and δ15N for feces excreted from the red sea bream fed on extruded
pellets were 3.5‰and 3.3‰reduced relative to the feed, respectively.
Based on this result, the δ13C and δ15N values of fish feces at the fish
farm station were estimated to be −23.6‰ and 6.2‰, respectively
(Fig. 10). Other possible food sources have been analyzed in the previous
study conducted in Gokasho Bay, therefore, literature δ13C
and δ15N values (mean±SD),