ocean_mass_content_of_demersal_fish_expressed_as_wet_weight g m-2 [UGMS] "Content" indicates a quantity per unit area. The phrase "expressed_as" is used in the construction "A_expressed_as_B", where B is a chemical constituent of A. It means that the quantity indicated by the standard name is calculated solely with respect to the B contained in A, neglecting all other chemical constituents of A.