sera guide - Healthy aquarium fish

2.7 Diseases caused by fish leeches Fish leech Diagnosis: Fish leech / Piscicola sp. Treatment: page 35 Observation Circular bloody inflamed areas measuring 3 – 8 mm on the skin of the fish; up to 5 cm (2 in.) long (often shorter) worms with suction cups at both ends of the body and a ring pat- tern; can be found on aquatic plants or on the fish them- selves. Diagnosis: Fish louse / e.g. Argulus Observation Fish jump and swim hectically; flat (louse-like), almost trans- parent crustaceans sized 4 – 14 mm with two black eyes vis- ible on the skin of the fish; red sting marks on the fish skin. 2.8 Diseases caused by crustaceans Argulus on a Koi Fish leech on a Discus Treatment: page 36 18