What is the difference between frozen sole and fresh sole?

Frozen sole is harvested and frozen at sea or shortly after landing, locking in freshness, while fresh sole is kept chilled and must be consumed quickly. Frozen sole offers longer shelf life and consistent quality, while fresh sole is prized for its texture and is not suitable for long storage.

How can I tell if frozen sole has been thawed and refrozen?

Signs include large ice crystals, a water-logged texture after thawing, and dry or discoloured patches. Look for intact packaging with no frost, and check that the fish is solidly frozen, as refrozen products often have a softer feel and poor texture.

What is the best way to thaw frozen sole?

Thaw in the refrigerator overnight, which gives an even and safe thaw, preserving texture and flavour. Avoid thawing at room temperature or in hot water, as this can cause bacterial growth and deteriorate the fish.

Can I use frozen sole directly in cooking without thawing?

Yes, but cooking time will be longer and the outside might overcook before the inside is done. For best results, particularly when pan-frying or baking, thawing first ensures even cooking and prevents a rubbery texture.

What does 'glazed' mean on frozen sole?

Glazing is a thin layer of ice applied to the fish to prevent freezer burn and dehydration. While a small amount is normal, excessive glaze may indicate added water weight, so check for clarity in packaging or in the specification to know the actual fish content.

Frozen Sole

Frozen sole is fish of the genus Solea that is preserved by freezing.

Prices, specifications and international trade for frozen sole under HS 030333.

Frozen Sole Price

$2,235USD/t

Published reference · Jul 1, 2026

Frozen sole is quoted in USD/t at NLD. Historical customs values may differ from the headline reference.

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Frozen Sole Historical Unit Values

Frozen Sole Suppliers

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Frozen Sole Exports and Imports

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Netherlands led reported frozen sole exports in 2025, at $34M.

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Frozen Sole Specifications and Quality

Frozen sole grading factors include Appearance and colour, Glaze and ice content, and Size and uniformity.

Grading Factors

Quality assessment for frozen sole considers Appearance and colour, Glaze and ice content, and Size and uniformity.

Appearance and colour
The fish should have bright, clear eyes, red gills, and a shiny skin with no discoloration, indicating freshness and proper handling before freezing.
Glaze and ice content
An even, protective glaze prevents freezer burn and dehydration, but excessive glaze weight can be a sign of added water, which affects yield and value.
Size and uniformity
Consistent size and thickness of fillets or whole fish ensure even cooking and portion control for buyers, impacting usability in restaurants and further processing.
Texture and integrity
Flesh should be firm and not mushy, and fillets should be intact without ragged edges or separation, which indicates careful handling and quick freezing.

Common Defects

Recorded defects for frozen sole include Freezer burn, Off-odours, and Ice crystal damage.

Freezer burn
Dry, white or brown patches on the surface caused by dehydration, resulting in tough, dry areas that diminish taste and texture.
Off-odours
Unpleasant fishy, rancid or musty smells due to bacterial action, oxidation of fats, or absorption of foreign odours during storage, signalling spoilage or poor handling.
Ice crystal damage
Large ice crystals from temperature fluctuation can puncture cell walls, causing the flesh to become watery and mushy upon thawing.

Frozen Sole Facts and HS Code

Frozen sole belongs to seafood within protein and dairy. Its customs classification covers HS 030333.

Frozen Sole HS Code

Also known as	sole fillets, Dover sole, common sole
Scientific name	Solea spp.
Product type	Raw
Form	Frozen
Position in the chain	Primary
Category	Seafood — Protein and dairy
HS codes	030333
HS6 description	Fish; frozen, sole (Solea spp.), excluding fillets, fish meat of 0304, and edible fish offal of subheadings 0303.91 to 0303.99
Quoted in	USD/t
Reference location	NLD

Production & Handling

Frozen sole storage guidance: Maintain a stable deep-frozen environment with minimal temperature fluctuation to prevent ice crystal growth and quality degradation. Avoid temperature abuse during thawing or refreezing.

Production and Storage

Perishability	High
Temperature regime	Frozen
Storage conditions	Maintain a stable deep-frozen environment with minimal temperature fluctuation to prevent ice crystal growth and quality degradation. Avoid temperature abuse during thawing or refreezing.
Production methods	Wild capture
Processing steps	Catch sole using bottom trawls or gillnets Sort and grade by size on vessel Chill on ice or in refrigerated seawater immediately Freeze whole or after filleting (skinless, boneless) when at port or at-sea Glaze with water or protect with plastic film Pack in cartons or bags Store at deep-frozen temperature until shipment

Packaging

Typical frozen sole packaging includes Individually wrapped fillets, Bulk cartons, and Vacuum-packed film.

Individually wrapped fillets
Each fillet is wrapped in plastic or vacuum-scaled, protecting against freezer burn and making it easy to separate portions, suitable for retail and foodservice.
Bulk cartons
Fillets or whole fish are packed in waxed or plastic-lined cartons with interleaving paper, used for large volumes and further processing, offering cost efficiency.
Vacuum-packed film
Vacuum packaging removes air, reducing oxidation and freezer burn, ideal for high-quality products and extended storage where appearance matters.

Uses & Risks

Frozen sole is used in Pan-frying or baking, Fish processing, and Foodservice menu items.

End Uses

Pan-frying or baking
Sole fillets are often cooked gently by frying or baking, serving as a delicate, flaky seafood main course.
Fish processing
Frozen sole can be further processed into breaded portions, fish sticks, or ready-to-cook dishes for the retail and foodservice sectors.
Foodservice menu items
Restaurants and caterers use sole fillets to prepare classic dishes such as sole meunière or fish and chips, valued for their mild flavour and fine texture.
Retail seafood case
Frozen sole is sold directly to consumers, convenience and availability being key reasons for choosing this form.

Uses and Related Commodities

Downstream industries	Seafood processing, Foodservice, Retail, Ready-meal manufacturing

Sourcing risks

Risk	Category	Severity	Mitigation
Cold chain failure LogisticsHigh Temperature fluctuations during transport or storage cause thawing and refreezing, leading to moisture loss, texture breakdown and potential spoilage.	Logistics	High	Use temperature-monitored containers and maintain a continuous deep-freeze chain until the point of sale or processing.
Histamine formation Food safetyMedium If the fish is not chilled promptly after capture, bacteria can produce histamine, which is not destroyed by freezing and can cause allergic-like food poisoning.	Food safety	Medium	Ensure immediate chilling on board and cold handling throughout the supply chain to limit bacterial growth.
Import quota and tariff changes PolicyMedium Changes in trade policies affecting sole imports can alter market access and costs, impacting supply stability for buyers.	Policy	Medium	Diversify sourcing from different origins and monitor policy changes in trade agreements to anticipate impacts.

Frozen Sole Questions

What is the difference between frozen sole and fresh sole?: Frozen sole is harvested and frozen at sea or shortly after landing, locking in freshness, while fresh sole is kept chilled and must be consumed quickly. Frozen sole offers longer shelf life and consistent quality, while fresh sole is prized for its texture and is not suitable for long storage.
How can I tell if frozen sole has been thawed and refrozen?: Signs include large ice crystals, a water-logged texture after thawing, and dry or discoloured patches. Look for intact packaging with no frost, and check that the fish is solidly frozen, as refrozen products often have a softer feel and poor texture.
What is the best way to thaw frozen sole?: Thaw in the refrigerator overnight, which gives an even and safe thaw, preserving texture and flavour. Avoid thawing at room temperature or in hot water, as this can cause bacterial growth and deteriorate the fish.
Can I use frozen sole directly in cooking without thawing?: Yes, but cooking time will be longer and the outside might overcook before the inside is done. For best results, particularly when pan-frying or baking, thawing first ensures even cooking and prevents a rubbery texture.
What does 'glazed' mean on frozen sole?: Glazing is a thin layer of ice applied to the fish to prevent freezer burn and dehydration. While a small amount is normal, excessive glaze may indicate added water weight, so check for clarity in packaging or in the specification to know the actual fish content.