Ignore The 'Just 3 Knives' Rule If You Eat A Lot Of Fish - Tasting Table
Briefly

Home cooking doesn't require an extensive set of knives; typically only a few are essential. A chef's knife, a serrated blade, and a paring knife cover most cooking needs. For fish preparation, a fillet knife is necessary due to its flexibility, allowing for precise cutting. Home cooks can buy whole fish like salmon and fillet them as desired with the right tools, enabling exploration of various cuts not found in local markets.
A fillet knife stands out from the rest of the knives in your collection primarily in how the blade is crafted. Those other three knives all have stiff, straight blades, which make them perfect for chopping, slicing, and crushing ingredients. But for the delicate work of breaking down a fish - separating the fillets from the body and removing the skin from those fillets - you need flexibility.
Home butchery is not something that even the most dedicated culinarians take on themselves - aside from something like breaking down a chicken. But this is not the case when it comes to fish.
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