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A commercial pay-to-fish lake had heavy algae blooms and high levels of nutrients. The lake is 8 acres and 10 feet in depth. The lake is stocked with over 25,000 lbs of carp and 10,000 lbs of catfish. Fish are fed daily with a high protein fish food. We tested the water for phosphates and nitrogen and discovered the nutrients levels were high. We also tested dissolved oxygen (DO) to get a feel of oxygen levels at the bottom of the lake, biochemical oxygen demand (BOD) to see how much oxygen was needed to create an environment for aerobic bacteria and oxidation reduction potential (ORP) and found that there was limited oxygen supply towards the bottom of the lake and a very high BOD resulting in almost zero aerobic bacteria activity.
PRESCRIPTION: – We need to increase oxygen levels to promote healthy fish and aerobic bacterial activity as well as bring down nutrient levels. Based on the depth and size of the lake, we recommended TWO AM100, 6 plate, deep water aeration systems.
RESULTS: We tested DO, BOD, ORP, Nitrogen & Phosphates initially and once a month after for 3 months. DO increased and became saturated throughout the water column. BOD dropped near zero. BOD, nitrogen and phosphates dropped dramatically to almost zero in the first 90 days.
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