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KOPP, R., MARES, J., LANG, S., BRABEC, T., ZIKOVA, A.: Assessment of ranges plasma indices in rainbow trout (Oncorhynchus mykiss) reared under conditions of intensive aquaculture. Acta univ. agric. et silvic. Mendel. Brun., 2011, LIX, No. 6, pp. 181–188 Plasma parameters in rainbow trout (Oncorhynchus mykiss) from three various trout farms in the Czech Republic were assessed using automated blood plasma analyser. Non-haemolysed serum from the heart of 48 healthy, randomly selected fi sh (standard length, mean ± SD = 247.3 ± 24.2 mm; body mass, mean ± SD = 262.18 ± 87.28 g) was analysed for the following plasma parameters: alanine aminotransferase, aspartate aminotransferase, alkaline phosphatase, acid phosphatase, lactate dehydrogenase, creatine kinase, total protein, cholinesterase, amylase, glucose, lactate, albumin, urea, cholesterol, triglycerides, lipase, Ca, Mg, P, Fe, Na, K and Cl. All data were analysed statistically such as normality assessment by means of Kolmogorov–Smirnov test and adequate statistical testing using various parametric and non-parametric tests for each variable. With regard to data distribution, 19 indices out of 23 (aspartate aminotransferase, alkaline phosphatase, acid phosphatase, lactate dehydrogenase, total protein, amylase, glucose, lactate, albumin, urea, cholesterol, triglycerides, Ca, Mg, P, Fe, Na, K and Cl) were normally distributed. The indices were aff ected by handling time and, accordingly to the physical and chemical properties of water. Estimates obtained were compared with previously reported ranges. The blood automated analyser proved to be a valuable and reliable instrument for the estimation of plasma parameters determining normal ranges in rainbow trout. fi sh, biochemical variables, aquaculture Development of intensive aquaculture requires that examination of the state of health of fi sh should also include approaches that involve clinical biochemical diagnostics. Such approaches serve to identify in an early stage the onset of any organ failure caused by the use of wrong feeds and to draw attention to changes in the abiotic factors of the environment and to any complications due to an infection or parasitic invasion. To identify as many pathological deviations as possible, it is advisable to use more than one test refl ecting the basic metabolic functions (Řehulka and Minařik, 2008). Control of the physiological state of the rainbow trout, focused on biochemical examinations of the blood plasma, is an integral part of the complex methods of examining the health of the fi sh and at the same time, plays a role in feeding experiments – in testing diets of diff erent composition or testing the properties of substances having a specifi c eff ect (Řehulka and Minařik, 2001). Fish blood plasma chemistry is a promising area in fi sh biology and clinical pathology although it requires further research particularly in assessment of normal ranges. Diffi culties due to establishing normal estimates for rainbow trout Oncorhynchus mykiss (Walbaum) have been emphasized by many authors (Wedemeyer and Chatterton, 1970; McCarthy et al., 1973; Wedemeyer and Nelson, 1975; Meade and Perrone, 1980; Hille, 1982; Roscoe Miller et al., 1983). Moreover, apart from the inevitable diff erences in, 182 R. Kopp, J. Mares, S. Lang, T. Brabec, A. Zikova e.g. methodology, fi sh size and strains, season and physiological condition, it is o en diffi cult to fi nd an exhaustive set of blood chemistry estimates for rainbow trout in a single study (Manera and Britti, 2006). The aim of the present study was to assess plasma parameters in rainbow trout (Oncorhynchus mykiss) from aquaculture system. Fish health status was accurately assessed by accurate necropsy to avoid including fi sh with subclinical pathologies that could aff ect the estimates. MATERIALS AND METHODS