Using advanced diving technology to survey coral reefs at depths up to 300 feet, scientists could observe rarely seen ecosystems, during the expedition that took place aboard NOAA Ship Hi'ialakai within Papahanaumokuakea Marine National Monument in the northwestern Hawaiian Islands.

The fish surveys at these depths revealed an extremely high abundance of species found only in the Hawaiian Islands. At some of the deep reefs surveyed, 100 percent of the fishes recorded were endemic.

The shipwreck was first discovered in 2013. It was first code-named "Dandong No.1" and has been tentatively identified as the Cruiser Zhiyuan.

On 17 September 1894, during Battle of the Yalu River - the largest naval engagement of the First Sino-Japanese War, involving ships from the Imperial Japanese Navy and the Chinese Beiyang Fleet - the Zhiyuan came under attack from Japanese cruisers. It was hit in the bow by a Japanese shell after which the Chinese cruiser rapidly sank with the loss of 245 officers and crewmen out of a complement of 252 complement.

Feeding performance of blue whales vary wide as a function of prey density and distribution, according to new research just published in Science Advances. Because rorqual whales are air-breathing divers that exhibit a high-cost feeding mechanism, they are under considerable pressure to optimize their foraging success by weighing oxygen use against possible energy gain. Blue whales, the researchers have found, follow a complex strategy of switching from conserving oxygen when prey quality is low, to intense foraging at the expense of oxygen when prey quality is high.