Water parasites are eliminated by a variety of treatment procedures.
Here is general information on pond parasites that commonly prey on pond fish. Majority of them are only visible under microscopic magnification, however.
| Parasite | Appearance | Treatment |
| Ich (ichthyophthirius multifils) | Spinning dots within a disc | .3% salt for 2 weeks |
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| Trichodina | Disc with many short filaments | .3% salt for 2 weeks |
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| Killer Don (Chilodinella) | Oval shape moving in circles | .3% or .6% salt for 2 weeks |
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| Costia | Ciliated protozoan | .3% salt for 2 weeks |
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| Epistylis | Goblet-like | .3% salt for 2 weeks |
| | | |
| Body and Gill Flukes (Dactylogyrus and Gyrodactylus) | Worm-like, fatter at one end. Alternate, jerky elongation and contraction. | Organophosphate or Potassium Permanganate or Formalin |
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| Fish Lice(Argulus) | Round with short legs. Attached to fish. Visible to human eye | Dimilin (Diflubenzuron) or organophosphate |
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| Anchor Worm (Lernea) | Long, thin worm with tentacles attached to fish. Visible to human eye. | Dimilin (Diflubenzuron) or organophosphate |
