The salinity of the fluid can be calculated from the final melting temperature (Tm) which is when the last solid (ice) melts.
(The salinity of the fluid; can be calculated; from the final melting temperature) (the final melting temperature; is; when the last solid (ice) melts)
The salinity of the fluid the final melting temperature
can be calculated is
from the final melting temperature
when the last solid (ice) melts