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

The research elucidates the grim fate that awaits sharks captured in fishing nets. Many of these astonishing creatures endure hooks, scars, and other reminders of brutal encounters with fishermen. For instance, the tropical waters of the Bahamas have garnered attention for being a sanctuary of protection for sharks, as it has been illegal to catch them since 2011. However, even in these protected areas, the presence of fishing continues to threaten shark populations indirectly. The study illustrates how it is not just the targeted shark species facing these dangers, but also countless others caught incidentally and subsequently discarded, illustrating the larger implications of fishing on shark population dynamics.

A significant revelation from the study involves the high mortality rates of small sharks and threatened species. Producers of the research compiled and analyzed data from over 150 published studies and reports, revealing alarming statistics about the chances of survival for sharks caught by fisheries. Certain species, like smoothhound sharks, exhibited mortality rates ranging from 30 to 65 percent, illustrating a dire outlook for species in peril. This high emergence of death, often caused by rigorous capture practices that fail to take into account the biological and ecological characteristics of these complex fish, adds complexity to conservation efforts. The researchers noted that smaller shark species tend to fare worse when caught due to their anatomical structure and the physiological demands of their respiratory systems.

Intriguingly, the study’s researchers discovered that sharks dwelling in deeper waters suffered disproportionately from pressure changes associated with capture. The physiological trauma that arises during drastic pressure shifts can be catastrophic, resulting in death shortly after release. These findings compel us to rethink our approaches to shark conservation, particularly when taking into account environmental factors that can drastically affect shark survival. As studies reveal, some sharks require a constant swimming motion to maintain their breathing, a fact that directly affects their chances of survival after being caught. Their intricate biology must be considered in the creation of effective and comprehensive conservation policies.

Within the regulatory framework, retention bans have been implemented to mitigate shark populations’ decline. These mandates instruct fishermen to release sharks when caught, yet the study highlights the insufficiency of these measures when done alone. The research indicates that while retention bans can significantly reduce shark mortality, complementary strategies are critical to fostering healthy populations. These strategies should not only include stringent retention policies but also spatial regulations to protect vital habitats such as nurseries and pupping grounds.

The authors of the research posited an essential question: How many shark species succumb to death due to fishing practices, whether upon landing or shortly after release? By collating empirical data from a diverse range of sources, they could estimate mortality rates for numerous additional shark species that remain undocumented in existing literature. This diligence exemplifies an urgent need for comprehensive data collection of shark-related mortality for broader management strategies to be developed adequately.

One of the pivotal messages gleaned from this important study is the recognition of the urgent need for integrated shark conservation approaches. Researchers assert that policies needing to be implemented must arise from a thorough understanding of the complexities surrounding shark biology and ecology. Wild populations can only thrive when they are safeguarded from overfishing and targeted marine exploitation through an array of concerted efforts by jurisdictions and collective regulatory bodies.

Attention also turns toward the role of commercial value in determining conservation priorities. Species such as blue sharks and bonnetheads have quicker reproductive cycles, allowing their populations to rebound more swiftly under protective measures. However, commercially sought species like the blue shark continue to be heavily exploited, raising the moral dilemma of conservation amidst economic viability. Finding a balance between these competing interests remains an enduring challenge, emphasizing that conservation efforts must align with stakeholder engagement and a genuine commitment to preserving marine biodiversity.

A noteworthy aspect of this research is the spotlight it casts on the broader class of cartilaginous fishes, including rays and skates. The majority of these species face significant threats to their existence as well, yet the data on their mortality rates remains alarmingly sparse. This acknowledgement amplifies the urgency for comprehensive research and policy initiatives focused not just on sharks but on the entirety of the elasmobranch population. The lack of available data on species beyond sharks calls for a unified commitment to preserving all cartilaginous fish in the face of dwindling marine biodiversity.

As scientists from The Nature Conservancy collaborate with organizations such as the Inter-American Tropical Tuna Commission, emphasis is placed on harmonizing efforts in shark conservation. By utilizing data-driven approaches, they can expand on legislative frameworks to ensure the sustainability of shark populations for future generations. These global dialogues will shape conservation strategies tailored to the specific needs of marine ecosystems while also addressing the multifold challenges posed by human activities.

The immediate obligation to protect these iconic species goes beyond ethical considerations; it is crucial for the ecological balance of our oceans. Sharks are not merely fascinating creatures of the deep; they are integral players in maintaining marine health and stability. Warning sirens should ring across global communities as we advance to address the looming threat of shark extinction, a biological crisis echoing at the heart of our oceans. Without significant actions now, we risk losing species that have roamed the earth’s waters for millions of years.

In conclusion, the research presented by UC Santa Barbara’s team serves as a clarion call for immediate and comprehensive action directed towards shark conservation. Adopting multifaceted management strategies must become a priority if we are to strive for thriving oceans and vibrant marine ecosystems. Only through global recognition of the intrinsic value of sharks will we ensure their survival amid the challenges they face and create a future where these majestic creatures can flourish once again.

The responsibility lies within our collective hands, calling forth a concerted effort that aligns scientific insights with legislative action and public awareness to reclaim a brighter, more sustainable future for sharks across the world’s oceans.

Subject of Research: Shark Conservation and Fishing Impact
Article Title: Retention Bans Are Beneficial but Insufficient to Stop Shark Overfishing
News Publication Date: 3-Mar-2025
Web References: Nature Conservancy
References: Fish & Fisheries Journal
Image Credits: Shane Gross

Keywords: Shark conservation, overfishing, fishing management, marine ecology, species extinction, cartilaginous fishes.