No, it is not advisable to maintain koi in salted water continuously. Prolonged exposure to salt can disrupt the fish's natural osmoregulatory functions, impair the luster and thickness of the Hi(red pigmentation), and may even lead to fading of the red patterns. When using salt for treatment—especially at higher concentrations—the duration should typically not exceed about 10 days.
Detailed Explanation:
While salt is a valuable tool for short-term stress relief, disease prevention, and treatment, its long-term use can suppress the development of the fish's own immune and regulatory systems. The optimal approach is to employ salt only when necessary—such as during quarantine, after transport, or for specific treatments—and to maintain koi in high-quality, stable freshwater conditions for their long-term health and color development. Always dissolve salt completely before adding it to the pond and monitor the salinity accurately.
