First, the choice of water area

Should choose to set up cages in the deep reservoir bay of Xiangyang leeward, on the one hand, it can avoid netting when the cage is in the dry season, and on the other hand, the storm and waves at the deep reservoir bay are small, which can reduce the stress response of the fish school. It is not advisable to install cages in the upper reaches of the reservoir area where there are sources of pollution such as chemical fertilizer plants, pesticide plants, and paper mills, as well as in the waterways near waterways and docks.

Second, cage structure and installation

1. The cage is usually a 0.25/3x3 polyethylene nodule net with a mesh size of 3cm. The cage is 3m in length, 3m in width, and 3m in height. A square hexahedron-closed cage with a lid is used.

2. The cages are floating structures. Each cage is supported by four 3.5mx3.2m square buoys with a length of 3.5m and a tail diameter of 4.0cm or more. There are two ways to fix cages: one is anchorage rope fixation, that is, every 10 cages are a group, and two polyethylene cores of 2cm are ligated along the two sides of the cage in series. Each box is 1.0m, spacing of each row is 6.0m, each row of both ends is tensioned and fixed by anchor ropes. Each iron anchor weight is 10kg. The diameter of the anchor rope is 3cm. The length of the anchor rope should be greater than 2.5 times of the water depth. The second is the cable fixing method. The cable is a polyethylene rope with a diameter of 4cm. The cable crosses the water surface and is stretched and tightened. The two cables are separated by a distance of 3.5m and the distance between the two cables is 6m. The cages are fixed apart
Between two cables of 3.5m, the distance between each box is 3m.

3. The cages should be soaked in 1% bleach solution for a day and night, and the water should be installed one week before the fish species are put into the box. This will make the rough knotted nets become algae and become smooth afterwards. It is damaged by friction.

Third, the stocking of fry

1. Fry catching can be trapped using bamboo cages, shrimp hogs, or fixed nets, while gill nets and trapped fish are not available. What needs to be noticed is that there is still a fish in the reservoir called the "green shoot", which is commonly known as the "minibus knife" and "pask knife". It is also a genus of red, and its appearance is similar to that of the red beak. The difference: the red mouth is more than 70, only the dorsal and caudal fins are gray-black, the rest of the fins are gray-white; the red line of the red tip is below 70, and each fin is grayish black. The blue-green red individuals are small, and the largest individual is only 0.5 kg. Therefore, care should be taken when selecting the seed.

2. When the stocking density is 50g/tail, the stocking density is 30/m2 and 40/m2; when the fish size is above 100g/f, the stocking density is 20/m2 - 30 / square meter.

3. Disinfect the fingerlings with 10ppm KMnO4 solution to soak the fish body for 5min--10min, or soak the fish body with 3%--5% salt solution for 10min--15min. The specific bathing time should be flexible according to the water temperature and fish species at that time.

4. The fish species is selected from the red mouth? For ferocious fish, the specifications of each stocked fish should be basically the same. If the size of the fish is different, the differences in growth between individuals will be caused by differences in the ability to catch food. As a result, mutual disability appears, affecting the survival rate and yield. When the fish species enters the box, the individual differences will be divided into different categories for binning.

Fourth, feeding and management

1. The use of artificial compound feed in the form of feed and source cultivation is not satisfactory, and fresh live fish should be used, such as small freshwater fish and shrimp, chilled freshwater fish, etc. The Shuikou hydropower station reservoir area is rich in small-scale wild fish such as head fish, scallops, silver gutters, and goby, and it is generally operated by small screens and boats. The daily harvested volume is above 25kg and can reach up to 50kg. The farmers mainly deal with the source of feedstuffs by collecting and buying wild fish. If one day they are caught or bought too much, they can be refrigerated in a freezer. In the case of a small number of small-sized fish and shrimp, the small-sized trash fish can be stirred with a meat grinder and then mixed with artificial compound feed (40% fish meal, 30% soybean meal, 30% rice bran or wheat husk) at a ratio of 1:1. The proportion of mixed feeding. According to the characteristics of Alice's Red Platinum like to ingest insects, a black light can be installed in the cage area. In general, one (8W) per 4-6 cages is installed, and glass block screens are installed next to the lights to allow flies and moths. Mosquitoes, insects, etc., fall into the box after being hit by a plate, and are used to feed on the red mouth, to increase the natural animal food.

2. Feeding method In the initial stage of breeding, small fish, shrimp and fish can be stirred into fish gills and fed once a day from 8 a.m. to 9 a.m. daily. The daily feeding amount is 3% of the total body weight of the fish in the cage. After 1 month, the bait fish can be bred into palatable small fish and fed twice daily. The daily feeding amount can be increased to 5%--8% of the total fish body weight in the cage. The feeding amount must be flexibly supported according to the weather, water temperature, and fish feeding conditions.

The red mouth is used to hunt food in the middle and upper layers of the water body. Therefore, when feeding, the feeding speed should be slow, so that the feed can be evenly distributed on the water surface so that the fish can catch food in time and prevent the feed from sinking. Causes waste. When feeding, you can use splashing water or percussion on the sound of bamboo to attract the fish to feed. After two weeks of domestication, it forms a conditional reflex. Later, when fish is splashed or hit by bamboo, Can go up for grab food.

3. Water temperature regulation

The optimum growth water temperature is 25°C--28°C. When the water temperature is higher than 28°C, the fish's appetite decreases. In order to maintain a suitable water temperature, appropriate amounts of water hyacinth and other aquatic plants can be planted in cages, but the total area covered should be less than 30% of the area of ​​the cage.

V. Daily management

1. Check the cage for damage. There are many miscellaneous fish in the reservoir area of ​​the Shuikou Power Station, including large fierce fish such as largemouth bass and squid. In times of starvation, they often collide and attack the cage and cause damage to the cage. Therefore, they should be checked frequently and repaired in time.
2. The cage should be cleaned in time. Aphrodisiac Platinum has a higher requirement for dissolved oxygen in water than conventional fish. Therefore, cages should be flushed in time to prevent plugging of dead fish due to plugging.

VI. Disease Prevention

1. Bacterial gill rot disease every second month with chlorine dioxide 1ppm full box sprinkling 1 times, can play a preventive role; disease can be fed bait, 2 times a day, for 3 days - 5 days.

2. parasitic disease

Using the hanging bag method, select one corner for each cage, and hang the medicine bag 30cm below the water. Do not feed the drug at the hanging site to prevent fish poisoning accidentally entering the high-concentration area due to catching food.

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