Currently, the Oxic, Hypoxic, and Anoxic site classifications are assigned to each marine finfish aquaculture facility based on the average sediment sulfide concentration and are indicative of a facility's impact along an organic enrichment gradient. In years previous to 2007, site classification was based on sediment sulfide concentration as well as redox.
Oxic is the site classification assigned when the average sediment sulfide concentration is less than 1500 µM - good performing site with minimal remedial action required.
Hypoxic is the site classification assigned when the average sediment sulfide concentration is between 1500 µM and 6000 µM. - sites are likely to cause adverse environmental affects and will be required to undertake a number of remedial measures.
Anoxic is the site classification assigned when the average sediment sulfide concentration is greater than 6000 µM. - sites are causing sever damage to the marine habitat. Sites will be directed to work closely with regulatory agencies to remedy the situation.
Remediation Plans describe the actions that will be taken by the Approval Holder to reduce organic enrichment impacts. These actions are aimed at reducing organic loading by implementing best management practices such as improving feeding methods, not cleaning nets or equipment onsite, reducing stocking density, repositioning of cages in relation to onsite water currents, staff training and internal and external audits to ensure that best management practices are being followed.