- Live-Bearing Tooth Carps
- Livebearer Hybrids
- Egg-Laying Tooth Carps
- Hatchet Fish
- Carps and Minnows
- Silver Sides
- Marine Tropicals
The catfish belong to the super-order Ostariophysi, order Siluriformes, and are grouped under 31 families. The principal families covered are as follows:
- Callichthyidae - Small armoured catfish.
- Siluridae - Catfish with very long anal fins and small, or absent, dorsal fins.
- Doradidae - Heavy bodied with a single row of bony plates, every of which bear a spine, running along the centre of every side of the fish.
- Bagridae - Unarmoured catfish with long barbels. Old World.
- Pimelodidae - Unarmoured catfish with long barbels. New World.
- Bunocephalidae - Unarmoured catfish with flat heads.
- I.oricariidae - Spiny armoured catfish with sucking disc mouths.
Catfish never have scales, but some species are partly or totally covered with bony plates, and also the vast majority have barbels.
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