Fish

Climate Warming Driving Native Trout to Extinction, Study Says

Publication: NBC News   Date: May 25, 2014   View Article

Montana fly fishing guide and shop owner Jason Lanier hooks a feisty rainbow trout almost every day he hits the waters in the lower valley of the Flathead River system. From an angler’s perspective, the catch is a thrill. Rainbows put up a good fight, much better than the one offered by the state’s native westslope cutthroat trout.

“And cutthroats that have some rainbow genetics in them typically fight harder for sure,” the owner of the Bigfork Anglers Fly Shop told NBC News.

About 20 million rainbows were stocked in the river system that spans Montana and southern British Columbia, Canada, from the late 1800s to 1969. The fish can, and do, mate with cutthroats. This hybridization may drive the genetically pure natives to extinction, according to Clint Muhlfeld, a research ecologist with the U.S. Geological Survey in West Glacier, Mont.

What’s more, climate change is accelerating the hybridization process, according to new research led by Muhlfeld. “This is the first example we are aware of that has shown how invasive hybridization has probably spread due to climate warming,” he told NBC News.

Google Earth spies unreported fish traps, study reveals

Publication: NBC News   Date: November 26, 2013   View Article

Fishing traps known as weirs that jut from coastlines may be snaring six times more fish in the Persian Gulf than what is officially reported, according to a new estimate based, in part, on satellite imagery available through Google Earth.

Scientists turned to the Internet search giant’s mapping tool as a way to cross-check catch data reported to the United Nations Food and Agriculture Organization by six countries in the gulf, a region of the world where marine ecosystems are understudied.

Cold-water fish food not adapting to a warming world, study says

Publication: NBC News   Date: October 21, 2013   View Article

Tiny sea creatures that play a big role in the ocean food chain are unable to adapt to warming oceans, according to a new study that may have profound ramifications for fisheries.

The cold-water plankton lives for one year or less. Researchers examined a 50-year dataset from the North Atlantic to determine how this creature and another plankton that thrives in warmer water fared over half a century.

Leaky Fukushima nuclear plant raises seafood poisoning concerns

Publication: NBC News   Date: August 20, 2013   View Article

The 300 tons of radioactive water leaked to date from a storage tank at the crippled Fukushima nuclear plant in Japan is raising new concerns about the safety of seafood from the region, according to scientists.

Highly contaminated water from the newly reported leak is seeping into the ground, officials with Tokyo Electric Power Company told reporters Tuesday. They do not believe the water has reached the ocean, given the distance of the tank from the harbor. Still, it is likely only a matter of time before it does, said William Burness, an oceanographer at Florida State University, who studies environmental radioactivity.

The concern is that the radioactive water leaking from the storage tanks will eventually end up in the ocean and contaminate the marine environment, in particular fish that people eat, Burnett told NBC News.

Warming seas changing what fish are for dinner, study says

Publication: NBC News   Date: May 15, 2013   View Article

Warming oceans are pushing fish toward the poles in search of cooler waters, according to a study that raises new concerns that climate change is robbing the tropics of a primary source of income and nutrition.

Meanwhile, in higher latitudes, data show that trawlers are hauling more warm-water fish out of the ocean – a phenomenon that will change what shows up on menus at locavore restaurants from Cape Town to Tokyo.

“There’ll be changes in the kinds of fish that are available to people who would like to follow that kind of (eating local) strategy,” Michael Fogarty, a fisheries biologist with the National Oceanic and Atmospheric Administration’s Northeast Fisheries Science Center, told NBC News.

Genome of ancient-looking fish gives clues to first limbed landlubbers

Publication: NBC News   Date: April 17, 2013   View Article

The genome of the coelacanth, an ancient-looking lobed-finned fish, has been sequenced and is already providing insight to the evolutionary changes that allowed the first four-limbed animals, called tetrapods, to crawl out of the water and on to land.

The sequence and preliminary analysis, reported Thursday in the journal Nature by a team spanning 40 research institutions and 12 countries, is a “massive piece of work,” Xiaobo Xu, a paleontologist at Kean University who was not involved in the effort, told NBC News in an email.

Flushing Nemo? Pet fish pose ocean threat

Publication: NBC News   Date: January 10, 2013   View Article

Exotic and colorful aquarium fish, such as those made famous by the Disney film “Finding Nemo,” are escaping to the open ocean in real life and disrupting marine ecosystems, according to a new report on the spread of invasive species.

More than 11 million non-native aquarium fish and plants — from tropical fish to seaweed and snails, representing 102 species — are imported annually through the California ports of Los Angeles and San Francisco, the report found.

© 2008-2010 Collected Writings By John Roach