Proteins

Dogfish

Small shark with firm white flesh, classic for Spanish cazón en adobo.

Dogfish is a small species of shark with firm, boneless white flesh. In Andalusia it is marinated in vinegar, garlic, and spices then fried as cazón en adobo, and in Britain it sometimes stands in for cod in fish and chips. Its dense texture holds up well to frying and marinating.

Dogfish is a small shark—typically 2–3 feet long—with dense, muscular white flesh that has anchored traditional cooking from Andalusia to the British Isles. The most commonly used species is the spiny dogfish (Squalus acanthias), named for the small spines at the base of its dorsal fins that require care when handling. Its flesh is mild and clean with a subtle marine sweetness, denser than most white fish and muscular in a way that makes it forgiving in braises and stews while still flaking well under direct heat. The firm texture, combined with a relatively low price and good sustainability profile in many regions, has made dogfish a working-class staple rather than a luxury—it is the honest, reliable fish that feeds people well without ceremony.

The catch is freshness. Dogfish has high levels of urea and related compounds that break down rapidly after death, quickly producing ammonia—the single most important thing to know about this fish. A pronounced ammonia smell is a disqualifier: it cannot be cooked away, and no amount of milk-soaking or lemon will fix fish that has passed its window. Buy from a fishmonger you trust, use the same day, and never hesitate to smell before you buy. Beyond freshness, dogfish rewards simple treatment: the flesh has enough character to hold its own in bold marinades like Andalusian adobo, yet enough delicacy to disappear under heavy seasoning if you are not careful.

Geographically, dogfish goes by many names and wears many traditions. In Spain it is the cazón that defines the Andalusian snack cazón en adobo, fried in a spiced vinegar marinade. In Britain it is rock salmon or simply flake, the traditional fish-and-chips fish that generations of working people knew before it fell out of fashion. In Australia, "flake" technically refers to gummy shark, but dogfish and related species are frequently substituted under the same name. Understanding these names unlocks a genuine transatlantic culinary lineage: the same firm, mild shark feeding working-class tables from Cadiz to Cornwall to Cape Town.

Measured in: g
Storage: Fridge

Allergens

Fish

Types & varieties

Spiny dogfish

Squalus acanthias; the most widely used species; has small defensive spines at the dorsal fins; Atlantic and Pacific populations available year-round

Smooth dogfish

Mustelus canis (Atlantic) and M. californicus (Pacific); gentler texture and slightly less firm; no spines to worry about when handling

Cazón (Spain)

Regional Andalusian name for spiny dogfish; the canonical fish for cazón en adobo and other traditional Spanish preparations

Rock salmon (UK)

British term for dogfish, especially when sold for fish and chips; the historic chippy fish before it fell out of favor in some markets

Flake (Australia)

Common market name for gummy shark and related species sold as flake in Australian fish-and-chips shops

Why the firm texture matters

Dogfish flesh is built differently from most white fish. The muscle fibers run tight and dense, giving it a steak-like quality that can take handling that would destroy flakier fish. This is not a fish that needs to be coddled—soups, stews, and braises that would reduce cod to mush leave dogfish intact. This resilience made it a practical choice for traditional cuisines that valued keeping fish intact through long cooking. It also makes dogfish forgiving of uneven heat distribution in a pan or on a grill, though the corollary is that overcooking dries it out just as readily as any other fish. The key is understanding that the apparent sturdiness of the raw flesh does not mean it is immune to overcooking—the opposite, in fact, because dry dogfish becomes noticeably tough and dense.

Dense muscle structure = holds together in liquids; not immune to overcooking
Steak-like quality makes it forgiving of uneven heat if you pull it off early
The firm texture also means it needs less cooking time than you might expect from something so dense
Cuts with even thickness are essential because the density slows heat penetration unevenly

On freshness and ammonia

The urea and related nitrogen compounds in dogfish flesh break down post-mortem into ammonia gas, and this is the defining quality concern for the cook. Unlike many fish where a slight staleness can be masked, dogfish is not forgiving here. The moment you open a package and smell sharp ammonia, you have a fish that should go back. No marinade, no cooking method, no amount of lemon juice will correct it. Trust your nose. When you do get genuinely fresh dogfish—clean, mildly marine, with no hint of sharpness—the flesh is clean and pleasant. The practical implication is straightforward: establish a relationship with a fishmonger who moves product quickly, buy the same day, and cook immediately. If you cannot cook the same day, freeze it—properly wrapped and frozen at peak freshness, dogfish holds well for months.

Ammonia smell means the fish is spoiled; no cooking method fixes it
Ask your fishmonger to bleed and gut immediately after catch—blood left in the flesh affects flavor
Smell the fish before buying every single time, even from a trusted source
Fresh, properly stored dogfish smells clean and oceanic, with no sharpness

Common uses

Cazón en adobo — Andalusian marinated fried fish, the canonical preparation and the dish that defines Spanish dogfish cookingFish and chips — historically made with rock salmon in Britain and flake in Australia; the firm flesh holds together in hot oilGrilled or pan-fried steaks — seasoned with salt, lemon, and olive oil; sear over high heat and rest like a piece of meatFish stews and soups — the dense flesh holds together through long cooking without disintegrating or going mushyEmpanadas and savory turnovers — sturdy enough for dense, heavily seasoned fillings that would destroy a flakier fishCeviche — the firm texture means the flesh does not fall apart in acid; it cures evenly and holds its structureSmoked preparations — dense flesh absorbs and retains smoke well, taking on a deep, savory characterBraised in tomato, olives, and capers — Mediterranean braises that suit the mild flesh without overwhelming itSubstitute for skate wing in classical French preparations — same dense, mild, cartilage-attached structure in a more widely available package

Tips & pitfalls

Buy from a trusted fishmonger and use the same day; ammonia development is irreversible and cooking does not remove it
Ask the fishmonger to bleed and gut the fish immediately after catch—blood in the flesh clouds the flavor
Soak fillets in cold milk for 30–60 minutes before cooking to mellow any lingering fishiness and draw out residual blood
Pat thoroughly dry before cooking—surface moisture prevents proper searing and browning
Season simply: salt, lemon, olive oil, garlic. The mild flesh disappears under heavy seasoning
Do not overcook—dogfish is leaner than many sharks and dries out quickly, becoming tough
Remove the skin before cooking if you want a cleaner flavor; the skin can be tough and slightly bitter
Cook to 145°F / 63°C minimum to ensure food safety; check for parasites, which are less common in cold-water species
When buying steaks, ensure even thickness throughout for uniform cooking

Nutrition

No USDA FoodData Central match for Dogfish yet. We surface a per-100 g profile once a generic whole-food entry is matched and verified.

In the shops

Matched grocery products

No matched grocery products for Dogfish yet.

Good to know

Scientific name: Squalus acanthias (spiny dogfish); Mustelus species (smooth dogfish)
Flavor: Mild, clean white flesh with subtle marine sweetness; ammonia notes indicate spoilage that cooking cannot remedy
Texture: Firm, dense, and muscular; flakes well when cooked; holds together in liquids without disintegrating
Color: Off-white to pale gray flesh; dark gray-brown skin
Fat content: Lean for a shark; modest omega-3 content
Yield: Approximately 50–55% edible meat from whole fish
Shelf life: 1–2 days raw on ice; up to 3–4 months properly frozen
Mercury: Lower than many larger sharks due to small size and lower position in the food chain
Health note: Contains elevated uric acid; not recommended for people with gout

Substitutes

Skate wing — Similar firm, mildly flavored white fish with comparable density; slightly sweeter; the classical French reference point for dogfish-style preparations
Monkfish — Comparable density and mild, clean flavor; considered the luxury equivalent; significantly more expensive but an excellent swap for texture and taste
Hake — Firm white fish with similar mild flavor and good availability across Europe; slightly less dense but holds up well in most preparations
Wolffish — Firm, mild white flesh with a similarly muscular texture; sustainably sourced in many regions; an excellent one-to-one substitute in any application
Sea bass fillets — Similar clean, mild flavor profile; less firm than dogfish so it works better for gentle cooking methods than deep-frying
Cod — Less dense; acceptable for soups, stews, and braises but unsuitable for frying or applications that need structural integrity

Pairs with

Adobo (garlic, vinegar, paprika, oregano)Lemon and butterOlive oil and garlicCoconut milk and curryTomato, olives, and capersFennel and PernodGremolata

Also called

Cazon en Adobo · Cazón · Huss · Rock Salmon