sera guide - Healthy aquarium fish

9.5 sera med Professional Argulol Observation White to grayish blue crustaceans sized 0.5 – 3 mm on the gill filaments. Diagnosis: Parasitic copepod / Ergasilus Observation Clearly segmented, oval, opaque, yellowish to brownish arthropods [1 – 5 cm (0.4 – 2 in.)] are attached to the fish; bloody, dot-shaped sting marks. Diagnosis: Parasitic isopods Ergasilus on the gills (gill lid removed) Photo: Dr. Dirk Kleingeld Parasitic isopod see also page 37 see also page 37 Parasitic isopod on a Butterfly Cichlid 59 Professional