News tagged with wild fish
Hatchery fish mask the decline of wild salmon populations
Scientists have found that only about ten percent of the fall-run Chinook salmon spawning in California's Mokelumne River are naturally produced wild salmon. A massive influx of hatchery-raised fish that return to spawn in ...
Feb 08, 2012 |
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Rare, once-royal turtle to be tracked in Cambodia
(AP) -- One of the world's most endangered turtles has been released into a Cambodian river with a satellite transmitter attached to its shell to track how it will navigate through commercial fishing grounds ...
Jan 21, 2012 |
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Explosives and fish are traced with chemical tags
Researchers at the University of Oviedo (Spain) have come up with a way of tagging gunpowder which allows its illegal use to be detected even after it has been detonated. Based on the addition of isotopes, ...
Jan 12, 2012 |
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Evolution at warp speed: Hatcheries change salmon genetics after a single generation
The impact of hatcheries on salmon is so profound that in just one generation traits are selected that allow fish to survive and prosper in the hatchery environment, at the cost of their ability to thrive ...
Dec 19, 2011 |
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Lice from farmed salmon imperil wild salmon, new study confirms
(PhysOrg.com) -- A new study on the impacts of lice on wild salmon published today by an independent team of academic researchers in the Proceedings of the National Academy of Sciences (PNAS) confirmed what many previous ...
Aug 22, 2011 |
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Social behavior can make predators even pickier
Your greedy cat may turn up his nose at different food, but wild animals can be conservative when it comes to food choices too. And new research suggests that, in a group, even adventurous individuals can ...
Aug 18, 2011 |
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Texas drought will harm wildlife habitat for years
(AP) -- In a muddy pile of sand where a pond once flowed in the Texas Panhandle, dead fish, their flesh already decayed and feasted on by maggots, lie with their mouths open. Nearby, deer munch on the equivalent ...
Aug 08, 2011 |
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Predatory fish have large guts to help them through famine
(PhysOrg.com) -- A new study by scientists in the US has solved the mystery of why predatory fish have a far greater digestive capacity than they actually need. The study suggests the reason is that the extra-large ...
Jul 08, 2011 |
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Conservation of genetic structure in lake salmonids affected by hydropower regulation, release of fish and hybrids
The negative effects of releasing fish and the possible fragmentation of natural fish stocks in connection with hydropower regulations may be fewer than at first feared.
Jun 28, 2011 |
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Judge won't guard fish farm from Grand Coulee flow
(AP) -- A federal judge on Friday refused to order a cut in flows from the Grand Coulee Dam that threaten millions of fish raised in pens downstream in the Columbia River.
May 28, 2011 |
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Ark. fish deaths still a mystery after tests
(AP) -- The mystery of what killed tens of thousands of fish that washed up along the Arkansas River late last year can't be solved, state wildlife officials announced Wednesday, but they do have a theory about what caused ...
Jan 27, 2011 |
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Wild salmon decline was not caused by sea lice from farm salmon: study
A new UC Davis study contradicts earlier reports that salmon farms were responsible for the 2002 population crash of wild pink salmon in the Broughton Archipelago of western Canada.
Dec 13, 2010 |
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Scientists worry North Pacific salmon may run out of food
With the number of salmon in the North Pacific having doubled in the past 50 years, scientists are increasingly concerned there may not be enough food to support them, and changing ocean conditions could make it even worse.
Nov 28, 2010 |
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Averting the perfect storm for wild salmon
We hear so much about missing wild salmon and recently a record run. But Simon Fraser University scientists say a population explosion of hatchery and wild salmon in the North Pacific Ocean is leading hatchery fish to beat ...
Oct 04, 2010 |
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A new chemical method for distinguishing between farmed and wild salmon
Wild salmon and farmed salmon can now be distinguished from each other by a technique that examines the chemistry of their scales.
Sep 30, 2009 |
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