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Fish Health Overview


Acquire your fish from a reputable source, do your best to make sure they are disease free. They should be alert, active, and have erect fins.
An invaluable piece of equipment is an extra tank set aside for quarantine purposes; this should be set-up with a cycled filter, a heater, and should be completely netted. This can be used as a hospital tank, or a quarantine tank for new stock and will go a long way to ensuring that you have a disease free environment for your fish.
 
In general fish are quite resistant to disease, provided there are no unfavorable conditions present that may weaken their resistance. By far the majority of disease outbreaks are due to poor water conditions, which may directly poison the fish, or indirectly make them susceptible to diseases.
 
Poor water conditions may include any of the following:
  Chlorine - needs to be non-detectable.  Always use a dechlorinator.
  Ammonia - needs to be non-detectable.  Amquel can be used in emergencies.
  Nitrite - needs to be non-detectable.  alt at .1% can be used in emergencies.
  Nitrate - should be less than 20.  Greater than 80 can be dangerous.
  Metals such as lead, copper, or zinc for example, are extremely toxic.
  Insecticides, even in low concentrations, are harmful and often fatal.
   
  Temperatures should be adjusted slowly, ideally only 2-4 degrees per day. Sudden lowering of the temperature is worse than rising temperatures. Sudden lowering may cause shock and/or shimmies (weaving back and forth, like swimming without going forward). Sudden rises may cause respiration difficulties, where gasping and surface hugging may be observed.
     
  PH should be noted both in the morning and in the evening. Often it will be higher in the evening. There should not be more than a 0.2 PH change in 24 hours. A PH crash (PH going from alkaline to acidic) is very dangerous and needs immediate attention if the fish are to survive. Adequate buffering, i.e.,alkalinity is necessary to prevent this condition.  
   
  Oxygen: Levels should be maintained as close to saturation as possible. This often means additional airstones or diffusers on the bottom drains. Low levels of oxygen show up as gasping close to the surface and/or hanging around the waterfalls near the surface.in an attempt to take in gulps of air
   
  Feeding: Fish do not need as much food as one may imagine, as a result far too much food goes into the pond where it sinks to the bottom and starts to rot. Extra food that is consumed by the fish also falls to the bottom as excrement, where this too starts to rot. All this of course creates more ammonia and contributes to filth in the pond. Just one more reason to have bottom drains and lots of filtration.
  An incorrect diet can give rise to various problems, not all of which are immediately evident. To much fat and carbohydrate can lead to fatty deposits in the tissues, and degeneration of internal organs such as the liver. Use high quality feed and give the fish some treats, e.g., watermelon, shrimp, krill, peas, lettuce, etc.
       
Indicators of poor health may include any of the following:
  Gasping at the surface
  Rubbing against objects (flashing)
  Red spots or sores    
  Frayed or red fins    
  Isolating from others    
  Loss of appetite
  Listless behavior
  Becoming darker or lighter in color (This could also be due to stress)    
   
There can be clues to the cause of ill health, including:
  If only one or two are affected this could suggest a non-infectious disease or injury..
  If a small number are affected initially, but then this number increases, then this shows the signs of an infectious disease.
  If all of the fish in the pond are affected at once, and occurs rapidly, then this points to it being a water quality problem.
       
Being a fishkeeper and knowing the normal behavior pattern of your fish gives you the ideal opportunity to recognize any unusual or abnormal behavior that they may display.
       
Good pond hygiene, and only the best water quality, is the main key to successful fish keeping. It is usually possible to correctly identify why a fish is unhealthy. By using a step-by-step approach, and considering all of the possibilities, you can achieve a result, and the correct treatment can then be administered. Don’t jump to conclusions, it must be decided first of all why the fish is behaving the way that it is, and the reason for it doing so. Many beginners start out in the hobby with good intention, only to give up because their fish become ill or die for no apparent reason. This gets too much, and they loses all confidence, and have no enthusiasm to try again.