Illegal, Unreported, and Unregulated (IUU) Fishing poses a global challenge and has significant economic and environmental repercussions. The impact of IUU fishing includes economic losses, job losses,
scarcity,
price distortion,
food insecurity and
unfair competition, together with the depletion of fish populations and damages to the marine habitat. The most affected areas by this phenomenon are Africa, Asia, and Latin America.
The environmental effects of IUU fishing The environmental effects of IUU fishing include
biodiversity loss, and damages to the marine flora and ecosystem, and are generally caused by
illegal fishing methods,
overfishing and
bycatch. Illegal fishing methods usually damage the seabed and the marine flora: fishing gears, chemicals, and explosions, can affect organisms' growth and cause
sediment transport, which blocks or reduces light, endangering the growth and settlement of oysters and scallop. Examples include the use of
bottom trawling, which destroys sponges that take decades to regrow, and the use of fishing gears like
beach seines and
dynamite fishing, which highly damage the reef ecosystems and can kill up to 80% of the coral reef in the target areas. The impact on fish stock is an effect of overfishing and
overharvesting, which can damage the ecosystem biodiversity and can create an imbalance in the
food chain, thus affecting predators,
forage species, and marine mammals. In addition, the catch of high market valued species, such as tuna and sharks, contribute to the depletion of fish stocks, causing both environmental effects, and
food scarcity. which has the biggest fleet based in Port Louis and is documented as flouting the law, including human rights, worldwide multiple times on record. Mauritian fishing cooperatives also allegedly engage in Illegal, unreported and unregulated fishing and are sometimes apprehended but their movements are impossible to track. West Africa has been consistently identified as the global epicentre of IUU fishing, with estimates indicating that up to 37% of fish caught in the region are unreported or illegal. Evidence of foreign industrial fleets exploit enforcement gaps, weak governance, and limited maritime capacity to extract significant marine resources, often undermining the livelihoods of artisanal fishing communities. While West Africa has received growing scholarly and policy attention, the South Atlantic remains relatively underexplored in academic literature despite facing similar vulnerabilities. These practices contribute to the collapse of fish stocks, disrupt marine food webs, and threaten the long-term sustainability of marine biodiversity in the region. The lack of adequate monitoring means that endangered species, such as sharks, sea turtles, and marine mammals, are often caught unintentionally and discarded at sea, contributing to biodiversity loss. Furthermore, IUU fishing contributes to unsustainable levels of fishing pressure on critical species such as sardinella, horse mackerel, and hake, many of which are essential for both ecological balance and food security. The overfishing of these species has cascading ecological effects, reducing prey availability for larger marine predators and altering the structure of marine ecosystems. In many parts of the South Atlantic, particularly in Angola and Namibia, IUU fishing has also been associated with increased levels of pollution and discarded fishing gear, which exacerbate marine plastic waste and further damage fragile ocean habitats. Climate change is compounding these effects. Warmer sea temperatures and shifting fish distributions make stocks more vulnerable to IUU exploitation, particularly in upwelling zones such as the Canary and Benguela Currents. In such regions, depleted fish stocks recover more slowly due to changes in ocean productivity and nutrient flows, magnifying the long-term ecological toll of illegal fishing.
Asia-Pacific Region Overfishing and bycatching in the
Asia-Pacific region are destroying coral reefs and are depleting endangering the species by non-respecting the safe biological quota for fish replenishment. Moreover, the
destructive fishing practices in the region involve the use of
cyanide to poison reef fish: as a consequence, 56% of coral reefs in Southeast Asia are at risk, especially in the
Paracel Islands,
Indonesia,
Taiwan,
Philippines, and
Malaysia.
Oceania In
Australia, IUU fishing is affecting biodiversity, and is leading to a decrease of legal fish traps in favor of the illegal ones. Illegal fishing is endangering the species of
sea cucumber and
oysters, leading to fish depletion, and damages to the ecosystem. Bycatch is extremely frequent, endangering species like dogfish and dolphins, while trawling is damaging seagrass beds and endangering endemic species like sponges, white sharks, and stingrays. IUU fishing makes the global economy lose between $10 billion and $23 billion annually, and is valued up to $23.5 billion, placing it among the most profitable natural resource crimes. According to some studies, annual global losses due to IUU fishing account between $25 and $50 billion, tax revenues losses for countries are up to $4 billion. The major economic impacts of IUU fishing are unfair competition, job losses, declining revenues for legal fishers,
tax revenue losses for governments, poverty and
food insecurity for artisanal fishers and fishing communities,
price distortion and
overexploitation of fish stock.
Oceania In many Oceanian countries, fish highly contributes to GDP, and impacts the livelihood of domestic populations:
Indonesia and
Papua New Guinea highly suffer from economic consequences of IUU fishing. Illegal fishing presents a serious challenge to Oceanians countries, because it creates a high fish
stock depletion, and endangers marine environment. Despite an official lobster fleet of 2,900 boats, illegal catches are widespread, and in 2019 alone, over 6,000 tons were exported, generating more than US$92.5 million, regardless of legality. As the country pursues formal regulatory recognition of this trade, external demand continues to exert pressure on fragile stocks
Europe In the
Mediterranean Sea, 50% of tuna and swordfish catch come from IUU fishing, while in the North Sea 50% of cod and 60% of all catch comes from IUU fishing. In the
Baltic Sea, 40% of cod comes from illegal fishing, and in the
Iberian coast 40% of tuna, leading to an overexploitation of the resources and loss of catch for the local and legal fisheries. In Europe, countries lost up to €10 billion from IUU fishing, €8 billion for stock value, and more than 27 000 people lost their jobs. ==Certification and labeling==