sera guide - Healthy aquarium fish

2.8 Diseases caused by crustaceans Observation White to grayish blue crustaceans sized 0.5 – 3 mm on the gill filaments. Diagnosis: Anchor worm / Lernaea Treatment: page 36 Diagnosis: Parasitic copepod / Ergasilus Treatment: page 36 Observation White, bar shaped crustaceans with two small sacs at the end, they stick deeply and firmly in the skin; anemia and emaciation of the fish. Platy with Lernaea Lernaea on a caudal fin Ergasilus on the gills (gill lid removed) Photo: Dr. Dirk Kleingeld 19