Study on culture technology of squid adult fish in reservoir cage

In recent years, the rapid development of the carp industry, the market demand continues to rise, the traditional pond raising carp cost is high, is not conducive to large-scale farming, while the cage is raising the use of large water bodies is a good ecological environment, combined with small cage Water-intensive farming measures to obtain a high-yielding farming method. Our company has experimented with cage culture of squid since 2000 and has achieved success. The cage culture technology is now summarized as follows:

First, materials and methods
1. Aquaculture waters The reservoirs used for our breeding are located at Jinhai Lake in Pinggu and Miyunsha Plant. It is a valley-type reservoir with clean and pollution-free water and an average water depth of 12m.
2. The structure and setting specifications of the cage are 5m5m and 4m4m. The net is a polyethylene structure. The size of the mesh depends on the specifications of the stocking species. It is based on the principle of not escaping fish and facilitating the exchange of water and the bottom mesh. The cage setting should select a place with a good water depth of 8m or more, and should also have conditions such as micro-flow, sheltering, sunny, and wide water. Large reservoirs should be equipped with suitable cove bays, and small reservoirs should be set not far from the dam.
3, seed stocking
Set the cages in mid-April, and the nets have no rough feeling after being soaked in the water, so as to reduce the chances of the fish species entering the box being frightened by the change of the environment, and thus being scratched by the nets. Restocking time is appropriate in mid-to-late April. The water temperature is about 10-15°C, which is the optimum growth temperature for squid. The larger the stocking specifications, the better, generally 75-150g per tail, and the stocking density is 40-50 tails/m2. Fish species are sterilized with 3% to 4% saline before entering the tank, and the difference between the transport water and the reservoir water temperature does not exceed 5°C. In 2002, our company stocked 150,000 and 5,000 fry in each of the cages of Jinhai Lake in Pinggu and Shachang Reservoir.
4. Feed and feeding The feed we use is artificially formulated pellets produced by ourselves. The content of protein is from 42% to 45%. The main raw materials are fishmeal, yeast, blood meal, wheat, corn, cocoon, etc. The stability of the pellets in water. To be high, keep it for more than half an hour.
After the fish species are put into the box, feeding should be stopped for 2 to 3 days so that the fish species can adapt to the environment. Feeding is started 2 to 3 days later, and feeding is required only a few times after the start of feeding. The bait particle size should be adjusted with the increase of the fish body in order to achieve palatability. Each morning, evening and evening, the squid has a night-time feeding habit and is fed once at night. The daily feeding amount is 2% to 4% of the fish weight in the box, and the feeding amount should be based on the weather water temperature and the fish’s feeding. It depends on the circumstances.
5, day-to-day management (1) have a guardian, adhere to early and middle night inspections.
(2) Check the feeding condition one hour after feeding each fish and adjust the amount of feeding; find that there are floating fish in the tank but also carry out the inspection and fishing. 缦淠诓∮闼 龊 龊 龊 Mei ≈ ≈ 〉 (3) Clean the cage every 10 days or so to remove debris and excessive algae attached to the mesh, keep the exchange of water inside and outside the tank open, and adjust the density as the fish grows.
(4) Change the cage every month, use the nesting method when replacing, ie, put the cage to be swapped in after 2 to 3 days of soaking and then put it in place to be replaced.愕耐渫饷妫?渫饷妫 9.9潭ê茫茫笠?⌒ oyster ?岩绲 浣 浣 ? ? ? 缢 妗 妗 鸦 鸦 鸦 鸦 鸦 绲 绲 绲 绲 绲 绲 绲 绲 绲 绲 绲 绲 富 富 富 富 富 富 富 富 富?BR> (5) Try to avoid pour fish in high temperature season so as to avoid loss.
6, fish disease prevention and treatment (1) before the cage water with lime or bleach soaked, 7 to 10 days in advance of the water, fish before entering the box with 3% to 4% of salt water soak 10 to 15 minutes, every other For 15 to 20 days, use 2 to 3 kg of quicklime per box, pour the water into the box and the nearby waters, once a day, for 3 consecutive days. At the same time, in the four corners of the cage, use bleaching powder and trichlorfon to intersperse the bags. Concentration of hanging bag).
(2) Raise the four corners of the cage when disinfecting, reduce the body of water, increase the concentration of the drug, observe the stress response, and wait until the clock is turned on. (3) The fish monster is found in the cage culture process. Hundred insects were immersed and disinfected, and the cage frame was hung with a trichlorfon medicine bag for 3 days, followed by soaking with a bactericidal agent and oral administration of the drug.

Second, the results after 4 months of cultivation on October 1 most fish to market specifications, the average weight of 0.8kg, the largest individual up to 1.5kg, the survival rate of 95%, bait coefficient of 1.5.

Third, summary and discussion
1. Cage farming in the northern region is a kind of farming method that can reduce the cost of breeding and improve economic efficiency, which is conducive to the development of the carp industry.
2. Factors influencing cage culture of eel (1) Temperature cage culture faces high temperatures in the summer, which affects the feeding. The maximum water temperature in July to August reaches 30 to 32°C. The high water temperature affects the growth of eels, and should be used when necessary. Reduce the amount of feeding.
(2) dissolved oxygen to reach 6mg/L. In general, ponds are prone to hypoxia due to small water exchange, but they also suffer from oxygen deficiency in the production process of reservoir cages. In the dry season, there is no supplement of water sources, water quality deteriorates, and in the summer nighttime, when the weather is hot and humid, oxygen deficiency is easily caused. It is necessary to set the aerator according to the actual situation.
(3) Diseases and reservoirs The reservoirs are faced with more pests and diseases, and daily disease prevention must be done.
(4) Whether or not the feed is suitable for puppies also affects the growth of catfish, and it is necessary to timely adjust the grain size of the feed.

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