Fisheries reports and stock statistics
Fisheries New Zealand reports on the status of fish stocks and fisheries in New Zealand waters.
Annual stock assessment
Each year, we assess the status of as many fish stocks and fisheries as possible against the requirements of the Harvest Strategy Standard for New Zealand Fisheries.
Read the Status of New Zealand's Fisheries 2017 report [PDF, 2.3 MB]
Find out more
- Guidelines for the release of fisheries information [PDF, 359 KB]
- The Harvest Strategy Standard for New Zealand Fisheries 2008 [PDF, 309 KB]
- New Zealand's Quota Management System
- Detailed stock status information for individual stocks
Aquatic Environment and Biodiversity Annual Review
A summary of environmental interactions between the seafood sector and the aquatic environment
The Aquatic Environment and Biodiversity Annual Review (AEBAR) 2015 is a summary of environmental interactions between the seafood sector and the aquatic environment.
This, the 2014 edition of the Aquatic Environment and Biodiversity Annual Review (AEBAR), expands and updates previous editions. It summarises information on a range of issues related to the environmental effects of fishing and aspects of marine biodiversity and productivity relevant to fish and fisheries. This review is a conceptual analogue of the Ministry’s annual reports from the Fisheries Assessment Plenary. It summarises the most recent data and analyses on particular aquatic environment issues and, where appropriate, assesses current status against any specified targets or limits.
Whereas the reports from the Fisheries Assessment Plenary are organised by fishstock, the Aquatic Environment and Biodiversity Annual Review is organised by issue (e.g. protected species bycatch, benthic impacts), and almost all issues involve more than one fishstock or fishery.
This AEBAR document summarises information and, where appropriate, assesses current status against any specified targets or limits, on a range of issues related to the interactions between the seafood sector and the marine environment. This edition features some chapters updated from 2012 as well as new chapters on Chondrichthyans (sharks, rays and chimaeras), the ecological impacts of aquaculture, and Hector’s / Maui’s dolphins.
This is the second Aquatic Environment and Biodiversity Review (AEBAR). It summarises information on a range of issues related to the environmental effects of fishing and aspects of the marine environment and biodiversity of relevance to fish and fisheries. The review summarises the most recent data and analyses on particular aquatic environment issues and, where appropriate, assesses current status against any specified targets or limits.
The Aquatic Environment and Biodiversity Annual Review (AEBAR) summarises information on a range of issues related to the environmental effects of fishing and aspects of the marine environment and biodiversity of relevance to fish and fisheries. Developed over three years, this report summarises the most recent data and analyses on particular issues and, where appropriate, assesses current status against any specified targets or limits.
Aquatic Environment & Biodiversity Reports (AEBR)
Data on sea lion dives was used to construct a model that represents the process of sea lion exit from nets via Sea Lion Exclusion Devices. The model produces estimates of total sea lion deaths as a result of interactions with trawls, including any animals that run out of air after exiting the net. Under a range of assumptions, the results suggest scalers of between 1.2 and 1.5 for estimating total deaths from observed deaths.
A SEFRA model was developed for female New Zealand sea lions at the Auckland Islands. Inputs to the model included: the estimated at-sea spatial density of female sea lions, and cryptic mortality priors relating to SLED use. Across the last 3 years assessed, the estimated annual risk ratio across all Auckland Islands fisheries was 0.24 (95% credible interval (CI) = 0.11–0.47); consistent with population recovery to 97.5% of unimpacted status when assuming deaths at the upper 95% CI level.
Population models were developed for New Zealand sea lions at the Auckland Islands, including current demographic data. The base model was used to estimate an annual PST of 26 females. Future fishery deaths at the PST were estimated to result in a mature female population in 2025 that was 3.9% to 5.0% lower than that estimated in the absence of future squid fishery (SQU 6T) deaths; compared with 0.5% to 1.0% lower when future deaths were consistent with deaths estimated for the recent period.
A dynamic Bayesian modelling framework (including user interface) was developed for the assessment of unobservable mortality (e.g. due to carcass loss during net retrieval) of New Zealand sea lions that interact with trawls using sea lion exclusion devices. A base case model suggested that the total fishery-related deaths are underestimated by a factor of 1.15 (95% credible interval: 1.05-1.31) and 1.60 (95% credible interval: 1.20-2.63) for bottom trawls and mid-water trawls, respectively.
New Zealand Aquatic Environment and Biodiversity Report No. 214. 168 p.
A spatial risk assessment of threats was undertaken for Hector’s and Māui dolphins, to inform a revised Threat Management Plan (TMP) for the species. A Bayesian risk model was developed using the spatially-explicit fisheries risk assessment (SEFRA) approach, incorporating revised estimates of Hector’s and Māui dolphin spatial density and intrinsic population growth rate. The risk model was used to estimate spatial overlap, annual deaths and risk for commercial fisheries and lethal non-fishery threats, including toxoplasmosis. Spatial overlap was estimated for other threats.
New Zealand Aquatic Environment and Biodiversity Report No. 216.
An individual-based population model was fitted to genetic capture-recapture data collected during 2001-16 from Māui dolphins (Cephalorhyncus hectori maui), to estimate population size and trends. The population is estimated to be declining despite declining mortality rates. Forward projections under various scenarios imply that a further reduction of anthropogenic mortality of at least 50% is required to arrest population decline and avert extinction, regardless of the main source of the mortality, which is suspected to be fisheries bycatch and/or disease.
This document provides consistent and clear guidance for the benthic monitoring and management of salmon farms in the Marlborough Sounds (NZ). The protocol for conducting seabed surveys, as well as the compliance framework are contained within, and are based around an agreed set of environmental quality standards (EQS). This is a living document that is reviewed, updated and amended as required. It was initially released in 2015, and the 1.1 version reflects revisions resulting from its first review in 2018.
This report is a summary of work to develop a coherent dataset of benthic invertebrate distributions on Chatham Rise based on seabed photographic surveys. The dataset spans the full extent of Chatham Rise in depths from 40 m to 1850 m, combining analyses of 358 seabed transects from five surveys. The primary purpose of the dataset is to enable development of improved predictive models of faunal distributions that can be used to inform ecosystem-based management of the region.
This report summarises bycatch and discards in hoki, hake, ling, silver warehou, and white warehou trawl fisheries for 1990–91 to 2016–17, based on analysis of fisheries observer and commercial catch effort data. Javelinfish, other rattails, and spiny dogfish were the main bycatch species recorded by observers. Total annual bycatch for the period ranged from 17 500 t to 49 000 t; total annual discards (for 2002–03 to 2016–17) were 5000 t to 25 000 t and decreased significantly after 2002–03.
An understanding of marine animals’ movements is paramount for their effective management and conservation, especially with a changing climate. This project’s aim was to produce south Pacific Ocean carbon and nitrogen isotopic maps, referred to as “isoscapes”, to improve our understanding of species foraging habits and movements in marine ecosystems. The geographical variation in these isoscapes, over varying spatial scales, can contribute to many future BRAG/MPI projects.
New Zealand Aquatic Environment and Biodiversity Report No. 217. 62 p.
This study provides an indicative assessment of vessel traffic and seismic survey related noise. Vessel AIS data for the year of July 2014 to June 2015 was used to determine density and speed grids by vessel category. JASCO’s cumulative vessel noise model was used to model the sound from 15 vessel categories and two marine seismic surveys during representative summer and winter months in 1-minute time steps. Results are presented as maps, animations and plots of sound levels at static locations.
New Zealand Aquatic Environment and Biodiversity Report No. 215. 18 p.
A Bayesian Māui dolphin population model was developed integrating information from genetic “mark-recapture” and population size estimates. Model runs incorporated estimates of historical annual deaths from commercial fisheries and toxoplasmosis obtained from a separate spatial risk assessment. These models were then used to simulate the effects of estimated threat-specific mortality rates on future population growth.
D’Archino, R.; Neill, K.F.; Nelson, W.A.; Fachon, E.; Peat, C. (2019). New Zealand Macroalgae: Distribution and Potential as National Scale Ecological Indicators.
New Zealand Aquatic Environment and Biodiversity Report No.207. 217 p.
Canopy-forming macroalgae are internationally recognised as critical components of coastal ecosystems as primary producers, coastal buffers and provision of habitat. This report evaluates the use of large brown macroalgae as indicators of ecosystem health by: summarising the international and national literature; testing the responses of key species to stressors in culture; investigating a range of approaches to mapping and monitoring, including the use of drones and machine learning to analyse underwater videos.
Tuck, I.D.; Hewitt, J.E.; Bulmer, R.H. (2019). Monitoring Recovery of Benthic Fauna in Spirits Bay.
New Zealand Aquatic Environment and Biodiversity Report No. 206. 74 p.
This report describes changes in the benthic communities of Spirits Bay related to fishing pressure and environmental factors. Survey data were analysed from 2006, 2010 and 2017. Epifaunal and infaunal communities consistently identified year, habitat, depth and fishing effects. Weaker fishing effects were detected from recent surveys, where fishing effort was lower. Species identified as sensitive to fishing were previously identified as sensitive on the basis of life history and morphology.
This assessment presents bycatch estimates of seabirds in commercial trawl and longline fisheries in New Zealand’s Exclusive Economic Zone. The estimation relied on statistical models that used fishing effort and observer data up to the 2015–16 fishing year. Estimates for the latter fishing year included a total of 4517 (95% credible interval: 3760–5825) seabird captures in trawl and longline fisheries in New Zealand waters.
This report summaries annual estimates of bycatch levels of individual fish and invertebrate species in the trawl fisheries for arrow squid, hoki/hake/ling, southern blue whiting, jack mackerel, orange roughy, oreo, scampi, and the longline fishery for ling from 1990–91 to 2016–17. Total annual bycatch was estimated using a statistical model method, replacing a ratio estimator-based method used in previous iterations of this work.
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