the female parent. It not only has the characteristics of body color, markings, taste and meat quality similar to that of Silurus asotus, but also has the advantage of fast growth of Silurus asotus. The Chinese soft-shelled turtle for polyculture is mainly cultivated by the farm itself, and some of it is purchased from abroad.

2. Selection criteria of fish species: the fish body is fat, the specifications are consistent, there is no injury or disease, and the surface color is bright and bright.

3. Fish stocking and disinfection: See the attached table for the species and quantity of fish stocking. Before the fingerlings enter the pond, they should be disinfected. Generally, they should be soaked in 3% salt water for 5-1 minutes.

polyculture technology of catfish and soft-shelled turtle: pond conditions

1. There are 9 experimental ponds with an area ranging from 3 to 15 mu, with a total water surface area of ***8 mu. The water intake and drainage of the pond are convenient, the water source is sufficient, and the water quality, air and soil all meet the requirements of pollution-free culture.

2. The water depth of the pond is 1.5 ~ 2m, and fish-blocking facilities are installed at the inlet and outlet, and the pond embankment is surrounded by 1× 1m cement precast slabs to prevent the Trionyx sinensis from escaping.

mixed culture technology of catfish and soft-shelled turtle: supporting facilities

The farm has a small freezer for storing small miscellaneous fish or chilled fish, and is equipped with chilled meat grinder, chilled granulator and water pump, and each fish pond is equipped with 1~2 aerators.

mixed culture technology of catfish and soft-shelled turtle: feeding management

1. pond cleaning and disinfection: all ponds are disinfected with quicklime first, and water is injected into the pond about 15 days before the fish go into the pond, so that the water depth of the pond is about 1 meter.

2. Standard-thick cultivation of fish species: In order to facilitate the cultivation management and ensure the survival rate, the hybrid catfish was first cultivated in a small pond with a standard thickness of .1kg/tail, and then cultured in a pond.

3. Daily management

① Feed source: on the premise of convenience, sufficiency and economy, it mainly uses small tilapia and low-value wild fish, with a small amount of snails or frozen seafood as supplements.

(2) After the fish species go into the pond, before the hybrid catfish individuals reach .25 kg/tail, the feed is mainly mixed with a small amount of eel feed after the small tilapia is ground with a chilled meat grinder. When more than half of the hybrid catfish individuals reach .25 kg/tail, they are directly fed with small miscellaneous fish cut into small pieces. From May to October, feed the catfish twice a day, once in the morning and once in the evening, feed less in the morning and more in the evening, and the daily feeding amount is 5%~1% of the total weight of the hybrid catfish; In other months, depending on the water temperature and weather conditions, it is basically fed once a day, and the daily feeding amount is 2%~5% of the total weight of hybrid catfish. The feeding amount for each time shall be based on the fact that the hybrid catfish is finished in about 1 hour, and the rotten feed shall not be fed.

③ During the cultivation process, inject 2cm of water into the pond every 2 days or so until the water depth of the pond reaches more than 1.5 meters; At the peak of growth, the pond is flushed once every 15 days, and then flushed, with a flushing time of 2~3cm.

④ pay attention to adjusting the water quality, so as to keep the cultured water body fat, lively, tender and cool all the time, and keep the transparency of the water body between 25 and 35 cm. According to the water quality, microbial agents such as photosynthetic bacteria are used irregularly to adjust the water quality. Since May, the water quality has been measured twice a month, mainly measuring the PH value, ammonia nitrogen, nitrite, etc. of the aquaculture water. Once ammonia nitrogen or nitrite is found to exceed the standard, it will be treated with corresponding drugs. Patrol the pond every morning, noon and evening, observe the feeding and activities of catfish, and check the inlet and outlet of the pond and the wall made of cement board. According to the weather and fish activities, start the aerator to increase oxygen.

4. Fishing

After the hybrid catfish grows to the size of .65kg/ tail, it begins to catch and go on the market. The fishing method of hybrid catfish is relatively simple, mainly by purse seine, and the catching rate is over 9%. See the attached table for the specific harvest.

mixed culture technology of catfish and soft-shelled turtle: prevention and treatment of fish diseases

Since the beginning of the experiment, no major fish diseases have occurred, and the main prevention and control measures are to feed allicin bait every 2 days during the peak growth period.