The Complete Guide to Scottish Seafood Seasons

Scotland's seafood calendar is one of the richest in the world. From the langoustines that peak through the West Coast summer to the scallops that come into their own in autumn, from the mackerel that runs fat through the warmer months to the haddock and cod that settle into their best condition in late summer — buying Scottish seafood in season is one of the most straightforward ways to get better product at better prices.

This is the complete guide. Every species. Every season. What to buy when, what to avoid, and what it means for your business if you're a chef, a fishmonger, a chip shop or a wholesale buyer.

Why Seasonality Matters More Than Most Buyers Realise

Most wholesale buyers think about price. Fewer think about condition — the underlying quality of a fish at a given point in its annual cycle. The two are connected in ways that aren't always obvious.

Fish in peak condition — well-fed, firm-fleshed, healthy — tastes better, holds its texture through cooking, and gives better yields when filleted. Fish that's spawning or recovering from spawning is leaner, softer, and less flavourful. You can buy it — it's still fish — but it's not the same product as the same species bought three months earlier or later when conditions are right.

Buying in season means buying fish in peak condition. It also usually means buying fish when supply is highest — which pushes prices down. Seasonal buying is better quality at lower cost. The fishmonger who understands this runs a better counter. The chef who understands this runs a better menu. The chip shop owner who understands this manages their margin more effectively.

The Full Scottish Seafood Calendar

Haddock

Peak season: Late summer through autumn (August to November) Avoid: Spring spawning period (February to April) Year-round availability: Yes, but quality varies

Scotland's most important commercial fish. Haddock is available every week of the year from Scottish waters — it's a staple product, not a seasonal one. But quality varies significantly through the year.

The spring spawning period from February to April is when haddock are at their lowest condition — the fish divert energy into reproduction and the flesh becomes softer, less firm, and less flavourful. Experienced fryers notice this in how fillets behave in the oil. The batter doesn't adhere as cleanly. The flesh is more likely to fall apart.

From late summer through autumn, haddock that have fed well through the warmer months are at their firmest and best. This is the period when wholesale prices are often most competitive and quality is most consistent. Buy more in this period if your storage allows it.

For chip shops: Watch how your fillets behave through late winter and spring. If you're seeing softer, more inconsistent fish, it's seasonal — not necessarily your supplier's fault.

For fishmongers: Feature haddock prominently from late summer onwards when condition is best. Price it accordingly — you're offering a better product.

For restaurants: Whole haddock at peak condition in late summer and autumn is worth featuring as a seasonal item rather than just a year-round staple.

Cod

Peak season: Autumn and winter (September to February) Avoid: Spring spawning period (March to May) Year-round availability: Yes

Scottish cod follows a similar pattern to haddock — year-round availability with seasonal variation in condition. Autumn and winter cod that have fed well through summer are at their firmest and most flavourful. Spring cod recovering from spawning is softer and less interesting.

Scottish North Sea cod stocks have recovered significantly through responsible quota management over the past two decades. The cod available today from Scottish waters comes from healthier stocks than at any point in recent history — a genuine sustainability success story that's worth communicating to customers.

For chip shops: Cod performs best in the fryer through autumn and winter. If you offer both haddock and cod, autumn and winter is when cod is at its most competitive in quality terms.

For restaurants: Winter cod — particularly large, whole fish in excellent condition — is one of the finest things on a Scottish wholesale fish market in January or February. A simply cooked whole cod from Peterhead at this time of year is worth building a dish around.

Langoustines (Scottish Prawns)

Peak season: Late spring through summer (May to September) Reduced availability: October to April Year-round availability: Limited in winter

West Coast langoustines are Scotland's premium shellfish — the product that defines Scottish seafood on high-end restaurant menus across the world. Their season follows the activity patterns of the animals themselves.

Through spring and summer, langoustines are feeding actively in shallower water and are more catchable in the creels and trawls that harvest them. The animals are in peak condition — full of meat, sweetly flavoured, lively. This is the period of highest availability and — because supply is highest — often the best value.

Through autumn and into winter, langoustines move to deeper water and become less active. Catches fall. Prices rise. Quality remains good but availability tightens.

For restaurants and hotels: Feature langoustines prominently on your summer menu when they're at their best and most available. Simply prepared — halved and grilled, or live and steamed — they need nothing complicated. Let the product speak.

For fishmongers: Live langoustines are a counter highlight through summer. Customers who see live shellfish on a fishmonger's counter buy them. It's that simple.

Scallops

Peak season: Autumn through winter (October to March) Avoid: Summer spawning period (July to September) for dredged scallops Hand-dived availability: Longer season than dredged

Scottish scallops are at their best through autumn and winter. The animals build condition through summer and reach peak meat yield as the water cools — the roe is full, the flesh is dense and sweet. This is when hand-dived scallops are most impressive on a restaurant plate.

There is a closed season for dredged scallops in many Scottish Marine Protected Areas — typically through summer when animals are spawning and most vulnerable. Hand-dived scallops are available for a longer period and are not subject to the same closures in most areas, making them the better year-round option for restaurants and fishmongers who want consistent supply.

For restaurants: Autumn and winter scallops — served with cauliflower, black pudding, or simply browned in butter — are a natural seasonal dish that customers expect in Scotland. Feature them from October.

For fishmongers: Whole in-shell scallops through autumn and winter are one of the best counter products available. Customers who don't know how to prepare them will ask — which is a conversation that builds loyalty.

Salmon

Farmed salmon: Year-round availability Wild salmon season: February to October (varies by river) Best availability: Year-round for farmed; summer for wild

Scottish farmed salmon is the most consistently available product on the wholesale market — supply is year-round and quality is managed to a consistent standard. It's the backbone of wholesale salmon supply for restaurants, hotels, care homes and fishmongers across Scotland.

Wild Scottish salmon has a defined season — typically running from February to October, with the best runs varying by river. Wild salmon is increasingly rare as a wholesale product and commands significant premium pricing when it's available. For restaurants that want to feature genuinely wild salmon, supply relationships with specific rivers or catchers are necessary.

Sea trout — often overlooked — runs alongside salmon and offers a more delicate flavour at a typically lower price point. Available roughly March to September.

For restaurants: Feature sea trout in spring and early summer as a seasonal alternative to salmon. It's less widely known and customers who discover it become regular buyers.

For care homes: Farmed salmon is a consistent, year-round product that works across every care home menu format — portions, fillets, whole fish. No seasonal management required.

Mackerel

Peak season: Summer through early autumn (June to October) Avoid: Winter (November to March) Year-round availability: Limited in winter

Mackerel is one of Scotland's most seasonal products — and one of the most dramatically affected by season. Summer mackerel that have fed well through the warmer months are fat, richly flavoured, and at their absolute best. Winter mackerel are lean, have thin flesh, and are barely worth buying.

The difference between a summer mackerel and a winter mackerel is not subtle. It's the difference between a fish worth featuring on a menu and one that should be avoided. Buy mackerel aggressively through summer. Leave it alone through winter.

For fishmongers: Whole mackerel — line-caught Scottish mackerel in peak summer condition — are one of the most visually impressive fish on a counter. Customers respond to them. Price them fairly and sell them fast because they don't keep well.

For restaurants: Mackerel in various preparations — smoked, cured, grilled — is a natural Scottish summer menu item. Source it aggressively when the season is on and rest it completely when it isn't.

Herring

Peak season: Summer (June to September) Year-round availability: Limited

Scottish herring follows the same seasonal logic as mackerel — summer fish that have fed well are fat and flavourful. The traditional Scottish kipper is made from summer herring specifically because the fat content produces the best result when smoked.

Fresh herring outside summer is available but lacks the fat content and flavour depth of the peak summer fish. For fresh preparation, buy herring in summer. For smoked herring products (kippers, rollmops), the best quality comes from summer-smoked product.

For fishmongers: Fresh Scottish herring in summer is an opportunity — it's underpriced relative to its quality and customers are discovering it as a sustainable, affordable oily fish. Feature it with cooking suggestions.

Crab

Peak season: Late spring through autumn (May to October) Avoid: Winter (December to February) Year-round availability: Yes, but condition varies

Scottish brown crab is available through most of the year but the season for the best meat yield runs from late spring through to autumn. Winter crab are often "watery" — the shells are full but the meat content is lower and the flavour less intense.

Dressed crab — prepared brown and white meat — is consistently popular with restaurants and fishmongers year-round. The best quality dressed crab comes from autumn crabs that have built good condition through summer.

For restaurants: Dressed crab through summer and autumn is a natural Scottish starter. Combined with Hebridean langoustines and hand-dived scallops on a Scottish seafood platter, it's the kind of dish that defines a Highland restaurant's identity.

Lobster

Peak season: Summer (June to September) Year-round availability: Yes, price varies significantly

Scottish lobster is available year-round but summer supply is highest and prices are at their most competitive. Through winter, catches fall, prices rise, and the decision to feature lobster on a menu becomes more expensive.

For most restaurants and hotels, lobster is a special-occasion item regardless of season — the price point makes it a premium menu feature. Through summer, when supply is good and prices are lower, it's worth featuring more prominently.

Mussels

Peak season: Autumn through spring (September to April) Avoid: Summer spawning period (June to August) Year-round availability: Limited in summer

Scottish rope-grown mussels have a defined off-season in summer when the animals are spawning and in poor condition — thin-fleshed, watery, not worth buying. Through autumn, winter and spring, mussels are at their best — full of meat, well-flavoured, and one of the most affordable seafood products available.

The "month with an R" rule — don't eat shellfish outside months with an R — dates from the era before refrigeration and doesn't apply in the same way today. But the seasonal pattern it reflects is real: autumn through spring is mussel season.

For restaurants and pubs: Mussels are one of the highest-margin items on a seafood menu. A kilo of Scottish mussels, steamed with white wine and garlic and served with bread, is simple to prepare, quick to cook, and impressive to serve. Feature them from September through spring.

Lemon Sole and Plaice

Peak season: Spring through early summer (March to June) Year-round availability: Yes

Both lemon sole and plaice are at their best through spring and early summer — before the summer spawning period softens the flesh. Spring plaice in particular is excellent: sweet, clean-flavoured, and worth featuring as a seasonal item.

For fishmongers: Whole plaice in spring is an attractive counter product that customers recognise and respond to. It's also good value relative to more prestigious flatfish like turbot or halibut.

Monkfish

Peak season: Year-round Availability: Consistent

Monkfish is the most seasonal-proof species on this list. Its deep-water habitat and feeding behaviour mean condition is relatively consistent across the year, making it one of the most reliable products for restaurants and hotels who want a year-round premium white fish option.

A Seasonal Buying Calendar — Quick Reference

Month	Best Buys	Avoid
January	Cod, scallops, mussels	Mackerel, herring
February	Cod, scallops, mussels	Haddock (spawning), mackerel
March	Lemon sole, plaice, sea trout	Haddock (spawning), mussels
April	Lemon sole, plaice, sea trout	Haddock, cod (spawning)
May	Langoustines, lemon sole, crab	Mussels (spawning)
June	Langoustines, mackerel, herring, crab	Mussels, scallops
July	Langoustines, mackerel, herring, lobster	Mussels, scallops, haddock
August	Langoustines, mackerel, haddock, lobster	Mussels
September	Haddock, langoustines, scallops, crab, mussels	—
October	Haddock, scallops, cod, crab, mussels	Langoustines (reducing)
November	Cod, scallops, mussels	Mackerel, herring
December	Cod, scallops, mussels, lobster	Mackerel, herring

Using This Guide for Your Business

Chefs and restaurant buyers: Use this calendar to plan seasonal menu changes 4 to 6 weeks ahead. Seasonal buying creates better dishes, lower costs, and a more credible provenance story.

Fishmongers: A counter that reflects the season is more interesting and more credible than one with the same species at the same prices all year round. Seasonal rotation gives customers a reason to keep coming back.

Chip shop owners: The main seasonal consideration is haddock quality through the spring spawning period. Understanding when your fish is at its best helps you manage quality expectations and supplier conversations more effectively.

Care home catering managers: Year-round staples — farmed salmon, frozen haddock, smoked haddock — mean seasonality is less critical for care home menus. But incorporating seasonal species into special occasion menus adds variety residents genuinely appreciate.

Clark Seafoods — Daily Availability Updates

Clark Seafoods updates today's availability daily at clarkseafoods.co.uk/todays-availability — reflecting what's landed at Peterhead, Shetland and our own Buckie landings. Trade customers can check current species, condition, and pricing before placing orders — making seasonal buying practical rather than theoretical.

Open a trade account at clarkseafoods.co.uk.