Aquariums are very popular. They have been increasing in popularity for several years now, and the trend is showing no signs of slowing down.
Freshwater...
The main difference between human respiration and fish respiration is that humans breathe air through their lungs, while fish breathe water through their gills.
Humans...
Fish are often seen as the ultimate water-breathing vertebrates. They live in water all the time. However, do they drink water? Are saltwater species...