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Prevention and Treatment Methods for Several Gill Diseases in Whiteleg Shrimp (Litopenaeus vannamei) Farming
1. Gill disease caused by Vibrio. Diseased shrimp float and swim slowly on the water surface, with gill filaments slightly swollen and dark gray, showing degeneration and necrosis at the tips. Under high magnification, actively motile bacterial cells can be seen. Ponds where this disease occurs have severely polluted bottom sediment and poor water quality, and the disease peak season is from July to September.
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Overwintering techniques for freshwater pomfret fry
The freshwater pomfret (Piaractus brachypomus) is a freshwater aquaculture fish species introduced to mainland China for farming in the 1980s. Because of its good meat quality, fast growth, ease of extensive rearing and large market demand, it is deeply favored by the vast number of farmers. However, since the freshwater pomfret is a warm-water fish, its optimal growth
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Experience in the sources and selection of broodstock for freshwater pomfret (pirapitinga) farming
Freshwater pomfret has a strong reproductive capacity. When selecting broodstock, choose individuals that are large, fast-growing, free of any disease or injury, with smooth body surface and clearly defined coloration. Also avoid using fish that are closely related as broodstock, so as to prevent degeneration of the offspring and its effect on growth.
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Precautions for Nursing Freshwater Piranha (Piaractus brachypomus) Fry: What Key Points Must Farmers Master?
Freshwater piranha (Piaractus brachypomus) is an omnivorous fish; the young fish (fry) mainly feed on large zooplankton, and also consume organic debris and various artificial feeds. The following precautions should be noted during the fry nursing stage: I. Dedicated pond nursing. Because freshwater piranha is omnivorous, grows fast, has few diseases,
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Introduction to compound feed for freshwater pomfret farming
Freshwater pomfret (Piaractus brachypomus) is a feeding fish, and in intensive farming such as ponds, cages and flowing water where freshwater pomfret is the main species, compound feed is used for feeding. This is also an important measure to increase output, promote growth and shorten the farming cycle. Practice has proved that using compound feed
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How can freshwater pomfret be farmed for rapid grow-out?
From May to November 2009, 5 recreational fishing farms in Yuetang District, Xiangtan, adopted the 80:20 high-efficiency adult fish pond farming model for freshwater pomfret, that is, in pond farming the main cultured species is freshwater pomfret (a feeding fish) at 80%, with accompanying fish (filter-feeding fish) at 20%, mainly feeding a complete extruded pellet feed.
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What preparations are needed before raising adult freshwater pomfret?
I. Pond conditions The pond area for raising adult freshwater pomfret should preferably be 10-20 mu, with a water depth of about 1.8 m. The pond is required to have an adequate water source, fresh and pollution-free water quality, convenient water intake and drainage, a flat pond bottom and little silt. II. Pond clearing and disinfection At the end of the year, drain the pond and expose it to the sun, remove excess
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Sharing Daily Management Experience in Freshwater Pompano Farming
1. Bait varieties One type is directly fed with Northeast soybeans. The other type is fed with pellet feed, with a protein content of more than 32%; the later-stage feed should increase the fat content. 2. Feeding method The feeding method for soybeans is to inspect the pond more than three times a day and add more as soon as they are eaten, with the daily feeding amount based on the principle that it is eaten within 24 hours. Pellet feed is fed with a feeder. After the fingerlings are stocked, sufficient bait should be fed according to conditions such as weather and water temperature. Especially in June, when the water temperature rises and the fish gain weight, the feeding amount should be increased at the right time. The feeding amount should be controlled on the principle that the fish are full and no fish are competing for feed in front of the feeder. 3. Daily management After the fingerlings are stocked, pay attention to changes in water quality. In the early stage, add water once every half month. In June, the fish eat more and excrete more, and water quality is prone to deterioration, so add water once a week, 20 cm each time, and keep the pond water color "fertile, lively, tender, and refreshing." Start the aerator at the right time. In the later stage, the fish load in the pond increases. When the weather changes, start the aerator early to prevent fish from gulping air at the surface. Patrol the pond frequently and inspect frequently so as to discover problems in time and understand the fish's feeding situation. 4. Fish disease prevention and control In the mixed-culture pond, on April 25, before stocking freshwater pompano, kill parasites and disinfect. The main disease during the farming process is enteritis. Soaking soybeans in florfenicol or mixing it into pellet feed and feeding for three days can take effect. 5. Harvest Freshwater pompano is easy to catch. With the first seine haul, 90% of the pond can be caught, and after two more seine hauls, the pond can basically be caught clean.
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Precautions for Farming Freshwater Pompano During the High-Temperature Season
When summer arrives, temperatures are high, water quality changes easily, and fish diseases occur easily. To reduce the impact of high temperatures on freshwater pompano farming, demonstration households are reminded to pay attention to the following points: 1. Copper sulfate and trichlorfon, as traditional chemical drugs, are widely used in fishery production, and sometimes
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Prevention and Treatment of Oral and Lower Jaw Boils in Freshwater Pomfret Farming
[Cause] The pathogen may be bacteria, but it has not been isolated and identified. The main conditions for the pathogen to cause this disease are the oxidative deterioration of meat residue and oil paste in pelleted feed after long-term storage, and the deterioration of water quality. [Symptoms] Diseased fish show reduced feed intake. They swim slowly at the water surface and respond sluggishly,
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