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Mini-Seminar by Dr. Sandra Yosha On
a very rainy June 22 several club members attended the presentation by Dr. Sandra Yosha at
the home of Rick O’Shea. Jon Lockerman set up the mini-seminar. After Rick told us
about his pond and its liner made of carpet treated with fiberglass Sandy took over.
Her presentation was titles Koi Health Assessment and Quarantine which covered
a large area and was quite eclectic. She touched so many topics it would impossible to
mention them all here, but some items of interest were:
- Good water is always better an any treatment
- The more water you have for each fish the better off the fish will be.
- If you don’t decrease your fish load, Nature will take care of it for you.
- Chlorine can get into well water if a well nearby has been treated.
- Chlorine and Chloimine burn fish gills.
- PH of 6.8-8.5 is fine for koi but, pH swings are not. Keep your pH stable, even
if it is high.
- Fish metabolism tends to lower pH but a well buffered pond handles this
naturally.
- Ammonia is far more toxic in high pH water.
- Observe your fish often to know what normal behavior looks like.
- Use a mirror on the pond bottom to examine the underside of your fish.
- Flashing has many causes, many of them harmless.
- Evaluate fish behavior to detect problems.
- Putting in water from a submerged hose or from well water may cause gas bubble
disease. Always spray the water into the pond to overcome these problems.
- Obese fish are as unhealthy and subject to disease.
- Stop feeding after water temperature drops the 55F. Koi should fast through
winter to reduce excess fat and to reduce egg bound females.
- Bacterial infection is usually a secondary disease and antibiotics should be the
last treatment, not the first.
- All medications related to fish are temperature dependent. No medication works
below 55F..
- Quarantine for 3 months should catch 97% of fish disease problems.
- Japanese style koi shows are easier to judge but, fish are more likely to
contract a disease.
- The recently occurring mouth rot disease that has arrived from Japan is
apparently resistant to all commonly used antibiotics.
- Koi Herpes Virus came from Israel. It attacks the gills and fish die in 48 hrs.
- Never use salt in your pond that contains a rust protection chemical.
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