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Parasites detected at histological evaluation. (a) Digestive gland: ciliates in the gland tubules (arrow), hematoxylin-eosin (HE); (b) gill: Turbellaria, HE; (c) adductor muscle: Trematode, HE; (d) gill: Eugymnanthea inquiline, HE.; (e): intestine: Mytilicola intestinalis in lumen, HE; (f) ovarium: Steinhausia mytilovum in oocyte (arrow), HE.
