When considering underwater photography, we usually think about images of wonderful coral reefs, colourful fish, clear waters and undersea landscapes. In fact, 70 percent of our planet is covered by water on its surface, and, even though 97 percent of this is saltwater, the remaining three percent is freshwater in rivers, streams, lakes, ponds, marshes and groundwater.
We walked nearly a mile along the riverbank before finding a place where we could easily enter with our heavy equipment. The rotting carcasses of dead fish lay along the banks, and the associated stench was overpowering. It was late September 2010, and we had come to photograph an enormous migration of sockeye salmon, the largest run of sockeye in a century.
In a recent study published in the journal PLoS One, French and Scottish scientists have discovered that the 2mm long water boatman Micronecta scholtzi make the loudest sounds of any animal on earth relative to its body size. Although the sperm whale may be louder in sheer terms of decibels, when compared to size, the water boatman has all other animals beat.