How ocean intelligence shapes fishing management decisions

Commercial fishing is one of the most unpredictable industries on earth. Every time a fishing vessel leaves port, it enters an environment that’s constantly changing. Natural processes are evolving, weather patterns shift, currents move, and fish stocks migrate and human activity such as energy generation, aggregate extraction, marine conservation and fibre-optic cable laying is making our sea space more congested and contested than ever before.

Getting decisions right, before and during each voyage, depends on more than experience. It depends on data.

Modern pelagic fishing is as much a data discipline as it is a maritime one. Weather routing, oceanographic intelligence, and stock science now shape how responsible operators plan routes, find fish, stay within sustainable limits and avid impeding other users of the sea. Used well, these tools connect three things that matter equally: crew safety, operational efficiency, and long-term stock health.

The ocean is always changing, and so must we

The sea is notoriously fickle. Conditions that look manageable at departure can deteriorate fast. Fish that were abundant in one area last season may have shifted entirely. Quotas change year on year based on the latest scientific advice.

For generations, experience and seamanship were the primary tools of navigation and fish-finding. That knowledge remains invaluable. Skippers who know the sea intimately are invaluable, but the scale and complexity of modern pelagic fishing have outgrown experience alone.

Vessels operating across international waters and managing multi-species quotas must also contend with evolving spatial restrictions from marine protected areas and offshore wind developments, all under growing regulatory and scientific scrutiny. As a result, they require a data-led approach to complement traditional expertise.

The good news is that the tools to support that approach have never been more powerful. Ocean intelligence – including weather routing, oceanographic data, and stock information – now shapes how vessels (including our own fleet) plan and execute every trip.

Safer routes, lower costs

Good weather routing starts well before a vessel leaves port. Real-time data on sea state, wave height, wind speed, and developing storm systems allows operators to plan routes that avoid the worst conditions, not just at departure, but throughout a trip that can last several weeks.

The first priority is always crew safety. Long pelagic voyages can operate in challenging sea conditions, and conditions can change dramatically within hours. Data-driven routing enables dangerous weather windows to be identified and avoided before they become a crisis.

The second benefit is efficiency. A vessel fighting heavy seas burns significantly more fuel than one running a well-planned route. Studies suggest that optimised weather routing can reduce fuel consumption by as much as 10–15% per voyage. For an industry where fuel represents one of the highest operating costs, that is a meaningful saving and a direct reduction in emissions per tonne of fish landed.

At NAFCO, smarter routing is part of a broader operational commitment to efficiency – fewer, longer, better-planned trips that maximise fuel economy and reduce our environmental footprint across the fleet.

Finding fish responsibly

Pelagic species respond to water temperature, salinity, currents, and the availability of food. Understanding those conditions helps operators locate fish more efficiently, reducing the time and fuel spent searching unproductive areas.

The modern fleet increasingly draws on satellite-derived sea surface temperature data, current mapping, and chlorophyll concentration indicators, a proxy for productive feeding grounds, to identify where fish are likely to be aggregating.

Oceanographic intelligence also supports more selective fishing. When crews understand the environmental conditions associated with particular stock compositions, where juvenile fish tend to concentrate, or where non-target species are more likely to be present, they can make better decisions about where and when to deploy nets. That kind of informed decision-making is one of the reasons bycatch rates in well-managed pelagic operations can be consistently kept below 1%. 

Efficiency and selectivity go hand in hand. But finding fish efficiently only matters when it’s done within clear scientific limits.

Fishing within the science

Stock assessment data produced by bodies like ICES and Cefas doesn’t just inform government policy. For responsible operators, it directly shapes where, when, and how much they fish. When science recommends a TAC reduction, as it has done in recent years for mackerel, herring, and blue whiting, the appropriate response is to follow it.

Short-term commercial pressure cannot override the evidence. Discipline in difficult years is what allows stocks and the businesses that depend on them to recover.

The quality of that science depends on the quality of data flowing into it, and that’s where industry has a direct role to play. Vessels at sea are uniquely positioned to contribute real-time catch composition data, biological samples, and behavioural observations that shore-based surveys cannot replicate.

At NAFCO, onboard quality managers collect catch data on every trip, which is shared with Cefas, the PFA, and ICES. Researchers are hosted aboard our vessels, providing independently verified catch data that strengthens both compliance and scientific understanding.

When industry and science share the same evidence base, management decisions become more robust, more trusted, and more effective for everyone.

Intelligence as a competitive and ethical advantage

Weather routing, oceanographic data, and stock information form a connected approach to safer, more efficient, and more responsible fishing. As regulatory scrutiny grows, marine space becomes more contested, and markets demand greater transparency, the case for data-led fisheries management only strengthens.

The most competitive and responsible operators will be those who treat ocean intelligence as a core part of how they fish. At NAFCO, our commitment is to use it well by planning safer voyages, finding fish with greater precision, and operating strictly within the limits that science sets, helping ensure the sea continues to feed people reliably and responsibly for generations to come.