Deba

A thick, heavy single-bevel knife used specifically for breaking down whole fish — cutting through bone and separating fillets — distinct from the thinner blades used for pure slicing.

Material & Construction

A thick, heavy steel blade with a single bevel edge, providing the strength needed to cut through fish bone without chipping a thinner blade.

Traditional Uses

Breaking down whole fish: removing heads, cutting through the spine, and separating fillets, a specialized task distinct from the fine slicing done afterward with other knives.

Modern Availability / Equivalents

A sturdy boning knife covers a similar function outside dedicated Japanese kitchen contexts, though without matching the deba's specific weight and single-bevel geometry.

Care & Maintenance

Hand-wash and dry immediately; single-bevel Japanese knives require specific sharpening technique to maintain the asymmetric edge correctly.