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Hello,My name is XXXXX XXXXX I'm a biologist with many years experience keeping fish.. I'm sorry to hear of the loss of your koi.Some additional information will help me figure out what might be wrong.What numbers did you get when you tested the water- ammonia and nitrites in parts per million (ppm) and for the pH?What is the water temperature?Check the sick fish very carefully. Do you see red veins in the fins or tail?How big is your pond (liters or gallons)? How many fish are in it and how long are they (head to tail tip)? How long has the pond been established?Thank you.Anna
Water tests where done with the simple colour charts.
water temp 20 degrees +
haven't seen any red veins ( it is night time here so can't check.
pond is 2300 gallons
6 x Koi about 8 to 14 inch long
7 x shubumkins 4 to 6 inch long
20 to 40 shubumkin fry from 1 to 3 inch long
both where zero
Both where Zero