Abstracts Submitted to the 8th International Congress on the Biology of Fish Portland, Oregon, USA July 28- August 1, 2008 Compiled by Don MacKinlay Fish Biology Congress Abstracts 1 HISTOLOGICAL AND HISTOCHEMICAL STUDY OF LIVER AND PANCREAS IN ADULT OTOLITHES RUBER IN PERSIAN GULF Abdi , R. , Sheibani , M and Adibmoradi , M. Symposium: Morphometrics Presentation: Oral Contact: Rahim Abdi, Khoramshahr University of Marine science and Technology Khoramshahr Khozestan 64199-43175 Iran E-Mail:
[email protected] Abstract: In this study, the digestive system of 10 adult Otolithes ruber, were removed and the livers and pancreases were put in the formalin 10 % to be fixed. The routine procedures of preparation of tissues were followed and the paraffin blocks were cut at 6 microns, stained with H&E, PAS and Gomori studied under light microscope. The results of microscopic studies showed that liver as the greatest accessory organ surrounds the pancreatic tissue. Liver is a lobulated organ which surrounds the pancreas as an accessory gland among its lobules. Hepatic tissue of this fish is similar to many other osteichthyes. Hepatocytes include glycogen stores and fat vacuoles located around the hepatic sinusoids. Pancreas as a mixed gland microscopically was composed of lobules consisting of serous acini(exocrine portion) and langerhans islets (endocrine portion). However, pancreatic lobules are usually seen as two rows of acini among which there is a large blood vessel. ECOLOGICAL CONSEQUENCES OF A TRANSPANTING EXOTIC FISH SPECIES TO FRESHWATER ECOSYSTEMS OF IRAN: A CASE STUDY OF RAINBOW TROUT ONCORHYNCHUS MYKISS (WALBAUM, 1792) Abdoli, A., Patimar, R., Mirdar, J., Rahmani, H., and Rasooli, P.