Grass carp anorexia refers to an abnormal phenomenon of loss of appetite due to parasites, environment, weather, and bait, especially in the early spring, which occurs from March to May every year, and is particularly frequent for farming. The annual production of households has had a certain impact. Here is an analysis of the symptoms, causes and solutions of grass carp anorexic disorder in the early spring.
symptom
Feeding was normal at the beginning of feeding. After a period of time, the feed intake gradually decreased, and sometimes they suddenly did not eat grass or drastically reduced the anomaly of the amount of grass. The fish or clusters were swimming on the surface of the water or licking near the food table. Grass-floating but rarely feeding.
Cause Analysis
Common causes in early spring are environmental deterioration, parasitic infections, weather mutations, pesticide poisoning, and bait problems. After many years of analysis and analysis, environmental factors are the main cause of anorexia in early spring.
Abrupt changes in the weather: Due to the early spring seasons, the temperature difference between morning and evening is large, the stress caused by sudden changes in the weather, and frequent up-and-down convection in the water layer;
Parasitic infections: March to May in early spring are the generators of anchor heads, Chinese sturgeons, trichoderma, and ringworms, and parasitic parasites can also cause anorexia.
Deterioration of the environment: The main cause of environmental deterioration in the early spring is related to sediment and fecal debris. In the case of a gradual increase in temperature, deposition of a winter hazardous substance begins to accelerate decomposition and release of harmful hydrogen sulfide, nitrogen Accelerated decomposition of large amounts of waste (such as ammonia, etc.) and residual bait feces also consumes oxygen in the water, lowers the pH of the water, and results in greatly reduced oxygen supply capacity and oxygen supply to the blood, affecting feeding;
Insecticide poisoning: Especially in areas with low levels of intensive culture, many farmers tend to increase their doses during the first insecticides in the spring, such as trichlorfon, and large doses of organophosphorus insecticides can cause fish poisoning. Neurotoxicity, there is a decline in feeding;
Feed problems: Some feeds or raw materials in early spring have deteriorated due to longer storage time, and they may also cause fish to have anorexia.
In addition there are some reasons, such as insufficient water body fertilizer, too much nitrogen fertilizer application, shallow depth, low alkalinity hardness of the water and other reasons will also lead to grass carp anorexia.
prevention
Quicklime or bleached clear ponds and suntans help to reduce the effects of harmful substances in the bottoms and increase the alkalinity and hardness of the water.
Elimination of parasites: In the early spring before and after the Ching Ming Festival, beetle nets and avermectin can kill crustacean parasites such as Chinese sturgeon, head lice, etc., and it is best to use them twice a week for more effective killing; The high-level trichomonads and ringworms can be used in advance to eliminate the type 2 insects, and the insecticide safety of traditional Chinese medicines is effective.
treatment
For early spring anorexia caused by trichoderma, it can be killed on the first day with “Bacteria elimination†+ copper sulphate, which can not only kill bacteria, but also reduce the probability of occurrence of erythroderma in the later period. Days use "sweet hydrolytic agent" to detoxify, improve the transparency of water, and promote the reproduction of high-quality algae;
For ponds with more fodder and more feces bait accumulating, the organic wastes in the sediment may be decomposed in the morning by using “Douduxiaoâ€, and the “stress Jieduling†may be used in the afternoon to detoxify; the second day may effectively decompose the organic matter. The ability to "live cool" + "sweet water" to adjust the color;
For the organophosphate insecticide poisoning, "shuanghuohydrotoxic agent" can be used for detoxification; for pyrethroids or other insecticide poisoning, "stress detoxification spirit" can be used;
Fertilizer: "Lvyuan Peptide" + "Shuangshuilai" not only plays the role of algae and fertilizer, but also adjusts the water color to keep the water body fresh.
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