243 Bulletin UASVM, Veterinary Medicine 66(1)/2009 ISSN 1843-5270; Electronic ISSN 1843-5378 Researches on Fish Welafre Assessment in Fundulea - Frunzareni Farm, Based on Water Quality and Blood Biochemical Parameters Elena MITRANESCU 1) , Florin FURNARIS 1) , Aneta POP 1) , LaurenŃiu TUDOR 1) , Elena ROTARU 1) , Violeta SIMION 2) , Dragos MITRANESCU 3) 1) University of Agronomical Sciences and Veterinary Medicine Bucharest, Faculty of Veterinary Medicine, 105 Splaiul Independentei, District 5, Bucharest, ffurnaris@gmail.com 2) Spiru Haret University Bucharest, Faculty of Veterinary Medicine, 47 Masina de paine, District 2, Bucharest, viv_sim20004@yahoo.com 3) Penitentiaries General Department, Bucharest, 47 Maria Ghiculeasa Abstract. In order to exist, fish need an appropriate environment, which satisfy its biological necessities. The physical - chemical water conditions play an important role in aquatic organisms' evolution. In Fundulea - Frunzareni fish farm there were harvested water and blood samples. From water samples there were established the physical - chemical parameters as: pH, dissolved oxygen, ammonia, nitrates, nitrites, phosphates, residual chlorine, total ferrum, sulphates and detergents and from serum samples: blood urea nitrogen, creatinine, phosphorum, calcium, albumins, alanine transaminase, cholesterol, tryglicerids, glucose, lactate dehydrogenase. The samples, both water and blood serum, were processed in the Animal welfare discipline laboratory - Faculty of Veterinary Medicine Bucharest, using Nova 60 device for water samples and Vettest 8008 biochemistry analyzer for serum samples. Regarding water quality in Fundulea - Frunzareni fish farm it was found that water pH, dissolved oxygen, ammonia, nitrites, total ferrum and copper recorded values within the admitted limits for carp rearing. Phosphates exceeded the admitted limits provided for carp rearing by 1.5 times in the samples harvested from 3 m depth at the water supplying sector of the pond and by 4 times in rejection sector. Residual chlorine exceeded admitted limits by 6-13 times, depending on the sampling point and depth. Key words: water, fish, welfare, biochemical serum profile, blood, quality parameters INTRODUCTION Water has a major importance for fish's life by all its features: physical - chemical, organoleptical, biological, bacteriological and radioactive. It influences species ecological zonation, fish lifetime, production level, fish and fish products salubrity and last but not the least food safety. Fish welfare assessment could not be considered without an evaluation of its environment, respectively water from different fish ponds. Water chemistry has both direct and indirect influence upon fish by its impact upon bioagressor evolution and by causing discomfort, which may lead to stress. Another objective fish welfare indicator is the serum biochemical profile analysis, a very useful tool, considering the theoretical and practical issues bindings between biochemistry and its connected sciences, namely the depth of the biochemistry interdisciplinarity character.