Effects of lipid extraction on stable isotope ratios of carbon and nitrogen in muscles of freshwater fish.

The extraction of lipids by the Folch method from the muscles of all the fish studied led to statistically significant differences in the values of N. At the same time, lipid extraction led to a statistically significant increase in C in pike and roach, and to a statistically insignificant decrease in C in perch and bream. Thus, lipid extraction cannot serve as a universal method of sample preparation for the analysis of the isotopic composition of carbon (C/C) and nitrogen (N/N) in fish muscles.