How to Salt Cod Fish (Bacalao) – Step-by-Step Curing, Storage & Rehydration Guide

by Oleg Nikitenko February 28, 2025

The Ultimate Guide to Salting Cod Fish (Bacalao) – A Timeless Preservation Method

Salting cod fish is a centuries-old preservation technique that enhances flavor, texture, and shelf life, making it a staple in global cuisines. Whether you’re a seasoned chef or a home cook, mastering this technique will unlock a world of culinary possibilities.

In this guide, we’ll cover everything you need to know about salting cod, from selecting the right fish to storing and rehydrating it for delicious dishes.

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1. Why Salt Cod Fish?

Salting cod fish not only preserves it but also enhances its taste and texture, making it ideal for traditional dishes like Bacalhau à Brás (Portugal) and Bacalao a la Vizcaína (Spain). Before refrigeration, salting was the primary method of preserving fish for long sea voyages and trade – a technique that shaped global cuisine for centuries.

Benefits of Salting Cod Fish

✔ Preservation – Extends shelf life without refrigeration – properly salted and dried cod can last for months or even years at room temperature.
✔ Concentrated Flavor – Removes moisture through osmosis, concentrating and enhancing the fish’s natural umami-rich taste.
✔ Firm Texture – The curing process firms the flesh, making it ideal for baking, frying, and stewing – it holds its shape better than fresh cod in long-cooked dishes.
✔ Versatility – Rehydrated salt cod can be used in hundreds of traditional recipes across Portugal, Spain, Italy, the Caribbean, and beyond.

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2. Selecting the Perfect Cod for Salting

Choosing the right cod is crucial for achieving the best results. The quality of your salt cod is entirely dependent on the quality of the fish you start with.

✔ Fresh Cod: Look for firm, translucent flesh with a fresh, clean sea scent – avoid any fish with a strong ammonia or sour odor.
✔ Dried Cod: Should be free from discoloration, mold, and off-odors – a white to pale yellow color is normal; dark spots indicate spoilage.
✔ Best Variety: Atlantic Cod is the traditional choice for bacalao due to its mild flavor and flaky texture. Pacific Cod is an excellent sustainable alternative with very similar results.
✔ Thickness: Thicker fillets (1–1.5 inches) produce the best salt cod – thin fillets can become overly salty and dry.

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3. How to Salt Cod Fish (Step-by-Step Guide)

Follow these simple steps to prepare and cure your own salt cod at home.

Preparing the Fish for Salting

Cleaning: Rinse cod under cold water to remove surface impurities. Pat completely dry with paper towels – excess moisture dilutes the salt cure.
Deboning: Use a sharp boning knife to remove the backbone and large pin bones. Run your fingers along the flesh to feel for any remaining bones and remove with fish tweezers.
Filleting: Cut into even-sized pieces (ideally 4–6oz portions) for uniform curing – uneven pieces will cure at different rates.

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The Salting Process

Ingredients & Tools:

Fresh Pacific or Atlantic cod fillets
Coarse sea salt or kosher salt – avoid iodized salt (the iodine reacts with the fish proteins and causes a metallic, bitter taste)
Non-reactive container (ceramic, glass, or food-grade plastic – never metal, which reacts with salt)
Wire rack or cheesecloth (optional, for air-drying after salting)

Instructions:

Salt-to-Fish Ratio: Use 1 part salt to 3 parts fish by weight (approximately 33% salt by weight of fish). This is the minimum for preservation; traditional recipes sometimes use up to 50% salt for longer shelf life.
Layering: Spread a generous layer of salt on the bottom of your container. Arrange a layer of fish skin-side down, then cover completely with salt. Repeat – salt, fish, salt – until all fish is fully covered. The top layer should be salt.
Curing: Refrigerate for 24–48 hours for a lightly salted cure (best for immediate use). For traditional long-preservation salt cod, cure for 5–7 days and then air-dry. Turn fish once or twice during curing and drain any accumulated liquid.
Rinsing: After curing, rinse under cold running water for 1–2 minutes to remove surface salt. The fish will have firmed significantly and reduced in size as moisture is drawn out.

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4. Storing & Rehydrating Salted Cod Fish

Once salted, proper storage ensures long-lasting quality.

Storage Tips

✔ Refrigeration: Store in an airtight container for up to 1 month – place a layer of parchment paper between the fish and the container lid to absorb any moisture.
✔ Freezing: Wrap tightly in plastic wrap, then place in a freezer-safe bag with air removed. Store for up to 6 months. Thaw overnight in the refrigerator before rehydrating.
✔ Traditional dry storage: Fully dried salt cod (dried until hard) can be stored at cool room temperature for months – wrap in cheesecloth and keep in a cool, dark, well-ventilated place.

How to Rehydrate Salted Cod

Soak in cold water for 24–48 hours – the soaking time depends on how heavily salted and how thick the fish is. Taste a small piece after 24 hours to gauge saltiness.
Change the water every 6–8 hours to remove excess salt – use cold water throughout; warm water can begin to cook the fish and affect texture.
Pat dry before cooking – the rehydrated cod should be plump, pliable, and mildly salty (not aggressively salty). It is now ready to use in any recipe calling for salt cod.

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5. The History of Salted Cod – A Portuguese & Norwegian Tradition

Salted cod has played a major role in global trade and cuisine for centuries. It was one of the most important commodities in the Atlantic trade economy from the 15th through 19th centuries, fueling exploration and feeding populations across Europe, Africa, and the Americas.

📍 Portugal: Known as “bacalhau”, salted cod has been a staple since the Age of Exploration (15th century), when Portuguese sailors preserved cod for long voyages. Portugal is said to have over 365 bacalhau recipes – one for every day of the year. Famous dishes include Bacalhau à Gomes de Sá and Bacalhau com Natas.
📍 Norway: Called “klippfisk” (cliff fish), Norwegian fishermen traditionally salted and dried cod on coastal rocks, making it an exported delicacy across Europe. Norway remains one of the world’s largest exporters of salt cod today.
📍 Caribbean & West Africa: Salt cod arrived via the Atlantic trade routes and became deeply embedded in local cuisines – Jamaica’s national dish (Ackee & Saltfish) and West African salt fish stews are direct legacies of this trade.

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6. Popular Salted Cod Dishes Around the World

Portugal

✔ Bacalhau à Gomes de Sá – Salt cod with onions, potatoes, hard-boiled eggs, and olives – one of Portugal’s most beloved comfort dishes.
✔ Bacalhau com Natas – Baked salt cod with a rich cream sauce and thinly sliced potatoes – a Portuguese holiday classic.

Spain

✔ Bacalao a la Vizcaína – Salt cod in a rich tomato and red pepper sauce from the Basque Country – one of Spain’s most iconic seafood dishes.
✔ Esqueixada – Catalan salt cod salad with tomatoes, onions, olives, and olive oil – served raw after rehydration.

Italy

✔ Baccalà alla Vicentina – Slow-cooked salt cod with milk, onions, and anchovies from the Veneto region – traditionally served with polenta.
✔ Baccalà Mantecato – Whipped salt cod with olive oil and garlic, served on crostini – a Venetian cicchetti classic.

Caribbean

✔ Saltfish & Ackee – Jamaica’s national dish – salt cod sautéed with ackee fruit, onions, tomatoes, and Scotch bonnet peppers.
✔ Buljol – Trinidad & Tobago’s salt cod salad with tomatoes, onions, peppers, and avocado – typically served at breakfast.

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7. Frequently Asked Questions About Salting Cod Fish

How long does it take to salt cod fish?

For a light cure (best for immediate use), salt cod takes 24–48 hours in the refrigerator, depending on the thickness of the fillets. Thicker fillets (1–1.5 inches) need the full 48 hours; thinner pieces may be ready in 24 hours. For traditional long-preservation salt cod (the kind used in bacalhau recipes), the fish is cured for 5–7 days and then air-dried until hard – this can take an additional 1–2 weeks depending on humidity and airflow. The longer and drier the cure, the longer the shelf life and the more concentrated the flavor.

Can I use iodized salt for salting cod fish?

No – it’s strongly recommended to use non-iodized salt such as coarse sea salt or kosher salt. Iodine reacts with the proteins and natural compounds in fish, causing a metallic, bitter taste and can also affect the color of the cured fish. Coarse sea salt is preferred over fine salt because it draws moisture out more slowly and evenly, producing a better texture. Avoid table salt (fine iodized) and flavored salts. Pure kosher salt (Diamond Crystal or Morton) is an excellent and widely available option.

What are the best ways to cook rehydrated salted cod?

Rehydrated salt cod is extremely versatile. Baking – works beautifully in gratins, casseroles, and dishes like Bacalhau com Natas. Frying – salt cod fritters (bolinhos de bacalhau) are a beloved Portuguese and Brazilian snack. Boiling or poaching – gently simmered in water or milk for 10–15 minutes, then flaked for salads and pasta. Stewing – added to tomato-based or cream-based sauces for dishes like Bacalao a la Vizcaína. Raw after rehydration – used in Catalan esqueixada salad. The key is to taste the fish after rehydration and adjust any additional salt in the recipe accordingly – rehydrated cod retains some saltiness.

Can I freeze salted cod fish?

Yes – salted cod freezes well. Wrap each piece tightly in plastic wrap, then place in a freezer-safe zip-lock bag with as much air removed as possible. Store for up to 6 months in the freezer. To use, thaw overnight in the refrigerator – never at room temperature. After thawing, proceed with the normal rehydration process (24–48 hours in cold water, changing every 6–8 hours). Note that freezing and thawing may slightly soften the texture of the salt cod compared to fresh-cured, but the flavor is largely unaffected.

What is the difference between salt cod and stockfish?

Salt cod is cod that has been preserved by salting – the salt draws out moisture and inhibits bacterial growth. It requires rehydration before cooking (24–48 hours in cold water). Stockfish (Norwegian: tørrfisk) is cod that has been preserved by air-drying without salt – hung on wooden racks in cold, dry Arctic air for 2–3 months until rock-hard. Stockfish requires much longer rehydration (up to 7–10 days) and has a more intense, concentrated flavor. Klippfisk is the Norwegian term for cod that is both salted AND dried – the most shelf-stable form. All three are used in traditional bacalhau and bacalao recipes, though salt cod is the most widely available in the US.

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Conclusion: Why You Should Try Salting Cod Fish

Salting cod fish is a timeless culinary tradition that enhances flavor, texture, and versatility. Whether you’re preparing classic Portuguese bacalhau, Spanish bacalao, or exploring new recipes, salted cod adds depth and complexity to your meals.

By following this guide, you’ll be able to salt, store, and rehydrate cod like a pro, bringing the rich heritage of bacalao to your kitchen.

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