Fish & Seafood

Helping food processors ensure that the final seafood product- whether frozen, chilled or packed in a modified atmosphere – retains its original freshness, taste and appearance

Salmon fillets being prepared for cooking

BOC is a trusted partner to the fish industry – with a proven track record in helping fish farmers to create the best possible environment for both freshwater and seawater fish, and in helping processors to ensure that delicate seafood products reach the consumer’s table without any loss of quality or taste. We work closely with our customers at our technology centres and at our international aquaculture R&D centre in Norway. This gives us an in-depth, hands-on understanding of the specific challenges involved in farming and processing fish. 

Big fish in a big pond 

Rapid yet gentle chilling and freezing is essential to prevent fish from losing its original quality due to high water activity, its neutral pH value (which is ideal for microorganisms) and the presence of enzymes, which rapidly undermine both taste and smell. At BOC, we have a wide range of dedicated cryogenic chilling and freezing solutions that maintain safety and quality standards across the entire seafood chain. Highlights include our ACCU-CHILL® BI in-line chilling system for fish patties, our CRYOLINE® CWI freezer for individually quick-frozen (IQF) foods such as shrimps and our CRYOLINE® MT freezer for fish fillets. Cryogenic freezers can also enhance processing, enabling you, for example, to add protective glazes to fish.  

Packaging atmospheres play an equally important role when it comes to fish. Our specially developed modified atmosphere packages (MAP) – with bespoke mixtures tailored to the requirements of different fish types – can extend shelf-life by several days.  

And to ensure an uninterrupted cold chain right up to the consumer, you can rely on our in-transit refrigeration systems to protect your seafood after it leaves your plant.


Carbon Dioxide (CO2) 

Carbon dioxide is used in Modified Atmosphere Packing (MAP) to inhibit the growth of fungi and bacteria

Liquid carbon dioxide is used in cryogenic freezing & chilling applications

Carbon dioxide is used in the carbonation of fizzy drinks and for food inerting applications

Oxygen (O2)

Oxygen is used in Modified Atmosphere Packing (MAP) to maintain the quality, flavour, texture and appearance of food

Nitrogen (N2) 

Nitrogen is used in Modified Atmosphere Packing (MAP) to prevent oxidation and reduce odours 

Liquid nitrogen (LIN) is used in cryogenic freezing & chilling applications 

Nitrogen can also be used for food inerting applications and for increasing the strength of plastic drinks bottles

Gas Mixtures 

Oxygen, nitrogen and carbon dioxide can be combined in various quantities to produce the ideal preservation gas for any food type. 



BOC Food Fresh cylinders and Manifolded Cylinder Pallets (MCP) have been developed for food businesses using modified atmosphere packaging (MAP).

Food Fresh cylinders can be supplied as single gases or as mixtures. Your BOC sales and technical specialist will advise on the appropriate mixing equipment, or pre-mix cylinders. Where a pre-mix gas is chosen, BOC will advise on the exact gas mixture for packing your product.


BOC’s Cryospeed service gives you access to larger volumes of oxygen, nitrogen and carbon dioxide in cryogenic liquid form. These are stored in fully maintained stainless steel vacuum-insulated vessels on your site and are filled by our Cryospeed operators. Our storage vessels are set up for the pressures, flow rates and sizes appropriate to each customer. All rented vessels are fully maintained under the supply agreement with BOC. 


High gas volumes can be stored in BOC bulk cryogenic vessels. These are installed at the customer’s site, providing a continuous and secure supply of oxygen, nitrogen or carbon-dioxide. Our Customer Engineering Service (CES) designs, installs and maintains the vessel in line with customer requirements and in compliance with all the relevant regulations (such as the Pressure Systems Safety Regulations 2000). Our On-Stream service can also cover customer-owned systems.  

On-site generation 

For those needing generated nitrogen, the BOC Ecovar-mini range provides an on-site generation solution at a range of pressures, flow rate and purity. On-site generation requirements are assessed on a site-specific basis to ensure the resulting set-up will cater for your needs now and in the future. 

Boost the performance of your food manufacturing business with cryogenic freezing