General Topics:
- Fish Disease
Aquarium Freshwater Fish Species:
Catfish:
- Armored catfish (including Aspidoras, Brochis, Callichthys, and Corydoras)
- Armored suckermouth catfish (plecos, oto, and whiptail)
- Long-whiskered catfish
- Squeakers and upside-down catfish
- Other catfish
Characins and other characiformes:
- Tetras
Hatchetfish
Pencil fishes
Serrasalminae (pacus, piranhas, and silver dollars)
Other Characins
Cichlids:
- Lake Tanganyika cichlids
- Lake Victoria cichlids
- Miscellaneous African cichlids (non-Rift Lake)
- Dwarf cichlids (apistogrammas, rams and others)
- Central American cichlids
- South American cichlids
- Other cichlids
Cyprinids:
- Barbs
- Other Cyprinids
Rasboras
Danios and other Danionins
Loaches
Live-bearers and killifish:
- Guppies and mollies
- Platies and swordtails
- Other Livebearers, like Gambusia
- Killifish
Anabantids or Labyrinth fish:
- Gourami
- Other Labyrinth Fish
Rainbowfish
Gobies and sleepers
Sunfish and relatives
Other fish