The most significant difference between people and fish is only skin deep. We humans are covered in a thick sheath of dead cells, while the outermost layer of the fish is composed of living, slime-secreting cells.
Most scientists wave away the difference as an outcome of our terrestrial lifestyle. Cells require an aqueous environment to live in, so our skin acts as a wrapper, keeping the wet stuff in. Fish cells secrete slime, so the story goes, to lubricate themselves against the water, protect from microbes and form a tight waterproof seal around themselves.
But a different idea, originally proposed by Aldous Huxley has, to my knowledge, never been given full consideration by biologists. In
The Perennial Philosophy, Huxley argues that slime substitutes for spiritual distance from the Divine Presence.
The slime of personal and emotional love is remotely similar to the water of the Godhead's spiritual being, but of inferior quality and (precisely because the love is emotional and therefore personal) of insufficient quality. Having, by their voluntary ignorance, wrong-doing and wrong being, caused the divine springs to dry up, human beings [Here, of course, he means to include fish. -Ed.] can do something to mitigate the horrors of their situation by "keeping one another wet with their slime" [He's quoting Chuang Tzu, a Taoist - Ed.
To my mind then, the slime that oozes from the integument of the fish is no mere physical barrier, but serves a lofty spiritual purpose. It is for self-love, a narcissism made necessary by their choice of an amoral lifestyle which distances them from the Universal Compassion.
NIH funding is tight, I thought I'd try that one out here first.