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Adverse changes in fish pond water quality and regulation

. 4. Timely and adequate fertilization. In principle, requires less time and more. Growing season in general each time the fish chase a l5 urea 7.5 kg / ha, TSP 7.5 ~ l5 kg / ha. Phosphorus application to a single high temperature season, each hectare l5 ~ 30 kg. 5. Often filling the new water. In the early spring and late autumn, the general water 1 l0 days, every 20 to 30 cm; growth season, 1, 5 to 7 days injection times l0 ~ 20 cm; the hot season in 2 to 3 days injection 1. 6. Sediment stirred regularly. Stir 1 can be two weeks, the pond sediment, the election to noon on sunny days. Note hypoxia floating head in hot season. 7. Use oxygen machines and other machinery to regulate water quality. I usually install units per 0.3 hectare 3 kW aerator. Pay attention to boot. 8. Pouring lime water ponds on a regular basis. According to changes in pH value, usually 1 every two weeks, each time throwing 225 to 375 per hectare kilograms. Pay attention to and control of fish diseases with the fertilizer spraying time staggered, so as to avoid adverse effects. 9. Release oxygen generating agent. Commonly used calcium peroxide (CaO,[link widoczny dla zalogowanych],), barium peroxide (BaO) and so on. 10. Control the composition of plankton. Prevent a large number of multiplication method of cyanobacteria: �� the common law. A large number of multiplication of cyanobacteria season, to stop manure and nitrogen fertilizer, phosphate fertilizer and often can be a single injection of fresh water, if necessary, splashed pond scum xiangtang, 1500 ~ 2250 kg per hectare. �� mechanical method. Use of aerators, water quality improvement unit, water purification machines. �� biological method. Pool a certain number of white crucian carp polyculture and tilapia,[link widoczny dla zalogowanych], they like to eat algae. �� chemical method. Can be splashed to the pool of ferrous sulfate and manganese sulfate solution, each time the 0.3-0.75 kg per hectare. Some rotifers over wintering pools, available 2xlO-65xlO-6 crystal trichlorfon control, in order to maintain the density of phytoplankton, biological oxygen to ensure the smooth progress. Fish production and fish cultivation is an important part of one. Make a small size, thin fish develop Biaofei Tizhuang large size fish, the key is cultivating in autumn. 1. Improve the living environment. After months of cultivating fish in the pond rearing, aging water quality, dissolved oxygen decreased to reduce food organisms,[link widoczny dla zalogowanych], pathogenic microorganisms and harmful substances increased, the growth of negative species,[link widoczny dla zalogowanych], particularly the growth of individual small fish species is limited grass carp in this water easily sick

. Therefore, we should improve the environment for fish living in water: �� fresh water for injection, the original release 1/3-1/2 water, plus a new water injection; �� fertilization culture water; �� disinfected regularly, each hectare of fish pond with 150 - 225 kg quicklime. Add water to melt evenly sprinkle the entire pond, half a second; �� fry density is too large pool of training may also be transferred, the new fish pond disinfection by conventional clear pond,[link widoczny dla zalogowanych], and fertilize the water and then put species. 2. Reasonable classification match. Sub-pools of different sizes stocked fish, different species of fish to co 9, 1999 with management. Such as to nurture grass-based, can be used with 30% of the silver carp, bighead carp, etc.; as to nurture silver carp, bighead carp-based, with 30% of the grass carp should be. Silver carp, bighead carp species ratio is about 5:1, if the small size of bighead carp, the ratio should be reduced, otherwise the growth disadvantage. General depth of 1.5 meters per hectare of fish pond stocking of small fish of about l0 cm 45000. 3. Cast all bait and fertilizer. Strengthen the training. In the stocking of silver carp, bighead carp pond-based, should fertilization, supplemented by concentrate per hectare fermented fish pond spill of about 750 kg fertilizer and livestock categories, or 75 kg of fertilizer, applied every 2-3 days 1 to cultivated plankton in the water. Dominated by grass carp pond, feeding should be strengthened, each time for every ten thousand fish fed wheat bran, bean dregs, shavings and feed concentrate with 3 to 5 kg, and then with a number of fresh forage, fed 2 per day times. Morning and afternoon, the 1st, the amount fed to the day after eating degrees. 4. Strengthen management. Prevention of fish diseases. Fall of small size fish species in autumn cultivation mouth Zhang Shuqing Zhao Guohua enhanced water temperature environment for the growth and reproduction of various pathogens, easily lead to fish diseases. Therefore, we must insist on early and late Xuntang observed species eating and activities, identify problems and take timely measures. Feeding food to timing, positioning, qualitative, quantitative, residue left over bait fish out in time, food units per half immersion disinfection with bleach 1, and regularly fed bait and spilled medicines. Also note that regulate pond water quality, timely for the new injection of water, fish pond with 300 kg per hectare lime Quanchiposa, about 20 days splashing 1, to improve water quality. Do not disease prevention, the sick

as early as governance, to ensure the robust growth of fish. * 35 *
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