Underwater nuclear bomb detectors have picked up an increasing flurry of song from pygmy blue whales in the Indian Ocean, indicating numbers of the elusive species have rebounded after it was hunted to near-extinction.
The whale shark is the largest fish in the world, growing up to 20m in length. Despite their great size, this species is endangered, with industrialised shipping now found to have lead to a large number of collisions and potential whale shark deaths across the world.
Almost all bodies of water have some algae, but in a red tide, the water changes colour because the population of algae living in the water becomes so dense. Off the west coast of Florida, these red tides are also likely to cause dead zones of life by starving the water of oxygen.
New research has shown that there has been a striking decrease in basking shark sightings in the California Current Ecosystem. In the mid-1900s, basking sharks were observed by the thousands each year off California’s coast. Now they are rarely seen at all in this region.