This book is a first trail to record the fish parasitic infections among Arabian Gulf fish with reference to coasts of state of Qatar. The aquaculture industry which is recently tackled in the state has inspired this short pictorial guide. The parasitic infections include Protozoa, Helminths, crustaceans, and some uncommon infections such as hydroids. In addition, a short note is given about the Pathogenic effects and zoonotic potentiality. Two tables are also added to demonstrate the different species of infected fish hosts and also the different infected organs.