Pest control in fish ponds in spring

First of all, to check whether there are a large number of parasitic harm, if so, you can choose to kill insects, if not, do not need to kill insects. If there are really insects to kill, we must first do a good job of changing the bottom of the fish ponds. If the water quality is good, there is enough dissolved oxygen, and there will be fewer pests. Then use insecticides to kill insects. If there are any insects, they will kill them exclusively, and if there are no insects, they will kill them all. Disinfect the fish ponds after killing insects to prevent the recurrence of insect pests. It is also necessary to fertilize water in time and increase algae and zooplankton.

What are the common parasites in fish?

There are mainly melon worm, Cryptosporidium, oblique tube worm, myxosporidium and so on.

1. Small melon insects: they are mainly parasitic on the skin, fin, Gill, head, mouth and eyes of fish, forming small white spots in the cysts, and small white spots can be seen all over the fish body in severe cases. Fish can not find food after infection, coupled with secondary bacterial and viral infection, can cause a large number of fish death.

2. Cryptic whipworm: most parasites on the gills. When a large number of parasites occur, the body surface of the fish blackens, the Gill filaments are red and swollen, the gills and body surface secrete a large amount of mucus, which destroys the epidermis, making it difficult for the fish to breathe and suffocate to death.

3. Oblique tube worms: a large number of parasitic fish in the Gill, skin and nasal cavity, a large number of parasitic fish body surface and parotid secretion of a large amount of mucus, the body surface to form a pale or light blue layer of mucus, Gill tissue is seriously damaged, sick fish have difficulty breathing, and soon die.

4. Myxosporidium: it often appears on the skin of common carp and crucian carp, often covering the whole body with white dots or massive cysts, seriously affecting the growth and development of fish, and even causing death.

Second, how to kill fish parasites?

1, small melon worm: it is not resistant to high temperature, more than 28 degrees will die, can raise the water temperature to 30 degrees. It can also be soaked in 5% salt water for a few days, or in 2/1000000 (2ppm) methyl blue solution for 6 hours a day.

2. Cryptotrichum: sprinkle copper sulfate or the mixture of copper sulfate and ferrous sulfate all over the pool.

3. Oblique tube worm: sprinkle the mixture of copper sulfate and ferrous sulfate in the whole pool.

4. Myxosporidium: Crystal trichlorfon was sprinkled all over the pool.