Not to say the fish don't have a Christian association, only to add that the symbol predates Christianity by a couple of thousand years. It is found in the Chaldee/Babyonian tradition (Dagon the Fish God - half man, half fish) as well as the Brahman tradition. I've taken this excerpt from Blavatsky's Isis Unveiled:
"In the Hari-purana, in the Bagaved-gitta, as well as in several other books, the god Vishnu is shown as having assumed the form of a fish with a human head, in order to reclaim the Vedas lost during the deluge. [Yes the same Flood] Having enabled Visvamitra to escape with all his tribe in the ark, Vishnu, pitying weak and ignorant humanity, remained with them for some time. It was this god who taught them to build houses, cultivate the land, and to thank the unknown Deity whom he represented, by building temples and instituting a regular worship; and, as he remained half-fish, half-man, all the time, at every sunset he used to return to the ocean, wherein he passed the night.
"It is he," says the sacred book, "who taught men, after the diluvium, all that was necessary for the their happiness.
"One day he plunged into the water and returned no more, for the earth had covered itself again with vegetation, fruit, and cattle.
"But he had taught the Brahams the secret of all things" (Hari-Purana).
So far, we see in this narrative the double of the story given by the Babylonian Berosus about Oannes, the fish-man, who is no other than Vishnu - unless, indeed, we have to believe that it was Chaldea which civilized India!"
From this perspective, Palehorse, we see better the connection to Kundalini I think. Oannes/Vishnu returns to the sea to become Leviathan the serpent, forever seeking and being denied entrance into Heaven. Your cobra consuming the fish is a good analogy I think.
Just some fodder for thought...
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