The content of bone fragments in minced carp flesh was determined by chemical method. A 100 g sample of cooked burgers from the FBSM lot was added to 2000 ml of 3 M urea containing 0.02 M NaOH. The suspension was stirred during overnight at 36 °C, using a magnetic stirrer and a hot plate. Afterwards, the bones were recovered by pouring off the basic urea solution. For the RBM lot, the same procedure was applied.