Characterisation & CPUE analysis of FLA1 and GMU 1

Trophia has been contracted by the New Zealand Ministry of Fisheries to monitor the relative abundance of grey mullet (Mugil cephalus) in GMU 1, and flatfish in FLA1.:

  1. To characterise the GMU 1 and FLA 1 fisheries.
  2. To update the standardised CPUE index for grey mullet (GMU1) and flatfish (FLA1), with the inclusion of data up to the end of the 2009/2010 fishing year.

GMU 1 and FLA 1 are divided into east and west coast substocks for assessment purposes, with the boundary between the two sub-stocks at North Cape. Fisheries are often harbour-based however, and targeting of Grey Mullet and flatfish using net methods is mostly done by small vessels that demonstrate considerable fidelity with respect to area, so that FLA 1 and GMU 1 are monitored in distinct subarea fisheries. It is considered likely that the same vessels fish for both species.
For management purpose nine species of flatfish (black flounder (BFL), brill (BRI), New Zealand sole (ESO), greenback flounder (GFL), lemon sole (LSO), sand flounder(SFL), Turbot (TUR), witch (WIT) and yellow belly flounder (YBF)) are combined to form a single fishery. Flatfish ITQ provides for the landing of all eight species. Since the introduction of flatfish into the QMS, fishers have been required to use the actual species code in the estimated catch section of catch effort forms, and the degree to which they have complied has improved steadily with time.