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FISH REPRODUCTION
In 2001, scientists began adding tiny amounts of synthetic estrogen to an Ontario lake; within the next two years, its fathead minnow population collapsedA seven-year whole-lake experiment in northwestern Ontario examined how chronic exposure to the synthetic estrogen 17α-ethynylestradiol (EE...- Texas will pay you $100 for catching this invasive fish as officials warn anglers to ‘Keep, Cool, Call’Texas is offering anglers $100 for every invasive black carp caught and reported as part of a multi-state research effort. Anyone who belie...
- In 1994, NASA flew four Japanese red-bellied newts on STS-65 for nearly 15 days; two adults died, but 32 newt eggs hatchedSpace Shuttle Columbia's 1994 mission studied animal reproduction in zero gravity. Four red-bellied newts and medaka fish were part of biol...
- In 2011, Colorado linked 90% of Lower Gunnison River selenium pollution to farming. 11 years later, farm work cut selenium by 50%, helping the river meet standards todayFor years, selenium from irrigated farmland posed a challenge for Colorado’s Lower Gunnison River. Irrigation can mobilize naturally occurr...
- A synthetic hormone was added to a remote Canadian lake in tiny amounts — then an entire fish population nearly collapsedA synthetic estrogen introduced into a Canadian lake caused a significant ecological shock. This chemical, present in tiny amounts, severel...
- In 2019, this California sea creature was heading toward extinction; scientists raised babies in captivity and returned them to the oceanWhite abalone faced extinction due to overfishing and sparse populations. Scientists initiated a captive-breeding program, producing millio...
- Lake 223 acid rain experiment: Scientists added sulfuric acid to an Ontario lake for 17 years. The water recovered, but the fish didn’tA 17-year acid rain experiment at Canada’s Lake 223 changed its water chemistry and disrupted its ecosystem. Although the lake’s acidity ha...
- In 2014, Arizona used fish poison to clear an invasive fish from Virgin River after mechanical removal methods failed. Then the red shiner came backFor years, conservationists waged a relentless battle against the invasive red shiner in the Virgin River. Initial rotenone treatments show...
- Why just one scrap of microplastic can cause high cholesterol and kidney damage in young seabirdsTiny microplastics infiltrate even the most isolated ecosystems around the globe, posing serious threats to wildlife health. These minuscul...
- Can fish populate space? In 1994, four medaka fish were flown aboard Columbia. They laid 43 eggs; 8 babies were born in space with no gravity. Adult fish, however, forgot to use one organ in their bodyIn 1994, Japanese astronaut Chiaki Mukai was pleasantly shocked to find that new life could indeed be born in space. Four fish he had carri...
- In 2012, Alaska counted 58 pigeon guillemots on Naked Island as mink threatened nests. 11 years later following restoration, their numbers had jumped nearly 400%, reaching 288 birds in 2023Pigeon guillemot numbers on Alaska's Naked Island Group have significantly increased. This recovery followed a multiyear effort to remove i...
- 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...
- 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 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 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 2024, managers deliberately cooled the Colorado River to protect the Grand Canyon from invasive smallmouth bass. 2 years later, no bass recruitment had been detected, but the effort cost $19.1 million in replacement powerManagers at Glen Canyon Dam used an unusual strategy to protect native Colorado River fish from invasive smallmouth bass: they deliberately...
- In 1963, federal engineers completed Glen Canyon Dam in Arizona for water storage and power, which turned the Colorado River colder and disrupted native fish reproductionGlen Canyon Dam altered the Colorado River's temperature and flow significantly. This change negatively affected the endangered humpback ch...
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