Diseases of Fish in Small Ponds & Lakes

Written by daniel ames
  • Share
  • Tweet
  • Share
  • Pin
  • Email
Diseases of Fish in Small Ponds & Lakes
Fish in lakes and ponds can suffer from several types of disease. (bass image by Witold Krasowski from Fotolia.com)

Fish found in lakes and ponds can suffer from a variety of diseases. Because fish from these smaller bodies of water are often caught by recreation anglers and eaten, it is a good idea for fishermen to know what kinds of problems are associated with these fish. It's always a good idea to study the fish you catch before considering cooking them for consumption. Also, the health of the fish is an indicator of the quality of water in the lake or pond where you find them.

Other People Are Reading

Bacterial Disease

One of the most common diseases found in fish from lakes and small ponds is bacterial disease. Bacterial disease occurs when the natural balance of chemicals in a given body of water are out of balance, which is usually caused by things like pollution, overfishing or pesticides. Fish suffering from bacterial diseases usually feature abnormal spots or lesions on their bodies or red, puss-filled eyes.


Fungus disease is less common than bacterial disease. Fungus diseases can spread rapidly throughout a fish population and are typically caused by pollution. Signs of fungus infections among fish in lakes and ponds are typically a bloated, twisted appearance to the fish. Fungus diseases can also appear on a fish's body as pale patches and the appearance of ragged, shredding flesh.

Parasitic Disease

Another common disease found among fish in lakes and ponds is caused by parasites. A parasitic infection can also spread rapidly through a fish population and is caused typically by pollution and/or an introduction of a non-native parasite. Signs of illness depend on the type of parasite, but typically black spots on a fish's body or the appearance of foreign bodies on the fish itself are common.

Gill disease

Gill disease gets its name from the fact that fish inflicted with this illness move their gills rapidly, but not from swimming or exerting more vigorously. Fish suffering from gill disease also appear listless and confused. Gill disease is caused by a large and vigorous infestation of bacteria and fungus.


Argulus, more commonly referred to as "fish lice," are known to infest fish in a variety of locations and different types of bodies of water. Argulus appear as black spots on the body of a fish, but upon closer inspection, the parasites are visible to the naked eye. If fish are thoroughly infected with Argulus, they typically die within one week.

Don't Miss

  • All types
  • Articles
  • Slideshows
  • Videos
  • Most relevant
  • Most popular
  • Most recent

No articles available

No slideshows available

No videos available

By using the eHow.co.uk site, you consent to the use of cookies. For more information, please see our Cookie policy.