Crustacean muscle contains high concentrations
of free amino acids, particularly glycine, proline,
arginine, glutamate and alanine.19–22 In the study,
higher concentrations of these amino acids were
found in the muscle extracts of samples reared in
sea water versus those cultured in low salinity
water. The effect of environmental salinity on the
free amino acid composition and concentration in
penaeid shrimp has also been examined.9 Rapid
and qualitatively important adjustments are necessary
for osmoregulation in crustaceans following
changes in environmental salinity.23