In this paper the major description, epidemiology, pathogenesis and clinical sign, diagnosis, treatment and control of parasitic crustaceans in fish has been reviewed.
Parasitic crustaceans are increasingly serious problem in cultured fish and can infect wild populations.
There are main groups of parasitic crustaceans affecting commercially important aquaculture species, most of which are external parasites are the branchiura, copepod and isopod .
In wild fish populations, parasitic crustaceans may be influenced by factors related to the host's life history, which includes environment, body size, physiology, behavior, immunology and diet (Acacio, Varella, & Malta, 2012; Carvalho, Del-Claro, & Takemoto, 2003; Fontana, Takemoto, Malta, & Mateus, 2012; Guidelli, Takemoto, & Pavanelli, 2009; Walker, Harris, Velde, & Bonga, 2008).
In 12 species of hosts from a reservoir in Iran, only Cyprinus carpio, Barbus iacerta and Capoeta trutta were parasitized, and parasitic crustaceans community was constituted only by Lernaea cyprinacea and Tracheiiastes poiycoipus (Bozorgnia, Youssefi, Barzegar, Hosseinifard, & Ebrahimpour, 2012).
Wild fish usually coexist in equilibrium with parasites within the environment, but this balance in the parasite-host-environment interactions, when broken by environmental changes, may negatively affect hosts and, consequently, increase their susceptibility to infections by parasitic crustaceans (Carvalho et al.