76 Figure 20: NMDS ordination of periphyton communities for sites on the Ohinemuri River, 2009-2017. Presence-absence data from OGNZL biomonitoring programme. 13.6.6 Selenium As part of the OGNZL monitoring programme required by the treated water discharge consent, selenium is currently monitored in the treated water discharge, river water, river sediments, macrophytes, periphyton and fish. Previously, whole fish body selenium sampling has been conducted in accordance with the methods provided in USEPA (1998). Composite samples of shortfin eels and common bullies from sites upstream and downstream of the WTP discharge points were collected for selenium fish tissue analysis, but currently only tissue from bullies is assessed for selenium.
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