Most of the seafood on your plate comes from one of two sources: wild-capture fisheries, where boats harvest fish and shellfish from oceans, rivers, and lakes, or aquaculture, where seafood is raised on farms. As of 2022, aquaculture surpassed wild fishing for the first time in history, producing 51 percent of the world’s aquatic animals. The global total hit 185.4 million tonnes of aquatic animals that year, split between 94.4 million tonnes from farms and 92.3 million tonnes from wild catch.
But the journey from water to plate is rarely straightforward. Seafood is one of the most globally traded food products, and a single piece of fish may be caught in one country, shipped to another for processing, and sold in a third. Understanding where your seafood actually comes from means following it through a surprisingly complex global supply chain.
Wild-Caught Seafood: Oceans, Rivers, and Coasts
Wild-caught seafood comes from commercial fishing fleets operating across every ocean and many freshwater systems. Large commercial vessels use methods like trawling (dragging nets along the ocean floor or through open water), longlining (setting miles of baited hooks), and purse seining (encircling schools of fish with a large net). Smaller-scale boats use traps, pots, and handlines, particularly for species like crab, lobster, and reef fish.
The biggest wild fisheries are concentrated in the Pacific Ocean. Alaska pollock, one of the most harvested fish in the world, comes from the North Pacific and ends up in everything from fish sticks to imitation crab. Tuna species are caught across the Pacific, Atlantic, and Indian Oceans by fleets from dozens of nations. Cod and haddock come primarily from the North Atlantic and North Pacific. Sardines, anchovies, and herring are harvested in enormous volumes from coastal waters worldwide, much of it turned into fishmeal to feed farmed fish.
Farmed Seafood: How Aquaculture Works
Aquaculture now produces more seafood than wild fishing, and it takes many different forms depending on the species. Salmon are typically raised in ocean net pens, large mesh enclosures anchored in coastal waters where seawater flows freely through the farm. Shrimp and tilapia are more commonly grown in semi-enclosed or fully enclosed ponds, often inland, where farmers control water quality and feeding. Shellfish like mussels, oysters, and scallops grow on ropes, cages, or racks suspended in coastal waters, a method sometimes called longline aquaculture.
A newer and more expensive approach uses fully enclosed recirculating systems on land. These tanks filter and recycle water, producing very little waste discharge. Species farmed this way include salmon, Arctic char, tilapia, and sea bass. Nearly all farmed seafood starts in hatcheries, where eggs are hatched and young animals grow to a juvenile stage before being transferred to their final growing environment.
Where Popular Species Originate
The specific species on your plate largely determines where it came from. Shrimp is the most consumed seafood in the United States, and the vast majority of it is farmed. Asian countries, particularly India, Indonesia, Vietnam, and Thailand, along with Ecuador, supply most of the shrimp sold in the U.S. market. These operations are predominantly pond-based farms in tropical coastal areas.
Atlantic salmon sold in the U.S. is almost entirely farm-raised. Canada, Norway, and Chile are the primary suppliers, raising salmon in ocean net pens in cold, sheltered coastal waters. Wild-caught Pacific salmon (sockeye, king, pink) comes mainly from Alaska. Canned tuna is wild-caught, harvested by industrial fleets in the open Pacific and Indian Oceans, then processed and canned in countries like Thailand, Ecuador, and Indonesia. Tilapia, now one of the most popular farmed fish globally, comes overwhelmingly from China, Indonesia, and Latin America.
How Seafood Gets to Your Plate
The seafood supply chain has more steps than most people realize. For wild-caught fish, the process begins on a commercial vessel. Once harvested, the catch is brought to port, where landing documents record the species, weight, and origin. From there, primary processors head, gut, and clean the fish. Secondary processors turn it into consumer-ready products: fillets, frozen portions, canned goods, or smoked products. Wholesalers and distributors then move these products to grocery stores, restaurants, and food service operations.
One of the least visible steps in this chain is international processing. A significant amount of seafood caught in American or European waters is shipped to processing facilities overseas, particularly in China’s Shandong province, where labor costs are lower. The fish is filleted, deboned, repackaged, and shipped back. This means a piece of Alaskan pollock might travel to China and back before landing in a fish stick on your plate. Squid, pollock, baby clams, and crab are among the products commonly processed this way. Roughly 70 percent of the seafood consumed in the U.S. is imported, and NOAA estimates that 75 to 90 percent of total U.S. seafood consumption comes from imported products when you factor in this kind of re-exported processing.
Environmental Footprint Varies Widely
Not all seafood carries the same environmental cost. A Johns Hopkins study published in Global Environmental Change evaluated the ten most consumed seafood products in the U.S. across energy use, freshwater use, and greenhouse gas emissions. Sockeye salmon, frozen Alaska pollock, and canned tuna had the lowest overall environmental impacts. The differences between species and production methods were large enough that the researchers emphasized the importance of evaluating seafood by specific type rather than lumping it into a single category.
As a broad protein category, seafood performs better than beef but overlaps with pork and poultry, meaning some seafood choices have a higher carbon footprint than chicken while others are significantly lower. The distance seafood travels matters too. Because so much U.S. seafood is imported, transportation adds substantially to carbon footprints. Legumes and plant-based proteins still have the lowest footprint of any protein source.
Knowing What You’re Actually Buying
Seafood fraud, where a cheaper species is mislabeled as a more expensive one or the country of origin is falsified, has been a persistent problem. Landing documents can be falsified if port authorities don’t maintain tight compliance. To combat this, the industry is increasingly turning to traceability technology. GPS trackers and RFID tags attached to shipments capture location data throughout the supply chain. Some companies use blockchain-based systems that create permanent, tamper-resistant records at every stage from harvest to retail.
For consumers, the most practical tools are QR codes on packaging that link to origin and handling information. These digital “passports” are becoming more common on premium seafood products. Country-of-origin labeling is required on raw seafood sold in U.S. grocery stores, along with whether it was wild-caught or farm-raised. Restaurants, however, are not required to provide this information, which is where much of the opacity in the supply chain persists.
If tracing origin matters to you, buying domestically caught or farmed seafood shortens the supply chain considerably. Alaska wild salmon, Gulf shrimp, and Atlantic sea scallops from New England are among the most reliably sourced American seafood products, with well-documented fisheries management and shorter paths from water to market.