بعض الجوانب البیئیة لنبات أکانثوسیفان بومفورهینشوس spindletruncatus الطفیلیة فی Barbus xanthopterus من نهر الزاب الصغرى فی شمال العراق

Monthly samples of the cyprinid fish Barbus xanthopterus were collected from Lesser Zab river, north of Iraq during the period from November 2000 until the end of November 2001. Fishes were found infected with the acanthocephalan Pomphorhynchus spindletruncatus. The rate of infection was 28.1 %. No significant differences were noticed between male and female fishes infected with this parasite. Prevalence, mean intensity and abundance of infection with P. spindletruncatus increased with the increase of fish length. Infection rate was high during Spring and Summer, and low during Autumn and Winter.