Photomicrograph of heart ventricle of catla infested with Argulus japonicus. a) Vacuolar degeneration (vd) accompanied with disrupted myocardium tissues (10×); b) Coronary blood vessel (cbv), epicardium (ec) myocardium (mc), cardiac muscle showed necrotizing endocardium (nce), infiltrated lymphocytes (ilc), degenerated myocardium (arrow heads) accompanied with atrophy (at) and hypertrophied cells (pk) (40×).