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FISH POPULATION
In 1992, Congress authorized the removal of 2 dams that had blocked salmon for a century. 24 years later, the Elwha River once again flowed freely from the Olympic Mountains to the seaElwha River Restoration changed one of America’s most remarkable river recovery stories. Two dams once blocked salmon from reaching upstrea...- In a 1982 US reservoir review, fish and plankton productivity rose after valleys were flooded, then declined as spawning habitat and detritus became less availableFollowing the creation of American reservoirs, there’s an initial surge in fish populations, creating a thriving aquatic ecosystem. However...
- 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 1920s, Arizona’s State Game Department introduced bullfrogs for food and sport; the predators now eat young northern Mexican gartersnakes and move up to 7 milesArizona introduced American bullfrogs a century ago for sport, which now threatens native gartersnakes. These nonnative frogs disrupt food ...
- 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...
- In 2019, Australia lowered a 58-ton concrete greenhouse into the Great Barrier Reef; the 12-metre underwater structure became a living artwork and coral habitatNestled beneath the waves near John Brewer Reef in Australia lies an innovative Coral Greenhouse sculpture crafted from pH-neutral cement, ...
- In 2025, Mowi launched Chile’s first floating-solar salmon farm. 1 year later, solar and batteries cover 57% of its power needs and are expected to cut diesel use by 36,750 gallons a yearA salmon farm in southern Chile now uses floating solar panels and batteries. This system supplies approximately fifty-seven percent of the...
- 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...
- In 1970s, silver carp were brought to the US for aquaculture. Now the jumping fish threaten a $20 billion Great Lakes industryInvasive silver carp are rapidly approaching the Great Lakes, raising alarm over potential ecological and economic damage. The recent detec...
- In 2002, a Maryland angler caught a huge fish he had never seen before. The discovery sparked panic, inspired horror movies and the species became one of America's most notorious invasive fishA strange fish caught in a Maryland pond in 2002 soon became the center of a nationwide invasive species scare. The discovery of the northe...
- Machhli ado about the return of HilsaThe return of Hilsa fish to the upper Ganga after decades marks a significant triumph in conservation. Government labs are successfully imp...
- In 2014, Maine began developing a fish elevator to carry American shad past Milford Dam. 12 years later, the system could reopen 600 miles of river habitat to a fish whose migration has been blocked for decadesA Maine fish elevator could reopen 600 miles of river habitat for alewives, giving a small fish a much bigger chance to return upstream. Th...
- In 1990, Utah officials killed more than 99% of the fish in a 17,000-acre reservoir; years later, it became a top trout fisheryIn 1990, Utah wildlife officials took the bold step of using rotenone to eradicate over ninety-nine percent of the fish biomass in the rese...
- In 1995, a Tasmanian fisherman found a dead carp. What followed was a four-decade operation to remove nearly 50,000 European fishA dead carp spotted in Tasmania's Lake Crescent in 1995 triggered a 28-year campaign to eradicate invasive European carp from Lake Crescent...
- In 1985, the first invasive lionfish spotted off Florida after aquarium release; in three decades, they spread from Gulf of Mexico to the southern CaribbeanThe invasive lionfish, first introduced in the 1980s, has quickly proliferated across the Western Atlantic, extending its reach from Florid...
- In 2012, PacifiCorp launched a trap-and-haul program to move adult salmon upstream past Merwin Dam. 14 years later, researchers found 2 stages in the system but 1 decisive bottleneck: young salmon failing to find the artificial current downstreamA trap-and-haul program on Washington’s Lewis River helps adult Chinook salmon bypass Merwin Dam by transporting them in trucks to upstream...
- In 1960, Japan’s future emperor took 18 bluegills home from Chicago. Their descendants multiplied into millions and invaded Lake BiwaA significant ecological problem arose from a 1960 gift of bluegills to Japan's Crown Prince Akihito. These fish propagated swiftly, infilt...
- In 1905, Hawaii introduced mosquitofish to fight mosquitoes. More than 100 years later, the fish is threatening native wildlifeAn invasive species, mosquitofish, introduced to Hawaii in 1905 poses a significant threat to the islands' native freshwater ecosystem. The...
- How a mosquitofish brought in to kill mosquito larvae became major freshwater ecosystem problemA fish introduced to Hawaii over a century ago now threatens native freshwater wildlife. The mosquitofish, brought to control mosquitoes, n...
- In 2014, Nevada agencies began poisoning 44 miles of waterway after hand-removal failed; they later released about 400 native troutThe recovery of a native trout population in a Nevada river spans fifteen arduous years, marked by extensive measures. After exploratory dr...
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