Bream farming techniques

(i) Breeding of large-size bream species:
1. Pond conditions: Ponds for rearing catfish require a sandy bottom with less silt, an area of â€‹â€‹2-3 acres, a water depth of 1.5 meters or more, convenient irrigation and drainage, water quality that is light, not cloudy, no influx of sewage, and a small amount of fish ponds that are submerged in water. The new pool should be determined according to the soil quality. Acid pools and ponds with turbid water are not suitable for rearing catfish.
2. Pond preparation and feed fish cultivation:
(1) On April 5th, clear the pond with quick lime and piling up grass fertilizers in the four corners of the pond around April 10 (for example, if the bottom of the pond is good, do not fertilize) and add 0.8-1.0 meters of fresh water to cultivate water to cultivate feed. Natural fish food.
(2) Feed fish is generally carp seedlings. Around April 15th, fish nests (floats) with eggs of salmon are put into the pond for hatching, and the density of fry is generally controlled at about 500,000 per mu. The eggs can be placed in 2-3 batches, one batch at a time, such as 1-3-5. This can give consideration to the malnutrition of the seedlings that have different specifications.
(3) Use the method of controlling the amount of feed to prepare feed fish specifications. Generally, the fry stock with a specification of about 2 centimeters is stocked, and the feed fish specification can be controlled at about 1.2 centimeters.
3. Stocking and breeding of salmon fry:
(1) Put the eel seedlings into the previous day and add 10 centimeters of water (for example, water quality can be changed to 1/3).
(2) The stocking density of carp fry is 4000 fish/mu.
(3) Check the density of the feed fish in the pool and promptly supplement the feed fish.
(4) Pay attention to changes in water quality and weather conditions.
(5) Disease prevention and control:
It is mainly ciliates, such as oblique beetles and trichoderma, which have a low incidence of ringworms. See methods for prevention and control of adult fish culture.
(B) adult carp breeding:
1. Fish pond conditions:
The ponds for squid adult fish farming require sandy bottom, less silt (about 15 cm), area of â€‹â€‹3-8 mu, water depth of 1.5 meters or more, convenient drainage and irrigation, good water quality, no influx of sewage, and a small amount of sinks for sinking aquatic plants. A shallow ditch with a depth of 30-40 cm is also to be dug around the pool for the fishing of carp.
2. Pond Preparation and Feed Fish Culture:
(1) Use limed clear pond for disinfection 10-12 days before bait fish stocking.
(2) Natural bait cultivation: Add water to 60 cm before feed fry (carp, silver carp, squid, etc.) 7 days before stocking, and put about 150 kg of fertilized fertilizer per acre of water (but not apply fertilizer at the bottom of the pond) to develop wheels. Zooplankton such as worms and horns.
(3) Breeding of feed fish:
1 Feed Fish Variety and Stocking Density: Feed fish is generally white sea bass, squid, squid, etc., and the amount of mu fish is about 300,000.
2 Feed the fish into the previous day, add 10 centimeters of fresh water to make the water fresh and rich in natural food. After the fry is placed, it is not necessary to feed it immediately, but it is necessary to observe the density, body mass, growth rate and the number of red worms in the water every day until the number of red worms is reduced. When the fry is foraging around the pond, it immediately uses a thick slurry to â€œspout the beachâ€. , and several times a day to check the situation of each feeding point, eat in the early feed to add Tim, in the later control feed fish specifications to be controlled. General stocks of 8-10 cm of salmon are stocked, and feed fish specifications should be controlled at about 3-4 cm.
3 Forage fish can also be put into some old loach, and the small loach that is produced can be used as a high-quality bait for trout.
4 The proportion of cod farming area and feed pond area is generally 1:3-4.
3. Stocking of carp species:
(1) Before stocking puffer fish, drain half of the pool water and then fill it with fresh water to make the pool water slightly lean. Later, the water depth is gradually added to more than 1.5 meters.
(2) Stocking Density: About 800 Acres are placed.
4. Feeding management:
(1) feed feeding:
1 feed fish can choose carp, carp, carp, grass carp and so on.
2 feeding technology:
a. Feed supplement fish on a regular basis (1 to 3 days).
b. Judging the amount of feed fish in the pond:
When there is enough feed fish in the pond, the carp catches the bait fish at the bottom of the water, so the surface of the pond is only small and small. When listening, the sound of water produced by fish catching feed fish is small, and the time interval is large. If there is a shortage of feed fish in the pool, the carp feeds the feed fish to the water layer, so the water spray is large, the sound emitted is frequent, and the sound is loud. If you see a group of squid hunting for fish at the edge of the pool, it means that the feed fish in the pool have basically finished eating.
c. Palatability of feed fish:
The size of the palatability feed fish is generally about 1/3 of the length of the carp, and if the feed fish has a non-uniform size, the fish feed must be sieved to remove the large-size feed fish.
(2) Water Quality Management:
1 The water quality of fish ponds must be kept at a standard of â€œfat, live, and coolâ€ all year round, and the transparency of the pool water should be maintained at about 30 cm. Always add new water, especially during the high-temperature period from June to September, add water every 5-7 days, and add 15-20 cm of water each time. If you use drugs more than once, you need to change the water to prevent phytotoxicity.
2 If the weather is abnormal, add water immediately and keep the water level of the fish pond relatively stable. This provides good environmental conditions for the growth of carp. If the water is turbid, use 1 kg of alum per acre or quicklime of 5-7.5 kg of water to splash it at Quanchipu.
3 Install an aerator to prevent the catfish from lacking oxygen and float the head. Normally, the oxygen is turned on at noon in sunny or less cloudy weather. If the weather is hot, it is switched on from midnight to early morning.
4Prepare some hydrogen peroxide (above 30% content) or aeration spirit, which can be used for rescue when the squid floats its head. Hydrogen peroxide usage: Use 250 ml of hydrogen peroxide per acre, add 500 ml of water, and add 2% of ferrous sulfate 3-5 ml. Oxygen use see instructions.
5. Fish Disease Control:
(1) Ciliate disease: mainly parasitized on the body surface, fins, and ankles of salmon, and parasitism species are mainly trichomonads and slug. The disease spread rapidly. When the number of parasites is small, it has little effect on the fish's activity. When there is a large number of parasites, the fish will not eat. The gray-white spots on the fish body are visible to the naked eye and the swimming loses its balance and then dies.
Control methods: Formaldehyde 20PPM watered Quanchiposa. The effect of copper sulfate on the oblique worms is not ideal and has a certain effect on worms. The fish killer in Shanghai has a significant curative effect on the oblique tubeworm.
(2) Anchor head disease: The part of the fish body that is penetrated by the head of the iron annelid, its surrounding tissues are often inflammatory and reddened, followed by tissue necrosis.
Control methods:
1Each acre per metre of water depth uses "strongly exterminator" (Beijing Xinyang) or "enemy fish worm" (Shanxi Fish and shrimp Group) full of water in the whole pool (squid is sensitive to trichlorfon and controls fish Disable crystal trichlorfon when sick.
2 If there is an anchor on the fish body of the bait fish, 20PPM "potassium permanganate" solution can be used to bath for 15 minutes and then fed.
(3) Fish larvae: The body of the fish is attached to the worm-like worm body, and the squid's food intake is reduced. The body is wasted and growth stops.
Control methods: with the anchor head.
(4) Cylindrotheca sinensis: The parasitoid is parasitized in the stern of the fish, the body of the diseased fish is thin, and the body color is dark. It occurs in both summer flowering and adult fish stages, and the mortality rate is high.
Control methods: Use "Wu Xi" "killer king" or Beijing produced "fish worm comet II", use instructions.
(5) Bacterial rotting: Every metre of water per acre uses "strong chlorine" 0.27 kilograms or "buoy flour fine" 0.33 kilograms of water. At the same time take medicine baits 7-10 days.
(6) Hemorrhagic disease: In the adult fish breeding stage, pathogens are often brought in by feed fish. After the feed fish suffering from bacterial diseases are eaten by carp, symptoms such as surface inflammation, liver and kidney carriers, and ascites often appear. treatment method:
1 Use "strong chlorine" 0.4PPM (or use "floating powder essence", dibromohydantoin, bromochloroheine, etc.) Such as long-term use of drugs without changing the pool, you must first change the water and then medication to prevent phytotoxicity.
2 Use é³œé±¼ ä¸“ç”¨ ã€Œ é³œ è¡€ å® NING ã€, you can add 12.5 kg of feed per bag. The bait production method is as follows:
a. Use 50% wheat flour, 50% cake, mix well;
b. Preparation method of bait: Weigh a certain amount of water according to 65% of the amount of feed, and then add the drug according to the amount of feed. After the drug is dissolved into a syrup, mix it in the feed, and then put it into the feed by hand or step with the foot for one hour. After feeding to the feed fish in the carp pond (usually required to feed around 4 pm, because the carp is the most fierce predator in the evening, the feed fish swallows the bait and is just swallowed by the carp).
b. The number of days the bait is fed depends on the condition of the carp, usually 5-10 days.
d. Note: After changing the water, disinfect with a sterilized drug once. At the same time, the bait fish should be put before feeding the bait, and the bait should be fed at about 6% of the bait fish weight.