Searched for
FISH POPULATIONS
In 2009, Illinois treated a six-mile canal with more than 1,800 gallons of fish-killing poison — and found just one invasive carp- In 2001, USDA researchers released salvinia weevils in Texas and Louisiana; by 2003, weed cover had fallen near release sites while untreated controls stayed choked
- A 1994 study placed tire reefs in concrete canals in California and Arizona; invertebrate densities tripled, and fish densities rose 20-fold near reefs
- 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...29 Aug, 2026, 06.59 PM IST
- 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...29 Aug, 2026, 01.06 AM IST
- In 1998, New York listed Keuka Lake as impaired after DDT contamination. 16 years later, fish-tissue data led officials to remove the lake from the impaired waters listKeuka Lake DDT cleanup shows how a pesticide banned decades ago kept affecting fish through contaminated soil and runoff. The problem began...28 Aug, 2026, 09.01 PM IST
- 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...28 Aug, 2026, 07.16 PM IST
- In 2018, New York's Cortland County funded 3 culvert and stream projects. 5 years later, all 3 sites improved from severe barriers to insignificant barriers for better fish passageCortland County projects fit into a broader New York effort to identify and address barriers to aquatic organism passage. New York's Depart...27 Aug, 2026, 06.15 PM IST
- During Alaska stream research, teams developed an automated salmon-counting system to track fish in sonar video and reduce reliance on manual countingAlaska's manual salmon counting techniques are laborious and expensive. To improve efficiency, new computer vision algorithms are under dev...27 Aug, 2026, 02.40 PM IST
- 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, ...26 Aug, 2026, 08.59 PM IST
- 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...26 Aug, 2026, 06.30 PM IST
- 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...26 Aug, 2026, 03.30 PM IST
- 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...26 Aug, 2026, 03.10 PM IST
- 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 ...26 Aug, 2026, 01.50 PM IST
- 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...26 Aug, 2026, 01.40 PM IST
- 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...24 Aug, 2026, 07.12 PM IST
- 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...21 Aug, 2026, 10.52 PM IST
- 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...21 Aug, 2026, 06.59 PM IST
- 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...21 Aug, 2026, 05.22 PM IST
- 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...20 Aug, 2026, 04.35 PM IST
Load More
