The cell line CLC (Carp Leukocyte Culture) was established from peripheral blood mononuclear cells of a normal 2 year old female common carp, Cyprinus carpio. They possess phagocytic activity and are reported to be stimulated by TNF, gamma-interferon and LPS therefore resembling characteristic features of monocytes / macrophages. CLC replicate fish viruses e.g. IPNV, PFR, SVCV and VHSV.