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.
Sea lice are threatening the Canadian salmon industry. Farmers are desparately looking for ways to fight the parasites. They treat them aggressively with peroxide solution, or more gently by adding "cleaner fish" to their tanks. Meanwhile, consumers have to stomach higher salmon prices until the market recovers.