Structural Transformation and Value-Based Economic Resilience in Madeira's Fisheries Sector
This study reveals that Madeira's fisheries sector underwent significant physical contraction and increased specialization from 1976 to 2024, successfully preserving a substantial portion of its real economic value through a shift toward high-value, low-volatility species like black scabbardfish, despite a decline in overall diversity and a modest long-term decrease in total real landed value.
Original paper licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). This is an AI-generated explanation of the paper below. It is not written or endorsed by the authors. For technical accuracy, refer to the original paper. Read full disclaimer
The oceans around small islands are not just vast stretches of water; they are complex, constrained environments where life and livelihoods exist in a delicate balance. For the people who fish these waters, the challenge is not merely catching enough food, but maintaining a stable economy when the sea itself is unpredictable. In the world of fisheries science, researchers often look at two different ways to measure success. The first is physical: how many tons of fish are brought to shore? The second is economic: how much money is that catch actually worth? Sometimes these two measures move together, rising and falling in unison. But often, they diverge. A fleet might catch fewer fish but sell them for higher prices, or it might rely on just one or two types of fish to keep the economy afloat, even as the variety of the catch shrinks. Understanding whether a fishery is simply shrinking, or if it is changing its shape to survive, is crucial for policymakers trying to protect both the ocean and the communities that depend on it.
A new study examining the waters around the Portuguese archipelago of Madeira offers a clear, long-term look at this exact dynamic. Spanning nearly fifty years, from 1976 to 2024, researchers analyzed official records to see how the local fishing industry transformed. They did not just count the fish; they tracked the money, adjusted for inflation to see the true value, and looked at which species were being caught and how often. The goal was to determine if the sector was collapsing, adapting, or simply becoming more specialized. The findings reveal a story of significant physical contraction that was partially masked by economic shifts, resulting in a fishery that is smaller in volume but more focused on a narrow set of high-value targets.
The data shows a stark reduction in the sheer amount of fish landing in Madeira's ports. Over the forty-eight-year period, the total weight of the catch fell by 45.2 percent, dropping from 6,417 tonnes in 1976 to 3,517 tonnes in 2024. If one were to look only at the weight, the picture would be one of a sector in steep decline. However, the economic story is more nuanced. When the researchers adjusted the money figures for inflation to reflect constant prices, the total real value of the catch decreased by only 6.99 percent, falling from roughly €17.98 million to €16.72 million. This means that while the fishermen were bringing in significantly less fish, the money they earned did not drop nearly as much. The average price per kilogram of fish rose by 69.7 percent between the start and end of the study, suggesting that the industry managed to preserve much of its economic worth even as its physical output shrank.
Yet, this preservation of value came with a cost: the loss of diversity. The study found that the fishing sector became increasingly dependent on a smaller group of species. In the early years, the catch was spread across a wider variety of fish, but by 2024, the industry had concentrated heavily on just two main categories. The most dramatic shift occurred with the black scabbardfish, a deep-water species. It was the only group that saw both its quantity and its total real value increase over the study period, with landings rising by 117 percent and value rising by 76.3 percent. In contrast, other important groups, such as tuna and similar species, saw their landings drop by 75 percent, even though their prices rose. The result is a fishery that is now far more specialized, with the black scabbardfish and tuna together accounting for the vast majority of the economic value, while the variety of other species has steadily faded.
This shift toward specialization has changed the stability of the industry. The black scabbardfish, which now dominates the catch, proved to be the most stable category, showing the least year-to-year fluctuation in both quantity and value. Tuna, while still economically vital, remained highly volatile, with its catch numbers swinging wildly from year to year. The researchers noted that the industry's ability to buffer against bad years has weakened because it relies on fewer types of fish. In the past, if one species had a bad season, others might have compensated. Now, with the portfolio of catches narrowed, the entire system is more exposed to the fortunes of just a few species. The study explicitly states that this economic resilience—keeping the money steady despite fewer fish—does not mean the industry is more profitable or that the fishers are better off, nor does it guarantee the health of the fish stocks themselves. It simply describes a structural change where value has been maintained through specialization and higher unit prices, even as the physical volume of the catch has contracted significantly.
The researchers were careful to distinguish between what the numbers showed and what they could prove about the causes. They found no evidence of a smooth, steady decline in total landings over the entire period; instead, the drop was uneven, with a peak in the late 1980s followed by a general downward trend. They also found that while the real value of the catch held up better than the weight, it did not grow; it actually showed a modest negative trend over the long run. The increase in the price per kilogram was not a steady climb but rather a result of the changing mix of what was caught. The study concludes that Madeira's fisheries have undergone a structural transformation: they are physically smaller and more concentrated, but they have managed to retain a substantial portion of their economic value. This outcome highlights a trade-off where the sector has become more efficient at generating value from a narrower base, but at the risk of losing the safety net that a diverse catch once provided. For the future, the challenge lies in understanding whether this specialized path is sustainable without the broader buffer of a diverse ecosystem and a wider range of commercial options.
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