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Abstracts Submitted to the 8 International Congress on The 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. Symposium: Fish Growth Presentation: Poster Contact: Asghar Abdoli, Department of Biodiversity and Ecosystem Management, Environmental Sciences Research Institute (ESRI), Shehid Beheshti University Tehran --- --- Iran E-Mail: [email protected] Abstract: Abundance and diet of Oncorhynchus mykiss were examined from November 1996 to June 1998 in Madarsoo River in Golestan National Park. A total of 144 specimens investigated (average of Total length= 190mm and Total weight= 80g). Ephemeroptera was the most abundance benthic invertebrates of collected organisms. The Ivelev index showed that Ephemeroptera, Gammaridae and Tricoptera were the most important food items for O.mykiss our result has indicated this species has potentially food competition with fish species, Paracobitis malapterura , Neogobius melanostomus, Neogobius fluviatilis, Albunoides bipunctatus in Golestan National Park stream. A COMPARISON STUDY ON LENGTH-WEIGHT RELATIONSHIPS OF MUDSKIPPERS PRIPHTHALMUS WALTONI(GOBIIDEA) IN COASTAL AREAS OF HORMOZGAN AND BOSHEHR PROVINCES, IRAN Abdoli,L, Abdoli,A, Kamrani,E, nad ,kiabi,B. Symposium: Fish Growth Presentation: Poster Contact: Leila abdoli, Department of Marine Biology – Faculty of Science – University of Hormozgan –P.O.Box 3995 Bandar Abbas - Iran Bandarabbs hormozgan Iran E-Mail: [email protected] Abstract: This study carried out from January 2007to July 2008 in costal of hormozgan and boshehr provinces of Iran, and during this time 320 specimens were catch. Sampling carried out by hand. Specimens preserved in 10% formalin and measured to the nearest mm and weight determined with a digital balance. The relation of weight to length was calculated applying the exponential regression equationw=al b, where W is total weight, L is total length ,a & b the parameters to be estimated(Ricker,1975).Length-weight relationship was calculated for specimens hormozgan province by using Ln weight = - 11.87+3.07ln length for males and Ln weight = -11.51+ 2.99 Ln length for females, and for specimens boshehr , Ln weight = - 10.41+2.76 Ln length for males and Ln weight = - 11.62+3.03 Ln length for females . the slopes (b values) of the length weight regression was not significantly different between sexes.(ANCOVA, P< 0.00) THE SPAWNING MIGRATION OF KISSING LOACH (LEPTOBOTIA CURTA) BETWEEN RIVERS AND FLOOD AREAS: POSSIBLE GENERAL TRIGGER FOR FISH MIGRATIONS IN RIVERS Abe, T., Soma, Y., Kobayashi, I., Kon, M., and Sakamoto, T. Symposium: Stress Effects and Response Presentation: Oral Contact: Tsukasa Abe, Ushimado Marine Laboratory, Graduate School of Natural Science and Technology, Okayama University, 130-17, Kashino, Ushimado, Setouchi, 701-4303, Japan Setouchi Okayama 701-4303 Japan Fish Biology Congress Abstracts 2 E-Mail: [email protected] Abstract: We have observed that kissing loach and some other freshwater fishes migrate from the main stream of rivers to spawn in flood areas. These flood areas are unstable and ephemeral, however, they contain few aquatic predators and a large amount of food suitable for the development of embryos/juveniles. The present study provides the first evidence that the spawning migration of kissing loach is stimulated by both rainfall and the subsequent rise in water level, as well as the new moon. Since similar observations have been reported for downstream migrations of salmonids, these stimuli may serve as general cues for migrations of fishes in rivers. Furthermore, the spawning of kissing loach is rigidly limited spacio-temporally after the formation of flood areas. Recently we have successfully demonstrated that changes in water quality directly induce migration and spawning behavior, suggesting some particular odoriferous substances may be the environmental proximate factors. EFFECTS OF SUBLETHAL CONCENTRATION OF DIAZINON ON PLASMA BIOCHEMICAL PROFILE OF THE AFRICAN CATFISH CLARIAS GARIEPINUS Adedeji, O.B., Symposium: Environmental Pollution Presentation: Oral Contact: B. Adedeji Olufemi, Faculty of Veterinary Medicine University of Ibadan, Nigeria Ibadan Oyo Nigeria E-Mail: [email protected] , [email protected] Abstract: Pesticides and drugs used in agriculture and veterinary medicine may end up in aquatic environments and bioaccumulate in the food chain, thus posing serious problems for fauna and human health. This study determined the acute effects of organophosphate pesticides on biochemical changes in the African catfish Clarias. gariepinus as a result of exposure to sublethal concentrations of diazinon. The values obtained from the experimental fish were comp aired with normal values and subjected to statically analysis. The results showed that acute effect of diazinon on plasma biochemistry varies. It causes significant increase in some enzymes, (p<0.05) CHE, LDH, blood glucose, plasma protein, K+ concentration and significant decrease, (p<0.05) in Ca2+ and P. This shows that plasma biochemical profile can be used to monitor pesticides toxicity in fish. Proper surveillance and environmental monitoring of pesticides is therefore recommended in aquaculture for fish health and food safety. EFFECTS OF DIAZINON ON BLOOD PARAMTERS IN THE AFRICAN CATFISH (CLARIAS GARIEPINUS) Adedeji, O.B., Adedeji, O.A., Adeyemo O.K., and Agbede S.A., Symposium: Environmental Pollution Presentation: Poster Contact: Olufemi Adedeji, Faculty of Veterinary Medicine University of Ibadan, Nigeria Ibadan Oyo Nigeria E-Mail: [email protected] , [email protected] Abstract: Effects of diazinon (aquatic pesticides pollutant) on cultured and wild African catfish (Clarias gariepinus) was assessed, based on results of acute toxicity tests and on a comparison of results of haematological examination of a control and an experimental group exposed to DiazintolR pesticide preparation (active substance 162mg.l-1of diazinon). The 96hr acute toxicity test was performed semistatically on the catfish . Examination of erythrocyte and leucocyte profile was performed on 16 control and 20 experimental specimens. The experimental group showed significantly lower values (p < 0.05) of erythrocyte count , haemoglobin content and haematocrit . Values of MCV, MCH and MCHC were comparable in both groups. There was a significant decrease in leucocyte count (p < 0.05). Changes in values of both the erythrocyte and leucocyte profile after exposure to diazinon-based preparation may be referred to disruption of haematopoiesis as well as to a decrease on non-specific immunity of the fish. BIODIVERSITY OF FRESHWATER FISHES OF MARATHWADA REGION FROM INDIA Ahirrao, S.D. Symposium: Contributed Papers Presentation: Poster Contact: Anand Manwar, dept of fisheries, shri shivaji college parbhani maharashtra 430401 india E-Mail: [email protected] Abstract: Marathwada is one of the important region of india with high fish production and large numbers of rivers,reservoirs,lakes and ponds. it plays imp role in indian economy as will as the economy of the present area by contrubuting share in the total fish production similarly it has a great fish diversity. in the present paper the ichthyofauna has observed for last five years and taxonomically identified and verious types of fishes such as food fishes,culurable fishes,migretory fishes,predatory fishes,weed fishes,thretened fishes larvaevorous fishes medicinal value fishes has been described in the present paper. Fish Biology Congress Abstracts 3 SOME OF REPRODUCTIVE PROPERTIES OF NEOGOBIUS CASPIOUS FROM THE SOUTH EAST COASTS OF THE CASPIAN SEA(GUILAN OFF SHORE-IRAN) Alinaghi,S.S.,Ali,S.,Shabanali,N.,Anni,Ch.,Bin Saad,Ch.,and Gholamreza.Gh. Symposium: Contributed Papers Presentation: Oral Contact: Gholamreza Ghasemzadeh, Ayatollah Taleghani Ave.,Ghaziyan,Anzali Port,Fisheries Departement of Guilan province, Anzali Guilan 166 Iran E-Mail: [email protected]
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