Smoked Fish: Types, Production Process, and How to Choose the Best

Smoked fish is one of the most prized ingredients in the gourmet pantry, but also one of the most misunderstood. The difference between exceptional and mediocre smoked fish is enormous, and it's not always easy to identify it on the supermarket shelf or in an online product description. This guide explains everything you need to know: what types of smoked fish exist, how the smoking process works (and why it matters), what signs to look for to choose a quality product, and how to use each type in cooking.

What smoking is and what it's for

Smoking is one of humanity's oldest food preservation and preparation techniques. It involves exposing food, previously cured in salt or brine, to smoke generated by the slow combustion of aromatic woods and plants. Smoke contributes three things to the product: flavor and aroma, antibacterial action (phenolic compounds in smoke inhibit microbial growth), and, in the case of hot smoking, heat treatment that extends the product's shelf life.

In fish, smoking has an additional effect: smoke compounds interact with fish proteins and fats, creating new aromatic molecules that do not exist in raw fish or fish cooked in other ways. This is what makes smoked salmon taste different from grilled salmon even if both start from the same fish: smoking creates a genuinely new flavor profile.

The two fundamental types of smoking: cold and hot

The most important distinction in fish smoking is between cold smoking and hot smoking. These are two distinct processes that produce completely different results.

Cold smoking

In cold smoking, fish is exposed to smoke at a temperature between 20 and 30 degrees Celsius, never exceeding 35 degrees. At these temperatures, the fish proteins do not denature (the fish does not "cook") and the product maintains a raw, soft, and moist texture.

Cold-smoked salmon is the most common and most appreciated example of this process. The thin slices of cold-smoked salmon that we know as a typical appetizer and brunch ingredient are all made by cold smoking. The process typically lasts between 12 and 24 hours, with the fish exposed to smoke in a chamber where the temperature is precisely controlled.

Cold smoking requires top-quality raw material because there is no heat treatment to "correct" fish defects. A second-quality salmon cold-smoked remains so after the process. An exceptional salmon cold-smoked yields an exceptional product.

Hot smoking

In hot smoking, fish is exposed to smoke at temperatures between 70 and 120 degrees. At these temperatures, the fish cooks completely while being smoked. The resulting texture is similar to cooked fish: flaky, without the laminar softness of cold smoking.

Hot-smoked trout, hot-smoked mackerel, and smoked herring (kipper) are common examples of hot smoking. These products have a longer shelf life than cold-smoked ones and are used differently in cooking: to flake over salads, to incorporate into pâtés and creams, to cook in pasta.

The most important types of smoked fish

Smoked salmon

The undisputed king of smoked fish. Atlantic salmon (Salmo salar) of Norwegian, Scottish, or Irish origin is most frequently used for cold smoking. Its high intramuscular fat content (between 10 and 15% of its weight) makes it the ideal fish for cold smoking: the fat acts as a vehicle for the aromatic compounds of the smoke and as protection during the process, preventing the fish from drying out.

The differences between quality smoked salmon and industrial smoked salmon are considerable:

• Quality: premium salmon uses salmon raised in cold, low-density waters, with quality feed. Industrial salmon uses intensive farm salmon with a higher percentage of water and a lower percentage of fat.
• Smoking: artisanal uses noble wood chips (oak, alder, beech) for 12-24 hours. Industrial may use liquid smoke (a chemical extract) which is faster and cheaper but gives a superficial and artificial smoke flavor.
• Cut: artisanal is cut into slices by hand or with precisely controlled knives. Industrial is machine-cut into uniform slices but with more breakage.

In Bacalalo, you will find quality artisanal smoked salmon loins and convenient Dominguez 100g smoked salmon slices for daily use. For sushi or tartar type preparations, the 150g smoked salmon sashimi comes in the perfect thickness.

Smoked trout

Smoked rainbow trout (Oncorhynchus mykiss) is the second most common smoked fish in the Spanish pantry. It is mainly hot-smoked, which yields a flaky product with a milder, less fatty taste than salmon. Hot-smoked trout is classically used in pâtés, spreads, scrambled eggs, and salads where cold-smoked salmon would not work well due to its texture.

Smoked mackerel

Hot-smoked mackerel (Scomber scombrus) is a product of great gastronomic value that is underutilized in Spanish cuisine. With a higher omega-3 content than salmon, smoked mackerel has an intense, marine flavor that can be overpowering for unaccustomed palates, but in the right context (salads with acidic and fresh elements, on bread with mustard and gherkin) it is extraordinary. It is one of the most nutritious and lowest-cost products in the world of smoked fish.

Smoked herring (kipper)

Smoked herring or kipper is a classic British and Irish breakfast item that has a marginal presence in Spanish gastronomy but deserves more attention. Herring is cold-smoked or smoked in a combination of cold and hot, resulting in a product with an intermediate texture. Its flavor is intense, salty, and with characteristic smoky notes that make kipper an ingredient with its own character. With scrambled eggs and toasted butter, it's a combination that the British have known well for centuries.

Smoked eel

Hot-smoked European eel (Anguilla anguilla) is considered by many leading chefs to be the best smoked fish in the world. Its exceptionally high fat content (between 20 and 30%) makes it extraordinarily juicy even after the smoking process, and its flavor is incomparably rich and complex. Smoked eel is common in the Netherlands, northern Germany, and Japan (where it is known as unagi and is one of the most prized ingredients in sushi). In Spain, it is difficult to find but not impossible in specialized stores.

Smoked salmon from other species

In addition to Atlantic salmon, there are smoked salmon versions from other Pacific species:

• Keta salmon (chum): less fatty than Atlantic, with a milder flavor. Its roe (the premium Keta roe) is the most prized on the market.
• King salmon (chinook): the fattiest and largest. Its cold smoking produces the product with the richest flavor but also the highest price.
• Pink salmon: the least fatty and lowest priced. Its smoking yields a drier and less flavorful product than Atlantic.

The woods of smoking: how fuel changes flavor

The type of wood used to generate smoke is one of the factors that most influences the final profile of smoked fish, although it is one of the least known by the non-specialized consumer.

• Alder: the classic Scottish and Irish wood for smoked salmon. It gives a mild, slightly sweet smoke, with nutty notes. It is the historical reference for quality Scottish smoked salmon.
• Oak: more intense and complex smoke, with notes of vanilla and tannins. Widely used in meat smoking and some fatty fish. With salmon, it provides a more powerful and "old world" profile than alder.
• Beech: balanced and neutral smoke, widely used in Central European smoking traditions. It gives a clean smoke without dominant specific notes.
• Cherry or fruit wood: sweet and slightly fruity smoke. It gives the fish a more delicate and aromatic profile. Less common but highly appreciated in artisanal smoking.
• Liquid smoke: Not a wood but a chemical extract of smoke. Its use is indicative of low-cost industrial production. It gives a superficial smoke with a simplified aromatic profile that cannot compare to natural chamber smoking.

How to choose quality smoked fish: the practical guide

When buying smoked fish, these are the factors to evaluate:

The smell: the first sign

Good smoked fish smells of natural smoke: of wood, of home, of something that has body and roundness. Industrial smoked fish smells of "chemical smoke": a flat, pungent, artificial note that lacks the complexity of real smoke. If the first smell you perceive is chemical or artificial, it is an indicator of low quality.

The color: natural vs artificially colored

Quality smoked salmon has a natural orange-pink color, with variations between pieces and clearly visible streaks of white fat. Industrial salmon tends to have a uniform and bright orange-red color that betrays the use of food colorings (excess synthetic astaxanthin). Homogeneous color is suspicious: natural salmon has variations.

The texture: firm, not sticky

A slice of quality smoked salmon has a certain firmness: it maintains its shape when lifted, it doesn't bend limply or fall apart into fibers. The surface should be slightly moist but not sticky. A sticky texture can indicate excess moisture (lower quality salmon with more water content) or spoilage.

The ingredients on the label

The label of good smoked salmon should have few ingredients: Atlantic salmon, salt, and possibly a small amount of sugar for curing. The best artisanal smoked products have literally two or three ingredients. If the ingredient list includes several additives (E-xxx), multiple preservatives, or "smoke flavor," it is a lower-quality industrial product.

The origin of the salmon

Norwegian, Scottish, and Irish salmon are the reference origins for quality smoked salmon. Chilean salmon is from larger industrial production and generally of lower quality in fat and flavor for smoking. Organic aquaculture salmon or salmon from clean, cold waters yields a superior product to that from intensive farms.

How to store smoked fish at home

Smoked fish is a semi-perishable product that requires refrigeration. Basic guidelines:

• Unopened, in the refrigerator between 0 and 4 degrees Celsius, until the indicated expiration date.
• Once opened, consume within 2-3 days. Smoked salmon exposed to air begins to oxidize and lose its aromatic smoke notes.
• Do not leave smoked salmon at room temperature for more than 2 hours (general rule for seafood products).
• Unopened cold-smoked salmon can be frozen for up to 2-3 months if indicated by the manufacturer. Always thaw in the refrigerator, never at room temperature.

Smoked fish in cooking: uses by type

Each type of smoked fish has its optimal uses according to its texture and flavor profile:

• Cold-smoked salmon: canapés, toasts, cold salads, tartares, carpaccios, cold pasta, brunch.
• Hot-smoked trout: pâtés, spreads, scrambled eggs, hot pasta, quiches.
• Hot-smoked mackerel: salads with acidic elements (citrus vinaigrette), on dark bread with mustard, flaked into stews.
• Smoked herring (kipper): Scottish or British breakfast with eggs, in cream and potato casseroles.
• Smoked eel: in sushi and sashimi, on toast with coarse-grain mustard, in warm potato salad.

Frequently asked questions about smoked fish

Is smoked fish raw fish?
It depends on the type. Cold-smoked salmon (the usual type for appetizer slices) is technically not cooked: its proteins have not been denatured by heat. However, the combination of salt and smoke makes it microbiologically safe for most people. Immunocompromised individuals, pregnant women, or people with at-risk conditions should consult their doctor. Hot smoking does involve complete cooking and is equivalent to cooked fish.

Why does smoked salmon sometimes "sweat" water in the package?
The liquid that appears in the package is normal: it is part of the salmon's cellular fluid that is released during storage. Excessive liquid can indicate salmon with higher water content (lower quality) or that the product has been subjected to temperature changes. A little liquid is normal; a lot of liquid is a sign of low-quality industrial product.

Does smoked salmon have more calories than fresh salmon?
Cold-smoked salmon has a caloric profile similar to fresh salmon: approximately 160-180 kcal per 100g. The smoking process does not add significant calories. What it does add is sodium: the curing before smoking significantly raises the salt content compared to fresh salmon.

How long does smoked salmon last once opened?
2-3 days in the refrigerator, well wrapped. Spoilage of smoked salmon is not always visible: the first indicators are smell (it loses smoky notes and acquires an acidic or rancid smell) and texture (it becomes sticky or very soft). If you have doubts about whether the salmon is still good, discard it.

Find the best smoked fish at Bacalalo

At Bacalalo, since 1990, we have been selecting smoked fish with the same criteria we apply to all our products: verified origin, artisanal or semi-artisanal production, no artificial additives, and a flavor profile that justifies the purchase.

Explore our smoked salmon collection with formats that best suit each use: the whole loin for recipes and high-level platters, the 100g slices for daily use, and the 150g sashimi for tartar or sushi type preparations. And complete the experience with premium Keta salmon roe for the final touch of luxury that many dishes deserve.