The Great Salt Lake's Tiny Engine: Why Brine Shrimp Matter
Publishers Note: At the end of this article is a well produced 4-minute video from the Great Salt Lake Brine Shrimp Cooperative.
The next time you spot a packet of "Sea-Monkeys" on a toy store shelf, know you're looking at a cousin of one of Utah's most consequential — and most overlooked — natural resources. The brine shrimp of the Great Salt Lake (Artemia franciscana) are smaller than your fingernail. They also hold up the entire lake's food web, anchor a Utah industry valued at $40 to $60 million a year, and quietly tell us how healthy the lake is from one season to the next.
Are they unique?
Artemia species live in hypersaline waters around the world, from the Caspian Basin to coastal salt ponds in California. The Great Salt Lake isn't the only place they exist — but it is the world's single largest source. Geologic core samples show brine shrimp have been part of this basin for at least 600,000 years, predating the last shoreline of ancient Lake Bonneville. The species here, Artemia franciscana, is native to North America. They are filter feeders, eating algae and bacteria that bloom in salty water — food no fish, frog, or insect larva can compete for in this kind of brine.
Foundation for 10 Million Birds
The Great Salt Lake sits on the Pacific Flyway, and according to the Utah Division of Wildlife Resources, around 10 million migratory birds representing more than 250 species pass through each year. Many of them eat brine shrimp. The DWR has documented between 2 million and 5 million eared grebes — by some estimates roughly 90 percent of the entire North American population — stopping at the lake each fall to molt their flight feathers and refuel. During molt the birds cannot fly. They are completely dependent on what the lake offers, and what it offers is brine shrimp. Each grebe eats 20,000 to 30,000 of them a day, doubling its body weight before continuing south. Wilson's phalaropes, American avocets, and northern shovelers all feed on brine shrimp or their cysts (eggs) as well.
Utah Industry That Feeds the World
Commercial brine shrimp harvesting on the Great Salt Lake began in 1950 and today is regulated by the DWR under Administrative Rule R657-52. As of 2026, 21 companies operate on the lake. They don't catch the shrimp themselves — they catch the eggs, harvested as floating "slicks" or "streaks" between October 1 and January 31, some large enough to be visible from space. Once cleaned, dried, and graded, the cysts are sold to fish hatcheries and shrimp farms in Ecuador, Vietnam, Indonesia, China, and Israel. The Great Salt Lake supplies roughly 45 percent of the world's annual brine shrimp egg supply. In 2023, the fishery became the first inland fishery in the United States to earn Marine Stewardship Council sustainability certification. Tim Hawkes of the Great Salt Lake Brine Shrimp Cooperative has put it this way: order farmed shrimp at a restaurant anywhere in the world, and there's roughly a fifty-fifty chance it was raised on cysts from this lake.
Who Actually Buys These Things?
A reasonable question. Brine shrimp aren't human food. They aren't fishing bait either. They're baby food — for the babies of other fish and shellfish, the ones we actually eat.
Most farmed seafood begins life as a larva only a millimeter or two long, with an undeveloped gut that can't handle commercial pellet food. Hatchery operators need a live first feed that hits four marks at once: the right size, easy to digest, nutritionally complete enough to keep fragile larvae alive, and available on demand anywhere in the world, year-round. Brine shrimp cysts are the only product on earth that checks all four boxes.
The reason is the cyst itself. Brine shrimp eggs go dormant — a state of suspended biology so resilient that NASA carried cysts aboard Apollo 16 and 17 to study how radiation affects life. They can be vacuum-packed and stored dry for years. When a hatchery in Vietnam or Ecuador needs fresh food, the operator pours cysts into salt water, and within about twenty-four hours millions of newly hatched nauplii — the larval stage, roughly four-tenths of a millimeter long — are swimming and ready to be poured straight into the nursery tanks.
Roughly 2,000 metric tons of dry cysts move through the global market every year, with the Great Salt Lake as the dominant source. The cysts go primarily to Pacific white shrimp farms (the species you find in most grocery seafood cases), to marine finfish hatcheries raising sea bass, sea bream, and halibut, and to aquarium-fish breeders raising clownfish and other marine ornamentals. A small share goes to hobby aquariums, school science kits, and yes, Sea-Monkeys.
Patrick Sorgeloos, the Belgian aquaculture researcher widely considered the godfather of Artemia science, has summed up the stakes plainly: "It's thanks to artemia that we have a successful shrimp industry." Without the brine shrimp of places like the Great Salt Lake, the farmed shrimp on a Wasatch Front dinner plate likely wouldn't exist. That shrimp probably spent its first days of life eating babies from this lake.
Canary for the Lake Itself
Brine shrimp tolerate a wide salinity range — from about 3 to 33 percent. But their reproduction is more fragile. Research suggests cysts need salinity at or below roughly 18 percent to hatch reliably in spring. When the lake drops, the salt concentrates, and that hatching window narrows. The 2022–23 harvest yielded only about 19 million pounds of raw cysts, well below the 25–35 million pound annual average, after the lake hit record-low elevations and south arm salinity climbed past brine shrimp tolerance. After state agencies and Union Pacific Railroad modified the railroad causeway berm to rebalance salt flow between the north and south arms, the next harvest jumped back to roughly 29 million pounds. The brine shrimp didn't just rebound as a commodity. They rebounded as a real-time indicator that the lake's vital signs had improved. When their numbers crash, the lake is in trouble. When the harvest is healthy, the lake usually is too.
What It Means for the Wasatch Front
The lake's most visible problems — toxic dust, declining snowpack, falling water levels — get the headlines. Brine shrimp are the quieter story underneath. They are the connection between snowpack in the Wasatch and a paycheck in Ogden, between a farmer's irrigation choice in Cache Valley and a flightless grebe waiting on the Promontory Point shore in October. As BYU ecology professor Benjamin Abbott has often said of the lake's slow decline, "hydrology doesn't negotiate." The shrimp don't wait for the lake to fully dry. They go first.
That's why we're watching.
This article was written with AI assistance and edited by Cal Tebbs.
SOURCES
Utah Division of Wildlife Resources, Great Salt Lake Ecosystem Program — Brine Shrimp and Brine Shrimp Harvests pages
Utah DWR — Modifications to Great Salt Lake causeway berm benefiting brine shrimp (news release)
Utah DWR — Great Salt Lake Drought FAQ
DWR Administrative Rule R657-52 (Commercial Harvesting of Brine Shrimp)
Marine Stewardship Council — First Inland Fishery in the US Achieves Third Party Sustainability Certification
Hydrobiologia, peer-reviewed (2024) — Demographic responses of Artemia franciscana to GSL salinities, temperatures, and food
National Audubon Society — Birds of Great Salt Lake's South Arm Ecosystem Threatened
KSL/Great Salt Lake Collaborative — interview with Tim Hawkes, GSL Brine Shrimp Cooperative
Global Seafood Alliance / Responsible Seafood Advocate — profile of Patrick Sorgeloos and the global Artemia trade
FAO — Cultured Aquatic Species Information Programme: Artemia spp.
The Fish Site (April 2024) — Getting the most out of Artemia in shrimp aquaculture
Southern Regional Aquaculture Center — Artemia Production for Marine Larval Fish Culture
BYU professor Benjamin Abbott, public statements (NPR, On Point, Salt Lake Tribune, Science Friday)