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CALIFORNIA FISH POPULATIONS
In 2000, San Diego sank the 366-foot HMCS Yukon off Mission Beach; from 2015 to 2020, nine divers recorded 237 observations across 58 marine speciesThe HMCS Yukon, a Canadian warship, was intentionally sunk near Mission Beach to foster a new artificial reef. Initial research from 2004 i...- In 1918–1921, one dam built on California's Carmel River provided water storage but blocked fish runs; in 2015 it came down, reopening 25 miles of habitat for steelhead troutA century-old dam on California's Carmel River was removed, restoring fish spawning grounds. Crews rerouted the river and dismantled the st...
- In 2014, East Bay Regional Park District began restoring Dotson Family Marsh, creating channels that reconnected it to the San Francisco Bay. 6 years later, tidal wetlands had returnedHistory of Dotson Family Marsh helps explain why its recovery matters. The broader 150-acre property was acquired by the East Bay Regional ...
- In 2015, California EPMT discovered Japanese knotweed along Lagunitas Creek. 2 years later, treatment cut knotweed by 93% on National Park Service land, a major gain nowJapanese knotweed can spread quietly along waterways, making an early discovery especially valuable. In 2015, California’s Early Detection ...
- A 1994 study placed tire reefs in concrete canals in California and Arizona; invertebrate densities tripled, and fish densities rose 20-fold near reefsConcrete canals, while conserving water, harmed aquatic ecosystems. Researchers tested old tires to create habitats for canal wildlife. Inv...
- In 2001, NOAA launched a restoration program after a $64 million Montrose settlement. 24 years later, a rebuilt Palos Verdes reef in California had boosted fish biomass by over 150%Two decades after a $64 million settlement funded coastal recovery, California’s Palos Verdes reef is thriving. Engineers placed 70,000 ton...
- Four dams built on the Klamath River between 1918 and 1966 made power, not water storage; in 2024, the last came down, reopening 420 miles of salmon habitatIn a groundbreaking initiative, four dams on the Klamath River spanning California and Oregon have been dismantled after a century of exist...
- In the late 1800s, California introduced red foxes for hunting and fur farms; at Seal Beach, they drove light-footed Ridgway's rails down to just 5 pairs in 7 yearsIn the late 1800s, non-native red foxes wreaked havoc on the population of Ridgway's rails, bringing them perilously close to extinction. F...
- Beginning in 1877, Japan imported California rainbow trout for food and sport fishing; escaped fish later competed with native salmonids and disrupted their spawning groundsIn 1877, Japan imported rainbow trout from California for culinary and recreational purposes. However, these fish escaped their aquaculture...
- Earlier this year, Los Angeles made 8 trips to Encino Reservoir searching for one endangered bird; they found none, but 60 wildlife species emerged before a 10-acre solar project moved aheadCity biologists made eight separate field trips to Encino Reservoir searching for one endangered songbird. They found zero Least Bell’s vir...
- After someone planted golden bamboo beside an Oʻahu road, the single ornamental planting escaped and grew into a 1-acre patch, crowding out native plantsGolden bamboo, once a beloved addition to gardens, is now recognized as an invasive menace. Its rapid growth through underground rhizomes t...
- The hidden owl war: An invasive owl is conquering ancient forests, putting the threatened northern spotted owl at even greater riskInvasive barred owls are occupying ancient forests vital for northern spotted owls. These aggressive competitors concentrate in the exact h...
- By the mid-2010s, California agencies had placed more than 200,000 tons of gravel below Keswick Dam, restoring egg-laying habitat for endangered salmonIn an initiative aimed at revitalizing the spawning grounds for the endangered winter-run Chinook salmon, California has been transporting ...
- By the mid-2010s, California agencies had placed more than 200,000 tons of gravel below Keswick Dam, restoring egg-laying habitat for endangered salmonThe construction of dams along the Sacramento River hindered the natural flow of gravel that is essential for salmon spawning. Efforts are ...
- In 2000, the American West entered a megadrought that became its driest stretch in roughly 1,200 years. Years later, it left major lakes and reservoirs majorly depleted, with some losing enough water to expose miles of lakebedSeveral major North American lakes are experiencing significant water level declines. Drought, warming temperatures, and increased water de...
- This ocean parasite kills a fish's tongue and ten takes its place; what makes the tongue-eating louse so differentA parasite enters fish through gills and replaces their tongues. This isopod, Cymothoa exigua, attaches to the tongue stump and functions a...
- From 1877, officials stocked over 33 million fish in Yosemite for anglers, altering fishless lakes and reducing habitat for native yellow-legged frogsYosemite's lakes, once fishless, received over 33 million stocked fish between 1877 and 1990. Introduced trout preyed on native species and...
- California's Tule River tribe had not had beavers on its southern Sierra Nevada lands for decades; now a family of seven is back in the South Fork Tule River watershedIn a historic move, the Tule River Tribe has embraced ancient pictographs to spearhead their beaver restoration project. Reintroducing thes...
- In 1969, California biologist Phil Pister carried endangered Owens pupfish across hazardous terrain in two buckets; in 2024, a seventh refuge population was establishedIn a dramatic rescue in 1969, biologist Phil Pister painstakingly transported the last of the Owens pupfish through challenging landscapes ...
- In 1922, California introduced mosquitofish to eat mosquito larvae; within four years, they were in 30 counties and were later linked to native-species declinesIn 1922, California introduced mosquitofish in hopes of controlling mosquito populations. Although they were initially viewed as a solution...
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