What metaphors are used in Feeding the Moonfish by Barbara Wiechmann?

Much of the narrative can be seen as a metaphor for the forces of nature. Martin, Eden, and the moonfish are all significantly connected by forces of nature. The moonfish, as explained by Martin, come out at night, drawn to the moon by an unseen force to feed at the edge of the docks: "The moon's got a force, an it pulls and pulls at the insides of these fish. . . . All they got is moon minds." Forces seem to be at work within Martin as he is captivated by the beauty of the fish and their ability to stir within him fond memories of his father. Eden acknowledges these forces working in humankind and declares to Martin that there are forces guiding both their lives.