The objective of this work was to update catch histories and data series for the trevally (TRE 1) stock assessment. This included investigating alternative stock hypotheses and whether incorporating water clarity data might improve bottom trawl catch-per-unit-effort model fits.
Trevally in the East Northland – Hauraki Gulf region are now believed to be of the same stock, and preference of the west or east of the Northland region is likely driven by an environmental factor. Incorporating water clarity did not improve the model for the East Northland – Hauraki Gulf region.
Trevally in the Bay of Plenty and TRE 2 are thought to be mixing, but the available data could not define the spatial or temporal extent of that mixing. The accepted CPUE index for this region was based solely on the Bay of Plenty.
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