بررسي آلودگي‏هاي انگلي ماهي كپورنقره‏اي (Hypophthalmicthys molitrix) در برخي آببندان‏هاي شهرستان فريدونكنار (استان مازندران)

A survey of Parasites of Silver carp (Hypophthalmicthys molitrix) is some of Fraydonkenar reservoirs

For the firest time production of the fish warmes took place in decade forty in farm and veterinary company in rasht city. At this province trainee warm fishes almost in the reservoirs. Therefore Fraydonkenar city have 25 reservoirs in the Mazandaran and the importance value in production this matter. So that choiced 3 reservoirs for sampeling in six month for a period traineing. For this reason 180 silver carp were surveyed during April 2008 to septamber 2008. So after fishing and carrying to the laboratory different fish organ such as skill, gill and digestive rogan have been studied. According to the reserches for species of parasites by the name of Trichodina sp, chilodonella sp in skill, Dactylogyrus sp in gill and Diplostomum spathaceum in eye were recognized. Between these 4 parasites, Dactylogyrus sp had the highest Prevalence (78/33) and Parasite number range (2-98). While the lowest prevalence was related to Trichodina sp (41/11) and the lowest mean in tensity were referred to (1/04), the lowest number range was related to Trichodina sp (1-7), also according to this research parasitical pollution of silver carp had month difference.