The Tin Tuna Index was developed by the Human Intelligence Unit at The State of the Mind as a cross-country living wage measurement instrument resistant to inflation distortion. Its field methodology is simple: what is the price of the cheapest available tin of tuna in a standard retail outlet, and how many minutes of minimum-wage labour does a worker need to perform in order to buy it? In Mauritius in July 2026, the answer was Rs 15.00 for a 170-gram tin of Tropical Flake Brine tuna, which at the national minimum wage of Rs 17,110 per month — approximately Rs 102 per hour — represents 10.9 minutes of labour. That tin contains fish processed in Mauritius from tuna caught in the Indian Ocean, by vessels that are overwhelmingly not Mauritian, and sold to European supermarkets at prices that the Mauritian processor negotiated with European buyers on terms that the artisanal Mauritian fisherman had no part in setting. The same supermarket sold Oreo fish fillets imported from China at Rs 235 for three to four pieces. The paradox is not the Rs 15.00 tin. The paradox is what it takes to produce it and who captures the value at each stage of the chain.

The observable contradiction is this. Mauritius possesses an Exclusive Economic Zone of 2.3 million square kilometres — one of the largest oceanic territories in the South-West Indian Ocean region relative to the country's land area. The Indian Ocean is considered the second largest stock of tuna resources in the world. Mauritius has built, around the tuna that passes through its EEZ and its port, a processing industry that contributes approximately 19 per cent of national export value, employs some 29,000 people across the fishing, processing, marketing, and ancillary sectors, and exports canned tuna to the European Union at volumes that make it one of the two largest ACP exporters in that market. Exports of fish and fish products reached Rs 13 billion by 2020, up from Rs 8.1 billion in 2010.

And yet the same country imports 50 per cent of its fish and fisheries products for domestic consumption, according to the Ecofish Programme's fisheries management assessment for Mauritius. It imports frozen fish from China. Its artisanal fishermen, who number approximately 13,000 and who fish the same EEZ whose tuna resources the processing industry depends on, operate without a functioning auction market, without standardised price transparency mechanisms, and without the market intelligence that would allow them to know whether the price a local buyer offers for their morning catch reflects the actual value of that catch in the supply chain that it will subsequently enter. The bad weather allowance — the daily subsistence payment to fishermen who cannot put to sea — stood at Rs 340 per day at the last recorded rate. The national minimum wage is Rs 17,110 per month, implying a daily rate of approximately Rs 657 on a 26-working-day basis. The bad weather allowance is 52 per cent of the minimum daily equivalent.

The first constraint is structural and concerns who actually fishes in the Mauritius EEZ. The Mauritius Ports Authority is candid about this in its Seafood Hub documentation: most of the tuna fishing in the EEZ is carried out either by European purse-seiners or East and South East Asian long-liners. The EEZ belongs to Mauritius in international law. The fish that swim in it are, in practice, caught by foreign industrial fleets operating under access agreements. Those fleets land their catch at Port Louis, where it enters the processing facilities of the Mauritian tuna canning industry. The processing happens in Mauritius. The value addition of canning and preparation happens in Mauritius. But the fish itself — the raw material that the entire industry depends on — is supplied by foreign industrial vessels whose economics are determined in European and Asian fishing company boardrooms, not in Mauritius.

The second constraint is the absence of market infrastructure for the domestic fisherman. The value chain analysis of artisanal fisheries in Mauritius, conducted for the CRFM, documented the problem precisely: there is no functioning fish auction market, no standardised price transparency mechanism, and no system through which artisanal fishermen can access the market intelligence that would allow them to negotiate the price of their catch rather than accepting whatever the local buyer offers. The artisanal fisherman operates in a bilateral negotiation with a local buyer who has better price information, better capital, better cold storage, and better access to the downstream supply chain. The information asymmetry is structural. The previous government proposed an online and physical fish auction market. It was not implemented.

The third constraint is the processing industry's orientation toward export rather than domestic supply. The industry that processes Mauritian-landed tuna into canned products exports approximately 90 per cent of its output to Europe. The Rs 15.00 tin of Tropical Flake Brine tuna in the Mauritian supermarket is priced for the domestic market at the margin of a supply chain whose primary orientation is the EU export market. The domestic consumer is not the industry's primary customer. They receive what is left after the export commitment is met, priced at whatever the domestic market will bear rather than at whatever a competitive domestic fish market would produce.

Multiple corrections have been attempted. The Seafood Hub strategy, promoted by the Mauritius Ports Authority and the Economic Development Board, sought to position Mauritius as a regional centre for fish transhipment, processing, storage, and cold chain logistics — capturing more of the value chain that currently flows through Port Louis without leaving significant economic benefit for the domestic fishing community. The strategy succeeded in its own terms: the industry grew, exports increased, and the port's fish handling capacity expanded toward a target of 250,000 tonnes per annum. What it did not address was the distributional question: who within Mauritius captures the value that the processing industry generates.

The artisanal fisheries correction — the proposed auction market, the bad weather allowance, the FAD programme that encouraged lagoon fishermen to move to offshore fishing to increase catch and income — addressed a different and more fundamental problem: the collapse of marine capture production. Marine capture declined by 11 per cent in the period covered by the most recent assessments. The artisanal catch is shrinking. The industrial processing volumes are maintained by foreign fleet supply rather than domestic catch. The correction for the artisanal fisherman and the correction for the processing industry are not the same correction and have not been pursued as though they were connected.

The stock assessment that the previous government committed to conducting — to generate accurate data on local fish stocks within the 2.3-million-square-kilometre EEZ — was still pending completion at the time of the last recorded statement. An oceanic state whose fisheries policy is made without accurate stock assessment data for its own EEZ is making policy on the basis of assumptions rather than evidence. The correction was announced. The data it requires was not collected.

The evidence suggests that Mauritius has built a successful export-oriented tuna processing industry on the foundation of a resource — the Indian Ocean EEZ — that it owns in law but does not control in practice, whose fish stocks it has not systematically assessed, and whose industrial exploitation by foreign fleets generates employment and export revenue in Mauritius without generating the price sovereignty that would allow domestic fishermen, domestic processors, or the domestic state to set the terms of the resource's extraction.

The Tin Tuna Index field reading is the most precise domestic evidence of what this arrangement produces at household level. A 170-gram tin of tuna costs Rs 15.00 — 10.9 minutes of minimum-wage labour. This is extraordinarily cheap by any regional comparison. The cheapness is not a market triumph. It is the retail price of a commodity whose supply chain is oriented toward a European export market at Rs 250 billion per year, in an economy where the domestic consumer is the residual customer and the artisanal fisherman who might supply a competitive domestic market receives a bad weather allowance of Rs 340 per day when the sea is too rough to fish.

The Chinese fish imports — Oreo fish at Rs 235 for three to four fillets — complete the picture. Mauritius imports 50 per cent of its domestic fish consumption despite owning one of the largest EEZs in the region. It imports from China because Chinese industrial fishing in the Indian Ocean produces frozen fish at a cost that undercuts domestic artisanal production in the Mauritian retail market. The artisanal fisherman in Mauritius competes not with the industrial tuna processing sector that processes the same ocean's fish for European supermarkets, but with Chinese frozen fish imports that arrived by container from 8,000 kilometres away. This is the full geometry of the tuna paradox.