Investigation of nematodes in chub mackerel (Scomber Japonicus Houttuyn, 1782 ), horse mackerel (Trachurus trachurus (Linnaeus, 1758 )) and sardines (sSrdinella aurita Valenciennes, 1847 ) caught in Çanakkale region

''Investigation of Nematodes in Chub mackerel (Scomber japonicus Houttuyn, 1782 ), Horse mackerel (Trachurus trachurus (Linnaeus, 1758 )) and Sardines (Sardinella aurita Valenciennes, 1847 ) Caught in Çanakkale Region'' This study was carried out on Chub mackerel, Sardines, Horse mackerel sampled on a monthly basis in Çanakkale Region of Nort Aegean Sea between January 2010 and June 2011. This study was carried out on a total of 1071 fish; including 243 Chub mackerel (Scomber japonicus) 377, Horse mackerel (Trachurus trachurus) and 451 Sardines (Sardinella aurita). Parasitologic examination showed that 108 out of 243 Chub mackerel, 140 out of 377 Horse mackerel, 16 out of 451 Sardines were infected with endohelmint. Two parasite species were identified from 3 fish species examined. In parasitological examination, Anisakis simplex was identified only in the body cavity and muscle of Chub mackerel. Contracecum aduncum was identified in body cavity and intestine of Horse mackerel and Sardines. During the parasitologic examination total of 1788 Anisakis simplex were counted in infected Chub mackerel; intensity, prevalence and abundance of that were 16,55, % 44,44 and 7,35 respectively. 988 Contracecum aduncum were determined in infected Horse mackerel, intensity, prevalence and abundance of that were 7,05, % 37,14 and 2,62 respectively. 76 Contracecum aduncum were found in Sardines, intensity, prevalence and abundance of that were 4,75, % 3,54 and 0,16 respectively. Keywords: Çanakkale Region, Chub mackerel, Horse mackerel, Sardines, Nematode.