74 purposes. The migration (and spawning) periods are often associated with specific environmental conditions such as rainfall, river flows, temperature, lunar cycles and tidal regimes. Elevated river flows have been considered as a cue for migration upstream. The Ohinemuri River is also an important rainbow trout fishery, with spawning grounds in the river tributaries, and is classified as a significant trout fishery. Figure 18: Boxplots of Chlorophyll a (chl-a) for Autumn and Spring a) for each site on the Ohinemuri River, 2008-2021 and b) for each sampling year. Data from OGNZL biomonitoring programme. The red reference line indicates guidelines for protecting benthic biodiversity (50 mg/m2 and 200 mg/m2, Biggs 2000). See Appendix 7 for interpretation of boxplots.
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