A cold chain is a system which runs unbroken from the moment a fish is caught until it reaches the plate. Fisheries and aquaculture production reached 223.2 million tonnes in 2022, including 185.4 million tonnes of aquatic animals, with per capita consumption at 20.7 kg and USD 195 billion traded internationally (FAO 2024). About 23.8 million tonnes of edible aquatic food was lost or washed in 2021, some 14.8% of production (World Economic Forum, 2024).
Seafood spoils faster than most foods because it has high water-content, near-neutral pH, high unsaturated fat, and it also carries bacteria already adapted to cold water.
Why Seafood Requires Specialized Packaging
Seafood requires special packaging since it has to handle several points of failure at once.
For instance, bacterial multiplication, fat oxidation, rancidity, drip loss, odour build up, and a soft fillet that can be easily bruised in transit.
Conventional System and Temperature Control
| System | What it does well | Where it falls short |
| Ice and insulated boxes | Cheap, fast chilling at landing | Melts, adds weight, needs topping up |
| EPS/polystyrene boxes | Light, good insulation | Bulky to return, hard to recycle |
| Corrugated boxes | Stackable, recyclable | Weakens when wet |
| Plastic trays and films | Cheap, seals well for retail | Mostly fossil-based, low recycling |
| Vacuum packing | Removes oxygen; suits frozen and smoked | Anaerobic pathogen risk |
| Modified atmosphere (MAP) | Slows bacteria, keeps pack shape | Drip loss 2-6%; mix must match species |
Source: Mireles DeWitt and Oliveira (2016)
Insulation along with temperature is what buys time. Gel packs and phase-change materials hold a set temperature while they melt, which is why one box survives a delayed flight and an identical box packed carelessly does not.
Different seafood products require different packaging. For instance, fresh fish needs drip control and a high-CO2 atmosphere, frozen fish needs a moisture barrier that survives freezer burn, shrimp and prawns need protection from melanosis (the black spotting that makes them unsellable), live molluscs require breathable packaging, smoked and ready-to-cook products carries the risk of listeria, making vacuum or MAP plus strict chilling the norm.
Modified Atmosphere and Vacuum Packaging
Modified Air Packaging (MAP) replaces the air inside a pack with a specific gas mix to slow down spoilage and keep the materials inside the pack fresh for a longer period of time. Carbon dioxide preserves by slowing down microbial growth, inert nitrogen fills the space so that the pack does not collapse, and oxygen is usually removed to stop rotting, but sometimes kept high for fresh fruits or red meat.
Mixtures vary by species: 60:40 CO2:N2 for super-chilled Atlantic salmon, 50:45:5 CO2 for cod loins.
As little as 5% CO2 controls Pseudomonas spoilage bacteria, and super-chilled MAP salmon lasted four times longer than air-packed fish. The costs are real, drip loss of 2% to 6% is typical, and Clostridium botulinum type E grows and makes toxin from 3.0-3.3°C upward (Mireles DeWitt & Oliveria, 2016). Vacuum packing removes oxygen entirely, which suits frozen and smoked products, but the same anaerobic risk applies.
Active Packaging
Active packaging is a modern packaging system that interacts with the internal environment or the product to extend shelf life, freshness and safety.
Oxygen scavengers slow oxidation, CO2 emitters top up gas that dissolves into the flesh, moisture absorbers handle drip, antimicrobial films release preservatives.
Realistically, two results show the gain. MAP with a CO2 emitter reached 13 days of shelf life against 7 days for vacuum packing alone, and thymol at 1,000 ppm with MAP reached 14 days against 5 for the control (Kontominas et al., 2021).
Intelligent Packaging and the Digital Cold Chain
Intelligent packaging reports rather than protects. Time-temperature indicators change colour once a pack has been too warm for too long; one UV-Activated Photochemical Time-Temperature Indicator (TTI) was built to track fish fillets under MAP in chilled storage (Kontominas et al., 2021). Freshness indicators respond to spoilage gases, and pH indicators shift with the amines fish releases.
Around these sit temperature loggers, GPS, RFID tags, cloud dashboards raising alerts mid-journey, and blockchain records tracing a box to a vessel.
Emerging Sustainable Materials
Seafood packaging is a hard sustainability case because it is wet, cold, often bloodstained and rarely recyclable once used. Biodegradable films and compostable trays must stay strong at chill and freezer temperatures, resist moisture all journey, then break down. That combination slows adoption here, and all bio-based plastics remain under 1% of global plastic output (Javed et al., 2026).
Paper and moulded fibre are replacing plastic trays where wet strength allows. Among bio-based polymers, PLA is the most commercially mature but brittle, while PHAs offer excellent oxygen barrier performance, which matters directly for rancidity, though their thermal stability during processing is poor (Javed et al., 2026). This is where PHA-blends are preferred. Cellulose films, chitosan and seaweed materials fill specialist roles as well.
Edible Coatings and Nanotechnology
An edible coating is a thin layer applied to the fish itself. Chitosan, alginate, gelatin and whey proteins are the common bases, often carrying antioxidants or essential oils. One chitosan coating with clove oil held moisture loss to 72.9% at 120 days after freezing in pompano fillets, and coating work partly by blocking oxygen diffusing into the flesh (Kurek et al., 2024). Strong oils affect taste, so dosing matters.
Nanocomposite films, nano-cellulose and antimicrobial nanoparticles improve barriers and release actives slowly. Migration into food and regulatory approval remain open.
Quality, Safety and the Temperature Clock
Packaging decides microbial load, oxidation, drip loss, texture, colour and odour, but cannot fix a broken cold chain.
Histamine makes the point. In susceptible species such as tuna, mahi-mahi, marlin and bluefish, the FDA guidance level is 50 ppm, and fish exposed to air or water above 28.3°C must be chilled to 4.4°C or below within 6 hours, or 9 hours when cooler (U.S. Food and Drug Administration, 2022). Histamine survives cooking; no packaging removes it.
Frequently Asked Questions
Does better packaging replace refrigeration?
No. MAP, coatings and active systems extend shelf life on top of a working cold chain. Histamine forms during temperature abuse and survives cooking (U.S. Food and Drug Administration, 2022).
Is vacuum packing safer than MAP?
Neither removes anaerobic risk. Clostridium botulinum type E grows from about 3.0°C upward, so both rely on strict chilling.
References
FAO. (2024, June 7). FAO report: Global fisheries and aquaculture production reaches a new record high. https://www.fao.org/newsroom/detail/fao-report-global-fisheries-and-aquaculture-production-reaches-a-new-record-high/en
Javed, A., Mehmood, W., Bhatnagar, A., & Dessbesell, L. (2026). Bio-based plastics in food packaging: Performance, environmental impact, end-of-life, technology readiness level and market trends. Applied Food Research, 6, 102219. https://doi.org/10.1016/j.afres.2026.102219
Koller, M., Heeney, D., & Mukherjee, A. (2025). Biodegradability of polyhydroxyalkanoate (PHA) biopolyesters in nature: A review. Biodegradation, 36(4), 76. https://doi.org/10.1007/s10532-025-10164-y
Kontominas, M. G., Badeka, A. V., Kosma, I. S., & Nathanailides, C. I. (2021). Recent developments in seafood packaging technologies. Foods, 10(5), 940. https://doi.org/10.3390/foods10050940
Kurek, M., Pišonić, P., Ščetar, M., Janči, T., Čanak, I., Vidaček Filipec, S., Benbettaieb, N., Debeaufort, F., & Galić, K. (2024). Edible coatings for fish preservation: Literature data on storage temperature, product requirements, antioxidant activity, and coating performance—A review. Antioxidants, 13(11), 1417. https://doi.org/10.3390/antiox13111417
Mireles DeWitt, C. A., & Oliveira, A. C. M. (2016). Modified atmosphere systems and shelf life extension of fish and fishery products. Foods, 5(3), 48. https://doi.org/10.3390/foods5030048
U.S. Food and Drug Administration. (2022). Fish and fishery products hazards and controls guidance, Chapter 7: Scombrotoxin (histamine) formation. https://www.fda.gov/files/food/published/Fish-and-Fishery-Products-Hazards-and-Controls-Guidance-Chapter-7-Download.pdf
World Economic Forum. (2024, April 15). Investigating global aquatic food loss and waste. https://www.weforum.org/publications/investigating-global-aquatic-food-loss-and-waste/
