Pond raising fish technology

Pond raising fish technology

(1) Pond conditions and preparation work The pond area is suitable for 3300m2-6600m2, water depth is more than 2m, water source is sufficient, water quality is not polluted, and there is good access to drainage facilities and convenient transportation. Before restocking, the dry pool should be dredged and leveled to protect the slope. The quicklime should be used between 750kg and 1050kg per hectare to keep the water in the pool at 10-20cm and soaked with spatter. After 7 days, add water to 1m deep. In order to maintain the water quality, diammonium 75kg/hm2 can be applied once. After two days, the pool water becomes oil green and can be stocked.

(2) Holding and stocking of fingerlings

The eel fry are mostly sea-catching. The spring-sea catches are about 2.5cm-4cm. The fish will have different degrees of injury after being caught and transported. In order to increase the survival rate of the culture, intermediate stocking may be carried out first. It is more convenient to set up a 40-mesh cage in the rearing tank. 2000-3000 tails were raised per cubic meter of water body, and they were disinfected with 110-6-210-6 chloramphenicol, and the post-fish furazolidone was consumed. The first 10 days of feeding Artemia larvae or marine freshwater horns, copepods, and then fed fresh fish. The fish species are cultured to about 10 cm and put into a pool at 1.5 tails/m2.

(3) Development Management

A, feeding

The bait is mainly low-grade miscellaneous fish, supplemented by artificial ingredients. The squid grabs fast and has a large content. It is very important to ration regularly. When feeding, it is necessary to grasp the fullness of the fish without wasting food. Each time the first feeding of the fish is increased, the feeding amount is increased when the fish is first raised and the fish is fed up. When the fish sinks, the feed is stopped when the food is not caught. The daily feeding amount and the feeding amount vary depending on the season. The optimum temperature for the rapid growth of carp is 4-5 times daily, and the amount of bait is 10-30% of the fish's body weight. Early spring and late autumn at low temperature, and 2-3 times daily feeding, accounting for 1-10% of fish's body weight. .

B, patrol pond inspection

Observe the observation of the ponds sooner or later and find that the abnormalities are handled in time. The observations of the patrol pond include the activities of the fish body, the changes in pond water color, odor, transparency, pond escape prevention facilities and predators.

Cage culture

(1) Conditions for aquaculture sea areas

The ventilation is required to maintain a water depth of 5m or more at low tide. The water flow is unobstructed and 0.3m per second is suitable. The bottoms are free from obstructions, the water quality is fresh and pollution-free, and the salinity changes little.

(2) cage structure

Raft cages, cages, fixed and mesh sandbags. The fixed type is made of a metal pipe which is slightly larger than the frame of the cage, and the cage is fixed in its inner shape. The sandbag type is to hang a 4kg sandbag at each corner of the cage body to fix the mesh type. In the South, wooden planks are used to make qualified fish fillets. They are floated on the surface of the water and anchored by anchor cables. The cages are hung in the fish row. In the north, there are many single-floating single-floating frames, and the floating cages are connected to floating ropes in the sea area. The size of the net mouth is usually 33m and 44m. The net depth is determined by the water depth of the sea area at any time. Usually 4-6m, the net size depends on the size of the fish. The mesh principle is used to break one head without escaping the fish. The mesh should be smaller than the mesh size. The body height is 1/2.

(3) Fish stocking

When the carp develops a commercial fish, its seedlings should be raised to more than 10cm and then counted into a cage. The number of water bodies per cubic meter of cage is 20-30. The specific stocking densities should be determined according to the specifications of the fish species, the condition of the sea in the seasons in the season, the stocking of the bait, and the breeding technique.

(4) Feeding

The bait is mainly based on low-value miscellaneous fish, and can also be fed with grain feed. Each feeding should be less after first, and the feeding amount of fish should be increased after feeding and feeding, and the daily feeding amount is not wasted. Prevail, when the fish do not catch feed, they should stop feeding. The number of feedings is 4-5 times a day. When the early spring and late autumn and winter water temperature is low, a daily shot is made 2-3 times.

(5) Daily management

The network element is often washed to remove attachments, usually 10-15 days. If necessary, replace the new cage, check the cages, and prevent leakage. Pay attention to fish, water conditions and diseases.

Disease prevention and treatment

(1) Ocular white candle

[Symptoms] are more common in spring and summer fish species. White spots appeared in the eyeballs, which gradually enlarged and covered the entire eyeball. Severe eyes protruded and fell off. The disease can be caused by the lack of fresh food and vitamin deficiency.

[Prevention and Control] Renew aquaculture water, feed fresh food, and add vitamins (especially VB) to food.

(2) Sphaerothecosis

[Symptoms] Flocculate bacteria appear in the fish. The diseased fish swim slowly on the water. Loss of appetite and weight loss result in infection.

[Prevention] Replace with fresh water and maintain good water quality. Dissolve MG of 610-6 in malachite green for 5-10 minutes.

(3) skin ulcer disease

[Symptoms] More common in hot seasons. Local fish descale, congestive ulceration. Mostly caused by bacterial infection caused by fish injuries, sick fish loss of appetite, floating slow swim, weight loss and death.

[Control] with 2010-6 plus chloramphenicol (or nitrofurazone) bath 4h-5h.

(4) Enteritis

[Symptoms] Swelling of the diseased fish, anal swelling, yellow mucus outflow, fish weight loss, loss of appetite, severe death. It is caused by the deterioration of the bait and the high fat content of the bait.

[Control] Furazolidone baits were formulated in an amount of 0.1% and fed continuously for 5-7 days.

(5) Fish caries

[Symptoms] The fish parasites are paralyzed and the sick fish are disturbed by swimming. They rely on friction on the pool wall, and the weight of the fish body is heavy.

[Prevention and control] with crystals trichlorfon Quanchiposa, so that the pool of water containing 0.2510-6-0.310-6, every 3 days and then apply once, usually twice the medication can be cured, can also be used pure fresh water bath 2-3 In minutes, the fish can also fall off on its own.

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