|1. A raft for hydroponics comprising:
a plurality of opaque raft segments, each segment comprising a plurality of plant holes therethrough, at least one of said
plant holes having a narrower bottom dimension than a top dimension, said raft segments reversibly attached together to form
a raft to completely cover the surface of a pond, at least one of said segments having a plurality of thermal chimneys arrayed
diagonally surrounding a plant hole, at least one of said thermal chimneys having a wider bottom dimension than a top dimension:
one or more attachment devices to reversibly secure a raft segment to an adjacent raft segment with no gaps between them.