"The United States on Tuesday announced that tougher rules for labeling Mexican tuna imports as "dolphin-safe" would be expanded to the rest of the world in a bid to end a long-running trade dispute with Mexico."

"Nearly one in five acres of Maryland farmland has enough phosphorus in its soil to potentially threaten local waterways and the Chesapeake Bay, according to new state data released Monday."

"Levels of hazardous flame retardants in most Great Lakes fish are declining – or at least researchers thought they were. But a new study shows that this isn’t the case for Lake Erie smallmouth bass, an important game fish. And the contaminated fish threatens the health of some of those who eat them."

"A deadly algal bloom has hit the world's second biggest salmon exporter, Chile, where nearly 23 million fish have already died and the economic impact from lost production is seen soaring to $800 million, industry and government sources told Reuters."

"Federal officials are preparing to enforce an 86-year-old ban on importing goods made by children or slaves under new provisions of a law signed by President Barack Obama."

"Biologists discover first salmon spawning since Revolutionary War, drawing new attention to canceled restoration program".

"Researchers led by Florida State scientist counter widely quoted 2007 study linking shark declines to an explosion in rays, which then devoured oysters, clams and scallops."

"The Gulf of Mexico is now open for commercial fish farming.

The National Oceanic and Atmospheric Administration (NOAA) announced last month that, for the first time in the U.S., companies can apply to set up fish farms in federal waters.

The idea is to compete with hard-to-regulate foreign imports. But opening the Gulf to aquaculture won't be cheap, and it could pose environmental problems."

"Over the coming decades, dozens of marine species from the Carolinas to New England will be threatened by the warming, changing currents and the increased acidity expected to alter the region’s waters, according to a new study by scientists at the National Oceanic and Atmospheric Administration."

"California, Oregon and the federal government are working on a way around congressional barriers to the removal of hydroelectric dams on the Klamath River."