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Chemical Treatments parts per million (ppm) Instructions: Treat ponds 3 & 4 which have 500,000 Chum in each for bacterial gill disease with 1.5 ppm Potassium Permanganate for 60 minutes plus exchange. Calculate Exchange Rate: 4,228 + 3,400 = 7,628 cu. ft. 7,628 X 7.48 = 57,057 gal. to treat 57,057 gal / 1,122 gpm flow = 50.85 min exchange Needed 1 gallon units to drip: 60 min treatment + 51 min exchange = 111 min treatment 111 total min / 10 min 1 gallon units = 11.1 or 12 gal units Total treatment is 12 – 1 gal units which will be dripped 120 min Chemical Calculation: 1,122 gpm water flow X 10 min = 11,220 gallons in 10 min 11,220 gpm X 3,785 ml/gal = 42,467,700 = 42.46 ml (for 1 ppm) 1,000,000 1,000,000 42.46 ml or grams X 1.5 ppm (wanted strength) = 63.69 g Or 64 grams / 1 gallon unit dripped every 10 min for 120 min. Advantages of Drip Treatments: 1) There are not hot spots of chemical in the pond 2) The chemical slowly increases in strength 3) The chemical slowly decreases in strength 4) There is a longer exposure to the chemical 5) Less immediate stress and less mortality 6) Exposure to workers and general public is reduced Note: If a salt lick block or bag of salt is added to the pond during the treatment, it will reduce stress to the fish as well as dehydrate the parasite or bacteria, making the treatment more effective. PowerPoint Presentation done by: Old Chum Productions Earl Steele Bellingham Technical College Whatcom Creek Hatchery Bellingham, Washington 98225 360-752-8352