The body is compressed and covered with very large scales. The lower jaw juts out and up. The teeth are small and fine, and the throat is covered by a bony plate. The dorsal fin consists of 12 16 soft rays (no spines) the last of which is greatly elongated. The back is greenish or bluish varying in darkness from silvery to almost black. The sides and belly are brilliant silver. Inland, brackish water tarpons frequently have a golden or brownish color because of tannic acid.