More than 10,000 people worked to clean up the worst oil spill in South Korean history after a crane punched a hole in an oil tanker, releasing 2.7 million gallons of crude. A 63-year-old shellfish farmer wept as she showed dead tar-coated oysters to a reporter …

… a study published in Science suggested that leaving more fish in the sea leads to higher profits than the traditional target known as maximum sustainable yield. “We like to say it’s a win-win,” said one of the study’s authors …

… a detailed new study of salmon farming found that farmed fish spread sea lice, which killed juvenile wild salmon

… U.S. fisheries regulators considered a program allowing 10-year permits for companies interested in offshore aquaculture. “We are already consuming a tremendous amount of farm-raised fish,” said Commerce Secretary Carlos Gutierrez. “We might as well do it ourselves under our terms, under our conditions, under our standards, and take the market”…

… a NASA climate scientist said that, based on new data, the Arctic could be ice-free in summer by 2012, much faster than previously predicted. “The Arctic is often cited as the canary in the coal mine for climate warning,” he said. “Now, as a sign of climate warming, the canary has died” …

… scientists studying swordtail fish found that entire blocks of genes in the brain turn on and off when a female is attracted to a male, with more being turned off than on …

… a red algae bloom in Florida was blamed for a number of sea turtle deaths

high levels of mercury were found in fish off the coast of northern California …

… Wyoming announced a statewide warning on consuming mercury-contaminated fish. It was the last of the 48 contiguous states to do so …

… and a surfer in New Zealand encountered two sharks in one day. She was unhurt.