![For years, scientists have tracked the movements of salmon through rivers in the Pacific Northwest and around the world. Now a smaller, more powerful battery will allow them to track even younger, smaller fish over longer distances. Slightly larger than grains of rice, the new batteries power a transmitter small enough to inject into these fish -- rather than surgically implant them. The result is less stressful for the fish and less costly for the researcher. <a href="http://www.pnnl.gov/news/release.aspx?id=1040" target="_blank">Learn more about the batteries here</a>. | Photo courtesy of PNNL. For years, scientists have tracked the movements of salmon through rivers in the Pacific Northwest and around the world. Now a smaller, more powerful battery will allow them to track even younger, smaller fish over longer distances. Slightly larger than grains of rice, the new batteries power a transmitter small enough to inject into these fish -- rather than surgically implant them. The result is less stressful for the fish and less costly for the researcher. <a href="http://www.pnnl.gov/news/release.aspx?id=1040" target="_blank">Learn more about the batteries here</a>. | Photo courtesy of PNNL.](https://webarchive.library.unt.edu/web/20161228215920im_/https://www.energy.gov/sites/prod/files/styles/borealis_article_hero_respondsmall/public/042514.jpg?itok=eY6hUkde)
For years, scientists have tracked the movements of salmon through rivers in the Pacific Northwest and around the world. Now a smaller, more powerful battery will allow them to track even younger, smaller fish over longer distances. Slightly larger than grains of rice, the new batteries power a transmitter small enough to inject into these fish -- rather than surgically implant them. The result is less stressful for the fish and less costly for the researcher. Learn more about the batteries here. | Photo courtesy of PNNL.
Every week, we'll feature our favorite energy-related photo here on Energy.gov, at Facebook.com/Energygov and on Twitter via @ENERGY. For other photos of the week, view our gallery. If you have ideas for Photo of the Week, send us an email at NewMedia@hq.doe.gov.