From Comet to Fantail, here is a one-stop guide to the five most popular varieties of Goldfish admired worldwide.

We began keeping goldfish as pets more than 1,000 years ago, but their beauty wasn’t the only thing they had going for them.

Goldfish are hardy, fairly simple to care for, and eye-catching, so it’s no wonder they’re popular pets. These passive freshwater fish are ideal for renters who can’t have other types of pets, ...