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The second post says which fish are released from what password. Tip: if you are going for S ranked fish, it may not be a good idea to release some of them, as they are more common and interfere with "normal" fish (mainly talking about the Sailfish).
By the way, you posted the last in that topic...didn't you get all the passwords then?
Currently waiting for: Animal Crossing: New Leaf (June 9th!!)