The tiny eggs behind the Great Salt Lake's brine shrimp harvest

The Great Salt Lake's 2026-27 brine shrimp harvest opened at noon on Oct. 1. On the state's harvest page, checked Oct. 17, the latest sampling run, on Oct. 5, found 100.46 cysts per liter of lake water, and the latest harvest entry, dated Oct. 7, showed 1,283,159 pounds taken from the lake. ^[1]

Those numbers measure different things. The first is how many cysts are in the water; the second is how much raw material companies have removed. Neither is a measure of the lake's overall health. ^[1]

A harvest of resting eggs

Brine shrimp cysts are embryos sealed in a protective shell that can wait out harsh conditions. The harvest supplies the aquaculture industry. Commercial harvesting on the lake began in 1950, and the Division of Wildlife Resources says 21 companies harvest in the north and south arms as of 2026. ^[1]

The shrimp are also bird food. The division says eared grebes feed almost exclusively on brine shrimp while preparing to migrate, and Wilson's phalaropes can double their weight on them. ^[2]

A 2019 study by Gary Belovsky and W. Clay Perschon traces how the division built its management after the fishery expanded in the late 1980s, using monitoring and harvest models, and stopping the harvest once a needed reserve of cysts, called the escapement, is left in the lake. ^[3]

How a season ends

The division's current estimated minimum is 21 cysts per liter at the end of each harvest season. That is an end-of-season target, not a reading to compare with this month's 100.46. ^[1]

Last season shows how it works. In January 2026, the division extended the 2025-26 season to as late as Feb. 28, or until its staff decided cyst numbers had fallen enough to close it. Its notice said the population could crash if spring cyst numbers dropped below 4 per liter or approached 80, that numbers were then near 100, and that more harvest was needed to reach about 21. ^[4]

The season did not run to Feb. 28. A Feb. 2 sample of the south arm found 21.35 cysts per liter, and the division closed lake and shore harvesting in both arms at sunset on Feb. 6. Harvesting could continue in salt ponds. ^[5]

Through Feb. 4, companies had reported 40,628,672 pounds: 30,301,738 from the lake and 10,326,934 from the shore. ^[5]

Raw pounds, not product

State rule R657-52 requires companies to report daily and weekly harvests by raw weight. Lake-harvested loads are weighed on certified scales; shore-harvested loads are estimated. Raw pounds are not the same as finished cysts sold, so the harvest totals can't be turned into revenue. ^[6]

The division's harvest page puts the industry's value at $10 million to $60 million, depending on the quality and quantity of cysts. The rule says a harvesting certificate guarantees no minimum harvest and no particular season length. ^[1][6]

Why a count is not the whole story

A 17-year experiment on the lake, published in Limnology and Oceanography in 2019, found that the share of cysts able to hatch going into winter ranged from 17.8% to 78.8% by year, and overwinter survival from 9.9% to 65.9%. Some cysts hatched when the water was too cold for the young to feed, and they starved. Survival fell most in warmer winters. ^[7]

A laboratory study by Belovsky and colleagues, published online in Hydrobiologia in September 2024, tested salinity, temperature and food together. Food mattered most for survival and development, and the authors concluded that studies looking at one factor alone are of limited value. With more food, the shrimp shifted from producing cysts toward bearing live young. ^[8]

The U.S. Geological Survey released a dataset on the lake's nutrients in January 2026. Most of its samples, from the water, lake bottom, brine shrimp, rivers and air, were collected from June through October 2020. It describes conditions then, not now. ^[9]

Water for the lake

The Legislature's 2026 budget includes $2.8 million a year from the General Fund, under H.B. 410, to create the Great Salt Lake Preservation Program, which leases agricultural water for the lake. ^[10]