Every year the seasons change, it is also the time when the water temperature fluctuates the most, the fish are susceptible to stress and poor physical fitness, and this period is also the high incidence of small melon insects, especially when summer and autumn alternate.
Seawater melon worm, also known as stimulus cryptonucleosis, appears every year in the autumn of the season when the water temperature drops, but with the increase of breeding density and the increase of the number of fish steaks in the sea area, or the unreasonable distribution of fish rafts and slow flow rate, it may cause the stimulation of cryptonuclear worms to break out early.
Present with symptoms
When the fish is seriously infected by the small melon worm, the fish body is covered with small white spots, commonly known as white spot disease; The white spots will be on the skin, fins, gills, head, mouth and eyes of fish; In microscopic examination, you can see a pear-like insect body, and a horseshoe-shaped transparent kernel can be seen under the curled worm body, which can confirm that it is a small melon worm!
In recent years, the occurrence of seawater melon worm disease is closely related to the increasing culture density in the sea area. In addition, the disease also occurs especially when the environment in the sea area changes 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, it is still possible to effectively control small melon insects through preventive methods.
It is recommended to improve the immunity of the fish, reasonably control the density, ensure sufficient dissolved oxygen in the water, use some plant products to prevent, prevent insects + improve the immunity of the fish, and avoid the infection of pests as much as possible.
1. Disinfection and prevention: povidone-iodine poke bottle hanging bag, US cubic meter cage with 10 ml povidone-iodine solution, hang in the direction of the water or put in the middle of the cage.
2. During the peak period of the disease, keep the water flowing, which is conducive to the adult worms and cysts and larvae that are separated from the fish body away from the breeding area, and the sick and dead fish should not be discarded at will, which can greatly reduce the chance of larval dispersion, and strengthen prevention and control when the physique is not good after the typhoon.
3, internal prevention and control, for cage culture, water is fluid, for some splashing drugs are difficult to play a role, through internal products, small melon insects can be prevented and controlled, so that small melon insects in the environment can not parasitize on the fish body.
Lechang multi-bract essential oil extracted from the leaves of multi-bud eucalyptus, multi-bract eucalyptus itself has a strong avoidance effect on parasites and insects, so in use can expel parasites from the fish body, and the nutrients required by the parasites come completely from the host (fish body), and the parasites do not have the host to provide nutrition, and they die naturally in the water body.
The article was transferred from the "California Perch Frontier" WeChat public account.
