Stock assessment of east coast tarakihi (TAR 1,2,& 3)

Trophia was contracted by the New Zealand Ministry of Fisheries to develop a stock assessment model for Tarakihi (Nemadactylus macropterus) off the east coast of New Zealand. Specific objectives of the project were: To characterise the TAR 1 fishery and update the standardized CPUE indices for TAR 1 using data up to the end of the 2010/11 fishing year. To characterise the TAR 2 fishery and update the standardized CPUE indices for TAR 2… Read More

Weighting of catch at age data in stock assessment models

Trophia is contracted by the New Zealand Ministry of Fisheries (MFish) to develop techniques to improve the stock assessment of harvested fish stocks. Specific objectives include: To determine the appropriate weighting of catch at age data in stock assessment models Stock assessment models often use data inputs from a variety of sources, including catch sampling and abundance surveys. The biomass indices obtained from abundance surveys (or CPUE analysis) are assumed to follow… Read More

Fine scale reporting of catch effort information

Trophia was contracted by the New Zealand Ministry of Fisheries MFish, to consult and report on options for improving the spatial resolution in catch and effort data from New Zeland fisheries. The demand for more spatial resolution in fisheries catch-effort data comes from managers, scientists and compliance officers and is driven largely by the movement towards managing fisheries at a finer spatial scale. Several options exist for improving the spatial resolution of… Read More

Characterisation of the Alfonsino fishery in BYX 3

Trophia was contracted by the New Zealand Ministry of Fisheries (MFish) to characterise the alfonsino (Beryx splendens ) fishery by analysis of existing commercial catch and effort data and data from other sources; and make recommendations on appropriate methods to monitor or assess the status of this fishstock. The specific objectives for this project include: 1. To characterise the BYX fishery by analysis of existing commercial catch and effort data and data… Read More