The Trichodina koi parasite is another of the microscopic pests that sometimes attack our pet koi fish. Generally speaking, Trichodina alone will not kill your koi; rather it damages the skin and gills of the fish which can lead to bacterial infections. However, these secondary bacterial infections are notorious for death loss in koi collections. Instead of piercing the skin to locate and feed on blood like so many other parasites, the Trichodina dine on bacteria in the pond water. It uses the koi as merely a place of residence, all the while inflicting damage to the skin and gills of the host as it spins and gyrates continually.
Trichodina has various options of treatment. They are in order of the best method.
• Potassium Permanganate (PP) 1.5 grams per 220 gallons or 1.5ppm. Keeping the water purple for a minimum of 2 hours should effectively kill Trich. The general rule is to keep it purple for 4 hours, additional 1/4 or 1/2 doses may be required in ponds with heavy bio load. When water starts to go brown the PP is spent and not doing anything else. To neutralise PP either Hydrogen Peroxide (HP) or Sodium Thiosulphate (ST) can be used. Always add lots of extra air to a pond when treating with PP as it is an oxidising agent. Where possible avoid feeding for 24 hours prior to using PP. It is usually a good idea to do a deep clean of the filers and system to avoid having more organic matter in the pond for the PP to consume.
• Malachite Green (MG) and Formalin (F) Not to be used below 13̊C MG 2% 10ml per 176 UK gallons F 30% at 10ml per 140/150 UK gallons
• Chloramine T *Kusuri* 15-20 grams per 1000 gallons for 4 doses. Not effective in temps below 11̊C.
• Salt Remember NOT to use salt if Formalin or PP is in the pond already. Use an accurate salt meter to ensure the percentage or ppt is safe. 0.3% starting dose to slowly increase to 0.6% over 24 hours. Any further salt increases should be done slowly. Bear in mind that Trichodina also thrives in marine environments.
*Remove any Zeolite from the filters as the salt will release ammonia from it. Keeping on top of pond and filter maintenance will help reduce the occurrences of Trichodina.
Any treatments added are done so at your own risk. It is your responsibility to know your pond volume and to calculate dosages correctly.
> Scrape the Koi first before treatment
> Identify which Parasite is causing the problem before treatment
> Make sure the pond water is salt-free because it can harm Koi when used with most chemicals
> Calculate the Volume of Water accurately
> Turn off the UV Unit when treating your Pond
> Test your Water Parameters before Treatment
> Follow the label’s instructions and do not overdose. Chemicals can cause serious damage to your Koi if amounts are miscalculated