So I just watched Shape of Water (2017), and I have a question... okay, I have a lot of questions, but this one disengaged me from the movie the most:
Why did the Asset/Fishman need salt to be put in his water to make it "habitable"? Early in the film, they say the Fishman was found in the Amazon, likely the deeper inland regions. The Amazon, like most rivers, is fresh water, not salt water - in fact, the Amazon discharges so much fresh water into the ocean that it dilutes the ocean's salinity for 100 miles past the delta.
So why this insistence on keeping the Fishman's water so thoroughly salted? It appears to work at first, and then he starts dying for some reason towards the end, so is this del Toro trying to show how much the scientists don't understand about this creature, or just him trying to show how much he doesn't know about science?