Relationship between parasitic infection and some hematological parameters of (Sander lucioperca) caught of the Caspian Sea part of Anzali coast

The study parasitic infection on some hematological parameters of Sander lucioperca in the Caspian Sea, The catching of 32 Sander lucioperca caught in the Bandar Anzali coast during fishing season of 2008-2009 (6 month), and this fish transferred lively to aquaculture research center of inner waters. After biometry and age determination of fish,blood-taking has been done. Blood was taken using a syringe from peduncle vein and poured into vials containing Heparin. Hematological parameters in blood samples were measured following laboratory standards methods. Then caught fish were studied internal and external parasitic. Parasites have been separated and determined by the means of valid recognition keys. Results showed that, five species of parasites were identified in this fish which include Diplastomum spathaceum ، Dactylogyrus sp. ، Trichodina sp. ، Achtheres percarumand Eustrongylides excisus. Results obtained indicate that percentage of lymphocyte and neutrophil in parasitized fish (Diplastomum spathaceum, Eustrongylides excisus) was significantly higher (P<0.05, Man Whitney) than that in non-parasitized fish.