Has antibacterial activity against the Gram-positive bacteria E.coli (MIC<50 ug/ml) and P.aeruginosa (MIC<25 ug/ml), and the Gram-negative bacteria S.aureus (MIC<100 ug/ml) and S.pyogenes (MIC<50 ug/ml). Strongly expressed in gills, hemocytes and reproductive tract, with weaker expression in muscle, heart and digestive tract. Not detected in eyes and hepatopancreas (at protein level).