DrWatson
Some odd comments on here! "No working freezer" -- well, simple solution. "Fish stinks the fridge"? If you don't use all the contents, put them into a plastic storage box - - they come with a tight lid -- and label when you did that. Or use cling film over the original tin, you won't be leaving it weeks, will you? But some interesting points re tin openers.
So, if you need to freeze half a tin of salmon, just buy a freezer. Simples! 
Solution 2 only works if you still have the matching lids for your plastic containers and they still fit tightly.
Solution 3 your fridge will still smell of salmon long after the salmon has departed.