Understanding the Value of Shark Fins and Fin Rays

Shark fins are among the most expensive seafood products in the world, driven almost entirely by demand for shark fin soup – a traditional delicacy in many East Asian countries. But what exactly makes these fins so valuable? The answer lies in the thin, translucent strands inside the fin known as fin rays. Understanding the anatomy, processing, trade, and conservation concerns around shark fins and fin rays is essential for anyone studying fish by-products and their utilization.

What are shark fins and fin rays? 🔗

Unlike most fish, sharks have skeletons made entirely of cartilage rather than bone. Their fins – dorsal, pectoral, pelvic, anal, and caudal – are supported internally by thin, needle-like structures called fin rays, also known as ceratotrichia. These fin rays are composed of a structural protein called elastoidin, which belongs to the collagen family but has unique properties that distinguish it from typical collagen found in other animals.

The fin rays run from the base of the fin towards the tip, lying side by side and supported by a cartilaginous structure called the platelet. A layer of skin covers the entire fin. When cooked and prepared properly, the fin rays produce the characteristic translucent, gelatinous strands that are the key ingredient in shark fin soup. Each shark typically has eight fins: two dorsal fins, two pectoral fins, two pelvic fins, one anal fin, and the caudal (tail) fin.

Why are fin rays valued? 🔗

The entire commercial value of shark fins rests on the quality of the fin rays inside them. Fin rays are prized for their unique texture – they are soft yet slightly chewy when prepared, and they readily absorb the flavours of the broth or stock they are cooked in. This flavour-absorbing quality is what makes them the centrepiece of shark fin soup, which is typically prepared with rich chicken or seafood broth, ginger, and rice wine.

Shark fin soup has a long cultural history. According to Shark Stewards, it dates back to China’s Song Dynasty over 1,000 years ago and was originally prepared exclusively for emperors and nobility. Today, it is commonly served at banquets, weddings, and business dinners across China, Hong Kong, Taiwan, Singapore, and other parts of Southeast Asia. A single bowl can cost anywhere from $100 to $500, making it a symbol of wealth and generosity.

Nutritional reality of fin rays 🔗

Despite their high price, shark fin rays offer very little nutritional value. Research on the physico-chemical properties of shark fins has shown that the essential amino acid score of elastoidin is less than half that of casein (a common food protein reference). The fin rays are primarily collagen-type protein with negligible fat and minimal vitamins or minerals. In other words, the appeal of shark fin is almost entirely about texture and cultural significance – not nutrition.

Additionally, studies have raised concerns about the presence of mercury and other heavy metals in shark fins. Because sharks are apex predators with long lifespans, toxins accumulate in their tissues through a process called bioaccumulation. This means that consuming shark fin products may actually pose health risks rather than provide health benefits.

Which sharks are used for fin collection? 🔗

Not all sharks are equally suitable for fin collection. Generally, fins are collected only from larger sharks – typically those over one metre in length – because bigger fins yield more and higher-quality fin rays. Some of the commonly targeted species include blue sharks, hammerhead sharks, mako sharks, and dusky sharks.

The dorsal fin, pectoral fins, and the lower lobe of the caudal fin are considered superior quality compared to other fins. These fins are larger, contain more fin rays, and produce a better texture when processed. The grading of fins is based on several factors: size, colour, thickness, and the overall quality of the fin rays contained within them. Light-coloured fins are generally considered higher quality than darker ones, and fins classified as “white” varieties yield nearly double the quantity of rays compared to “black” varieties.

How are shark fins preserved and processed? 🔗

Processing shark fins into a usable product is a multi-step operation that requires careful handling at each stage. The goal is to preserve the fins, extract the fin rays, and prepare them for cooking or sale.

Step 1: Harvesting and cleaning 🔗

Fins must be collected from freshly caught sharks as quickly as possible. They are cut at the base using a knife, and any flesh adhering to the cut surface is trimmed away. The fins are then washed thoroughly to remove blood and other residues.

Step 2: Salting and drying 🔗

The most common preservation method is dry salting. Common salt is applied at a ratio of approximately one kilogram per ten kilograms of fresh fins. The salt draws out moisture, creating conditions that prevent bacterial growth. After salting, the fins are dried – either by hanging in well-ventilated areas or using drying chambers. The Codex Alimentarius standard for dried shark fins specifies that the final product should have a moisture content not exceeding 18%, be free from foreign material, and show no signs of decomposition. When properly dried, the fins become stiff, hard, and shrunken, and can be stored for several months.

Step 3: Grading 🔗

Processed fins are graded based on size, colour, thickness, and fin ray quality. Larger fins from bigger sharks fetch significantly higher prices. Light-coloured, undamaged fins with thick, well-formed rays command premium rates. The graded fins are packed in cartons or plastic-lined sacks for storage and transport.

Step 4: Extraction of fin rays 🔗

The ultimate objective of processing is to separate the fin rays from the rest of the fin – including skin, cartilage, and connective tissue – without damaging the rays. Several methods are used for this:

Boiling and skin removal: The dried fins are soaked and then boiled to soften the tissues. In some methods, the boiled material is buried in sand on a beach for 12-15 hours, which further softens the skin for easy removal. The material is then boiled again to complete the separation.

Acid treatment: Research on fin ray extraction describes a process where rays are treated with acetic acid to soften the surrounding tissue, after which the rays are separated by hand and dried. This method is considered efficient and produces clean, high-quality rays.

The extracted fin rays appear as light yellowish, semi-transparent strands – sometimes called fin needles. These are the final product sold commercially or used directly in cooking.

The global shark fin trade 🔗

The shark fin trade is a multi-billion dollar global industry with complex supply chains connecting fishing communities in developing countries to luxury restaurants in major cities. Dried shark fin is the most expensive seafood product by weight, creating a powerful economic incentive for fishermen – particularly in countries like Indonesia, India, the Philippines, and across Africa and Latin America – to target sharks specifically for their fins.

Hong Kong has historically been the world’s largest hub for shark fin trade, handling an estimated 50% or more of the global supply. Major supplying nations include Indonesia, India, Spain, Taiwan, Mexico, and several European countries. Top-grade fins from large sharks can sell for hundreds of dollars per kilogram at wholesale, while a single large shark may yield fins worth several hundred dollars – sometimes representing weeks of income from other fishing activities for a coastal fisherman.

The practice of shark finning 🔗

The high value of fins relative to shark meat has given rise to a particularly wasteful and controversial practice known as shark finning. This involves removing the fins from a captured shark – often while the animal is still alive – and discarding the body at sea. Without its fins, the shark cannot swim and eventually drowns, bleeds to death, or is consumed by other predators. Fishermen prefer this method because fins are small, lightweight, and easy to store, while shark meat is bulky and relatively low in value.

The United States banned shark finning in its federal waters through the Shark Finning Prohibition Act of 2000, followed by the Shark Conservation Act of 2010, which requires sharks to be landed with fins naturally attached. Most recently, the Shark Fin Sales Elimination Act signed in December 2022 banned the commercial trade of detached shark fins in the United States entirely.

Conservation concerns and sustainability 🔗

The global demand for shark fins has contributed to severe population declines across many shark species. Some populations have dropped by as much as 60-80% over the past several decades. This is especially alarming because sharks have what biologists call a K-selection life history – they grow slowly, mature late (often not until 10-20 years of age), and produce relatively few offspring. These biological traits make shark populations highly vulnerable to overfishing and slow to recover even when protections are put in place.

Ecological impact 🔗

Sharks are apex predators that play a critical role in maintaining healthy marine ecosystems. When shark populations decline, it can trigger cascading effects throughout the food web. Their prey species may increase unchecked, which in turn can over-consume other organisms further down the chain. This disrupts the balance of entire marine ecosystems, including coral reef systems that depend on healthy predator-prey relationships.

International regulatory efforts 🔗

The Convention on International Trade in Endangered Species (CITES) has been a key mechanism for regulating the shark fin trade. In 2013, five threatened shark species were listed on CITES Appendix II, meaning their trade requires permits and proof that it is not detrimental to the species’ survival. However, research published in 2024 found that 81% of shark fin-exporting nations had never reported any trade of these listed species, suggesting widespread illegal and unreported trade despite the regulations.

More recently, the CITES CoP20 meeting in 2025 marked a major step forward by granting the critically endangered oceanic whitetip shark an Appendix I listing – effectively a full commercial trade ban. Additional species including manta rays, devil rays, and whale sharks also received stronger protections. Over 50 governments co-sponsored these proposals, and conservationists have described the outcome as the most ambitious package of shark and ray protections ever adopted at CITES.

Alternatives and the future of shark fin products 🔗

Given the conservation crisis, there has been growing interest in artificial or imitation shark fins as substitutes. Because the fin rays are essentially collagen fibres valued for texture rather than flavour, manufacturers have developed alternatives using other types of collagen, starch, and plant gums that mimic the gelatinous texture of real fin rays. These products are already available in some markets, particularly in East Asia, though they have yet to fully replace demand for the genuine product.

Consumer awareness campaigns have also played a role in reducing demand. Many hotels, restaurant chains, and airlines across Asia have removed shark fin soup from their menus. Several countries and territories – including India, which is one of the world’s largest shark-fishing nations – have implemented various levels of restrictions on shark finning and fin trade.

The future of shark fin as a by-product depends on whether sustainable, well-managed fisheries can supply the market without further depleting shark populations – and whether cultural shifts continue to reduce overall demand.

What do you think? Given that shark fin rays have minimal nutritional value and their harvest threatens global shark populations, should the focus shift entirely to artificial alternatives? And how can fishing communities that depend on the shark fin trade be supported through this transition?

References

1. https://onlinelibrary.wiley.com/doi/10.1002/jmor.1051540202
2. https://sharkstewards.org/end-shark-finning/shark-finning-and-shark-fin-faqs/
3. https://digitalcommons.uri.edu/theses/997/
4. https://en.wikipedia.org/wiki/Shark_finning
5. https://www.fisheries.noaa.gov/s3/2023-12/Dried-Shark-Fins.pdf
6. https://aquadocs.org/handle/1834/33641
7. https://www.fisheries.noaa.gov/feature-story/how-our-shark-finning-ban-helps-us-sustainably-manage-shark-fisheries
8. https://pmc.ncbi.nlm.nih.gov/articles/PMC12588279/
9. https://oceanographicmagazine.com/news/oceanic-whitetip-sharks-win-historic-trade-ban-in-major-cites-push/