Toxic Pollutants Found in Fish Across the World's Oceans
News Jan 29, 2016
A new global analysis of seafood found that fish populations throughout the world's oceans are contaminated with industrial and agricultural pollutants, collectively known as persistent organic pollutants (POPs). The study from researchers at Scripps Institution of Oceanography at UC San Diego also uncovered some good news, concentrations of these pollutants have been consistently dropping over the last 30 years.
The findings were based on an analysis by Scripps researchers Lindsay Bonito, Amro Hamdoun, and Stuart Sandin of hundreds of peer-reviewed articles from 1969-2012. The pollutants studied included older 'legacy' chemicals, such as DDT and mercury, as well as newer industrial chemicals, such as flame retardants and coolants.
"Based on the best data collected from across the globe, we can say that POPs can be anywhere and in any species of marine fish," said Scripps biologist Sandin, a co-author of the study.
Although POPs were found in fish in all of the world's oceans, the researchers say that concentrations in the consumable meat of marine fish are highly variable, where one region or group of fish may find concentrations of POPs that vary by 1,000-fold. The analysis revealed that average concentrations of each class of POP were significantly higher in the 1980s than is found today, with a drop in concentration of 15-30 percent per decade.
"This means that the typical fish that you consume today can have approximately 50 percent of the concentration of most POPs when compared to the same fish eaten by your parents at your age," said Bonito, the lead author of the study. "But there still remains a chance of getting a fillet as contaminated as what your parents ate."
The researchers also compared the results to federal safety guidelines for seafood consumption and found that the average levels of contaminants were at or below the health standards set by the U.S. Environmental Protection Agency (EPA). Mercury and PCBs (polychlorinated biphenyl) concentrations were at the EPA threshold for occasional human consumption, while concentrations of DDT were consistently much lower than the established threshold.
According to the authors, these results suggest that the global community has responded to the calls-to-action, such as in the Stockholm Convention, to limit the release of potentially harmful chemicals into the environment.
The authors caution that although pollutant concentrations in marine fish are steadily declining, they still remain quite high, and that understanding the cumulative effects of numerous exposures to pollutants in seafood is necessary to determine the specific risk to consumers.
Sun Not Only Detrimental To SkinNews
Chemical dispersants are one of the tools that can help mitigate the impact of oil spills, but they become less effective as oil weathers in the environment. Now, one group reports that sunlight has a much greater impact than previously thought on the effectiveness of these dispersants.
Record Concentration of Microplastic in Arctic Sea IceNews
Experts have recently found higher amounts of microplastic in arctic sea ice than ever before, the majority of which were microscopically small. However, the different types of plastic showed a unique footprint in the ice allowing the researchers to trace them back to possible sources.READ MORE
Fat Cells Seem to Remember Unhealthy DietNews
Fat cells can be damaged in a short amount of time when they are exposed to the fatty acid palmitate or the hormone TNF-alpha through a fatty diet, a new study shows. The researchers hope this new knowledge may be used to develop new preventive strategies for diabetes.READ MORE
Comments | 0 ADD COMMENT
Asia Pacific Congress on Probiotics, Prebiotics and Nutrition
Oct 15 - Oct 16, 2018