Apophallus brevis

ALSO KNOWN AS: Black Grub, Black Spot Disease

Apophallus is a digenean trematode with a complex life cycle that involves three hosts: fish, snail and loon (bird). Parasite metacercariae become encysted in the fish host, causing the characteristic black spots.

Distribution: Common in freshwater environments

Detection Methods: Microscopic exam – wet mount

Hosts: Various freshwater fish species

Target Tissue: Skin