Interestingly, infection of PSD-treated fish resulted in an upregulation of muc2 in skin tissues (PSD-uninfected L2RR = 0.323 ± 0.298, PSD-infected L2RR = 1.30 ± 0.411, p = 0.025), while the opposite was observed in PLD fish (PLD-uninfected L2RR = −0.268 ± 0.167, PLD-infected L2RR = −1.38 ± 0.236, p = 0.025) (GLM, F1,61 = 17.90, p < 0.001; figure 3a). Here, MUC2 is linked to infection.