Filamentous Bacterial Disease
Symptoms: Filamentous bacterial disease is caused by infection with Aspergillus niger, hyphae are long and adhere to the silk, appendages, and carapace of larvae. In severe cases, the local surface is not smooth, and there are sites where the filamentous bacteria adhere to, often at the same time. Sturdy ciliates, monocytes, and other particles appear. This situation is likely to cause the obstruction of the ankle and the destruction of the epithelium of the orbital epithelium. The infected larvae weakened and sank at the bottom of the pool and died for a long time.
Etiology: Microscopic examination revealed filamentous bacteria, hairlike, on the upper or appendage. This symptom often occurs in the period of shrimp and juvenile shrimp. This is related to the excessive number of monocytic algae in the early stage and artificial bait during the period of the clams. As a result, the organic matter content in the water increases and the water temperature of the nursery is higher.
Treatment: Quanchiposa copper complex, so that the water containing complex copper 0.2ppm ~ 0.5ppm for 3 days. Quanchiposa potassium permanganate, so that the body of water containing 0.8ppm potassium permanganate, the second day for water. It must be noted that potassium permanganate is a strong oxidant, excessive use will damage the larva tissue of the shrimp seedlings, and the use of potassium permanganate breeding ponds is also difficult to adjust the water quality later.
Glowing bacterial disease
Luminescent bacteria are one of the most serious diseases in nursery production. It occurs from the braided to the larvae, and the common prawn and prawn are more common. Its rapid onset and high mortality rate pose a serious threat to nursery work.
Symptoms: At the beginning of the disease, the ability of larvae to fall, often located in the middle and lower layers of water, scampi and prawns bouncing, poor phototaxis, reduced or no feeding, and body whitish, especially the larvae with milky white, sudden death or death. It will fluoresce in the dark, and the brightness of the fluorescence will vary with the degree of disease and the size of the larvae. Fluorescence will not be visible at the beginning of the disease. When the larval is in a state of sudden death, a weak fluorescence will be seen. The fluorescence emitted after the death of the larvae is highest. Strong, sustainable more than ten hours, until the corpse is decomposed can not see the fluorescence.
Etiology: The infection pathway is seawater without sedimentation. After being incorporated into the nursery pool and warming, the number of vibrio strains increases dramatically. Defecation and residual baits in the nursery pond and organic matter are abundant. This provides good vibrio growth and reproduction. Nutritional conditions. The abnormal environmental conditions of nursery, such as the quality of larvae, the excessive density of the lower larvae, and the large difference in water physicochemical factors all cause the infection of luminescent bacteria.
Treatment: Fluvic acid is sprayed on the entire pool to make the body contain 2 ppm of fluprine for 3 times. Quanchiposa sulfamethoxazole was added to make the body of water contain 2.5ppm of compound sulfamethoxazole for 3 times.
Huddle disease
Symptoms: Scoliosis, also known as sticky disease, occurs from the time of nauplii to the larvae. Mild adhesions, the sacral larvae full or full stomach, there is mop, vitality, larval body can still normal abnormal development. When severely dirty. All appendages, abdomen and head and chest of larvae are covered with a lot of dirt. Observed with the naked eye, it is obvious that the appendages are stretched outwards, and the strokes are weak. The microscopic examination shows that the mouthpart has been completely blocked and the juveniles are not dragged. Therefore, shrimp will not bounce, basically in the state of empty stomach, larvae, poor vitality, slowly sinking in the pool, the mortality rate of up to 90% or more, when the application is also useless.
Etiology: poor physiology of larvae, abnormal delay. An excessive amount of algae in the verrucous stage causes death of some algae; or improper feeding of artificial bait causes deterioration of water quality. The water quality of the nursery ponds is large, so that the soluble substances and baits in the pool are agglomerated and the pool water becomes clear.
Treatment: Net 1.5ppm with Hu feet, 1ppm with net inflammation, Quanchiposa. With iodine 0.5ppm, Quanchiposa. With formaldehyde 8ppm ~ 10ppm, Hu foot net 3ppm, Quanchiposa.
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