For what it's worth, the term "fresh water" has each of those separate connotations in American English too, and it can be just as context-dependent. Both "These fish belong in fresh water, not salt water" and "I put fresh water in the ice trays because the old stuff was stale" are valid contextually and linguistically.
Yes, but it does not necessarily have those two connotations in other languages (which is the issue here).
In Portuguese, if you want to say "fresh water" (as in, "low-salinity water"), you use the term "sweet water", rather than "fresh water" ("fresh water" can only be interpreted either as "cold water" or "non-stale water", but never as "low-salinity water").
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For what it's worth, the term "fresh water" has each of those separate connotations in American English too, and it can be just as context-dependent. Both "These fish belong in fresh water, not salt water" and "I put fresh water in the ice trays because the old stuff was stale" are valid contextually and linguistically.
Yes, but it does not necessarily have those two connotations in other languages (which is the issue here).
In Portuguese, if you want to say "fresh water" (as in, "low-salinity water"), you use the term "sweet water", rather than "fresh water" ("fresh water" can only be interpreted either as "cold water" or "non-stale water", but never as "low-salinity water").