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Veterinarians from RUDN University have developed a way to increase the resistance of carp, the most common fish in fish farms, to the harmful effects of ammonia, which is found in almost all water bodies. The researchers found that the amino acid arginine added to fish food can be helpful. The results are published in the journal Aquaculture.
One of the main problems of fish farms is the pollution of water with ammonia (NH3). The compound gets into water bodies via human activities, from wastewater treatment plants, and runoff from livestock farms and fields where nitrogen fertilizers are used. Ammonia reduces the ability of hemoglobin to bind oxygen, acts on the nervous system, affects red blood cells, and can lead to fish death.
Director - Department - Veterinary - Medicine - RUDN
Director of the Department of Veterinary Medicine of RUDN University Yuri Vatnikov and his colleagues have developed a way to use food additives to increase the resistance to ammonia in common carp, a species of great economic importance—fish farms sell about 4 million tons of carp per year, according to the U.N. Food Organisation (FAO).
The veterinarians conducted two experiments in which they examined the effect of arginine, an amino acid that stimulates the release of growth hormone. In the first experiment, 600 carp were distributed over four tanks and kept there for 10 days, so that the fish adapted to new conditions.
Weeks - Fish - Tank - Feeding - Options
After that, for two weeks, the fish in each tank were fed following one of four feeding options: with the addition of arginine in the proportion of 0.25 percent, 0.5 percent, or 1 percent by weight of the food, and without the addition of arginine (control group). Then the fish from each tank were distributed over 15 30-liter aquariums with 10 animals each. An ammonia solution was added to the water for three hours in concentrations of 0.7,...
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