An octopus pot is a small, hollow trap designed to catch octopuses by exploiting their natural instinct to seek out enclosed spaces for shelter. Unlike most fishing traps, octopus pots don’t always need bait. An octopus crawls inside because the pot looks like a safe den, then gets hauled up with the line before it can escape. These simple devices are one of the oldest and most widely used methods for harvesting octopus commercially, especially across the Mediterranean, the Iberian Atlantic coast, and parts of the Pacific.
How an Octopus Pot Works
Octopuses are intelligent, soft-bodied animals that spend much of their time looking for tight, dark spaces to hide in. Crevices in rocks, empty shells, and gaps in coral all serve as dens where they rest, digest food, and avoid predators. An octopus pot mimics these natural shelters. When an octopus encounters one on the seafloor, it enters through a small opening and settles inside. Because the pot feels like a secure hiding spot, the octopus often stays put rather than fleeing, even as the pot is lifted to the surface.
The Food and Agriculture Organization classifies pots as a subtype of trap gear. While many pot designs rely on bait to lure their target species, octopus pots can work with or without it. Research on Mediterranean pot fisheries has found that pot shape, color, entrance size, and volume all significantly influence catch rates for octopus, meaning fishers can fine-tune their gear to target octopus specifically.
Design, Size, and Materials
A typical octopus pot on the North Atlantic Iberian coast is cylindrical, roughly 35 centimeters long (about 14 inches), with an entrance diameter of around 11 centimeters (4.3 inches) and a weight of about 520 grams. That’s light enough for one person to handle but heavy enough to stay put on the seafloor, especially once weighted.
Traditionally, octopus pots were made from fired clay, and clay pots are still used in some artisanal fisheries. Modern commercial pots, however, are almost always made from high-density polyethylene (HDPE) or PVC plastic. In Portugal, a single pot costs between roughly 1 and 3.50 euros, depending on whether it comes empty or pre-filled with a cement base that anchors it on the bottom. The low cost per unit matters because fishers deploy them in large numbers.
How Pots Are Deployed
Octopus pots are rarely set individually. Fishers typically attach them to a long groundline, creating a “string” of pots that stretches across the seafloor. A string usually contains 10 to 20 pots for initial fishing, though experienced operators sometimes run longer strings. Individual pots are spaced at least 20 fathoms apart (about 36 meters or 120 feet) to prevent their effective fishing zones from overlapping while keeping the total line length manageable. Each end of the string is marked with a surface buoy so the fisher can locate and retrieve the line.
Retrieval is straightforward. The fisher pulls up the groundline, checks each pot, removes any octopus inside, and resets the string. Because octopus pots are passive gear, they sit and fish on their own between hauls, requiring no fuel-burning trawling or active pursuit.
Where Octopus Pots Are Used
Pot fishing for octopus is especially common along the coasts of Portugal, Spain, Morocco, and other Mediterranean and Northeast Atlantic nations, where the common octopus is a high-value commercial species. In the Pacific, octopus is frequently caught as incidental bycatch in pot fisheries targeting other species like Pacific cod. NOAA data from the Gulf of Alaska shows that the highest octopus catch rates come from cod pot fisheries in the central and western Gulf. Japan and parts of Southeast Asia also have long traditions of pot-based octopus harvesting.
Why Pots Are Considered Low-Impact Gear
Compared to bottom trawling, octopus pots cause far less damage to marine habitats and produce dramatically less bycatch. A trawl net drags across the seafloor, scooping up everything in its path. Pots sit in one spot, and only animals that voluntarily enter get caught.
The difference in survival rates for non-target catch is striking. Research on Alaska groundfish fisheries found that over 90% of octopus discarded from pot vessels were alive and in excellent condition. By contrast, octopus caught in trawl gear had immediate mortality rates of 68 to 94%, with most animals dead or badly injured by the time they reached the deck. Pot-caught animals also tend to be larger, which suggests the small entrance openings naturally exclude juveniles, a built-in form of size selectivity that trawl nets lack.
The Problem of Lost Pots
The biggest environmental concern with octopus pots is what happens when they’re lost. Because modern pots are made from durable plastic, a pot that breaks free from its groundline during a storm or gets cut loose by another vessel’s gear can persist on the seafloor for years. A lost pot doesn’t stop fishing. It continues to trap octopuses and other marine life indefinitely, a phenomenon known as “ghost fishing.”
Ghost pots trap and kill both target and non-target species, damage underwater habitats, and contribute to marine debris. Regulations in some fisheries require escape mechanisms to reduce this risk. In Alaska, for example, all pot gear must include a panel secured with untreated cotton twine. If the pot is lost, the cotton eventually degrades and the panel opens, allowing trapped animals to escape. The twine cannot be treated or reinforced in any way that would slow its breakdown.
On the Iberian coast, the sheer volume of plastic pots in use has created a separate pollution problem. Researchers have described lost and discarded octopus pots washing up on beaches and dunes as “a plague of plastic,” since the cheap HDPE and PVC materials fragment into smaller pieces over time but never fully biodegrade.
Octopus Pots vs. Other Fishing Methods
Pot fishing sits in a middle ground between highly selective but labor-intensive hand-harvesting methods (like spearfishing or hand-gathering) and industrial-scale trawling. Pots are passive, require relatively little fuel, and produce minimal bycatch. They’re also simple to build and inexpensive, making them accessible to small-scale fishers who can’t afford trawl vessels.
The tradeoff is volume. A trawl can harvest far more octopus per trip than a string of pots. For large commercial operations chasing high tonnage, trawling is more efficient despite its ecological costs. But for coastal communities and artisanal fisheries where sustainability and product quality matter, pots remain the preferred tool. Pot-caught octopus arrives on deck alive and undamaged, which commands higher prices at market compared to trawl-caught animals that are often crushed or killed during capture.