Recently, I received a consultation from several grass carp farming bosses, who reported that "the grass carp ringworm outbreak is serious, and the casualties are very large"!
Parasitic causes
With the rise of temperature, aquaculture has entered a new round of breeding peaks, with the increase in feeding, due to the accumulation of a large number of residual bait feces, the water quality is easy to deteriorate, a large amount of organic matter deposited at the bottom of the pond, providing good breeding conditions for ringworms, ringworms infect fish, resulting in most fish secondary to other diseases, a large number of deaths.
Symptoms of infection
Ringworms mainly parasitize on the gills of fish, seriously infected ringworm diseased fish body color black, very thin, swimming slowly, loss of appetite, gill filament mucus increased, gill petals gray- white, breathing difficulties, sometimes can see a large number of insect bodies squeezed out of the gills, the gills are obviously swollen, gill lids open, the diseased fish swim slowly until death.
Consequences of insecticides
Common ringworm insecticides on the market mainly include imidazoles, razones, organophosphorus and antibiotics, the most commonly used is imidazoles, but imidazole drugs have a poor killing effect on ringworm eggs, therefore, once ringworms occur again, it will produce resistance, and then only increase the dose to achieve the killing effect, however, increasing the dose will stimulate the liver and gallbladder of grass carp, resulting in liver damage to grass carp, which in turn leads to the occurrence of grass carp hepatobiliary syndrome.
If you want to solve the grass carp ringworm, the best way is to prevent and control in advance, water quality, physique, and insect repellent work!
How do we do it every day
1. Water quality problems
Regulate water quality, disinfect and sterilize water bodies, and stabilize the water environment;
2. Physical problems
To enhance the physique of the fry, it is recommended to mix or sprinkle happiness 100 to enhance the physique of the fish, care for the intestine, the physique is strong, even if there is a parasitic infection, it will not affect the feeding of the fish.
3. Deal with parasites
The use of Lechang eucalyptus essential oil for insect repellent work is effective against a variety of parasites, with its strong permeability to lyse the cell structure of parasites, to achieve the role of repellent killing, do not hurt fish, do not hurt water.
This article is transferred from the WeChat public account of the Aquatic Insect Resistance Alliance, if you want to know more about aquaculture technology, you can pay attention to it!