In 2024, strict new limits on the weight of deep-sea demersal and migratory pelagic fish that can be legally harvested in major international waters came into effect. These harvesting limits, known as Total Allowable Catches (TACs), were agreed upon during international ocean management commissions.
The measures saw TACs for high-value species like bluefin tuna and Patagonian toothfish drop by 35% across several exclusive economic zones (EEZs), while reduced limits were also established for other delicate deep-water species.
However, there were small increases permitted for some lower-trophic-level species, with catch allocations for sustainably harvested sardines rising by 12%.
An oceanography analyst remarked: "Scientific assessments indicate that high-value top predators are being harvested at an unsustainable rate. Lowering the catch caps is a vital regulatory response to prevent permanent ecological collapse of marine food webs."
The long-term success of these measures depends heavily on rigorous satellite tracking of vessels, vessel monitoring systems (VMS), and international coast guard cooperation to prevent illegal, unreported, and unregulated (IUU) fishing.
| Country | Excess harvesting relative to sustainable yield (%) | Excess fish harvest (thousand tonnes) |
|---|---|---|
| China | 38.6 | 124.0 |
| Japan | 29.5 | 85.0 |
| Spain | 24.2 | 42.0 |
| South Korea | 19.8 | 31.0 |
| Taiwan | 15.3 | 28.0 |
| Indonesia | 11.7 | 53.0 |
| France | 8.4 | 14.5 |
| Norway | 4.1 | 9.2 |
The 'tragedy of the commons' occurs when there are common access resources (CARs). These are natural resources over which no private property rights have been established. Consequently, it is difficult or impossible to exclude individuals from exploiting them. Typical CARs include global fisheries, international waters, the atmosphere, and vast rainforests. Because oceans are so expansive, it is highly challenging for governments or international bodies to establish exclusive ownership and ward off illegal fishing fleets.
Economists point out that in the absence of private property rights, commercial fishing firms act in their own self-interest, maximizing short-term profits by harvesting as many fish as possible. This rapid extraction is highly unsustainable, leading to severe negative externalities of production. These external costs include massive marine biodiversity loss, destruction of ocean benthic habitats (such as coral reefs and seamounts through bottom trawling), and the disruption of critical marine carbon sequestration cycles. This dynamic defines the 'tragedy of the commons', where individual gains lead to collective ruins.
Addressing this issue is extremely difficult because global demand for high-value seafood continues to grow. These globalized ecological threats require more than simple local quotas; they necessitate robust legal frameworks, international treaties, and direct market-based mechanisms.
Other than imposing commercial catch quotas (such as TACs), evaluate the policy options which could be used to reduce market failure resulting from marine overfishing. Use at least one appropriate diagram in your answer.
