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Xanthine oxidase (XO) activity (nmol/min/mg protein) in liver of fed and fasted fish during acclimation to different salinities and exposure to HEA. Values are mean ± S.E. Asterisk (*) indicates a significant difference between the ammonia exposed fish and its respective control at each salinity (*P < 0.05), dagger (†) denotes the significant difference between fed fish and its respective fasted fish counterpart († P < 0.05).
