- Columnaris, which is a white cottony growth on any part of the fishes' body.
- Hemmorrhagic Septicemia, which has the symptom of red streaks on fins or body of the fish.
- Dropsy or fish bloat, where the scales stand outward and is usually caused by a kidney disorder.
- Costiasis, which is a gray fungus on any part of the body.
- Saprolegnia, which is a true water fungus and causes fin rot.
- Pseudomonas or Aeromonas bacterial diseases, which can lead to mouth rot.