| Option | Build | Best for | Downside |
|---|---|---|---|
| Deba 150-165 mm | Thick spine, single bevel, real mass | Whole aji, saba, tai — regular fish work | A specialist; clumsy at general cutting |
| Ko-deba 105-120 mm | Same idea, compact | Small fish; beginners' whole-fish practice | Undersized for a big tai |
| Santoku substitute | Thin all-purpose edge | The occasional whole fish | Heads and bones chip thin edges |
| Fishmonger does it | No knife needed | Whole-fish flavor without the work | Depends on the counter's time and skill |
Do You Need a Deba Knife?
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Photo: Jakub Kapusnak CC0 1.0 Source
Only if whole fish come home with you — a deba exists to take the head off and fillet along the bones without flinching. If your fish arrives as fillets, this knife has no job in your kitchen.