A stainless Mora may have been fine. Actually the carbon Mora would have been okay if it had been cleaned and dried rather than being put away wet. Salmon blood and salt water are a bad mix for a carbon blade.
Sorry for your loss.
Having been a lifelong fisherman, I am very well aware of saltwater marine environments and the effects it can have on a carbon blades... This was a small mistake of leaving the knife in that environment.
No need to be sorry, it is not like I lost my best friend or anything. One of the great qualities of Mora knives is that they are cheap to replace.
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Earth and sky, woods and fields, lakes and rivers, the mountain and the sea, are excellent schoolmasters, and teach some of us more than we can ever learn from books.
John Lubbock