Additional for net pens/net cages in marine systems:
Under or within 30 meters of net pens, sediment samples from soft bottom benthic
environments (mud, sand, or shell) must have Redox potential levels greater than -
100 mV nhe, or sulfide levels below 1300 micromoles prior to stocking fish.
Producer guidance:
Take sediment samples and measurements in a manner than prevents
contamination of samples from oxygen in water or air
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