What are the precautions for pond disinfection and pest control in spring?

First, check whether there is a large amount of parasite infestation. Only if there is, can pest control be chosen; if there is not, no pest control is needed. If there really are pests to control, first do the pond bottom improvement work well; when water quality is good and dissolved oxygen is sufficient, there will be fewer pests. Then use insecticide to kill the pests. If there are pests, target the specific pest; if there are none, use a broad-spectrum treatment. After pest control, disinfect the pond to prevent pest recurrence. Also fertilize the water in time to increase algae and zooplankton.

1. What are the common parasites of fish?

They mainly include Ichthyophthirius multifiliis, Cryptobia, Chilodonella, and Myxosporidia, etc.

1. Ichthyophthirius multifiliis: It mainly parasitizes parts such as the skin, fins, gills, head, mouth cavity, and eyes of fish, forming cysts that appear as small white dots. In severe cases, small white dots can be seen all over the fish body. After infection, fish cannot feed, and together with secondary bacterial and viral infections, this can cause the death of large numbers of fish.

2. Cryptobia: It mostly parasitizes the gills. When there is a large amount of parasitism, the fish body surface turns black, the gill filaments become red and swollen, and the gills and body surface secrete a large amount of mucus, damaging the epidermal tissue, making it difficult for the fish to breathe and causing death by suffocation.

3. Chilodonella: It parasitizes in large numbers in the gills, skin, and nasal cavity of fish. When there is a large amount of parasitism, it stimulates the fish body surface and gills to secrete a large amount of mucus, forming a pale white or light blue mucus layer on the body surface. The gill tissue is severely damaged, and the diseased fish have difficulty breathing and soon die.

4. Myxosporidia: Those that often appear on the skin of carp and crucian carp tend to cover the whole body with white dot-like or block-like cysts, seriously affecting the growth and development of the fish and even causing death.

2. How are fish parasites controlled?

1. Ichthyophthirius multifiliis: It cannot tolerate high temperatures and will die above 28 degrees, so the water temperature can be raised to 30 degrees. It can also be soaked in 5% salt water for several days, or soaked in a 2 ppm methylene blue solution for 6 hours each day.

2. Cryptobia: Spray copper sulfate or a mixture of copper sulfate and ferrous sulfate over the whole pond.

3. Chilodonella: Splash a mixture of copper sulfate and ferrous sulfate over the whole pond.

4. Myxosporidia: Spray crystalline trichlorfon over the whole pond.