Fish are available for purchase in the Supply Store using Coins or Fishbucks. There are several categories of Fish in Fish World:
- Starter Fish (8)
- Rock 'n' Roll (8)
- Exotic Fish (59)
- Marine Life (18)
- Mini Fish (5)
- Dino Fish (1)
- Security Creatures (6)
- Beach (13)
- Algae Eaters (5)
- Spring (2)
- Pirate Fish (12)
- Birthday Fish (21)
- Roman Fish (10)
- Halloween Fish (7)
- Holiday Fish (17)
- Valentines Day (14)
- St. Patricks Day (7)