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Neobenedenia melleni  is a significant monogenean pathogen of fish in aquaculture facilities and public aquaria. Immunity after exposure to live  N. melleni  is well established, but the mechanisms of immunity remain unclear. In this study, tilapia ( Oreochromis mossambicus ) were continuously exposed to  N. melleni  over a four-month period and assessed for immunity as determined by a reduction in the number of parasites dislodged from the experimental animals during freshwater immersion. Specific mucosal and systemic antibody levels were by determined via enzyme-linked immunosorbent assay. At 45 days postexposure (DPE), fish displayed high parasite loads and baseline levels of mucosal antibodies. At 102 and 120 DPE parasite loads were significantly decreased, and antibody levels were significantly increased for mucus and plasma samples. The correlation between immunity (reduction in parasite load) and an increased humoral antibody response suggests a key role of antibody in the immune response. This is the first report of immunity against  N. melleni  that is associated with specific mucosal or systemic antibodies.

Neobenedenia melleni-Specific Antibodies Are Associated with Protection after Continuous Exposure in Mozambique Tilapia