Every summer and autumn, farmers of grouper, yellow croaker and golden pomfret farmers on the southeast coast are extra careful, because this time period is the period when the small melon insects in the seawater are active. In the past experience, the harm caused by seawater melon insects to Guangxi Hainan golden pomfret, Fujian Zhejiang sea yellow croaker, Hainan grouper, aquaculture industry is very large, and will cause serious losses every year.
Seawater melon worms first parasitized in the gills, skin, fins, mouth, nose, cornea and other places of seawater fish, in the initial incidence of fish on the back, each fin first appeared a small number of white dots, visible to the naked eye, so called white spot disease. It will cause discomfort to the fish body, often rubbing with the bottom of the pool, the pool wall, bumping, the late sick fish are seriously uneasy, swimming around the box or jumping out of the water, constantly rubbing the body on the solids, secreting a large amount of mucus on the surface of the body, due to the proliferation of epidermal cells to produce small white sacs; secondary bacterial infections on the body surface, inflamed ulcers.
In recent years, the large incidence of small melon worm disease in marine water is closely related to the increasing density of culture in marine areas. In addition, the disease also occurs especially when the environment in the marine area is changing greatly (such as after a typhoon), the water flow is not smooth, the fish are malnourished, and the disease resistance is poor. So far, although there is no particularly effective treatment at present, it is still possible to effectively control the small melon worm through preventive methods.
Small melon worms stimulate the host to form cysts, making it difficult for general drugs to penetrate lesions and worm bodies. When small melon worms appear, we often use copper sulfate and ferrous sulfate mixture to hang bottles to kill small melon worms. This will not only weaken the resistance of the fish itself, but also open a gap in the invasion of parasites, which is more likely to erupt in large quantities of parasites, and will also make small melon insects resistant. Aquaculture has never lacked effective insecticides, but safe and harmless anthelmintics. The use of Lechang eucalyptus essential oil is safe, non-toxic and non-irritating, effectively preventing golden pomfret melon insects and avoiding the harm of insecticides.
Lechang multi-bract eucalyptus essential oil is extracted from the leaves of multi-bract eucalyptus, the multi-bract eucalyptus tree itself has a strong avoidance effect on parasites and insects, so in use can expel the parasite from the fish body, and the nutrition required by the parasite comes completely from the host (fish body), and the parasite has no host to provide nutrients, and it naturally dies in the water body.
The article is transferred from the "California Perch Frontier" WeChat public account