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Feed and feeding method of guppies
Saprolegniasis, also known as "white spot disease" or "skin mildew," is a common fungal infection affecting fish, particularly young grass carp. It typically occurs during late spring and early summer when water temperatures are low and rainfall is frequent. During this period, fish seedlings are often in the process of being netted or transported, making them more susceptible to injury. Scratches on the fish's body, scale loss, or other physical damage can create entry points for the fungus, leading to infection.
To prevent and treat Saprolegniasis, it’s essential to minimize fish injuries. During transportation, adding 0.04% salt (40 mg/L) and 0.004% baking soda solution (4 mg/L) to the water can help reduce the risk of infection. This mixture can also be used for soaking or spraying the fish. Another effective treatment is Methylene Blue (also called Methyl Blue), which should be applied at a concentration of 2–3 grams per cubic meter of water. The treatment can be repeated every 2–3 days. For direct application, diseased fish can be soaked in a 10 g/m³ Methylene Blue solution for 10–20 minutes, followed by an immediate water change.
Another option is Potassium Permanganate (Bromo Oxygen Hydrate). At a concentration of 0.15–0.2 g/m³, it can be used for prevention every 15 days. When treating active infections, the dosage increases to 0.2–0.3 g/m³. If the condition is severe, the treatment should be repeated for 2–3 consecutive days.
A traditional and effective remedy involves mixing 2.5–5 kg of Pu juice, 0.5–1 kg of salt, and 2–20 kg of human urine per 667 square meters of water. This combination has been found to enhance the therapeutic effect significantly. Always ensure proper dilution before applying any treatment, and monitor the fish closely after each session to avoid overexposure or adverse effects.
Prevention is always better than cure, so maintaining good water quality, minimizing stress, and handling fish carefully are key to avoiding Saprolegniasis outbreaks.