By Richard Pallardy
“There are nearly 33,000 species of fish in the world. Almost half of that number live in freshwater—an astounding level of diversity given that only around .01% of the liquid water on the Earth’s surface is fresh. Since the mid-19th century, the popularity of keeping them—and their saltwater cousins—in home aquariums has grown exponentially, with new and innovative techniques allowing for the husbandry of ever-more rare and particular specimens. “
Read more at Earth.com
Chicago Science Writers 