Science News
from research organizations

Toxic pollutants found in fish across the world's oceans

Analysis shows highly variable pollutant concentrations in fish meat

Date:
January 28, 2016
Source:
University of California - San Diego
Summary:
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 also uncovered some good news: concentrations of these pollutants have been consistently dropping over the last 30 years.
Share:
FULL STORY

Scripps researcher Lindsay Bonito holding a yellowfin tuna.
Credit: Scripps Institution of Oceanography at UC San Diego

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, reported in the Jan. 28, 2016 issue of the journal PeerJ, 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.


Story Source:

The above post is reprinted from materials provided by University of California - San Diego. Note: Content may be edited for style and length.


Journal Reference:

  1. Lindsay T. Bonito, Amro Hamdoun, Stuart A. Sandin. Evaluation of the global impacts of mitigation on persistent, bioaccumulative and toxic pollutants in marine fish. PeerJ, 2016; 4: e1573 DOI: 10.7717/peerj.1573

Cite This Page:

University of California - San Diego. "Toxic pollutants found in fish across the world's oceans: Analysis shows highly variable pollutant concentrations in fish meat." ScienceDaily. ScienceDaily, 28 January 2016. <www.sciencedaily.com/releases/2016/01/160128074322.htm>.
University of California - San Diego. (2016, January 28). Toxic pollutants found in fish across the world's oceans: Analysis shows highly variable pollutant concentrations in fish meat. ScienceDaily. Retrieved August 27, 2016 from www.sciencedaily.com/releases/2016/01/160128074322.htm
University of California - San Diego. "Toxic pollutants found in fish across the world's oceans: Analysis shows highly variable pollutant concentrations in fish meat." ScienceDaily. www.sciencedaily.com/releases/2016/01/160128074322.htm (accessed August 27, 2016).