| Rank | Board name and description | Posts | Members |
| 1 | Reef Central Fish and Aquarium message boards | 12452231 | 190454 |
| 2 | Saltwaterfish Tropical fish forums | 2509026 | 44776 |
| 3 | Piranha Fury Piranha discussion forums | 2039679 | 27848 |
| 4 | Fish Forums Tropical Fish message boards | 1993976 | 34529 |
| 5 | Dr Pez Fish and aquarium forums (in Spanish) | 1915260 | 40676 |
| 6 | Fish Profiles Fish and aquarium discussion forum | 908646 | 14778 |
| 7 | Aquarium Advice Aquarium and fish forums | 843828 | 15606 |
| 8 | Cichlid Forum Message board dedicated to cichlid fish | 712432 | 44822 |
| 9 | Oscar Fish ifshkeeping forum specialized in Oscars | 691168 | 10517 |