Song of Salmon 2:13 is a beautiful expression of poetic love which makes use of various metaphors. The author, known only as "Salmon," is not clearly identified in any other way, making him effectively anonymous. Scholars believe Salmon wrote this after an especially grueling trek back to his native spawning grounds—a journey on which most of his family was eaten by bears.
Being written a fish, it's clear that most of the references in this verse are symbolic, such as trees, figs, and vines. What's not likely to be metaphorical is the concept of fragrance, which—let's be honest—is something fish know all too well.
One would be swimming upstream to attempt to net any more meaning from Song of Salmon 2:13. Being a metaphor, it's already a hard roe to hoe. With the scales tipped as they are, rather than getting green in the gills, it's best to flop over to something like the
Song of Solomon, which is easier to reel in.