Salmon sperm DNA is deoxyribonucleic acid derived from the sperm cells of salmon (typically species like Salmo salar, Atlantic salmon). It is a highly studied and widely used biological material due to its unique properties, including high purity, large quantity per cell, and structural stability. Unlike mammalian DNA, salmon sperm DNA is particularly rich in histones (proteins that package DNA), which contribute to its compact structure and ease of extraction.