The infection rate of parasites in California perch is high, especially the main infection of wheelworms, cupworms, hook larvae, etc. Is also higher, and there are also individual pond infections with oblique tubeworms, caterpillars, etc.; from the symptom point of view, California perch is the most common in white body, white tail rotten tail, "whirling" and so on.
California perch seedlings gradually enter the screening link, which is easy to cause damage to the fish body, while the California perch enters the scattered spring period, has poor resistance and is prone to infection. On the whole, we should focus on the prevention and control of insect and fungal diseases.
1. Parasites of California perch seedlings: wheelworm, cupworm, caterpillar, hook larvae, oblique tubeworm, etc.
The infection rate of wheelworms in California perch is high, but a large number of infections with wheelworms are relatively rare, and wheelworms are mostly parasitic on the tail fins, fins and other fins of fry, and there are often not many wheelworms on the catfish, so when dealing with wheel insects, it is not appropriate to take a strong medicine, it is recommended to use Chinese herbal medicines such as matrine or mild wheelworm special drugs for treatment.
The infection of cupworm is common in California perch seedlings with trauma or poor constitution due to the onset of the disease, and occasionally a large number of infections such as fins and gills are seen, but their harm is not large, and it is easier to deal with, according to the guidance of the use of ciliate qing and other special drugs to kill ciliates. Caterpillars are the same.
Hook larvae are mussel larvae, commonly found in incomplete ponds, because the parasitic host after the pipette into the host to absorb nutrients, so the general insecticidal drugs are ineffective. Fortunately, when it is parasitic in small quantities, it is not a big problem and can not be handled.
The infection rate of intracertrae is not high, but it is extremely harmful. If there is an infection, it is recommended to use special drugs for killing in time.
For parasites can be prevented and controlled using safe drugs, Lechang eucalyptus essential oil has a natural monoterpene, sesquiterpene, 1,8-eucalyptus and other insect-suppressing ingredients, can act on multiple target cells, for common wheel worms, ringworms, oblique tube worms, anchorhead mackerel, etc. have a good prevention and control effect, can block the transmission route of parasites, prevent and control parasite parasite parasites.
2. California perch bacterial disease: Xanthobacterium
Judging from the testing situation, the liver, spleen, kidney and other inoculations of fish with mature body disease and white-headed and white-tailed disease failed to cultivate obvious colonies; but the detection rate of flavivius on the surface of the diseased fish was almost 100%. Although it is not yet possible to determine whether the bacterium is the first pathogen, there is no doubt that the bacterium is an important pathogen of mature body disease and white-headed and white-tailed disease.
Xanthobacterium mainly invades the surface of the fish body through the skin, so disinfectants with strong permeability should be selected when disinfecting.
3. California perch virus disease: elastin virus/neuronal necrosis virus
Recently, the "whirling" disease of California perch is very rampant. The disease is acute, the number of deaths is large, improper treatment will even lead to the total pond collapse, and the medication needs to be very cautious. With current testing, the cause of the disease is most likely a bullet virus or a neuronecrosis virus. Although there is no cure for viral diseases academically, according to market feedback, five yellow + honeysuckle splashing water can effectively control the disease (it has been verified many times). For California perch seedling ponds with "whirling" disease, it is necessary to use drugs carefully and control the amount of feeding, and it is recommended to use five yellow + honeysuckle to splash water.
4. Adult parasites: nail worms, etc
The nail worms themselves do not cause the death of adults, but the bites of the nail worms cause secondary fungal or bacterial infections that are fatal. For ponds that have not been killed for a long time, you can choose Lechang eucalyptus essential oil for prevention and control, cut off the transmission route of parasites, and effectively prevent and control parasite parasites.
5. Adult bacterial disease: nocardiosis
Nocardia is a chronic pathogenic bacterium that seriously harms California perch. The pathogenic bacteria have a long incubation time, and seriously damage the immune organs of the host, and there is no efficient drug for the bacteria in the fishing drugs currently allowed to be used in China, so the treatment of the disease is more difficult. Daily patrols should be strengthened to patrol the pond, if there is gill bleeding or body surface pustules and other symptoms, timely sampling for professional testing.
In terms of prevention, we should avoid strong irritating operations such as frequent and large water changes, use more beneficial bacteria, and maintain excellent water quality; pay attention to controlling feeding and avoiding urgent feeding. (This article is transferred from [California Perch Frontier].) If you have copyright questions, please contact [email protected]. ）
【Keywords】:California perch seedling parasitic bacteria aquaculture