Circulating Water Supply Water Quality Important Indicators – Aquatic Forum – China Animal Husbandry Website – A useful animal husbandry website
In circulating water breeding, water is an important factor, is the necessary conditions for breeding organisms, good water quality and ecological environment are the basis of aquaculture industry.
In the past, farmers and technicians judged that the water quality is good and bad, and also summarizes good experience, but for specific data, it is impossible to estimate that the water quality is used to obtain specific data with water quality monitoring instruments. Normally testing water quality indicators have several: 1, water temperature
Different cultured species have their own different suitable growth temperatures. The water temperature is controlled within the best growth range of fish, which helps the fish’s rapid growth, high feed conversion rate, saving oxygen, and has a preventive role in many diseases.
2, dissolved oxygen
water dissolved in oxygen is the primary condition for breeding organisms, and the high and low of dissolved oxygen directly affects the growth and feed efficiency of water products. In high dissolved oxygen body, organic matter is completely decomposed under aerobic bacteria, and the product is a carbon dioxide, inorganic salt, nitrate, and other non-toxic and harmless substances. In terms of hypoxia or hypoxia, organic matter is mainly decomposed by anaerobic bacteria, and the product is ammonia nitrogen, nitrite, hydrogen sulfide, organic acid, etc., has a large poisonous effect on the breeding variety.
3, the pH pH reflects the concentration of hydrogen ions, which will affect the ratio of toxic substance ions and non-ionic properties such as ammonia nitrogen, thereby determining the toxicity of ammonia. If non-ionic ammonia (NH3) is very harmful to the fish, ionic ammonia (NH4 +) is non-toxic, and the proportion of the two depends on the size of the pH, and the pH is high, and the NH3) is much more poisonous. In addition, in biosititation, nitrifying bacteria is also very sensitive to pH, nitrite bacteria and nitrate bacteria are the strongest at 7.0-7.8 and 7.7-8.1, which are exceeded, and their activity decreases; under acidic conditions, Nitrification bacteria cannot grow, which is basically the same as the fish’s farming.
In general, the pH of the circulating water culture system is controlled in the range of 7-8.5.
4, nitrogen-containing organic matter in nitrite breeding water, first turn to ammonia nitrogen in the water, and then convert to nitrate nitrogen, and finally nitrate nitrogen. When the nitrification process is blocked, the nitrite is increased, resulting in a high main reason for the high of the nitrite content in water, and the pool is insufficient, and the balance of the microbial species in addition to the use of bactericidal drugs is also the reason for the increase in nitrite content. To ensure breeding organismsSafety, generally controlling the nitrite in water at 0.1 mg / L or less, “Fisheries Water Standard” specified in the culture of the nitrite in 0.20 mg / L below. In the actual culture, the nitrite concentration of shrimp pool should not exceed 0.15 mg / L, and the nitrite concentration of the aquaculture fish is below 0.05 mg / L.
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