Quick change in d15N values of fish mucus confirmed in the field using a migr…

Stable isotope analysis has been used in a number of studies to understand the food habitats, trophic positions and migration of fishes (Hobson 1999; Post et al. 2000), based on the stepwise enrichment of d13C and d15N values from prey to predators (DeNiro & Epstein 1978, 1981). However, the use of stable isotope ratios for studying dietary shifts in fishes has often been hampered by the slow…