Morphological indicators of body condition: useful or wishful thinking? -- Standard methods for destructive body composition analysis -- The isotope dilution method for the evaluation of body compostition -- Gas dilution methods: elimination and absorption of lipid-soluble gases -- The use of total body electrical conductivity (TOBEC) to determine body composition in vertebrates -- The use of bioelectrical impedance analysis (BIA) for estimation of body composition -- The assessment of body composition and other parameters by ultrasound scanning -- The use of dual-energy X-ray absorptiometry for the measurement of body composition.