Why would a fantail fish have no tail like it has been eaten?
http://freshaquarium.about.com/cs/disease/p/finrot.htm
Disease Type: Bacterial (gram negative organism) Organism: Aeromonas, Psuedomonas, or Vibrio
Description: Fin rot is one of the most common, and most preventable, diseases in aquarium fish. It is caused by several types of bacteria, and often occurs concurrently with other diseases. It can usually be cured, but if left untreated, it can kill the diseased fish and infect all the others in the tank.
Symptoms: Fin edges turn white
Fins fray
Bases of fins enflamed
Entire fin may rot away
The fins begin to fray and get ragged, becoming shorter over time. Usually the edges look white, and may even develop a fuzzy growth due to secondary Cotton Wool infection. A the disease advances the area may become red an inflamed, with bloody patches appearing as more of the fin is eaten away.
Treatment : Correct root cause
Water change
Treat with antibiotics
Addition of aquarium salt
Fin rot is caused by one of several gram negative bacteria. Several anitiboitics are effective, however the root cause must be addressed as well.
Fin rot occurs when the fish is stressed for some reason. The most common cause is poor water quality. Overcrowding the tank, feeding outdated food or overfeeding, and moving or handling the fish can also cause stress leading to fin rot.
Treatment should include a water change, and careful examination of the aquarium conditions. If there is food debris, vaccumm the gravel and take care to avoid overfeeding. Start dating your fish food, as it loses the vitamin content fairly quickly after it is opened. Feeding fish fresh, high quality food, in smaller quantities is far better than frequent large feedings of stale foods.
Check the pH and water temperature of the water, and make sure it is appropriate for your fish. Incorrect pH is very stressful for fish, and can lead to disease. Low water temperatures, particularly in fish with long flowing fins, can trigger fin rot.
If the root cause is corrected, antibiotics will usually cure the disease itself. Use a drug that is effective against gram negative organisms. Chloramphenical, Oxytetracycline, and Tetracycline, are good choices. Treat according to manufacturers instructions.
The use of aquarium salt will benefit livebearing fish, but should be avoided in fish, such as scaleless catfish, that are sensitive to salt
Prevention: Maintain good water quality
Keep proper water parameters
Feed fresh food in small amounts
The best prevention is good aquarium maintenance. Change the water regularly, vaccum the gravel, and monitor the water chemistry. Do not overcrowd the tank, and watch for signs of fighting between fish.
When feeding, keep the volume low! Overfeeding is the most common mistake made by all fish owners, and contributes to poor water quality. Be sure to use fresh foods. If the can has been open for half a year, it has lost most of its nutritional value. Purchase food in small enough containers that it can be used in one to two months. Other Diseases Columnaris
Neon Tetra Disease
Velvet
Suggested Reading Nutrition 101
Using Salt
Maintenance FAQs
source taken from: http://wiki.answers.com/
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