Grass carp anorexia is an abnormal phenomenon caused by parasites, environment, weather, and bait, and it is particularly unusual in early spring, ie in March to May each year. The year-round production has had a certain impact. Below the author of grass carp early spring anorexia symptoms, causes and solutions to make an analysis.
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. Grassy 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.
The weather is mutated. Due to the alternation of early spring seasons, there are large temperature differences between morning and evening, stress due to sudden changes in the weather, and frequent up-and-down convection in the water layer.
Parasite infection. In early spring, March to May is the generator of anchor head, Chinese sturgeon, trichoderma, and ringworm, and parasitic parasites can also cause anorexia.
Environmental degradation. The main cause of environmental deterioration in early spring is related to sediment and fecal residue. In the case of a gradual increase in temperature, deposition of a hazardous substance in winter begins to accelerate the decomposition and release of harmful hydrogen sulfide and nitrogenous wastes (eg, Ammonia nitrogen, etc.), and accelerated decomposition of residual sediments with large amounts of feces will also consume oxygen in the water, reducing the pH of the water, resulting in greatly reduced blood oxygen supply capacity and oxygen supply, affecting feeding.
Insecticide poisoning. In particular, in some areas with low intensive culture, many farmers tend to increase their doses during the first insecticides in the spring, such as trichlorfon. High doses of organophosphorus pesticides cause fish neurotoxicity, resulting in feeding. Falling situation.
Feed problems. Some of the early feed or raw materials in the early spring have deteriorated due to long storage time, and they may also cause fish 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
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.
Kill parasites. Early spring before and after the Ching Ming Festival can be used benephrine net, avermectin to kill Chinese sturgeon and other head crustacean crustacean parasites, preferably used once a week for two times, the effect of killing is more thorough; another for this stage of high trichoderma And the ringworm can be used in advance to eliminate the type 2 insects, and insecticide safety of Chinese medicine is effective.
Good fat pond water. The ultimate cause of most grass carp's anorexia in the early spring is related to the oxygen supply of the fish. The water is rich in algae and has sufficient oxygen. It not only helps eliminate harmful substances in the transformed water, but also guarantees oxygen supply to the fish as much as possible; , You can use Hua Yang "green source peptide" + "sweet water", fertilizer effect is better.
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 agents" to detoxify, enhance 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 organophosphate insecticide poisoning, “shuanghuohydrotoxic agent†can be used for detoxification, and for pyrethroids or other insecticide poisoning, “stress detoxification spirit†can be used.
Fertilizer. "Green Source Polypeptide" + "Shuangshuilai" can not only play the role of algae and fertilizer, but also adjust the water color to keep the water body fresh.
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