Developmental stages of Achtheres percarum (Crustacea: Copepoda) parasitic on European perch, Perca fluviatilis (Actinopterygii: Perciformes)
2007
Piasecki, W. | Kuzminska, E.,Szczecin Agricultural University (Poland). Div. of Fish Diseases
Achtheres percarum is an important copepod parasite (Crustacea: Copepoda) of European perch. Adult females permanently attach to the gill arches, roof of the mouth, tongue, and gill filaments. Early developmental stages (nauplius and copepodid) of A. percarum were acquired through incubation of eggs within egg sacs of females collected from European perch, Perca fluviatilis L., caught commercially in 1994 in Lake Dabie, Szczecin, Poland. All subsequent larval stages were collected from gills of perch caught in the same lake, in 1990. All copepods were fixed and preserved in 75 percent ethanol. The life cycle of A. percarum consists of 7 developmental stages, separated by moults (nauplius, copepodid, chalimus I, chalimus II, chalimus III, chalimus IV, and adult). The nauplius hatches from the egg and quickly moults into the copepodid. Both stages are free swimming and the copepodid is the infective stage, attaching to the host's gill filaments, through the frontal filament
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