Fishing the Oslofjord: What You Can Catch, Where, and the Rules You Need to Know

Since January 2024, all cod fishing in the Oslofjord is banned. Not catch-and-release. Not size-limited. Banned outright. If you hook a torsk by accident, you are legally required to unhook it and put it back immediately. This applies year-round, to everyone, everywhere in the fjord. It is one of the most aggressive marine conservation measures currently in force in European waters, and most people planning a fishing trip to Oslo have no idea it exists.

The cod collapse in the Oslofjord was decades in the making. Overfishing, warming water temperatures, habitat degradation from agricultural runoff, and the restricted circulation caused by the Drøbak Sill all contributed. Scientists at the Institute of Marine Research watched the stock shrink year after year. When the government finally acted, they did not go halfway. Nets were banned. Set lines were banned. Traps were banned (with one exception I’ll get to). Three entire zones of the fjord were closed to all fishing. What remains legal is narrower than most anglers expect, and knowing the rules before you arrive will save you a fine or an awkward conversation with Fiskeridirektoratet.

The rules as of January 2026

The regulations changed again in October 2025, tightening further. Here is the current state.

Hand-held gear only. You may fish recreationally in the Oslofjord using a rod, a hand line, or a jig that you are physically holding while fishing. That is it. Gill nets, fyke nets, trammel nets, set lines, longlines, and unattended traps are all prohibited for recreational fishers. If you cannot hold it in your hands, you cannot use it.

Cod: total ban. All cod (torsk) must be released immediately if caught. No exceptions for size, season, or method.

Three no-fishing zones. From January 2026, three large areas of the Oslofjord are completely closed to all fishing. One covers a section of the inner fjord. The other two surround Færder and Ytre Hvaler National Parks in the outer fjord. Within these zones, you cannot fish at all, for any species, with any gear.

The crab exception. Children may still fish for crabs using a hand-held line, even inside the no-fishing zones. This is the one concession. A kid with a piece of string and a mussel shell dangling off a dock is still allowed. I appreciate that the government thought to protect this. Crabbing from a pier is basically a Norwegian childhood rite of passage.

Tourists: no licence needed. Foreign visitors can fish Norwegian saltwater without purchasing a licence, as long as they use hand-held gear. This is part of allemannsretten, the right of public access that applies broadly to Norway’s outdoors. Freshwater is different (salmon and trout rivers require a licence), but for saltwater rod fishing in the fjord, you just need to follow the gear and species rules above.

What you can actually catch

Despite the restrictions, the Oslofjord still holds fish. The species table below covers what recreational anglers target in the fjord today, along with seasons and the Norwegian names you will hear at any local tackle shop.

Mackerel: the fish that saved Oslofjord fishing

Makrell is the one species that reliably delivers. From mid-June through September, schools of Atlantic mackerel pour into the fjord following the warm surface currents. On a good day, you can see them from the boat: dark flickers just below the surface, moving fast. A simple sabiki rig or a single jig bounced through a school will produce fish within minutes. They are not difficult to catch, which is precisely why they are the most popular recreational target in the fjord. Half the docks in Oslo have someone jigging for makrell on a summer evening.

Mackerel also happen to be delicious. Norwegians grill them whole over charcoal or smoke them on the same day they are caught. The flesh is oily and rich, with a flavour that deteriorates faster than almost any other fish once it leaves the water. A mackerel eaten within hours of being caught is a completely different food from the one you buy vacuum-packed at a supermarket. This is not an exaggeration. If you have only ever eaten store-bought mackerel, you have not really eaten mackerel.

Sea trout: the one that requires homework

Sjøørret is the prestige catch. Sea trout are the anadromous form of brown trout: they hatch in freshwater rivers, migrate to the sea to feed, and return to the rivers to spawn. In the Oslofjord, you find them along rocky shorelines, particularly around river mouths and estuaries. They feed on small fish, shrimp, and crustaceans in the littoral zone, often in water less than a metre deep.

Catching them takes effort. Sea trout are wary, easily spooked, and most active during low-light periods at dawn and dusk. Fly fishing and light spinning are the standard approaches. The best anglers I know on the fjord fish for sjøørret exclusively and talk about little else. Spring and autumn are peak seasons, when the fish are actively feeding before and after their river spawning runs. Summer fishing is possible but slower, as the trout tend to move deeper during warm spells.

Some of the inner islands have accessible shorelines where wading anglers target sea trout at first light. Hovedøya and Gressholmen both have rocky points that hold fish in the right conditions.

Where to fish

The Oslofjord is 100 kilometres long. Not all of it fishes the same. The inner fjord, from Oslo south to Drøbak, is shallower, warmer in summer, and more sheltered. The outer fjord, from Drøbak to Færder, is deeper, colder, and more exposed. Each section holds different species at different times.

Inner fjord (Oslo to Drøbak). Mackerel fishing in summer is productive from docks, rocky points, and boats anywhere in the inner fjord. Sea trout fishing is best along the island shorelines and near the small river outlets on both sides of the fjord. Pollack sit along underwater structure: rocky drop-offs, old harbour walls, the edges of kelp forests. We see anglers on the islands throughout summer, casting from the rocks into deep water.

Drøbak narrows. The area around Drøbak and Oscarsborg, where the fjord squeezes to 1.3 kilometres wide, has traditionally been productive water. Strong currents push through the narrows and concentrate baitfish. Check the current no-fishing zone boundaries carefully before fishing here, as parts of the inner fjord closure may overlap. The Drøbak area is worth a visit beyond fishing anyway.

Outer fjord. Deeper water, bigger fish, more exposed conditions. The areas outside the national park closures still offer good fishing for pollack, mackerel, and the occasional coalfish. But the outer fjord demands more from your boat and your weather judgment. A full-day tour passes through some of these deeper waters on the way south, and even without a rod in the water, you can see how the character of the fjord changes beyond the sill.

Guided fishing trips

Two operators currently run guided fishing experiences on the fjord. Both know the regulations and adjust their spots and target species accordingly.

Oslo Fjord Boat Fishing runs three-hour guided trips from the northern Oslofjord using two Quicksilver boats. They supply all gear and focus on whatever is in season, primarily mackerel and pollack in summer. Budget-friendly option for visitors who want to try fjord fishing without investing in equipment.

Oslo Fjordfiske offers guided fishing combined with a “catch and cook” experience. They provide gear, instruction, and help with preparing what you catch. It is a good option if you want the full arc from water to plate.

Rekefiske: the Norwegian tradition that isn’t really fishing

Strictly speaking, prawning (rekefiske) is not rod fishing. But it is deeply embedded in Norwegian fjord culture and it deserves a mention here because visitors who hear about it always want to know more.

The tradition goes like this. You take a small boat out to deep water in the fjord, usually 60 to 100 metres. You lower a prawn pot or a small trawl (historically). You wait. You pull it up, hopefully full of reker. Then you eat them immediately on the boat, peeled and piled on white bread with mayonnaise and a squeeze of lemon. That is it. That is the entire activity. Norwegians consider this a perfectly valid way to spend a Saturday afternoon, and I agree with them.

The new regulations complicate recreational prawning somewhat, since traps and pots fall under the net/trap ban for most anglers. Check the latest rules from Fiskeridirektoratet before you plan a prawning trip, as the specifics around prawn pots have been updated several times.

Why the cod collapsed

The cod ban is not arbitrary. The Oslofjord cod population is in genuine crisis and has been for years. Multiple factors converged. Commercial and recreational overfishing removed breeding-age fish faster than they could reproduce. Rising water temperatures in the fjord pushed conditions outside the preferred range for Atlantic cod, which need cold, well-oxygenated water to thrive. Agricultural runoff fuelled algal blooms that degraded seagrass habitat, the nursery environment where juvenile cod shelter and feed during their first year.

And then there is the Drøbak Sill. The shallow ridge at Drøbak, only 19.5 metres deep, restricts water exchange between the inner and outer fjord. Deep water in the inner basin can go months without being replenished with oxygen-rich water from outside. When it stagnates, bottom oxygen drops. The cod that depend on deep-water habitat lose ground. The harbour porpoises that feed on the same prey species are affected too, though they are more mobile and can follow fish to better-oxygenated areas.

Recovery signs are unclear. Scientists at the Institute of Marine Research are monitoring, but nobody is willing to predict when or whether the ban will be lifted. The honest answer is that the Oslofjord cod stock may take a generation to rebuild, if the conditions allow it at all.

Shore fishing

You do not need a boat. Large stretches of the Oslofjord coastline are accessible on foot, and shore fishing with a rod is permitted outside the closed zones. Rocky points, harbour walls, and pier ends all produce fish in season. Mackerel come within casting range of the shore during summer, especially in the evenings when schools chase baitfish into shallow water. Pollack sit along underwater rock structure year-round. Sea trout anglers wade the shallows at dawn, casting small flies or spinners along the kelp line.

Good shore spots in the Oslo area include the rocky coastline along Bygdøy, the piers at Aker Brygge (yes, people fish here in the middle of the city), the islands accessible by public ferry, and the Drøbak waterfront further south. On the islands, Hovedøya’s western rocks and Gressholmen’s southern point both have deep water within a short cast.

Practical information

Gear rental. Both guided operators listed above provide gear. If you want to fish independently, XXL Sport (Aker Brygge) and local tackle shops sell basic jigging setups for mackerel starting around 300–400 NOK. A sabiki rig and a cheap telescoping rod is all you need for summer mackerel.

Regulations source. The Norwegian Directorate of Fisheries (Fiskeridirektoratet) publishes the official rules in Norwegian, with summaries in English. Regulations have changed frequently since 2024 and may change again. Check before you go. This is not a formality. The fines are real.

What to do if you catch a cod. Unhook it as quickly and carefully as possible. Return it to the water immediately. Do not photograph it, do not weigh it, do not admire it. Get it back in. Cod survival rates after catch-and-release are not great (estimates range from 50 to 85 percent depending on depth, temperature, and handling time), so speed matters.

Best months overall. July and August for mackerel. April through June and September through October for sea trout. Year-round for pollack if you know where to look. Autumn for crabs and prawns.

Can you fish from our boats?

We are not a fishing charter. Our private cruises focus on sightseeing, swimming, and the general experience of being on the fjord. Our tours pass through waters where mackerel, sea trout, and pollack are present, and on a full-day tour we cover enough of the fjord to see the range of marine life that still calls it home. If you want to combine a boat day with fishing, the guided operators above are the better fit. If you want to see the fjord itself and understand the ecosystem these fish live in, that is more our territory.

The fjord is changing

The Oslofjord my grandfather fished bore no resemblance to the fjord I know now. His had cod. Plenty of it. Nets were legal, traps were legal, you could keep whatever you caught. The regulations of 2024 and 2025 would have seemed absurd to his generation. But his generation also watched the water deteriorate to the point where swimming was discouraged and the bottom of the inner fjord was functionally dead.

Something had to give.

The fishing that remains in the Oslofjord is still good. Mackerel on a summer evening, pulled straight from the fjord and grilled within the hour, is one of the best things you can eat in Norway. Sea trout along the rocky islands at dawn is as close to pure angling as it gets. Crabbing with children from a dock in autumn costs nothing and produces memories that outlast any restaurant meal. For more answers about visiting the fjord, see our FAQ.

Just leave the cod alone. They have enough problems.