Relative abundance of snapper in SNA 8

Trophia was contracted by the New Zealand Ministry of Fisheries (MFish) to analyses catch an deffort data for snapper in SNA 8. The specific objective for this project was to characterise the SNA 8 fishery and update the CPUE analyses for trawl fisheries in each area of SNA 8 using data up to the end of 2007-08. The snapper fishery is New Zealand’s most valuable inshore finfish fishery by value. SNA 8 is the… Read More

Stock assessment of TRE 7

Trophia has been contracted by the New Zealand Ministry of Fisheries (MFish) to conduct a stock assessment for trevally (Pseudocaranx dentex) in TRE 7, including estimating biomass and sustainable yields. The specific objectives for this project include: 1. To update the descriptive analysis of the TRE 7 fishery up to the end of the 2007/08 fishing year. 2. To review and summarise the historical biological and other relevant data (including length frequency,… Read More

Characterisation of the New Zealand tuna fisheries

Trophia has been contracted by the New Zealand Ministry of Fisheries (MFish) to To characterise the New Zealand tuna fisheries, including catches of important associated tuna like species. The specific objectives for this project include: 1. To characterise the New Zealand tuna fisheries for albacore (Thunnus alalunga), bigeye tuna (T. obesus), Pacific bluefin tuna (T. orientalis), skipjack tuna (Katsuwonus pelamis), southern bluefin tuna (Thunnus maccoyii), yellowfin tuna (T. albacares), and swordfish (Xiphias… Read More

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

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

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

Fisheries monitoring programs in the Southern Gulf of Carpentaria – a data review

This project reported on the fisheries component of the Southern Gulf Environmental Information Program (SGEIP) undertaken by the Australian Centre for Tropical Freshwater Research (ACTFR) on behalf of the Department of State Development, Queensland. The ACTFR is a research and consultancy centre established within James Cook University in 1987 to promote water research, technology and information transfer to industry. The general objective was to critically assess existing fisheries monitoring information in the… Read More