(Santa Barbara, Calif.) — Shark fins have long occupied a peculiar place in the global seafood economy: rare enough to command luxury prices, yet common enough in international markets to sustain a vast and complex trade network. That demand has helped push many shark populations toward collapse. Because sharks grow slowly, mature late and produce relatively few offspring, even moderate fishing pressure can have consequences that persist for decades. Now, a new study has combined fishery, trade and regulatory data to investigate whether one of the most widely used shark protections has actually changed the global movement and consumption of shark products.
The answer, researchers say, is unexpectedly unclear. Shark-finning regulations showed no statistically significant effect on international exports, imports, domestic consumption or the number of trading partners involved in shark-product commerce. The findings do not prove that finning regulations are ineffective, but they suggest that the policies have not produced a detectable transformation in global trade flows. Published in Nature Communications, the study is the first to examine the relationship between shark-finning rules and international trade using a dataset capable of linking what fisheries catch with what countries buy and sell.
“ We evaluated a lot of different things and found that there’s really no clear-cut answer to our research question,” said co-lead author Echelle Burns, a project scientist at the University of California, Santa Barbara’s Environmental Markets Lab. The research team included scientists from UC Santa Barbara, The Nature Conservancy and Renmin University of China. Their analysis addresses a longstanding problem in conservation science: fishing activity and commercial trade are typically recorded in separate systems, measured in different units and rarely connected in a way that allows researchers to follow a product from ocean capture to final market.
Shark-finning rules are designed to stop a particularly wasteful practice. In conventional finning operations, fishermen remove a shark’s valuable fins and discard the remaining carcass, often while the animal is still alive. Since fins are more valuable by weight and take up less space than whole sharks, retaining carcasses can alter the economics of fishing. Regulations therefore commonly require vessels to keep fins attached to the body or to land fins and carcasses in specified ratios. In theory, these requirements should make shark targeting less profitable and reduce the number of sharks entering the supply chain.
The economic reality, however, is more complicated. A rule that requires sharks to be landed whole may increase the supply of shark meat, liver or oil even as it reduces the incentive to collect fins alone. That additional meat could stimulate new demand or encourage markets to expand into products that were previously less important. “If a country requires that fishing vessels must land sharks with their fins still attached, the influx of shark meat supply could stimulate a market expansion for shark products,” said co-lead author Kaiwen Wang, an economist at Renmin University of China. Such effects could offset, or even obscure, the intended impact of a regulation.
To analyze these possibilities, the researchers used the Aquatic Resource Trade in Species dataset, known as ARTIS, maintained by the University of Washington and released in 2024. The database tracks aquatic products through international trade networks and supply chains, allowing scientists to connect fisheries data with commercial records. The team combined ARTIS with econometric methods, which are statistical tools used to estimate the effects of policies while accounting for differences between countries and changes over time.
The researchers compared trade and domestic-consumption data from countries before and after they adopted shark-finning regulations. They then compared those changes with countries that had not introduced such rules, creating a control group. This approach, often used in policy evaluation, helps distinguish the potential effect of a regulation from broader forces such as changing consumer preferences, shifts in fishing capacity, economic growth or disruptions in international commerce. The analysis examined several outcomes, including imports, exports, domestic use and the number of trading relationships maintained by each country.
Across those measures, the results did not reveal a statistically significant change associated with the adoption of finning regulations. In scientific terms, the observed differences were not large or consistent enough to rule out the possibility that they arose from normal variation or other factors unrelated to the policies. The finding does not mean that every regulation failed, nor does it show that finning bans have no local benefits. Instead, it indicates that their overall influence was not clearly visible in the global trade data examined by the study.
The researchers emphasize that a null result is itself important. “This sort of null result can initially be disappointing for us as researchers,” said senior author Gavin McDonald, a senior project scientist at UC Santa Barbara’s Environmental Markets Lab. “But it is still incredibly important to share these types of findings.” A lack of measurable change can expose weaknesses in assumptions about how conservation policies work and prevent governments from relying on simplified narratives. The result also raises practical questions about enforcement, illegal fishing, reporting accuracy and whether traders can redirect products through alternative markets or trading partners.
Shark conservation is further complicated by differences among species and by the interaction of multiple policies. A finning restriction may operate alongside retention bans, import prohibitions, fishing-gear rules, catch limits and international trade controls, making it difficult to isolate the effect of any single measure. Some species may be retained for meat after capture, while others may be discarded or landed under entirely different rules. The study’s authors say that connecting regulation, fishing behavior and trade is essential for designing more effective interventions. For consumers and policymakers, the central message is striking: protecting sharks may require more than banning the most visible form of waste. It may require monitoring the entire supply chain, from the moment a shark encounters fishing gear to the point where its fins, meat or other products reach a market.
Subject of Research: The relationship between shark-finning regulations and global trade, domestic consumption, and supply-chain dynamics for shark products.
Web References: https://news.ucsb.edu/people/echelle-burns ; https://news.ucsb.edu/people/gavin-mcdonald ; https://news.ucsb.edu/2025/021801/sharks-are-dying-alarming-rates-mostly-due-fishing-retention-bans-may-help
References: Nature Communications, DOI: 10.1038/s41467-026-75625-1
Keywords: shark finning, shark conservation, fisheries management, international trade, marine conservation, regulatory policy, shark products, fisheries, conservation science, supply chains, ARTIS dataset, ocean policy
