Surveys of pre-recruits of red rock lobster ( Jasus edwardsii ) in CRA 8 using modified commercial pots – a pilot study

This pilot study examined the feasibility of obtaining a pre-recruit abundance index with a modified pot design in CRA8. It complemented objective 8 of the 2000-01 Ministry of Fisheries rock lobster research project, which was to examine the relationship between recruitment indices derived from puerulus collectors, juvenile dive surveys and the observer and logbook catch sampling programmes and make recommendations on the most appropriate way of predicting recruitment to the fishery. Information… 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

Development of techniques for presenting management strategy evaluations to stakeholders

This project was funded by the New Zealand Seafood Industry Council (SEAFIC) Output includes : Participation in the xxx workshop Hobart Jan 2004

Stock Assessment of the New Zealand Rock Lobster Fishery 2002-03

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 barracouta

Trophia was contracted by the New Zealand Ministry of Fisheries (MFish) to carry out stock assessments of barracouta, including estimating biomass and sustainable yields. The specific objectives for this project include: 1. To determine the relationship between barracouta on the East Coast and West Coasts of the South Island and with the stock in BAR 5. 2. To carry out stock assessment of barracouta (BAR 5) including estimating biomass and sustainable yields…. 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

New Zealand Rock Lobster Industry Voluntary Logbook Programme

Rock lobster fishers in many parts of New Zealand keep logbooks in which they record the size, sex and stage of maturity for the lobsters they catch. Currently logbook data is used in the stock assessment process and to generate annual summaries to participants. The extensive nature of the logbook sampling provides data that is more representative of the catch than intensive research sampling. As a consequence, the new size-structured model, used… Read More

Stock Assessment of the New Zealand Rock Lobster Fishery 2001-02

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

Rock Lobster Reproductive Success

Trophia Ltd. was commissioned to examine the available catch sampling data for evidence of changes in the reproductive success of rock lobster populations. Rock lobsters mate in late spring and early winter and females brood the fertilised eggs through the winter months. Since 1952, there has been a prohibition on the taking of egg bearing (“berried”) females to protect the fertilised eggs. Higher market prices during winter have resulted in most quota… Read More