in sea water were higher than those farmed in low
salinity water. The umami nucleotides in the
extract from shrimp cultured in sea water were
higher than those cultured in low salinity water,
which was also confirmed by the sensory evaluation
of the extract. Hayashi studied the nucleotide
components in the extract of boiled crab, and
found AMP was main constituents of nucleotide
and a small amount of ADP, UMP, CMP and IMP in
the extract.31