Review future recruitment assumptions in stock projections

Trophia was contracted by the New Zealand Ministry of Fisheries (MFish) to review future recruitment assumptions in stock projections. In managing fisheries, future projections of biomass from assessment models are usually used to determine appropriate catch limits in the short to medium term. If recruitment variation has a large impact on the biomass, estimation of future recruitment is essential for robust management. Projections may require assumptions to be made on the recruitment… Read More

Monitoring the recreational blue cod and sea perch fishery in the Kaikoura – North Canterbury area

Trophia was contracted by the New Zealand Ministry of Fisheries (MFish) to monitor the recreational blue cod (Parapercis colias) and sea perch (Helicolenus percoides) fishery in the North Canterbury – Kaikoura area. The specific objectives for this project include: 1. To monitor changes in recreational catch rates of blue cod and sea perch in the North Canterbury – Kaikoura area from a boat ramp survey. 2. To monitor changes in the size… Read More

The status of the major blue moki fishstocks.

Trophia was contracted by the New Zealand Ministry of Fisheries (MFish) to characterise the MOK 1 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. This project was funded by MFish project MOK2002-01 Outputs include presentation of results to a Ministry of Fisheries Inshore Working Group meeting in March 2004. A… 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

Development of “Tag Tracker” software

The New Zealand Rock Lobster Industry Council (RLIC) accepted a proposal from Trophia to develop tag tracking software. “Tag Tracker” will be an internet-based database that will allow fishermen to enter the details of a tag from a captured lobster and obtain a report of its release-recapture history The expected benefits of the “Tag Tracker” software include: · The ability for fishermen to enter tag information directly into a central database and… Read More

Fishery Characterisations and CPUE analyses in support of the NZ Adaptive Management Programme

Trophia was contracted by the New Zealand Seafood Industry Council (SeaFIC) to assist with analyses required under the the adaptive Management Programme. The adaptive Management Programme (AMP) was introduced in 1991 by the NZ Ministry of Fisheries (MFish) as a basis for varying the levels of Total Allowable Commercial Catch (TACC) of fishstocks for which there is limited information on stock size. New proposals include a descriptive analysis of current knowledge and… Read More

Recreational fishing surveys in the Southern Gulf of Carpentaria – a pilot study

Information on the catch and effort of recreational fishing in the Southern Gulf of Carpentaria is required to ensure the sustainability of fishing activities, and preserve the unique environment and wilderness aspects of this area. The Southern Gulf includes some of the prime recreational fishing locations in Australia with estimates upwards of 80,000 visitors to Karumba and Burketown each year during the winter season . However, a review by Hart (2002) found… Read More

Stock Assessment of the New Zealand Rock Lobster Fishery 2003-04

Trophia is contracted by the New Zealand Rock Lobster Industry Council (NZRLIC) to undertake stock assessment research on New Zealand’s rock lobster fishery for the Ministry of Fisheries. Generalised linear models are used to summarise temporal and spatial trends in the catch rates of lobsters. Trophia is assisting in the development of a size structured population dynamics model for rock lobster stocks in New Zealand. This model will enable estimation of population… Read More

Stock assessment of trevally in TRE 7

Trophia was contracted by the New Zealand Ministry of Fisheries (MFish) to carry out a stock assessment for trevally ( Pseudocaranx dentex ) in TRE 7, including estimating biomass and sustainable yield.The specific objectives for this project were: 1. To update the standardised and unstandardised CPUE analyses for TRE 7. 2. To update the current TRE 7 stock assessment including estimating biomass and sustainable yield. This project was funded by the New… Read More

Characterisation of the red gurnard fisheries in GUR 2

Trophia was contracted by the New Zealand Ministry of Fisheries (MFish) to characterise the red gurnard ( Chelidonichthys kumu ) fishery in GUR 2 and those of associated species taken by the Area 2 inshore trawl 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 individual Fishstocks or groups of species combined This… Read More