Is your fishery affected, and if so, to what extent?
The only way to be sure is to find out the level of phosphorus present. Sadly the pond or aquarium test kits from pet stores don’t quite cut it when it comes to testing for eutrophication, as the levels we are talking are very low, less than 1ppm (part per million).
Also aquarium or pond kits generally only account for the phosphorus that is ‘free’ in the water column and not the phosphorus which is ‘locked up’ in the silt.
Hence the procedure to obtain the overall level of phosphorus or ‘Total P’ whilst not being prohibitively expensive, is quite a complex process, encompassing the following steps.
- Sample collection.
- Heating to 500C remove excess organic matter.
- Acid digestion with oxidizing agent at 150C for one hour.
- Phosphorus level measured with spectrophotometer.
Only when this process is fully complete can we ascertain if, and to what extent, eutrophication affects your fishery. As part of the service we then begin the process of advising you on how to manage the problem.