The poem opens with a small, strange discovery: a fin showing through old snow, so lifelike it seems like a real fish. The title, "Piscine," which means "of fish," points us toward that image. The word "life-like" suggests the fish may not be alive at all, only something that looks like life, half buried and still.
Then the speaker turns inward with a blunt statement: "I am my papers." Identity here is reduced to documents, records, and paperwork. The comparison to a house "where there was but one supper" is quietly sad. It suggests a place that holds only a single remembered meal, a life that has left little behind except traces.
The mood is cold, spare, and a little lonely. The speaker doesn't explain the link between fish and self, but the poem seems to suggest that both are preserved shapes, convincing on the surface and emptied of the living thing inside. Judging by the imagery, the feeling is one of quiet resignation rather than loud grief.