Site selection water temperature: constant water temperature 15 °C ~ 28 °C.
Site selection water flow: flow is the key to limit the level of aquaculture yield. The lowest flow rate at the site selection should be 0.05 cubic meters per second or more. After the aquaculture pond is built, the minimum water exchange volume in the pool can reach 1 hour per hour. ~ 3 times, the exchange of water in the pond during the rearing period depends on the water temperature, stocking density, etc. The exchange rate of the pond water is required to be 2.5 to 4 times per hour.
Site selection water quality: fresh water, no pollution, adequate dissolved oxygen, survival of shrimp, crabs, frogs, fish and other "indicate aquatic animals."
Location Site Transportation: Convenient transportation, no more than 500 meters from the road.
Fish pond construction
Pool shape: rectangular, round blunt, round pool, round, more round, round and round, nearly circular pool is better, in order to exchange pool water without dead ends, reasonable water, fish can be in full The pool is evenly distributed.
Chi Shen: The depth of the fish pond is 1.8 meters to 2 meters, and the water depth is 1.5 meters to 1.8 meters. The depth of the flow tank for breeding large-sized squid is more than 2 meters.
Area: Rectangular pool and four-cornered circular pool The recommended size is 4 to 8 meters in fish pond width, 8 to 15 meters in length, and 8.7 to 10 meters in diameter in circular pools, with an area of ​​60 to 120 square meters.
Inlet: The four-cornered circular blunt pool, circular pool, and the inlet pipe of the approximate circular pool are inclined at an angle of about 40 degrees to the pool wall and flush into the pool, enabling the pool water to be turned in a directed manner so that the fish's bait and feces can be removed. The centripetal force formed by the flow of water through the flow of water is continuously collected to the center and discharged from the fish pond. The width of the inlet of the rectangular pool is preferably close to the width of the inlet side wall so that the water in the pool can be exchanged without leaving a dead angle.
Drain outlets: Drain outlets with round blunt pools, round pools, and approximately circular pools are located at the center bottom of the pool. The bottom of the pool must have a certain gradient from the pool wall to the drain outlet. The drain outlet of the rectangular fish pond Located on the opposite side of the water inlet, the bottom of the pool must have a certain slope from the inlet to the outlet. The width of the outlet should also be close to the width of the drainage pool, so that the water in the pool can be exchanged without leaving a dead angle.
Water level control facilities: four-corner circular blunt pool, round pool, approximately circular pool, with plug-type drainage section doors or casing-type drainage section doors, rectangular fish pond water level control gates.
Material and fish pond surface treatment: cement, stone, red brick, etc. are used for the construction of the fish pond, the cement at the bottom of the pond is hardened, and the cement on the wall of the pond is smoothed and calendered.
Barrier: Regardless of the shape of the fish pond, the drain should be provided with a layer of barrage, the bar of the rectangular pool is a bar-shaped grille at the drain, round blunt, round pool, approximately circular in the drain hole. It is a hood. When the species size is small, the barrage should be covered with a dense screen.
Spill: Set an overflow port with a size enough to block the fish cage at a position 15 cm to 20 cm away from the top of the pool to prevent fish from running out of the pond.
Alkaline treatment of newly built fish ponds: New fish ponds need to be soaked and rinsed with water for more than one week to eliminate cement alkalinity and to avoid dead fish species.
Stocking
Density: The stocking density of cold water fish depends on the exchange volume of the water body and the size of the fish species. The stocking density of 100g to 250g/tail bream is 30 to 100/m2, and the stocking density is 10kg to 14kg by weight. /Cm3, above 16 kg/m3, metabolites produced by fish metabolism will increase the hydration index of H2S, ammonia nitrogen, nitrate nitrogen, and nitrite nitrogen, and the fish will feel physical discomfort. Only normal feeding activities can be guaranteed, and the fish will grow slowly, and the ability to resist disease will be reduced.
Water temperature regulation at the time of delivery: After the oxygen bags are transported, after the fish species reach their destination, open the foam box and place the oxygen bag in the fish pond for about 40 minutes (blocking the sun-irradiated oxygen bag) so that the water temperature in the bag is close to the water temperature of the pool water. The temperature difference between inside and outside is below 2°C, open the oxygen bag, slowly add water from the fish pond to the full oxygen bag, balance the water temperature in the bag and the pool, and then gradually add the fish into the fish pond.
Disinfection of fish: When the fish is in the pool or in the sub-pool, soak the fish with 2% to 3% of salt water for 15 minutes to 30 minutes.
Fish transportation
Stalling: Fish species generally have to stop for 1 day to 3 days before transportation.
Transportation method: In the summer, a small amount of fish is transported by oxygen bag plus ice cooling, oxygenation, and foam box heat preservation transportation. Two bottles of frozen mineral water are placed in the foam box, and the foam box is sealed and transported with a wide tape. Most species of fish are best transported using containers for cooling and oxygenation, preferably in the evening or early morning.
Feeding
Feed quality: Feed full price (full nutrition) high quality pellet feed. The feed is best stored in a dry and non-humid environment at a temperature of 10°C to 20°C. Each time the bag is taken, the bag should be tightly closed to prevent moisture absorption and mildew, and the feed should not be sun exposed to prevent nutrients from falling.
Feeding amount: Under appropriate conditions, the daily bait rate of fish species is about 3%, and adult fish is about 2.5%. According to the fish's food intake after each feeding, as well as the water temperature, fish status, dissolved oxygen and other factors, scientifically and reasonably adjust the feeding amount. The amount of feed each time, it is best to eat within 15 minutes, up to no more than 20 minutes, minimum of not less than 5 minutes. Only 20 minutes before eating, to reduce the amount of food to be eaten in 5 minutes, to increase.
The palatability of the feed: and should pay attention to the bait particle size and the fish body size to adapt to, the average bait particle size of the feed fish mouth split 2 / 3 is better.
Slow water feeding: When feeding, reduce the water exchange, so that the water in the pool is in a microfluidic state.
The whole pond spreads: Can't concentrate on a little feed, spread all over the pool, to prevent the fish in the pond from feeding unevenly, and eat less fish is not long.
Feeding experience of carp: reference to 25 grams of the following seedlings feeding powdered material, the daily feeding rate of 5%, divided into 6 feeding; 25 grams to 50 grams of seed feeding particle size of 1 mm to 2 mm Granules, daily feeding rate of 3%, divided into 4 feeding; 50 grams to 250 grams of seedlings were fed particle size of 2 mm to 3 mm of granular materials, daily feeding rate of 2%, divided into 4 feeding; 250g-500g are fed with granules with a particle size of 4mm-5mm. The daily feeding rate is 1.5%, which is fed in 3 times; 500-1000g is fed with granules with a particle size of 5-6mm. The daily feeding rate was 1.0%, which was divided into 2 to 3 feedings. The pellets with a particle size of 6 to 11 mm were fed over 1000 grams. The daily feeding rate was 0.2% to 0.8%, which was fed in two feedings.
management
Clean the bottom of the tank regularly: Clean the bottom of the tank once a week to prevent the accumulation of residual baits, feces, defoliants, etc., and the breeding of algae bacteria. When sewage is discharged, lower the pool water to 1/2 or 1/3 or so, and increase the discharge rate of the pool water. Sweep cleanly while discharging. Make every effort to discharge the waste in the pool and remove the sick fish and dead fish in time.
Oxygenation: When the water source is insufficient and the water temperature of the pool is high, the oxygen can be used to increase the dissolved oxygen in the water.
Water quantity and water level control: When the size of the fish species to be put in is small, the water flow rate must be small. With the increase of the fish body, the flow rate is gradually increased. From 10 cm fry to 1 kg commercial fish, the water level should be gradually increased from 50 cm to 150 cm.
Water temperature control: It is best to maintain the water temperature in the pool between 18 °C ~ 24 °C, the maximum water temperature should not exceed 28 °C.
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