7553

7025

كارشناسي ارشد

بوم شناسي آبزيان شيلاتي

اصفهان: دانشگاه صنعتي اصفهان، دانشكده منابع طبيعي

1391

سيزده،57ص.: مصور،جدول،نمودار

ص.ع.به فارسي و انگليسي

نصرا... محبوبي صوفياني

حميدرضا رحماني

14/12/91

عيسي ابراهيمي، يزدان كيواني

مهندسي منابع طبيعي

ID7025

به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي

Abstract Ligula intestinalis lives in the abdominal cavity of fish causing detrimental effects in the host Parasitizing by L intestinalis is known as ligolosis which is one of the most common diseases in freshwater fishes around the world especially in lakes and reservoirs In this study prevalence of parasite in Petroleuciscus esfahani an endemic species in the Zayandeh Roud River and its effects on some growth and reproductive parameters were investigated Sampling was carried out in two different stations The first station polluted was located near Zobahan factory waste refinery whereas the second station control was near Safaieh Bridge between Zarin shahr and Mobarakeh Cities Sampling was done at 3 different times the first one before the spawning season March 2012 and the other two during April and May 2012 respectively A total of 290 individual fish were studied From the 175 fish caught at the polluted station 59 individual contained the plerocercoid of the parasite with an occurrence of 33 71 or one third of the total fish sampled Parasited and non parasited fish from the polluted station were evaluated and compared with each other and then with fish from the control station in order to detect possible effects of other ecological factors on the studied parameters The average weight was significantly different between fish from polluted and non polluted stations which could be explained by other factors such as environmental contaminants The results showed that GSI HSI and liver glycogen were decreased due to the presence of Ligula The significant fecundity decrease in fish from the polluted station in comparison to fish from control station can be explained by the probable interaction between the presence of the parasite and other factors such as the environmental pollutants Some parasited fish showed hemarrage and leucocytes accumulation in liver as well as oocyte degeneration amorphism and atrophy in the gonad tissue of the females due to damage by physical pressure caused by the presence of the parasite The condition factor was not affected by Ligula infection Our results suggest that the parasite can have negative effects on the reproductive parameters in P esfahani threatening the population of this species in Zayandeh Roud River I addition to the environmental pollutants stagnant water and presence of aquatic birds in the sampling station can increase the susceptibility of fish to the parasite Therefore diminishing or stopping the entrance of industrial pollutants to the river as well as controlling the intermediate hosts could decrease the prevalence of this parasite Key words Petroleuciscus esfahani Ligula intestinalis growth reproduction liver glycogen Zayandeh Roud River PDF created with pdfFactory trial version www pdffactory com

نصرا... محبوبي صوفياني

حميدرضا رحماني

عيسي ابراهيمي، يزدان كيواني