Millions of people around the world rely upon them for food - but fish are also pretty cool creatures. Literally.
The cold-blooded aquatic vertebrates often play a very important role in ecosystems - whether in rivers, lakes or oceans. Here's an automated compilation of content relating to fish.
Africa's biggest lake, Lake Victoria, is under threat. The lake shared by Kenya, Uganda and Tanzania is bearing the brunt of climate change. Researchers from the US teamed up with scientists from Uganda and found high levels of lead, arsenic, aluminum and phosphorous. That could spell disaster for more than 400 fish species in the lake and the 40 million people surrounding the freshwater body.
Plans to build a series of new hydroelectric plants on the Mekong have alarmed communities who depend on the river for their livelihoods. Scientists warn the dams could disrupt fish migration to breeding grounds and cause irrevocable damage to the river's complex ecosystem. DW talks to Maureen Harris of International Rivers about how locals are being impacted.