Posted on February 4, 2016 by Bob Berwyn
Rapidly warming ocean temperatures off the New England coast are affecting many marine species. Graphic courtesy NASA.
New vulnerability assessment to help guide fisheries management
Rapidly warming ocean temperatures off the coast of the Northeastern U.S. are likely to have a big impact on nearly all fish and other marine life in the region. Scientists with the National Oceanic and Atmospheric Administration carefully surveyed 82 species in a recent study, trying to identify which are the most vulnerable to global warming.
“Our method identifies specific attributes that influence marine fish and invertebrate resilience to the effects of a warming ocean and characterizes risks posed to individual species,” said Jon Hare, a fisheries oceanographer at NOAA Fisheries’ Northeast Fisheries Science Center (NEFSC) and lead author of the study. “This work will help us better account for the effects of warming waters on our fishery species in stock assessments and when developing fishery management measures.” Continue reading
Filed under: biodiversity, climate and weather, climate change, global warming, Marine biology, ocean acidification, ocean conservation | Tagged: climate change, fisheries, global warming, New England, NOAA, oceans | Leave a comment »
Posted on January 18, 2016 by Bob Berwyn
Not smiling …
Modeling projects huge economic losses in fisheries
A fine-grained look at climate change impacts in Canada suggests that coastal First Nations people might be hit especially hard, with fisheries catch potentially declining by 50 percent in the next few decades. That represents losses between $6.7 and $12 million annually by 2050.
According to the study conducted by former University of British Columbia grad student Lauren Weatherdon, the projected changes threaten the food and economic security of indigenous communities along coastal British Columbia, Canada. Continue reading
Filed under: climate and weather, climate change, global warming, ocean acidification | Tagged: Canada, climate change, First Nations, fisheries, global warming, indigenous people | Leave a comment »
Posted on October 31, 2015 by Bob Berwyn
Can cod survive in the Gulf of Maine?
Management not keeping up with changing conditions
The Gulf of Maine is simply getting too warm for cod, fisheries experts said in a new study released this week that links the warming to changes in the position of the Gulf Stream and to climate oscillations in the Atlantic and the Pacific. These factors add to the steady pace of warming caused by global climate change.
Cod stocks, once the mainstay of New England’s fisheries, are on the brink of collapse, hovering at 3 to 4 percent of sustainable levels. Even strict quota limits on fishermen failed to help cod rebound, and that’s unlikely to change any time soon, the researchers reported in the journal Science. Continue reading
Filed under: biodiversity, climate and weather, Environment, global warming | Tagged: climate change, cod, fisheries, New England | Leave a comment »
Posted on June 9, 2015 by Bob Berwyn
Estuaries are important nurseries for marine species, and they are also susceptible to pollution from land-based sources.
‘We are finding hypoxic areas wherever we look’
FRISCO — Nutrient pollution from farming has seeped into nearly every corner of a California estuary, affecting the abundance of fish in the important marine nursery, according to new research by scientists with the University of California at Santa Cruz and The Nature Conservancy.
Lead author Brent Hughes began studying water quality in Elkhorn Slough as a UCSC graduate student. His earlier research showed that virtually every portion of the estuary is adversely affected by high nutrient levels. The pollution stimulates the growth of algae, leading to low oxygen levels when the algae die and decompose.
The new study, based on data collected over the past 40 years, shows how low levels of dissolved oxygen (a condition known as “hypoxia”) affects fish populations in the estuary and beyond. Continue reading
Filed under: Environment, water, water quality | Tagged: Elkhorn Slough, Environment, fisheries, Monterey Bay, nutrient pollution, water quality | 1 Comment »
Posted on January 29, 2015 by Bob Berwyn
Open water in the Arctic will shake up the species mix in both the Atlantic and Pacific oceans.
Changes ahead, outcome uncertain
FRISCO — Melting Arctic sea ice is breaking down the natural barrier between Pacific and Atlantic fish species, with as-yet unknown consequences for ocean ecosystems, scientists said this week in a new study published in Nature Climate Change.
The last time the environmental conditions allowed such large-scale transfer to occur was nearly three million years ago during the opening of the Bering Strait, which facilitated the spread of mostly Pacific marine species toward the Atlantic. Continue reading
Filed under: Arctic, climate and weather, climate change, global warming, Greenland | Tagged: Arctic sea ice, climate change, fisheries, global warming, invasive species | Leave a comment »
Posted on July 27, 2014 by Bob Berwyn
Even the imminent decimation of tuna populations hasn’t stopped sport fishermen from harvesting the desirable fish in the Gulf of Mexico and elsewhere. bberwyn photo.
Not enough adults left to replenish populations
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FRISCO — Pacific bluefin tuna won’t last long at any sustainable level without immediate and drastic intervention by fisheries managers, according to ocean advocates who are urging the federal government to adopt strict limits on bluefin tuna catch.
Overall, many tuna populations are on the brink of collapse. Five of eight tuna species have been assigned threatened or near-threatened status on the international Red List maintained by the International Union for the Conservation of Nature.
In the Gulf of Mexico, for example, the Deepwater Horizon oil disaster spewed millions of gallons of oil into the species’ prime breeding grounds, and a 2010 report by the International Consortium of Investigative Journalists showed how illegal fishing and inadequate enforcement are decimating tuna stocks all over the world. Continue reading
Filed under: biodiversity, Environment, Marine biology, ocean conservation | Tagged: biodiversity, Bluefin tuna, Environment, fisheries, oceans | Leave a comment »
Posted on January 15, 2014 by Bob Berwyn
Colorado gets new Gold Medal trout fishery.
Restoration efforts yield big gains in Colorado
By Summit Voice
FRISCO — Restoration efforts along the Arkansas River have paid sweet dividends for trouts and anglers, as state officials last week designated a 102-mile stretch of the river as a Gold Medal fishery.
The designation has been 20 years in the making, and although anglers have enjoyed the improved conditions for years, it is an official acknowledgement of the myriad efforts undertaken by state and federal agencies to turn an impaired river into one of the most popular fishing destinations in Colorado.
With the addition of the Arkansas River, total Gold Medal stream miles in Colorado increases by 50 percent to 322 total miles. It will also be the longest reach of Gold Medal water in the State. Continue reading
Filed under: Colorado, Colorado Division of Wildlife, Colorado State Parks | Tagged: Arkansas River, Colorado, fisheries, Gold medal streams | Leave a comment »