Updated catch-per-unit-effort indices for three substocks of tarakihi in TAR 1, 1989-90 to 2003-04.

By: Kendrick, Terese H.
Material type: materialTypeLabelBookSeries: New Zealand fisheries assessment report ; 2006/14.Publisher: Wellington : Ministry of Fisheries, 2006Description: 66 p. : figs. ; 30 cm.ISSN: 1175-1584.Subject(s): EAST COAST NORTH ISLAND | WEST COAST (NORTH ISLAND) | BAY OF PLENTY | FISHERIES | TARAKIHI | FISHING EFFORT | STATISTICAL METHODSOnline resources: Click here to access online In: New Zealand fisheries assessment reportSummary: The previous indices (Project TAR 1999/01) provided standardised CPUE analyses for TAR 1, split into two areas, TAR I (west) and TAR 1 (east), at Cape Reinga. The indices were based on estimated catch from successful days only (with respect to tarakihi) in all single bottom trawl fisheries, including both target and bycatch data, with target species offered as a possible explanatory variable. On the basis of updated knowledge on the biology and stock identity of tarakihi (Nemadactylus macropterus), it was considered desirable for TAR 1 East to be further divided into Bay of Plenty, and TAR I East, so that three separate biological substocks are monitored. Other improvements to the standardised CPUE analysis include the use of landed greenweight rather than estimated catch, and a combined lognormal/binomial model to incorporate zero catch information from associated bycatch fisheries. Both these measures have become widely accepted for inshore species that are monitored in mixed target fisheries; i.e., where the nominal target species reported by the fisher is not relied on to delineate the effective effort, but rather all effort in a more broadly defined fishery is included. This is relevant to TAR 1 because of the concerns expressed by Field & Hanchet (200 l) that target species might not be consistently reported and should, to some degree, be ignored.
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NO. 2006/14 1 Available J09441

The previous indices (Project TAR 1999/01) provided standardised CPUE analyses for TAR 1, split into two areas, TAR I (west) and TAR 1 (east), at Cape Reinga. The indices were based on estimated catch from successful days only (with respect to tarakihi) in all single bottom trawl fisheries, including both target and bycatch data, with target species offered as a possible explanatory variable. On the basis of updated knowledge on the biology and stock identity of tarakihi (Nemadactylus macropterus), it was considered desirable for TAR 1 East to be further divided into Bay of Plenty, and TAR I East, so that three separate biological substocks are monitored. Other improvements to the standardised CPUE analysis include the use of landed greenweight rather than estimated catch, and a combined lognormal/binomial model to incorporate zero catch information from associated bycatch fisheries. Both these measures have become widely accepted for inshore species that are monitored in mixed target fisheries; i.e., where the nominal target species reported by the fisher is not relied on to delineate the effective effort, but rather all effort in a more broadly defined fishery is included. This is relevant to TAR 1 because of the concerns expressed by Field & Hanchet (200 l) that target species might not be consistently reported and should, to some degree, be ignored.

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