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A commitment to Cod - A story of Sustainability

Updated: Jan 17

The recent documentary, Seaspiracy, has a lot of people talking about the sustainability of seafood. Anyone who knows me is well aware of my love of fish oil and its benefits. It is so important to me that it be truly ethically sourced and produced, and it is only by ensuring true traceability from boat to bottle that can we achieve that.

Our friends at Rosita have written a blog about the importance of sustainability in fish oil supplements. We wanted to share it with you because it is incredibly important.

Rosita Cod Liver Oil


"At Rosita, our ethos is to work with nature to create the highest quality, most sustainable fish liver oils available. From the line fishing of codfish in the pristine Norwegian fjords where we live to the harvesting of the livers to the extraction of the oil, every step of our method is sustainable and ethical. This type of cod liver oil is nearly impossible to achieve with the standard mass-production methods used by major brands, where heavy refining strips the oils of most of their nutrients. Here’s how we obtain our extra-virgin cod liver oil and why we do it the way we do.

In Harmony with our Environment.

Our extra-virgin cod liver oil (EVCLO) begins its journey in Norway, sourced from the pristine, crystal clear waters. The cod that we fish are wild, situated far from the farmed fishing areas, in their own sustainable cod stocks where they’re able to thrive. We’re committed to protecting these waters as best we can to support the delicate balance of the ecosystem and cause as little interference as possible.

1. Our wood-and-aluminum fishing boats are small and belong to us, meaning we can control the way we fish and ensure that correct processes are followed. Compared to larger commercial fishing vessels, our artisan boats cause minimal disruption to the environment and help protect the species. We put out long lines baited with slices of frozen mackerel or herrings, which enables us to carefully catch the cod without destructive trawling methods that cause the fish stress and physical damage.

2. We practice long-line fishing, using lines that are seabird-friendly rather than large nets that can harm or entrap animals and other bycatch. We also fish for deep-sea codfish in waters over 200 meters deep. Conversely, other commercial manufacturers often purchase fish on the open market or from brokers, which can result in a greater carbon footprint and no guarantee of freshness or sustainability.

3. We avoid overfishing by focusing on small-batch production and abiding by the strict fishing quotas set by the Norwegian government.

4. We believe in balance, so any unused catch, or offal, is thrown back to the seabirds. We give back what we take in a cyclical, organic way that is in harmony with nature’s delicate balance.

Rosita Cod Liver Oil Founders

Bengt Svensson and Kari Hanne Nyland, the founders of Rosita

Clean Processes lead to clean oils.

No harmful chemicals are used during any stage of the creation of our EVCLO, and our oil-cleaning process uses natural substances from the ocean and excludes harmful chemicals and heat. This natural method means that the delicate fatty acids and naturally occurring vitamins remain robust and intact. Once we catch our codfish, our fishermen carefully remove the hooks and begin to harvest the livers on deck. They carefully sacrifice the fish, remove the livers, and wash them in clean, cold water. The livers are then immediately placed under proprietary conditions to maintain freshness, and the meat and insides are separated for other uses whilst the livers are quickly ferried to shore.

When the livers reach the docks, they’re carefully hand-inspected at Rosita’s zero-emission production premises, thereby avoiding any rough handling that could cause bruising or degeneration. Using an ancient Viking tradition, we use only the freshest livers that meet specific quality and weight. This means that the final livers are large, beautifully plump, soft to the touch, and have an almost cream-colored appearance, all of which indicate the health of the codfish they came from.

The final step is to release the oil from the fresh cod livers, using an ancient, natural method for cod liver oil extraction. They create a gentle shift in temperature from the icy cold water that the livers are submerged into below-room temperature. This triggers the livers to release their natural oils and is done without any heat whatsoever, which protects the oil’s nutritional value. Immediately after the oil is released, it is very lightly filtered using only a very low temperature and gravity, which helps remove particles of liver tissue without refining the oil. Conventional procedures tend to use more aggressive measures, such as molecular distillation, which unfortunately removes most of the healthy, fat-soluble vitamins. Synthetic vitamins are routinely added by commercial producers to make up for this loss. In fact, most popular cod liver oil brands are purified to the point where the natural vitamin A and vitamin D3 are damaged or completely destroyed.

Finally, they add a drop of rosemary and natural, GMO-free vitamin E to maintain freshness and bottle the oil in amber glass to extend its shelf life. The bottle is then nitrogen-flushed, and oxygen is removed to ensure safe shipping in all temperatures. They then test samples of each batch in a microbiological laboratory, which ensures each batch is certified to meet the strict European regulations for potency and purity. The result is 100% unadulterated, wild, and raw Extra Virgin Cod Liver Oil (EVCLO).

Rosita Cod Liver Oil manufacturing process

The dirty side of commercial cod liver oil production.

What usually happens with commercial cod liver oil production is that the oil comes from wild-caught and farmed pollock, haddock, or other fish species. In fact, the international production of cod liver oil is only regulated by one rule — the final product must match the specific EPA/DHA ratio found in raw cod liver oil. However, cheaper oils are often added to achieve the correct balance of EPA/DHA, and the oil is then bottled and sold wrongly as true Norwegian or Arctic cod liver oil. Commercial production companies usually use large trawlers that spend weeks at sea and fish in a manner that is damaging to the local environment. Often, the livers are collected and stored on the ship for days when they start to degrade. They are then ground up, heated, or cold-pressed mechanically to extract the oil, which destroys most of its nutritional value. The leftover cod liver meal is then shipped to Southeast Asia, where it’s used in the shrimp feed industry. In essence, the marketing term “cold-pressed” cod liver oil does not, in fact, mean that the liver is somehow raw or gently processed. In reality, it means that the oil is extracted cold from the liver before being heated up to high temperatures during post-extraction mechanical processing.

Natural Fishing Method.

The wooden fishing boats are made water-resistant by using non-oceanic resources to ensure that the wood doesn’t deteriorate and the boats don’t degrade and sink, which would not be very sustainable! The keel and frames are traditionally made of hardwoods, like oak, while the planking is often made of softwood, like pine, larch, or cedar. Glue, screws, rivets, and nails are used to join these wooden components. Boiled linseed oil is often used to line the inside of the boats as it is mildew resistant. We also have some boats that are made of various materials, such as acrylic, aluminum, and stainless steel, with some made partly from fiberglass.

They have alliances with artisan fishers who are extremely experienced and equipped with fishing knowledge passed down through the generations. This means that their fishing practices and processing procedures are rather traditional. Many of their techniques originate from ancient Viking times, tried and tested through and through. And you know what they say, practice makes perfect.

The fishers use traditional, small boats with shelter decks for some protection from the weather. Seabird-friendly long lines are used, as opposed to destructive trawling methods. This is a more selective way to catch the cod and helps to ensure that by-catch is limited. It also limits the number of juvenile cod caught, as if a juvenile is caught, they can be released back into the ocean more easily than with other methods. The barbless hooks that they use shorten the time that the juvenile fish is caught and reduce the impact on the fish. Because of this, its chance of survival is increased when it is released, helping to avoid depletion of the cod population.

How Stable is the availability of Rosita Cod Liver oil?

Winters in Norway are long and harsh. They operate in some of the most rugged waters in the world, with steep mountains lining the deep fjords, rocky coasts, and vicious waves at times. As these waves can be very dangerous for their fishermen, they have to take a lot of care, and when conditions get too bad, the fishing and harvesting of codfish have to be postponed. As a result, there will be ebbs and flows in our cod liver oil production.

As mentioned, their EVCLO is sourced using ancient fishing practices, which also determine what time of day fishing can occur. Along with this, there are quotas set by the Norwegian government to ensure Atlantic cod isn’t overfished, so Rosita cod liver oil supply is limited to protect the native fish stocks.

In summary, there may be shortages of EVCLO due to numerous factors. However, these factors also make their oil that much more unique and sustainable. They take no shortcuts. Instead, they have expanded our production capabilities to become more efficient and have invested in a modern bottling facility.


Their wild codfish is caught with a high level of traceability, meaning they can trace it back to the boats exactly where each batch came from. This gives them the certainty that no unsustainable or unethical corners were cut to get the final product."

Check out Rosita Real Foods, our favorite fish oils!


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