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This site contains documents relating to Fisheries New Zealand and predecessors’ funded research from 1988 to the current date. To find the documents applicable to you, please expand the filter and select the relevant search parameters. If you identify errors or inconsistencies in the categorisation of specific documents please advise us by emailing Science Officer.
 
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FAR 2023/4819/09/2023
Title: FAR 2023/48 The 2022 stock assessment of hake (Merluccius australis) off the west coast South Island (HAK 7)
FAR-2023-48-The-2022-Hake-Stock-Assessment-HAK7-4389.pdf (12.1 MB)
 This report summarises the stock assessment of hake off the west coast South Island (WCSI) in HAK 7 for the 2021–22 fishing year. The index of abundance was the WCSI trawl survey. Initial spawning stock biomass was estimated as 78 870 t (95% CIs 74 140–84 810) with current status of 39% B0 (95% CIs 30–52% B0). Five-year projections showed that biomass would increase under average recruitment but would remain flat if future recruitments were low and catches were the same as the TACC.
AUTHOR: Dunn, A.; Mormede, S.; Webber, D.N;
2023/4419/09/2023
Title: FAR 2023/44 Descriptive analysis and model inputs for the 2022 stock assessment of hake (Merluccius australis) off the west coast South Island (HAK 7), to the 2020–21 fishing year
FAR-2023-44-Descriptive-Analysis-And-CPUE-For-Hake-HAK7-To-2020-01-4388.pdf (14.7 MB)
 This report summarises the WCSI hake (HAK 7) fishery with spatial structure of the stock, biological parameters, and standardised catch per unit effort (CPUE). The CPUE indices were similar for the tow-by-tow data and the daily summary data and showed a similar trend to the Sub-Antarctic trawl surveys. In general, the CPUE indices had declined over the period of fishing but had levelled off in recent years as the total catch declined.
AUTHOR: Dunn, A.; Mormede, S.; Webber, D.N.;
 04/09/2023
Title: FAR 2023/47 2022–23 International Spatial Modelling Workshop Programme: NIWA Yellowfin tuna simulation study.
FAR-2023-47-International-Spatial-Modelling-Workshop-Programme-NIWA-Yellowfin-Tuna-Simulation-4325.pdf (11.1 MB)
This report presents the NIWA analysis of simulated Indian Ocean Yellowfin tuna (IOYT) data as part of the 2022–23 International Approaches and Advancements in Spatial Stock Assessment workshop programme. Two stock assessment model structures were developed and evaluated and are the focus of this report: a single area model which used the aggregated datasets, and a fleets-as-areas model.
FAR: 2023/47;
ISSN: 1179-5352;
ISBN: 978-1-991087-79-9;
AUTHOR: Marsh, C.; A’mar, T.; McKenzie, J.; Hoyle, S.;
 01/09/2023
Title: FAR 2023/46 The 2023 stock assessment and management procedure evaluation for pāua (Haliotis iris) fisheries in PAU 5D
FAR-2023-46-2023-Paua-PAU5D-Stock-Assessment-And-Management-Procedure-Evaluation-4401.pdf (4.7 MB)
The present project provides an update to the pāua (Haliotis iris) stock assessment for quota management area (QMA) PAU 5D and tested control rules to aimed at rebuilding catch towards the Total Allowable Commercial Catch. The findings suggested that the stock has been rebuilding and is now as likely as not to be at the interim management target. The harvest control rule from 2016 was updated to include a lag year on increases and a maximum 5% limit on year-on-year increases.
FAR: 2023/46;
ISSN: 1179-5352;
ISBN: 978-1-991087-75-1;
AUTHOR: Neubauer, P.; Kim, K.;
2023/4530/08/2023
Title: FAR 2023/45 Acoustic Biomass Surveys of Orange Roughy in ORH 3B North Chatham Rise, June/July, 2021
FAR-2023-45-Acoustic-Orange-Roughy-Surveys-ORH3B-June-July-2021-4301.pdf (15.2 MB)
 Acoustic biomass surveys of orange roughy (Hoplostethus atlanticus) in ORH 3B North Chatham Rise spawning grounds, 4–8 July 2021, on FV Amaltal Apollo. Surveys were undertaken on Morgue and Graveyard hills in NWCR and on the Rekohu aggregation in ESCR. The survey was prematurely curtailed due to vessel engine failure. Ancillary biomass estimates for Rekohu and Spawn Plume aggregations were derived from hull-mounted echosounder snapshots undertaken by FV Amaltal Mariner and FV San Waitaki. 
AUTHOR: Ryan, T.E.; Tilney, R.; Downie, R.;
32021/08/2023
Title: AEBR 320 Population size estimate of New Zealand sea lion (Phocarctos hookeri) for 2022
AEBR-320-New-Zealand-Sea-Lion-Population-Estimate-For-2022-2023-4420.pdf (6.3 MB)
 The total species population size estimate of New Zealand sea lion/pakake/whakahao was updated using the available demographic and population size information up to 2022 (the 2021–22 breeding season). All analyses were conducted within a Bayesian estimation framework, and the posterior total population size estimate was approximately 10 000 individuals in 2022 (median: 10 151; 95% credible interval: 8702–12 082 individuals), slightly below the estimate for 2015 using the same method.
AUTHOR: Roberts, J.; Edwards, C.T.T.;
31911/08/2023
Title: AEBR 319 Development of spatial fisheries risk assessment methods for sharks and turtles in New Zealand waters
AEBR-319-Spatial-Fisheries-Risk-Assessment-Method-Development-For-Sharks-and-Turtles-4405-2023.pdf (18.0 MB)
 A novel spatial risk assessment framework is proposed, based on the Spatially Explicit Fisheries Risk Assessment (SEFRA) and the Sustainability Assessment for Fishing Effects (SAFE). Risk is the probability that exploitation exceeds the Impact Sustainability Threshold (IST). Exploitation is estimated from the catchability and effort, using prior information on either the catchability or the population size. It is applied to shark and turtle species with different data characteristics.
Author: Edwards, C.T.T.;
2023/4310/08/2023
Title: FAR 2023/43 The 2022 stock assessment of red rock lobsters (Jasus edwardsii) in CRA 2
FAR-2023-43-The-2022-Stock-Assessment-For-CRA2-Red-Rock-Lobster-4395.pdf (21.6 MB)
This report documents the 2022 stock assessment of red rock lobsters in CRA 2. The model was fitted to length frequency data, sex ratio data, tag-recapture growth increment data, and standardised catch-per-unit-effort indices using the lobster stock dynamics model. This stock assessment estimated generally increasing exploitation rates throughout the stock’s history. Catch cuts and a period of improved recruitment have helped the stock rebuild since the 2017 stock assessment. 
Author: Rudd, M.B.; Pons, M.; Webber, D.N.; Starr, P.J.; Roberts, J.; Goeden Z.D.;
2023/4210/08/2023
Title: FAR 2023/42 Data for the 2022 stock assessment of red rock lobs
FAR-2023-42-Data-for-2022-Stock-Assessment-For-CRA2-Red-Rock-Lobster-4390.pdf (19.5 MB)
 This report documents the data used by the 2022 stock assessment of red rock lobsters in CRA 2. The data sets described include: catch estimates from commercial, recreational, customary, and illegal components of the fishery; standardised catch-per-unit-effort indices; standardised catch length-frequency distributions and sex ratios; tag-based growth information; and the proportion of mature females that were in berry (egg-bearing).
Author: Roberts, J.; Webber, D.N.; Starr, P.J.; Rudd, M.B.; Pons, M.; Goeden, Z.;
2023/4010/08/2023
Title: FAR 2023/40 Assessment of hoki (Macruronus novaezelandiae) in 2022
FAR-2023-40-Hoki-2022-Stock-Assessment-4349.pdf (23.2 MB)
 A fully integrated stock assessment is presented for HOK 1 modelled with two stocks (western and eastern) and with fish residing in four regions. The western stock is estimated to be lower than the eastern stock, with biomass expected to be 25–43% B0 in 2027 under current catch levels for the western stock and 46–55% B0 for the eastern stock. A simpler model with one stock and one region estimated current biomass to be 37–45% B0 in 2022. Target range for hoki is 35–50% B0.
Author: McGregor, V.L.; Dunn, M.R.; Langley, A.D.; Dunn, A.;
2023/4110/08/2023
Title: FAR 2023/41 Bottom trawl Catch-Per-UnitEffort indices for snapper in the Hauraki Gulf and east Northland (SNA 1), to 2020/21
FAR-2023-41-Snapper-CPUE-For-Hauraki-Gulf-And-East-Northland-Trawl-Fisheries-To-202021-4414.pdf (8.9 MB)
A spatial analysis of catch and effort data from the SNA 1 bottom trawl fishery was used to refine the boundary of the East Northland and Hauraki Gulf snapper stocks. For the two stock units, bottom trawl CPUE indices were derived for the spring-summer period. The two sets of CPUE indices were included in the 2023 stock assessment of SNA 1. 
Author: Langley, A.D. (;
2023/3910/08/2023
Title: FAR 2023/39 Characterisation and CPUE analysis for scampi (Metanephrops challengeri) in the Bay of Plenty (SCI 1) and Hawke Bay-Wairarapa (SCI 2), 1990–2022
FAR-2023-39-Scampi-Characterisation-And-CPUE-For-SCI1-And-SCI2-1990-To-2022-4347.pdf (9.2 MB)
 Characterisation and CPUE (catch-per-unit-effort) analysis for SCI 1 (Bay of Plenty) and SCI 2 (Hawke Bay-Wairarapa) scampi (Metanephrops challengeri). Scampi live in burrows and variability in emergence rates impact the relationship between CPUE and abundance. SCI 1 index increased from 2016 to 2021. SCI 2 CPUE generally declined from 2015 to 2021. The CPUE indices were accepted by the New Zealand Fisheries Deepwater Working Group as valid for tracking scampi biomass for use in the stock assessment.
Author: McGregor, V.L.;
2023/3809/08/2023
Title: FAR 2023/38 Updated harvest control rule for SBW 6B to allow for years with no acoustic surveys
FAR-2023-38-Southern-Blue-Whiting-Updated-Harvest-Control-Rule-SBW6B-4355.pdf (530.8 kb)
 For southern blue whiting on the Bounty Plateau (SBW 6B), a new Harvest Control Rule, HCR2022, was developed that allowed for consecutive years with no acoustic surveys. HCR2022 replaced the previous HCR which required an acoustic survey every year.
Author: Doonan, I.J.;
2023/3709/08/2023
Title: FAR 2023/37 Acoustic estimates of southern blue whiting from the Campbell Island Rise, August-September 2022 (TAN2210)
FAR-2023-37-Southern-Blue-Whiting-Acoustic-Estimates-SWB6I-Aug-Sep-2022-TAN2210-4385.pdf (9.2 MB)
 The 14th acoustic survey of the southern blue whiting stock (SBW) off Campbell Island (SBW 6I) was carried out onboard RV Tangaroa between 28 August and 23 September 2022. Thirteen (snapshot 1) and ten (snapshot 2) strata were surveyed and twelve research mark identification trawls were completed during the survey. Estimates of biomass of adult SBW were slightly higher than the equivalent estimate from 2019. The average estimate of biomass of juvenile SBW was the highest in the time series.
Author: Escobar-Flores, P.C.; Ladroit, Y.; Holmes, S.;
 26/07/2023
Title: AEBR 317 Candidate species selection for the development of environmental health measures for open ocean salmon aquaculture
AEBR-317-Species-Selection-For-Open-Ocean-Aquaculture-Environmental-Health-Measures-4366-2023.pdf (1.6 MB)
While effects of organic enrichment on inshore, soft-sediment communities are well studied, little is known about how finfish farm-derived impacts will manifest in open ocean environments. This report identifies key species that may be affected by open ocean aquaculture and describes physiological indicators that may provide insight into organism health. This is the first of several project objectives that work toward developing environmental health measures for use in offshore environments.
AEBR: 317;
ISSN: 1179-6480;
ISBN: 978-1-991087-23-2;
AUTHOR: McMullin, R.M.; McGrath, E.C.;
 26/07/2023
Title: AEBR 318 Comparing results of black petrel capture interactions with bottom longlines using different data collection methods
AEBR-318-Data-Collection-Methods-Re-Black-Petrel-Capture-Interactions-With-Longlines-4351-2023.pdf (2.4 MB)
The impact of video monitoring on estimating black petrel bycatch in bottom longline fisheries was assessed. Combining observer and video monitoring data resulted in lower estimated captures compared with using observer data alone. Simulations of different proportions of assessed video footage suggest currently overpredicted estimates of black petrel captures. Also, the analysis suggests that the presence of observers and/or cameras increased fishers’ compliance to report black petrel captures.
AEBR: 318;
ISSN: 1179-6480;
ISBN: 978-1-991087-33-1;
AUTHOR: Meyer, S.; Hickcox R.;
 17/07/2023
Title: FAR 2023/36 Relative abundance, size and age structure, and stock status of blue cod off south Otago in 2022
FAR-2023-36-South-Otago-Blue-Cod-Survey-In-2022-4402.pdf (3.4 MB)
This report describes the results of the random-site potting survey for blue cod (Parapercis colias) off south Otago in March–April 2022. Estimates are provided for population abundance, size and age structure, sex ratio, total mortality (Z), and fishing mortality (F). The 2022 potting survey was the fourth in the south Otago time series, with previous surveys in 2010, 2013, and 2018. The 2010 survey was a dual random-site and fixed-site experimental survey in three of the six strata; and 2013 and 2018 were solely random-site surveys in all six strata.
FAR: 2023/36;
ISSN: 1179-5352;
ISBN: 978-1-991087-27-0;
AUTHOR: Beentjes, M.P.; Fenwick, M.;
 10/07/2023
Title: FAR 2023/35 Inshore trawl survey of Canterbury Bight and Pegasus Bay, May–June 2022 (KAH2204)
FAR-2023-35-Inshore-Trawl-Survey-Canterbury-Bight-And-Pegasus-Bay-May-June-2022-KAH2204-4386.pdf (10.2 MB)
 A bottom trawl survey of the east coast South Island (ECSI) at 10–400 m depths was carried out using R.V. Kaharoa (trip code KAH2204) from 2 May to 23 June 2022. The core (30–400 m) survey was the fourteenth in the winter ECSI inshore time series (1991–1994, 1996, 2007–2009, 2012, 2014, 2016, 2018, 2021, and 2022). Four shallow strata (10–30 m) included in 2007, 2012, 2014, 2016, 2018, and 2021 were again surveyed in 2022 to monitor elephantfish and red gurnard over their full depth range.
FAR: 2023/35;
ISSN: 1179-5352;
ISBN: 978-1-991087-25-6;
AUTHOR: Beentjes, M.P.; MacGibbon, D.J.; Escobar-Flores, P.;
 06/07/2023
Title: FAR 2023/32 Intertidal shellfish monitoring in the northern North Island region, 2022–23
FAR-2023-32-Northern-North-Island-Intertidal-Shellfish-Monitoring-2022-23-4394-2023.pdf (9.7 MB)
This project provides population estimates for cockle Austrovenus stutchburyi and pipi Paphies australis at 12 sites in northern North Island for the 2022–23 fishing year. Also provided are sediment data for Aotea Harbour,Cockle Bay, Eastern Beach, Grahams Beach, Hokianga Harbour, Kawakawa Bay (West), Ōhiwa Harbour, Okoromai Bay, Otūmoetai (Tauranga Harbour), Pataua Estuary, Waiotahe Estuary, Whangamatā Harbour, and Whangapoua Harbour.
FAR: 2023/32;
ISSN: 1179-5352;
ISBN: 978-1-991087-20-1;
AUTHOR: Berkenbusch, K.; Hill-Moana, T.;
 06/07/2023
Title: FAR 2023/33 Monitoring the Kaikōura and Motunau boat-based amateur marine fisheries for blue cod, sea perch, and rock lobster, 2021–22.
FAR-2023-33-Monitoring-Kaikoura-And-Motunau-Boat-Based-Amateur-Marine-Fisheries-2021-22-4392.pdf (2.5 MB)
An onsite creel survey was undertaken in the North Canterbury-Kaikōura region from October 2021 to September 2022 to collect data on the boat-based amateur marine fishery. This survey estimated that 23 184 blue cod (13.1 t), 54 342 sea perch (21.9 t), and 46 771 rock lobster (26.5 t) were harvested in the 12-month period. An additional 13 107 blue cod (7.3 t), 41 475 sea perch (16.1 t), and 3647 rock lobster (2.0 t) were reported in the Amateur Fishing Charter Vessel data over the same period.
FAR: 2023/33;
ISSN: 1179-5352;
ISBN: 978-1-991087-21-8;
AUTHOR: Maggs, J.Q.; Davey, N.K.; Hartill, B.W.;
 06/07/2023
Title: FAR 2023/34 Design for a catch sampling programme survey to estimate the age structure of New Zealand hāpuku (Polyprion oxygeneios).
FAR-2023-34-Catch-Sampling-Programme-Design-To-Estimate-Hapuku-Age-Structure-4393.pdf (1.4 MB)
 A commercial catch sampling design was developed for estimating the age-structure of hāpuku (Polyprion oxygeneios) from the New Zealand bottom longline fishery. Based on the minimum required number of otoliths, current catches, and market conditions, there may be potential for a catch sampling project in HPB 1, HPB 2, HPB 4, and HPB 5, but this would generally incur a high cost and require highly targeted sampling as well as a high degree of cooperation with fishers and licensed fish receivers.
FAR: 2023/34;
ISSN: 1179-5352;
ISBN: 978-1-991087-22-5;
AUTHOR: Maggs, J.Q.; Parsons, D.;
 05/07/2023
Title: AEBR 316 Extent and intensity of bottom contact by commercial trawling and shellfish dredging in New Zealand waters, 1990–2021
AEBR-316-Bottom-Contact-Of-Commercial-Trawl-And-Dredge-Fisheries-New-Zealand-1990-2021-4360-2023.pdf (10.5 MB)
 This report presents the spatial analysis of bottom-contacting effort by commercial trawl vessels and shellfish dredge vessels within the New Zealand Territorial Sea and 200 n. mile Exclusive Economic Zone (EEZ+TS), in waters open to trawling down to 1600 m depths. Fishing years 1989–90 to 2020–21 are covered for deepwater trawl and shellfish dredge fisheries and 2007–08 to 2020–21 for inshore, and 1989–90 to 2020–21 for inshore and deepwater trawling combined.
AEBR: 316;
ISSN: 1179-6480;
ISBN: 978-1-991087-19-5;
AUTHOR: MacGibbon, D.J.; Mules, R.;
2023/3128/06/2023
Title: FAR 2023/31 Commercial catch sampling for species proportion, sex, length, and age of jack mackerels in JMA 7 in the 2020–21 fishing year, with a summary of all available data sets.
FAR-2023-31-Commerical-Catch-Sampling-For-Jack-Mackerels-In-JMA7-202021-4378.pdf (3.6 MB)
Estimates of relative species proportions and catch-at-age for the three jack mackerel (Trachurus) species in the commercial JMA 7 catch for 2020–21 are presented. The available time series of catch-at-age estimates, sex ratios, and species proportions for the JMA 7 catch (2006–07 to 2020–21) are summarised.
FAR: 2023/31;
ISBN: 978-1-991087-11-9;
ISSN: 1179-5352;
AUTHOR: Moore, B.R; Ó Maolagáin, C.; Spong, K.; Saunders, R.J.;
31513/06/2023
Title: AEBR 315 Non-target fish and invertebrate catch and discards in New Zealand arrow squid and scampi trawl fisheries from 2002–03 to 2020–21
AEBR-315-Non-target-Catch-And-Discards-In-Arrow-Squid-And-Scampi-Trawl-Fisheries-4382-2023.pdf (10.3 MB)
Commercial catch and effort data and fisheries observer records of catch and discards by species were used to estimate the rate and level of non-target catch and discards in the scampi and arrow squid trawl fisheries for fishing years 2002–03 to 2020–21. Estimates were made for broad categories of catch and discards including target species, QMS species, non-QMS fish, and non-QMS invertebrate species, and estimates of annual catch were made for several of the major individual non-target species.
AEBR: 315;
ISBN: 978-1-991087-01-0;
ISSN: 1179-6480;
AUTHOR: Anderson, O.F.; Finucci, B.; Edwards, C.T.T.;
31313/06/2023
Title: AEBR 313 Fishery data inputs for the New Zealand Seabird Risk Assessment
AEBR-313-Fishery-Data-Inputs-For-The-New-Zealand-Seabird-Risk-Assessment-4358-2023.pdf (13.5 MB)
This report provides a comprehensive overview of fishery data inputs for assessment of the risk of New Zealand commercial fisheries to New Zealand seabird populations. The risk assessment uses the Spatially Explicit Fisheries Risk Assessment (SEFRA) framework, which requires spatially resolved fishing effort and capture data. These data inputs were extracted from the Protected Species Capture database (version 6; up to and including the 2019/20 fishing year) and prepared for analysis.
AEBR: 313;
ISBN: 978-1-991080-92-9;
ISSN: 1179-6480;
AUTHOR: Edwards, C.T.T.; Peatman, T.; Goad, D.; Webber, D.N.;
31409/06/2023
Title: AEBR 314 Update to the risk assessment for New Zealand seabirds
AEBR-314-Update-To-The-Risk-Assessment-For-New-Zealand-Seabirds-4359-2023.pdf (7.3 MB)
This report details an implementation of the Spatially Explicit Fisheries Risk Assessment (SEFRA) framework to seabirds in the New Zealand Exclusive Economic Zone, attempting to quantify the impact of New Zealand commercial fisheries on New Zealand populations of seventy-one seabird species. As part of the project both the biological and fishery input data have been updated, as well as the structure of the model itself. 
AUTHOR: Edwards, C.T.T.; Peatman, T.; Goad D.; Webber, D.N.;
ISSN: 1179-6480;
ISBN: 978-1-991080-93-6;
AEBR: 314;
31231/05/2023
Title: AEBR 312 Review of biological inputs for the New Zealand Seabird Risk Assessment
AEBR-312-Review-Of-Biological-Inputs-For-New-Zealand-Seabird-Risk-Assessment-4357-2023.pdf (17.3 MB)
This report provides a comprehensive overview of biological inputs for assessment of the risk of New Zealand commercial fisheries to New Zealand seabird populations and was generated as part of Fisheries New Zealand project PRO2019-10. The biological inputs were reviewed and updated where necessary, focusing on high-risk or highly abundant species, and restructured for the updated model formulation. The risk assessment model is described in an accompanying AEBR.
AEBR: 312;
ISSN: 1179-6480;
ISBN: 978-1-991080-91-2;
AUTHOR: Peatman, T.; Edwards, C.T.T.; Goad, D.; Webber, D.N.;
2023/3029/05/2023
Title: FAR 2023/30 Estimates of bycatch and oyster discards from the Foveaux Strait oyster fishery (OYU 5) in February 2022
FAR-2023-30-OYU5-Estimates-Of-Bycatch-And-Oyster-Discards-February-2022-4354.pdf (2.7 MB)
Fishing for oysters in Foveaux Strait does not allow for tow-by-tow reporting of bycatch and oyster discards. These data were estimated from stratified sampling in February 2022. Oyster discards above and below legal size during the 2021 season were relatively low (< 3%). Live bycatch was a small proportion of dredge contents, represented 65 taxa (most of negligible weight). Non-QMS species (86.2%) mostly 2 species, bryozoans-sponges (2.4%), and QMS species (11.4%, mostly SUR and some SSC).
FAR: 2023/30;
ISSN: 1179-5352;
ISBN: 978-1-991080-90-5;
AUTHOR: Michael, K.P.;
2023/2929/05/2023
Title: 2023/29 Developing an operating model and testing management procedures for pāua (Haliotis iris) fisheries in PAU 4
FAR-2023-29-Development-Of-Operating-Model-And-Test-Of-Managment-Procedures-PAU4-4364.pdf (6.7 MB)
This project developed an operating stock assessment model and tested management procedures for pāua quota management area (QMA) PAU 4. Spatial length-based models were conditioned on assumed catch time series, producing stock trajectories and assumed status. Application of control rules led to variable outcomes at the statistical-area scale, but averaged out at a larger scale; trends were stable at the QMA-scale, with a low risk of further declines under trialled harvest control rules.
FAR: 2023/29;
ISSN: 1179-5352;
ISBN: 978-1-991080-89-9;
AUTHOR: Neubauer, P.; Kim, K.;
2023/2829/05/2023
Title: FAR 2023/28 Operating model and management procedure evaluation for pāua (Haliotis iris) fisheries in PAU 3A
FAR-2023-28-Operating-Model-And-Management-Procedure-Evaluation-PAU3A-4373.pdf (5.8 MB)
The present project developed models and tested management options for PAU 3A as the pāua fishery rebuilds following the Kaikōura earthquake. The modelling focused on key uncertainties, including earthquake impacts and recovery, and the developments of recreational catch over time. Depending on the model-fitting strategy and earthquake impacts, tested commercial harvest strategies, combined with recreational harvest scenarios, led to relatively stable, or declining fisheries.
FAR: 2023/28;
ISSN: 1179-5352;
ISBN: 978-1-991080-88-2;
AUTHOR: Neubauer, P.; Kim, K.;
2023/2723/05/2023
Title: FAR 2023/27 Developing an operating model and testing management procedures for pāua (Haliotis iris) fisheries in PAU 3B
FAR-2023-27-Development-Of-Operating-Model-For-PAU3B-fishery-4361.pdf (4.3 MB)
This study attempted to fit stock assessment models and test potential management procedures for pāua (Haliotis iris) stock in quota management area (QMA) PAU 3B. A flat or increasing catch-per-unit-effort (CPUE) prevented the fitting of stock assessment models, leading to the use of CPUE relative to CPUE in other QMAs. This approach suggested a relatively low exploitation rate, high stock status near 60% of unfished biomass, and continued low exploitation from proposed harvest control rules.
FAR: 2023/27;
ISSN: 1179-5352;
ISBN: 978-1-991080-70-7;
AUTHOR: Neubauer, P.;; Kim, K.;
2023/2623/05/2023
Title: FAR 2023/26 Pāua population monitoring in areas affected by the November 2016 Kaikōura earthquake, February 2023 update
FAR-2023-26-Paua-Population-Monitoring-Kaikoura-February-2023-Update-4381.pdf (2.7 MB)
The 2016 Kaikoura earthquake had massive impacts on paua populations, resulting in the 4-year closure of the local paua fishery. Surveys were undertaken over the last five years to monitor paua population recovery. An increase in adult paua abundance and post-earthquake recruitment has been observed across the fishery. These findings and ongoing monitoring will be used to support decisions around future re-opening and management of the fishery.
FAR: 2023/26;
ISSN: 1179-5352;
ISBN: 978-1-991080-69-1;
AUTHOR: McCowan, T.A.; Neubauer, P.;
31119/05/2023
Title: AEBR 311 Development and testing of spatial distribution models for selected shark and turtle species
AEBR-311-Spatial-Distribution-Models-for-Shark-And-Turtle-Species-4377-2023.pdf (3.2 MB)
As part of the development of spatially explicit fisheries risk assessment methodologies for chondrichthyans, spatial distribution modelling methodologies were tested on carpet shark, school shark, great white shark, and green turtle as well as on one simulated dataset. Eight recommendations were made for future distribution models including the need to model a year x space interaction as well as both the probability of presence and catch rate, and the usefulness of simulations. 
AUTHOR: Lyon; Mormede;
ISSN: 1179-6480;
ISBN: 978-1-991080-66-0;
AEBR: 311;
Author: Mormede;
31008/05/2023
Title: AEBR 310 Characterising the shallow, soft-seafloor biomes of northern New Zealand’s Bay of Islands
AEBR-310-Characterisation-Of-Shallow-Soft-Seafloor-Biomes-of-Bay-Of-Islands-4331-2023.pdf (20.1 MB)
Low-relief red-algae turf extends over about 40% of sandy seafloors of ‘Ipipiri Platform’ in eastern Bay of Islands, its spatial extent apparently steady over recent decades. In contrast, the extent of the subtidal seagrass (presently about 5%) has apparently varied substantially. Subtidal seagrass is rare today, and the algal-turf biome is undescribed elsewhere. These bottom-stabilising vegetative biomes are probably the long-term surficial ecological communities of recent geological times.
AEBR: 310;
ISSN: 1179-6480;
ISBN: 978-1-991080-61-5;
AUTHOR: Booth, J.D.; Griffiths, R.; Booth, W.E.; D’Archino, R.; Nelson, W.A.; Kerr, V.C.; Willoughby, R.S.;
2023/2508/05/2023
Title: FAR 2023/25 Annual surveys of the Foveaux Strait oyster (Ostrea chilensis) fishery (OYU 5) and Bonamia exitiosa prevalence, intensity, and disease mortality in February 2022
FAR-2023-25-Foveaux-Strait-OYU5-Oyster-And-Bonamia-Surveys-February-2022-4321.pdf (3.3 MB)
A survey of Foveaux Strait oysters (OYU 5) in February 2022 found commercial-sized, recruit, and pre-recruit oysters decreased 30.5%, 30.4%, and 24.0%, respectively, since 2021. These decreases cannot be explained by landings, disease, or survey variation. Reduced sampling efficiency due to storm driven changes to the seabed is most likely. Small oysters increased 2.3% and spat settlement was high. Bonamia infection was 6.6%, non-fatal infections 1.0%, and summer mortality 5.0%—similar to 2021.
FAR: 2023/25;
ISSN: 1179-5352;
ISBN: 978-1-991080-58-5;
AUTHOR: Michael, K.P.; Bilewitch, J.; Forman, J.; Smith, L.; Moss, G.;
2023/2404/05/2023
Title: FAR 2023/24 Trawl survey of hoki and middle depth species on the Chatham Rise, January 2022 (TAN2201)
FAR-2023-24-Chatham-Rise-Middle-Depths-Trawl-Survey-January-2022-TAN2201-4353.pdf (10.0 MB)
The 27th trawl survey (4 Jan to 3 Feb 2022) on the Chatham Rise in 200–1300 m depths estimated the relative biomass of hoki and 54 other species. Estimated hoki biomass in core (200–800 m) strata was 97 419 t (CV 10.1%), a 9%  increase from 2020. This increase was largely driven by an above average estimate for 2+ (2019 year class) hoki. The biomass of 1+ hoki (2020 year class) was low; the biomass of hoki ages 3+ and older increased by 8%. 
AUTHOR: Stevens; Ballara; Escobar-Flores.; O’Driscoll;
ISSN: 1179-5352;
ISBN: 978-1-991080-57-8;
FAR: 2023/24;
2023/2328/04/2023
Title: FAR 2023/23 Catch-at-age data for southern bluefin tuna in the New Zealand longline fishery, 2019–2021
FAR-2023-23-Catch-At-Age-For-Southern-Buefin-Tuna-2019-2021-4365.pdf (2.4 MB)
The collection of long-term age data is a requirement for countries fishing for Southern Bluefin Tuna.  This report describes the age estimation of otoliths collected from the New Zealand longline and recreational fishing sector between 2019 to 2021.  A total of 238 otoliths were aged during this project. Age estimates ranged from 3–24 years and as in previous years there were few samples less than 4 years of age.   No modal progression of age classes was observed with the age composition data. 
FAR: 2023/23;
ISSN: 1179-5352;
ISBN: 978-1-991080-55-4;
Author: Krusic-Golub; Sutrovic; Barrow;
2032/2224/04/2023
Title: FAR 2023/22 Catch-at-age for barracouta (Thrysites atun) in BAR 4 and BAR 5 and gemfish (Rexea solandri) in SKI 3 and SKI 7 for the 2019–20 and 2020–21 fishing years
FAR-2023-22-Catch-At-Age-Barrcouta-BAR4-BAR5-Gemfish-SKI3-SKI7-2020-2021-4380.pdf (1.0 MB)
Catch-at-age distributions were estimated using data and otoliths from the trawl fishery for barracouta (Thrysites atun, BAR) in BAR 4 and BAR 5 for the 2019–20 and 2020–21 fishing years and for gemfish (Rexea solandri, SKI) in SKI 3 and SKI 7 for the 2020–21 fishing year. Barracouta were mainly ages 2–5. Most of the gemfish in SKI 3 were age 1 with a second mode at ages 4–7, while in SKI 7, they were ages 5–9 with a moderate number of ages 0–2 present.
FAR: 2023/22;
ISSN: 1179-5352;
ISBN: 978-1-991080-51-6;
AUTHOR: Devine, J.A.; Sutton, C.; Hart, A.; Saunders, R.J.;
2023/2117/04/2023
Title: FAR 2023/21 Relative abundance, size and age structure, and stock status of blue cod (Parapercis colias) off north Otago in 2022
FAR-2023-21-Blue-Cod-North-Otago-January-2022-Cod-Potting-Survey-4375.pdf (2.8 MB)
 This report describes results from the random-site blue cod potting survey off north Otago in January 2022. Estimates are provided for population relative abundance, size and age structure, sex ratio, total mortality (Z), and fishing mortality (F). This was the third survey in the random-site survey time series with previous surveys in 2013 and 2018. In addition, 4 random sites were sampled in the proposed marine reserve (Te Umu Koau, D1) that, in part, overlaps with the main survey strata.
AUTHOR: Beentjes, M.P.; Fenwick, M.;
FAR: 2023/21;
ISBN: 978-1-991080-43-1;
ISSN: 1179-5352;
30914/04/2023
Title: AEBR 309 Land-based effects on coastal fisheries and kaimoana and their habitats – a review.
AEBR-309-Land-Based-Effects-On-Coastal-Fisheries-Kaimoana-And-Habitats-4254-2023.pdf (7.3 MB)
Land-based effects on coastal fisheries, kaimoana, and their habitats occur through a diversity of mechanisms. This literature review explores those mechanisms, and likely impacts in New Zealand, with arguably the most important being sedimentation. Background into concerns and interests held by selected iwi and hapū is provided. A potential new emerging issue is Submarine Groundwater Discharge rate reductions to coastal zones. Fundamental knowledge gaps remain, with research suggestions made.
AEBR: 309;
ISSN: 1179-6480;
ISBN: 978-1-991080-42-4;
AUTHOR: Morrison, M.A.; Elliot, S.; Hughes, A.; Kainamu, A.; Williams, E.; Lowe, M.; Lohrer, D.; Needham, H.; Semadeni-Davies, A.;
30806/04/2023
Title: AEBR 308 Local-scale spatial risk assessment of inshore commercial fisheries on Hector’s dolphins
AEBR-308-Local-Scale-Hectors-Dolphin-Inshore-Commercial-Fisheries-Spatial-Risk-Assessment-4328-2023.pdf (4.6 MB)
 The spatially explicit fisheries risk assessment (SEFRA) of Hector’s and Māui dolphins was updated and outputs were reported for Hector’s dolphins in three local-scale areas: the north coast of the South Island, the Kaikōura coast, and the south coast of the South Island. This analysis included a substantial revision of the model used to estimate the spatial distribution of the dolphins, as well as an update of the fisheries data required by the SEFRA model.
ISBN: 978-1-99-001738-4;
ISSN: 1179-5352;
AUTHOR: Webber;
AEBR: 308;
2023/2006/04/2023
Title: FAR 2023/20 Associations between environmental variables and flatfish catch rates in Manukau Harbour and Kaipara Harbour
FAR-2023-20-Environmental-Variables-Associated-With-Flatfish-Catch-Rates-4376.pdf (6.1 MB)
 We examined the influence of water quality at the time of juvenile settlement on subsequent adult flatfish abundance as indexed by commercial catches in the Manukau and Kaipara harbours. Generalised linear models including time-lagged water quality variables indicated an overall negative association between water clarity and flatfish catch, and overall positive association between total phosphorus and flatfish catch in both harbours, suggesting these variables may affect flatfish recruitment.
ISBN: 978-1-991080-35-6;
FAR: 2023/30;
AUTHOR: Moore; McKenzie;
ISSN: 1179-5352;
2023/1906/04/2023
Title: FAR 2023/19 Fishery characterisation and CPUE standardisation for flatfish in FLA 1, 1989–90 to 2020–21
FAR-2023-19-Flatfish-FLA1-Characterisation-And-CPUE-For-198990-To-202021-4344.pdf (21.1 MB)
 This report summarises trends in the FLA 1 fishery and updates the standardised CPUE indices for flatfish caught in six set net fisheries between 1989–90 and 2020–21. Long-term declines in standardised CPUE are evident in the Manukau and Kaipara harbours. The Hauraki Gulf index shows an overall declining trend with periodic increases to 2017 and has been generally stable since. Variable trends are evident in the remaining three areas, although it is unclear if trends are indicative of abundance.
AUTHOR: Bian; McKenzie;
FAR: 2023/19;
ISSN: 1179-5352;
ISBN: 978-1-991080-34-9;
2023/1829/03/2023
Title: FAR 2023/18 Quantifying effects of reporting changes for pāua (Haliotis iris) catch-per-unit-effort
FAR-2023-18-Effects-Of-Reporting-Changes-For-Paua-CPUE-4315.pdf (3.1 MB)
The present study assessed potential differences in reporting patterns of pāua fishing effort, following the recent change from Pāua Catch Effort Landing Return forms to an electronic reporting system. Effort data were analysed over a comparable three-year time period pre- and post-reporting change. The findings of this analysis indicate that changes in effort reporting had a limited impact on pāua catch-per-unit-effort indices across quota management areas.
FAR: 2023/18;
AUTHOR: Neubauer;
ISBN: 978-1-991080-27-1;
ISSN: 1179-5352;
2023/1729/03/2023
Title: FAR 2023/17 The 2022 stock assessment of pāua (Haliotis iris) for PAU 7
FAR-2023-17-Paua-PAU7-2022-Stock-Assessment-4311.pdf (2.9 MB)
 This updated stock assessment for pāua (Haliotis iris) in quota management area PAU 7 estimated that the 2020 status in the Cook Strait area was still below target. Nevertheless, projected biomass indicated strong signs of rebuilding in this area. In other areas, including the Northern Faces of Marlborough Sounds and D'Urville Island, biomass levels are likely to be low; however, no data are available to explain the lack of recovery. The models for these areas were, therefore, not accepted.
FAR: 2023/17;
ISSN: 1179-5352;
ISBN: 978-1-991080-26-4;
AUTHOR: Neubauer;
2023/1623/03/2023
Title: FAR 2023/16 Fishery characterisation and catch per unit effort for red gurnard in GUR 1 to 2020/21, with an exploration of stock structure in New Zealand waters.
FAR-2023-16-Red-Gurnard-Characterisation-And-CPUE-GUR1-To-202021-4369.pdf (5.4 MB)
In BPLE the standardised CPUE index increased from 1995/96 to 2000/01, then fluctuated without trend, and in 2020/21 was about twice the value in 1995/96. For ENHG the index had peaks in 2004/05 and 2015/16, and in 2020/21 was 81% of the value in 1995/96. For WCNI the standardised index increased in an irregular manner since 1995/96, and in 2020/21 was 27% more than at the start of the series.
FAR: 2023/16;
ISSN: 1179-5352;
ISBN: 978-1-991080-20-2; 978-1-991080-20-2;
AUTHOR: McKenzie, A.; Moore, B.R.;
30715/03/2023
Title: AEBR 307 Grooming and preparation of the Yellow-eyed Penguin Database
AEBR-307-Grooming-And-Preparation-Of-The-Yellow-Eyed-Penguin-Database-4326-2023.pdf (4.9 MB)
The Yellow-eyed Penguin Database (YEPDB), containing monitoring, marking, post-mortem, and captivity data for yellow-eyed penguins in New Zealand from 1971 to 2022, was groomed following a 5-step scripted and manual cleaning workflow. Original records, often in paper form, were digitally archived in a Microsoft SharePoint Data Management System (DMS), along with the cleaned tables, master lists, ancillary tables, database metadata, and 29 lookup tables.
AEBR: 307;
ISSN: 1179-6480;
ISBN: 978-1-991080-06-6;
AUTHOR: Hickcox, R.P.; Young, M.J.; MacKenzie, D.I.;
2023/1514/03/2023
Title: FAR 2023/15 Characterisation and CPUE for the gemfish fishery in SKI 1 and SKI 2 from 1990 to 2022
FAR-2023-15-Gemfish-Characterisation-And-CPUE-SKI1-SKI2-From-1990-To-2022-4340.pdf (10.4 MB)
New abundance indices for the northern gemfish stock in SKI 1 and SKI 2 have been developed. The main index for adult fish is based on catch-per-unit-effort from the gemfish and hoki target trawl fishery focused in the Bay of Plenty. A tarakihi-target index monitors juvenile fish. Following a period of high recruitment beginning in 2016, the northern stock has increased substantially and was assessed to be above the target reference point in 2021. Abundance has increased further in 2022. 
FAR: 2023/15;
ISBN: 978-1-991080-05-9;
ISSN: 1179-5352;
AUTHOR: Middleton; Neubauer; Thompson;
30610/03/2023
Title: AEBR 306 Exploring the use of spatial decision-support tools to identify trawl corridors in the Hauraki Gulf Marine Park.
AEBR-306-Spatial-Decision-Support-Tools-For-Trawl-Corridors-Hauraki-Gulf-4341-2023.pdf (25.2 MB)
This project explores the use of decision-support tools to identify trawl corridors in the Hauraki Gulf Marine Park (HGMP). Biogenic habitat spatial distributions were modelled for twenty functional groups and scenarios developed using decision-support tools were presented at four advisory group workshops. The results can be used to inform spatial management processes in the HGMP.
AEBR: 306;
ISSN: 1179-6480;
ISBN: 978-1-991080-02-8;
AUTHOR: Bennion, M.; Brough, T.; Leunissen, E.; Morrison, M.; Hillman, J.; Hewitt, J.E.; Rowden, A.A.; Lundquist, C.J.;
2023/1408/03/2023
Title: FAR 2023/14 Stock assessment of ling (Genypterus blacodes) on the Chatham Rise (LIN3&4) for the 2021–22 fishing year
FAR-2023-14-Chatham-Rise-Ling-Stock-Assessment-LIN3-LIN4-202122-4336.pdf (4.2 MB)
This report summarises a stock assessment of ling on the Chatham Rise (LIN 3&4) for the 2021–22 fishing year. The main index of abundance was the trawl survey series as the commercial longline standardised catch per unit effort series was not deemed suitable. The initial biomass was similar to the previous assessment at about 110 040 t; stock status in 2021 was estimated at 56% B0. Projected stock status in 2027 was between 46% and 59% of B0 depending on recruitment and catch assumptions.
FAR: 2023/14;
ISSN: 1179-5352;
ISBN: 978-1-99-106298-7;
AUTHOR: Mormede, S; Dunn, A.; Webber, D.N.;
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