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This site contains documents relating to research from 1988 to the current date. Research was funded by MPI and its predecessor agencies. Expand the filter and select the relevant search parameters to search for documents.
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MOF1999-01C01/05/2000
Title: Hoki ageing: recommendation of which data to routinely record for hoki otoliths
MOF1999-01C Hoki ageing.pdf (1.0 MB)
Hoki ageing: recommendation of which data to routinely record for hoki otoliths
Author: Ballara S.L.; Cordue P.L.; Horn P.L.;
MOF1999-01C: .;
ResearchField: Ageing;
ScienceStock: Hoki;
Species: HOK;
Stock: HOK1;
MID2003-0301/02/2005
Title: Commercial catch sampling for length and age of hoki and ling in Cook Strait in the winter 2004 hoki spawning fishery
MID2003-03 Hoki Ling Cook Strait 2004 length age winter Objective 1 2 final.pdf (723.9 kb)
Commercial catch sampling for length and age of hoki and ling in Cook Strait in the winter 2004 hoki spawning fishery. Objectives 1 and 2
Author: Horn P.L.; Phillips N.L.;
FishingMethod: Trawl;
MID2003-03: Objective 1; Objective 2;
ResearchField: Catch sampling;
ScienceStock: Middle depths;
Species: HOK; LIN;
Stock: HOK1; LIN2;
MID2003-0201/07/2004
Title: Comparison of estimated age distributions of WCSI hoki catches, derived using old and new ageing protocols, and catch-at-age data for ling.
MID2003-02 Hoki, Ling Objectives 4,6 Final_02.pdf (385.3 kb)
Comparison of estimated age distributions of WCSI hoki catches, derived using old and new ageing protocols, and catch-at-age data for ling. Objectives 4 and 6
Author: Davey N.K.; Horn P.L.; Phillips N.L.;
FishingMethod: Trawl;
MID2003-02: Objective 4; Objective 6;
ResearchField: Ageing;
ScienceStock: Middle depths;
Species: HOK; LIN;
Stock: HOK1;
MDT2003-0101/06/2006
Title: Estimating the proportion of female hoki on the Southern Plateau which spawn each year by microscopic examination of gonad samples
MDT2003-01 Female Hoki Southern Plateau spawn gonad samples Objective 6 final.pdf (9.3 MB)
Estimating the proportion of female hoki on the Southern Plateau which spawn each year by microscopic examination of gonad samples. Objective 6
Author: Grimes P.; O'Driscoll R.;
FishingMethod: Trawl;
MDT2003-01: Objective 6;
ScienceStock: Middle depth;
Species: HOK;
Stock: HOK1;
MDT2000-0101/07/2001
Title: Trawl survey of middle depth species in the Southland and Sub-Antarctic areas, November-December 2000 (TAN0012)
MDT2000-01 Survey Middle depth species Southland and Sub-Antarctic Objective 1,2 Final.pdf (2.4 MB)
Trawl survey of middle depth species in the Southland and Sub-Antarctic areas, November-December 2000 (TAN0012). Objectives 1 and 2
Author: Bagley N.W.; Bull B.; O'Driscoll R.L.;
FishingMethod: Trawl;
MDT2000-01: Objective 1; Objective 2;
ResearchField: ; Trawl survey;
ScienceStock: Middle depth;
Species: HAK; HOK; LIN;
Stock: HAK1; HOK1; LIN5; LIN6;
MDT1999-0101/09/2000
Title: Review of summer and autumn trawl survey time series from the Southland and Sub-Antarctic area 1991-1998
MDT1999-01 Survey Ling and Hake Southern Plateau Objective 1 Final.pdf (1.1 MB)
Review of summer and autumn trawl survey time series from the Southland and Sub-Antarctic area 1991-1998. Objective 1
Author: Bagley N.W.; O'Driscoll R.L.;
FishingMethod: Trawl;
MDT1999-01: Objective 1;
ResearchField: Trawl survey;
ScienceStock: Middle depth;
Species: HAK; HOK; LIN;
HOK980301/08/2000
Title: Estimation of acoustic target strength of hoki using in situ data and swimbladder modelling
HOK19803 Hoki target stregth swimbladder final Objective 2.pdf (1.6 MB)
Estimation of acoustic target strength of hoki using in situ data and swimbladder modelling. Objective 2
Author: Cordue P.; Grimes P.; Macaulay G.;
HOK9803: Objective 2;
ResearchField: Acoustic; swimbladder modelling;
ScienceStock: Hoki;
Species: HOK;
Stock: HOK1;
HOK980201/09/1999
Title: Trawl survey of hoki and middle depth species on the Chatham Rise, January 1999
HOK9802 Survey Hoiki Chatham Rise 1999 final Objective 1,2.pdf (2.9 MB)
Trawl survey of hoki and middle depth species on the Chatham Rise, January 1999. Objectives 1 and 2
Author: Bagley N.W.; Livingston M.E.;
FishingMethod: Trawl;
HOK9802: Objective 1; Objective 2;
ResearchField: Trawl survey;
ScienceStock: Middle depth;
Species: HAK; HOK; LIN;
Stock: HOK1;
HOK970301/05/1999
Title: Acoustic target strength of hoki
HOK9703 Hoki acoustic target strength final Objective 2.pdf (1.0 MB)
Acoustic target strength of hoki. Objective 2
Author: Bradford E.;
HOK9703: Objective 2;
ResearchField: Acoustics;
ScienceStock: Hoki;
Species: HOK;
Stock: HOK1;
HOK2000-0101/11/2002
Title: Migration patterns during the life-cycle of hoki (Macruronus novaezelandiae): an analysis of trawl survey data in New Zealand waters 1991-2002
HOK2000-01 Survey Hoki NZ Objective 6 Final.pdf (2.6 MB)
Migration patterns during the life-cycle of hoki (Macruronus novaezelandiae): an analysis of trawl survey data in New Zealand waters 1991-2002. Objective 6
Author: Bull B.; Livingston M.E.; Stevens D.W.;
FishingMethod: Trawl;
HOK2000-01: Objective 6;
ResearchField: Trawl survey;
ScienceStock: Hoki;
Species: HOK;
Stock: HOK1;
HOK1999-0501/04/2001
Title: Evaluation of meristic characters for determining hoki stock relationships
HOK1999-05 Hoki Objective 1 Final.pdf (596.4 kb)
Evaluation of meristic characters for determining hoki stock relationships. Objective 1
Author: Bull B.; McVeagh M.; Smith P.;
FMA: FMA1;
HOK1999-05: Objective 1;
ResearchField: meristic characters; Stock relationships;
ScienceStock: Hoki;
Species: HOK;
Stock: HOK1;
HOK1999-0401/04/2001
Title: Catch sampling from the commercial Cook Strait hoki catch in winter 2000
HOK1999-04 Hoki Cook Strait Objective 1 Final.pdf (675.7 kb)
Catch sampling from the commercial Cook Strait hoki catch in winter 2000. Objective 1
Author: Ballara S.L.; O'Driscoll R.L.;
HOK1999-04: Objective 1;
ResearchField: Catch sampling;
ScienceStock: Hoki;
Species: HOK;
HOK1999-0401/06/2001
Title: Catches, size and age structure of the 1999-2000 hoki fishery
HOK1999-04 Hoki Objective 2 Final.pdf (1.6 MB)
Catches, size and age structure of the 1999-2000 hoki fishery
Author: Ballara S.L.; Kendrick T.H.; Livingston M.E.; O'Driscoll R.L.;
HOK1999-04: Objective 3;
HOK2000-04: Objective 2;
ResearchField: Catch sampling;
ScienceStock: Hoki;
Species: HOK;
HOK1999-0301/08/2001
Title: Estimates of the target strength of hoki
HOK1999-03 Hoki Objective 3 Final.pdf (440.5 kb)
Estimates of the target strength of hoki

HOK1999-03 Hoki Objective 3 Final
Author: Macaulay G.;
FishingMethod: Trawl;
FMA: ; FAM2; FAM3; FAM9; FMA1; FMA10; FMA4; FMA5; FMA6; FMA7; FMA8;
HOK1999-03: Objective 3;
ResearchField: Acoustics; Biomass; Stock assessment;
ScienceStock: Middle Depths;
Species: HOK;
Stock: HOK1; HOK1E; HOK1W;
HOK1999-0301/08/2001
Title: Estimates of the target strength of hoki
HOK1999-03 Hoki Objective 3 Final.pdf (440.5 kb)
Estimates of the target strength of hoki. Objective 3
Author: Macaulay G.;
FMA: FMA1;
HOK1999-03: Objective 3;
ResearchField: Acoustics;
ScienceStock: Hoki;
Species: HOK;
Stock: HOK1;
HOK1999-0201/12/2000
Title: A review of hoki and middle depth trawl surveys of the Chatham Rise, January 1992-2001
HOK1999-02 Survey Hoki Chatham Rise Objective 4 Final.pdf (4.4 MB)
A review of hoki and middle depth trawl surveys of the Chatham Rise, January 1992-2001

HOK1999-02 Survey Hoki Chatham Rise Objective 4 Final
Author: Bagley N.W.; Bull B.; Livingston M.E.; Stevens D.W.;
FishingMethod: trawl;
FMA: ; FAM2; FAM3; FAM9; FMA1; FMA10; FMA4; FMA5; FMA6; FMA7; FMA8;
HOK1999-02: Objective 4;
ResearchField: Stock assessment; Trawl survey;
ScienceStock: Hoki; Middle depths;
Species: HOK;
Stock: HOK1; HOK1E; HOK1W;
HOK1999-0201/12/2000
Title: Estimation of hoki and middle depth fish abundance on the Chatham Rise using trawl surveys
HOK1999-02 Survey Hoki Chatham Rise Objectives 1, 2 Final.pdf (2.0 MB)
Estimation of hoki and middle depth fish abundance on the Chatham Rise using trawl surveys


HOK1999-02 Survey Hoki Chatham Rise Objectives 1, 2 Final
Author: Bagley N.W.; Livingston M.E.; Stevens D.;
FishingMethod: Trawl;
FMA: ; FAM2; FAM3; FAM9; FMA1; FMA10; FMA4; FMA5; FMA6; FMA7; FMA8;
ResearchField: Ecosystem effects, function or models; Trawl survey;
ScienceStock: ; Hoki; Middle depths;
Species: HOK;
Stock: HOK1; HOK1E; HOK1W;
HOK1999-0101/12/2000
Title: Links between climate and the year class strength of hoki: an update
HOK1999-01 Hoki Objective 1 Final.pdf (830.9 kb)
Links between climate and the year class strength of hoki: an update

HOK1999-01 Hoki Objective 1 Final
Author: Bull B.; Livingston M.E.;
FishingMethod: Trawl;
FMA: ; FAM2; FAM3; FAM9; FMA1; FMA10; FMA4; FMA5; FMA6; FMA7; FMA8;
HOK1999-01: Objective 1;
ResearchField: Life-history characteristics; population modelling; Stock assessment;
ScienceStock: Hoki; inshore;
Species: HOK;
Stock: HOK1; HOK1E; HOK1W;
HOK1999-0101/11/2001
Title: The complexity of the hoki stock assessment model
HOK1999-01 Hoki Objective 2 Final.pdf (533.7 kb)
The complexity of the hoki stock assessment model

HOK1999-01 Hoki Objective 2 Final
Author: Bull B.;
FishingMethod: Trawl; trawling;
FMA: ; FAM2; FAM3; FAM9; FMA1; FMA10; FMA4; FMA5; FMA6; FMA7; FMA8;
ResearchField: model assesement; stock assesment;
ScienceStock: ; Hoki Working Group; Inshore;
Species: HOK;
Stock: HOK1; HOK1E; HOK1W;
ENV2002-0701/09/2004
Title: A sampling programme to construct and quantify fish food-webs on the Chatham Rise
FINAL_FRR2002_07_Livingston_Pinkerton.pdf (610.3 kb)
A sampling programme to construct and quantify fish food-webs on the Chatham Rise

ENV2002-07 Chatham Rise fish foodwebs sampling quantify Objective 1 final.pdf
Author: Livingston M.; Pinkerton M.;
FishingMethod: Middle Depth trawl;
FMA: ; FMA3; FMA4;
ResearchField: Trophic structure;
ScienceStock: Middle depths;
Species: ; BAR: WWA; BOE; BYX; GSH; GSP; GSP; HAK; HOK; LDO; LIN; OEO; SPD; SPE; STA; SWA;
978-1-77665-843-514/06/2018
Title: FAR 2018/14 - Stock assessments of hoki, hake and ling using alternative catch histories.
FAR-2018-14-HOK-HAK-LIN-Alternative-Catch-Histories.pdf (6.9 MB)
This report presents additional assessments of hoki, hake and ling stocks using alternative catch histories. The assessments are for both hoki stocks (HOK 1 east, HOK 1 west), the three hake biological stocks (HAK 1 Sub-Antarctic, HAK 4 Chatham Rise, HAK 7 west coast South Island), and the three largest ling biological stocks (LIN 3&4 Chatham Rise, LIN 5&6 Sub-Antarctic, LIN 7 WCSI). Estimates of current stock status generally differed little from the base case model assessments.
Species: HOK; HAK; LIN;
Author: Horn P.; Dunn M.; McKenzie A.;
978-1-77665-841-114/06/2018
Title: FAR 2018-12 - Acoustic survey of spawning hoki in Cook Strait during winter 2017
FAR-2018-12-Acoustic-biomass-estimates-Cook-Strait-HOK-2017.pdf (5.2 MB)
An acoustic survey of spawning hoki abundance in Cook Strait was carried out from the research vessel Ikatere from 25 July to 27 August 2017 (IKA1701). The average abundance estimate over the six snapshots was 102 000 t, with a total CV of 36%. This was half of the equivalent estimate from 2015. Ikatere is not capable of mark identification trawling, so the only biological data available were from at-sea observers and land-based sampling of the commercial catch.
Species: HOK;
Author: O’Driscoll R.; Escobar-Flores P.;
978-1-77665-606-623/06/2017
Title: Catches, size, and age structure of the 2015–16 hoki fishery, and a summary of input data used for the 2017 stock assessment.
FAR-2017-31-Hoki-Catches-and-Input-Data.pdf (7.4 MB)
 Catch statistics and length and age data of hoki taken from the 2015–16 commercial fisheries are summarised and compared with data from previous years. Biomass indices from research surveys and results from other research on hoki in the last year are also briefly described. These data were used in the hoki stock assessment carried out in 2017 (published separately).
Author: Ballara, S.L.; O’Driscoll, R.L.;
FishingMethod: Trawl;
ScienceStock: HOK;
Species: HOK;
Stock: HOK1;
978-1-77665-525-027/03/2017
Title: FAR 2017/13 Age determination protocol for hoki (Macruronus novaezelandiae).
FAR-2017-13-Hoki-age-determination-protocol.pdf (1.3 MB)
The age determination protocol for hoki (Macruronus novaezelandiae) is described. Digital image examples of otolith reference set preparations are presented and fully illustrate the zone interpretation used in determining fish age for hoki. Associated difficulties and idiosyncrasies related to ageing prepared otoliths are also described.
Author: Horn, P.L.; Sutton, C.P.;
FishingMethod: Trawl;
ResearchField: ageing; Hoki; Macruronus novaezealandiae; otoliths; prepared otoliths; zone preparation;
ScienceStock: Deepwater;
Species: Hoki; Macruronus novaezealandiae;
978-1-77665-511-317/03/2017
Title: FAR 2017/11 Assessment of hoki (Macruronus novaezelandiae) in 2016.
FAR-2017-11-Hoki-stock-assessment-2016.pdf (2.3 MB)
The western stock was estimated to be 40–79% B0 and the eastern stock 44–75% B0 (values are 95% CIs for the base case). Under current catches the eastern and western biomasses are likely to increase slightly over the next five years.
Author: McKenzie, A.;
FishingMethod: Trawling;
ResearchField: biomass; hoki; trawling; western stock;
ScienceStock: Deepwater;
Species: Hoki;
978-1-77665-509-024/05/2017
Title: Fish and invertebrate bycatch in New Zealand deepwater fisheries from 1990–91 until 2013–14.
AEBR-181-Bycatch-in-deepwater-fisheries.pdf (9.7 MB)
This report provides the fourth iteration of the plan to provide a list of all fish and invertebrate bycatch species in New Zealand deepwater fisheries, with estimates of annual catch weights, that can be relatively rapidly produced and regularly updated.
ScienceStock: deepwater;
Species: HOK; HAK; LIN; SQU;
Author: Anderson O.;
978-1-77665-493-2 07/04/2017
Title: FAR 2017/08 Trawl survey of hoki and middle depth species on the Chatham Rise, January 2016 (TAN1601).
FAR-2017-08-Hoki-trawl-survey-TAN1601.pdf (8.0 MB)
The 24th Chatham Rise trawl survey was carried out 3 January to 2 February 2016. In 2016 the survey area was successfully extended to cover to 800–1300 m depths around the entire Rise. In total 139 stations were completed - 84 core (200–800 m) phase 1, 9 core phase 2 and 46 deep (800–1300 m). The estimates of relative core biomass were hoki 114 514 t (CV 14.2%), hake 1299 t (CV 18.5%) and ling 10 201 t (CV 7.2%). The deep strata provide relative biomass indices for a range of deepwater sharks and other species associated with orange roughy and oreo fisheries. Acoustic indices of mesopelagic fish were higher than in 2014.
Author: Ballara, S.L.; Ladroit, Y.; O’Driscoll, R.L.; Stevens, D.W.;
FishingMethod: Trawl survey;
ResearchField: Chatham Rise; Hoki; middle depth species; trawl survey;
ScienceStock: Deepwater;
Species: Hoki;
978-1-77665-493-2 03/05/2017
Title: FAR 2017/08 Trawl survey of hoki and middle depth species on the Chatham Rise, January 2016 (TAN1601).
FAR-2017-08-Hoki-trawl-survey-TAN1601.pdf (7.1 MB)
The 24th Chatham Rise trawl survey was carried out 3 January to 2 February 2016. In 2016 the survey area was successfully extended to cover to 800–1300 m depths around the entire Rise. In total 139 stations were completed - 84 core (200–800 m) phase 1, 9 core phase 2 and 46 deep (800–1300 m). The estimates of relative core biomass were hoki 114 514 t (CV 14.2%), hake 1299 t (CV 18.5%) and ling 10 201 t (CV 7.2%). The deep strata provide relative biomass indices for a range of deepwater sharks and other species associated with orange roughy and oreo fisheries. Acoustic indices of mesopelagic fish were higher than in 2014.
Author: Ballara, S.L.; Ladroit, Y.; O’Driscoll, R.L.; Stevens, D.W.;
FishingMethod: Trawl;
ResearchField: 2016; Chatham Rise; hoki; middle depths; trawl;
ScienceStock: Deepwater;
Species: Hoki;
978-1-77665-342-308/08/2016
Title: FAR 2016/ 44 Acoustic survey of spawning hoki in Cook Strait during winter 2015 and update of acoustic q priors for hoki stock assessment modelling.
FAR-2016-44-hoki-acoustic-Cook-Strait.pdf (2.7 MB)
An acoustic survey of spawning hoki abundance in Cook Strait was carried out from two industry vessels from 24 July to 2 September 2015. The average estimate of hoki abundance from five accepted snapshots (204 000 t, CV 33%) was 21% higher than the equivalent estimate from 2013. Priors on the acoustic survey proportionality constant q were re-evaluated for both the Cook Strait and west coast South Island survey time-series to reflect recent revisions to hoki target strength estimates.
Author: Dunford, A.J.: MacGibbon, D.J.; Ladroit, Y.; O’Driscoll, R.L.;
FishingMethod: Trawl;
ResearchField: abundance; acoustic survey; Hokil; q;
ScienceStock: Deepwater;
Species: Hoki;
978-1-77665-314-0 14/07/2016
Title: FAR 2016/ 40 Catches, size, and age structure of the 2014–15 hoki fishery, and a summary of input data used for the 2016 stock assessment.
FAR-2016-40-HOK-input-data.pdf (19.0 MB)
Catch statistics and length and age data of hoki from commercial fisheries during the 2014–15 fishing year are summarised and compared with those from previous years. Biomass indices from research surveys and results from other research on hoki in the last year are also briefly described. These data are used in the hoki stock assessment carried out in 2016 (published separately).
Author: Ballara, S.L.; O’Driscoll, R.L.;
FishingMethod: Trawl;
ResearchField: age data; biomass indices; commercial; length data; research survey;
ScienceStock: Deepwater;
Species: Hoki;
978-1-77665-151-114/03/2016
Title: FAR 2016/01 Assessment of hoki (Macruronus novaezelandiae) in 2015.
FAR-2016-01-hoki-assessment-2015.pdf (2.3 MB)
The western stock is estimated to be 36–69% B0 and the eastern stock 43–78% B0 (values are 95% CIs for the base case). For the western stock recruitment has been near or above average since 2001, except in 2010, 2012 and 2013 when it was likely to have been below average (although this is estimated with high uncertainty). In projections the eastern and western biomasses are likely to remain stable or decline slightly over the next five years.
Author: McKenzie, A.;
FishingMethod: trawling;
ResearchField: biomass indices; CASAL; proportion spawning; proportions-at-ag; proportions-at-sex; stock status;
ScienceStock: Deepwater;
Species: Hoki; Macruronus novaezelandiae;
978-1-77665-059-028/09/2015
Title: FAR 2015/57 Catches, size, and age structure of the 2013–14 hoki fishery, and a summary of input data used for the 2015 stock assessment.
FAR-2015-57-HOK-data-2015-with-erratum.pdf (7.0 MB)
Catch statistics and length and age data of hoki from commercial fisheries during the 2013–14 fishing year are summarised and compared with those from previous years. Biomass indices from research surveys and results from other research on hoki in the last year are also briefly described. Details of model structure, results, and yield estimates from the hoki stock assessment carried out in 2015 are published separately.
Author: Ballara, S.L.; O’Driscoll, R.L.;
FishingMethod: ; trawl survey;
ResearchField: age structure; length structure; research survey; Unstandardised catch and effort;
ScienceStock: Deepwater;
Species: hoki; Macruronus novaezelandiae;
978-1-77665-042-2 01/12/2015
Title: AEBR 158 Fish and invertebrate bycatch in New Zealand deepwater fisheries from 1990–91 until 2012–13.
AEBR-158-deepwater-bycatch-discards-with-erratum.pdf (10.2 MB)
This report provides estimates of annual levels of individual fish and invertebrate species bycatch in eight fisheries across nine New Zealand Tier-1 deepwater species, for 1990–91 to 2012–13. Commercial catch-effort data were used to scale up rates calculated from the observed fishery. Summary tables detail the annual bycatch and bycatch trend for each species or species group.
Author: Ballara, S.L.;
ResearchField: bycatch; Commercial catch-effort data; deepwater fisheries; obsever records;
ScienceStock: Aquatic Environment working group;
Species: arrow squid; hake; hoki; jack mackeral; ling; orabnge roughy; oreo; scampi; southern blue whiting;
978-0-478-43722-501/09/2014
Title: FAR 2014/41 Catches, size, and age structure of the 2012–13 hoki fishery, and a summary of input data used for the 2014 stock assessment.
FAR_2014_41_2782_DEE2010-02HOKC Obj 2 CS 8 and MID2010-01D Obj 7 CS 11 RR 2D.pdf (2.8 MB)
Catch statistics and length and age structure data of hoki from commercial sampling during the 2012–13 fishing year are summarised. Length frequency and catch-at-age data from spawning and non-spawning fisheries are compared with those from previous years. Biomass indices from research surveys and results from other research on hoki in the last year are also briefly described. Details of model structure, results, and yield estimates from the hoki stock assessment carried out in 2013 are published separately.
Author: Ballara, S.L.; O’Driscoll, R.L.;
ResearchField: Catch statisitcs; length and age structure;
ScienceStock: HOK;
Species: Hoki;
978-0-478-42365-524/02/2014
Title: FAR 2014/12 Trawl survey of hoki and middle-depth species in the Southland and Sub-Antarctic areas, November–December 2012 (TAN1215).
FAR_2014_12_2724_MDT2010-01A Obj 1-4; CS4; RR4A.pdf (5.0 MB)
Results from the fifteenth Tangaroa summer trawl survey of the Southland and Sub-Antarctic areas carried out from 25 November to 23 December 2012 are given in this report. Biomass estimates and population scaled length frequencies are presented for 12 key species. Catch rate data are presented for hoki, hake and ling and include plots for age classes of hoki. Comparisons with earlier surveys are made. Acoustic data collected on the survey are also presented.
Author: Bagley, N.W.; O’Driscoll, R.L.; Oeffner, J.;
FishingMethod: Trawl;
Species: Hoki;
Stock: HOK;
978-0-478-42358-7 10/02/2014
Title: FAR 2014/09 Trawl and acoustic survey of hoki and middle depth fish
FAR_2014_09_2668_HOK2010-04B NIW RR2, CS5.pdf (3.7 MB)
This report describes results from the combined trawl and acoustic survey of the west coast South Island (WCSI), carried out from 20 July to 19 August 2012. The acoustic abundance index for spawning hoki in 2012 was 4% higher than the equivalent index from 2000 and slightly above the long-term average of the time-series. This survey was also the second in a new time series of trawl estimates for middle depth species from the WCSI, and trawl abundance indices are presented for 28 species.
Author: Bagley, N.W.; Ballara, S.L.; O’Driscoll, R.L.; Oeffner, J.;
Species: Hoki;
Stock: HOK;
978-0-478-42354-910/02/2014
Title: FAR 2014/05 Catches size and age structure of the 2011-12 hoki fishery
FAR_2014_05_2702_DEE2010-02HOK and MID 2010-01C Obj 1 and 2, CS5, RR2Bpdf.pdf (2.0 MB)
Catch statistics and length and age structure data of hoki from commercial sampling during the 2011–12 fishing year are summarised. Length frequency and catch-at-age data from spawning and non-spawning fisheries are compared with those from previous years. Biomass indices from research surveys and results from other research on hoki in the last year are also briefly described. Details of model structure, results, and yield estimates from the hoki stock assessment carried out in 2012 are published separately.
Author: Ballara, S.L.; O’Driscoll, R.L.;
Species: hoki;
Stock: HOK;
978-0-478-42336-531/01/2014
Title: FAR 2014/02 Trawl survey of hoki and middle depth species on the Chatham Rise, January 2013
FAR_2014_02_HOK2010-05B Obj 4B; CS 9.pdf (8.5 MB)
The 22nd annual Chatham Rise trawl survey was carried out 2–26 January 2013. In total 123 stations were completed - 89 core (200–800 m) phase 1, 2 core phase 2 and 32 deep (800–1300 m). The estimates of relative core biomass were hoki 124 112 t (c.v. 15.3%), hake 1793 t (c.v. 15.3%) and ling 8714 t (c.v. 10.1%). Estimated biomass of orange roughy in core and northern deep strata was 2 776 t (c.v. 32.4%). Acoustic indices of mesopelagic fish were lower than in 2012.
Author: Ballara, S.L.; Horn, P.L.; O’Driscoll, R.L.; Oeffner, J.; Stevens, D.W.;
Species: Hoki; Middle depth species;
Stock: HOK;
978-0-478-41415-812/07/2013
Title: Trawl survey of hoki and middle depth species on the ChathamRise, January 2012 (TAN1201).
FAR_2013_34_2605_HOK2010-05A NIW_Obj1-5, CS4.pdf (6.9 MB)
The 21st annual Chatham Rise trawl survey was carried out 2–28 January 2012. In total 134 stations were completed - 90 core (200–800 m) phase 1, 10 core phase 2 and 34 deep (800–1300 m). The estimates of relative core biomass were hoki 87 505 t (c.v. 9.8%), hake 1292 t (c.v. 14.7%) and ling 8098 t (c.v. 13.8%). Estimated biomass of orange roughy in core and northern deep strata was 5202 t (c.v. 26.7%). Acoustic indices of mesopelagic fish had increased from 2011 and were the highest since 2009.
Author: Ballara, S.L.; Dunn, M.R.; Horn, P.L.; O'Driscoll, R.L.; Stevens, D.W.;
FishingMethod: trawl;
ResearchField: accoustic; Chatham Rise; estimated biomass; trawl survey;
ScienceStock: Deepwater;
Species: Hoki; Middle depths species;
Stock: HOK;
978-0-478-41400-408/07/2013
Title: Assessment of hoki (Macruronus novaezelandiae) in 2012.
FAR_2013_27_2626_DEE2010-02HOKA, Obj.1, CS2.pdf (948.9 kb)
 An updated assessment is presented for hoki. New biomass indices were: Chatham Rise trawl survey January 2012, Sub-Antarctic trawl survey December 2011, and Cook Strait acoustic survey of spawning hoki winter 2011. New proportions-at-age data came from the four fisheries and the two trawl surveys. 
Author: McKenzie, A.;
FishingMethod: trawl;
ResearchField: biomass indices, Chatham Rise trawl survey, Sub-Antarctic, Cook Strait, acoustic survey;
ScienceStock: Deepwater;
Species: hoki, Macruronus novaezelandiae;
978-0-478-40597-208/07/2013
Title: Trawl survey of hoki and middle-depth species in the Southland and Sub-Antarctic areas, November–December 2011 (TAN1117).
FAR_2013_23_2604_MDT2010-01A NIW, Obj.1-5, MS10,15,18,21,25.pdf (3.9 MB)
 Results from the fourteenth Tangaroa summer trawl survey of the Southland and Sub-Antarctic areas carried out from 24 November to 23 December 2011 are given in this report. Biomass estimates and population scaled length frequencies are presented for 12 key species. Catch rate data are presented for hoki, hake and ling and include plots for age classes of hoki. Comparisons with earlier surveys are made. Acoustic data collected on the survey are also presented.
Author: Bagley, N.W.; O’Driscoll, R.L.; Oeffner, J.;
FishingMethod: trawl;
ResearchField: biomass estimates, population scaled length frequencies, catch rate data,;
ScienceStock: Deepwater;
Species: hoki, middle-depth species;
Stock: HOK, LIN, HAK;
978-0-478-38866-413/06/2012
Title: Catches, size, and age structure of the 2010–11 hoki fishery, and a summary of input data used for the 2012 stock assessment
12_23_FAR.pdf (3.1 MB)

Catches, size, and age structure of the 2010–11 hoki fishery, and a summary of input data used for the 2012 stock assessment

Author: S.L. Ballara,R.L. O’Driscoll;
FishingMethod: Trawling;
ResearchField: Age-structure; Catch; Size;
ScienceStock: Deepwater;
Species: HOK; Hoki;
Stock: HOK;
978-0-478-38849-707/06/2012
Title: Catches, size, and age structure of the 2009–10 hoki fishery, and a summary of input data used for the 2011 stock assessment.
12_19_FAR.pdf (2.5 MB)
Catches, size, and age structure of the 2009–10 hoki fishery, and a summary of input data used for the 2011 stock assessment.
Author: R.L. O’Driscoll; S.L. Ballara;
FishingMethod: Trawling;
ResearchField: Catch statistics; commercial sampling;
ScienceStock: Deepwater;
Species: HOK; Hoki;
Stock: HOK;
978-0-478-38845-928/05/2012
Title: Acoustic survey of spawning hoki in Cook Strait during winter 2011.
12_17_FAR.pdf (2.1 MB)
Six acoustic snapshots of spawning hoki abundance in Cook Strait were carried out from FV Thomas Harrison and FV Independent 1 between 18 July and 27 August 2011. Acoustic abundance estimates calculated using an average ratio of hoki weight to target strength ranged from 154 000 t to 429 000 t, with an average of 269 000 t (c.v. 35%). Biological data were collected from 27 trawls. Hoki from the Narrows Basin were predominantly male and were smaller (mean length 63 cm) than hoki from the main Cook Strait Canyon (mean length 79 cm).
Author: R. L. O’Driscoll;
FishingMethod: Trawling;
ResearchField: Accoustic survey;
ScienceStock: Deepwater;
Species: HOK; HOKI;
Stock: HOK;
978-0-478-38814-531/05/2012
Title: Trawl survey of hoki and middle-depth species on the Chatham Rise, January 2011(TAN1101)
12_10_FAR.pdf (4.7 MB)

The 20th annual Chatham Rise trawl survey was carried out from 2 to 28 January 2011. 114 bottom trawl stations were successfully completed comprising 88 core (200–800 m) phase one biomass stations, 2 core phase two stations, 23 deep (800–1300 m) stations, and 1 deep phase two station. The estimate of relative core hoki biomass was 93 904 t (c.v. 14.0%), hake was 1 099 t (c.v. 14.9%), and ling was 7 027 t (c.v. 13.8%).

Author: D.W. Stevens; M.R. Dunn; P.L. Horn; R.L. O’Driscoll; S.L. Ballara;
FishingMethod: Bottom trawl;
ResearchField: Chatham Rise; Trawl Survey;
ScienceStock: Middle Depth;
Species: HOK; Hoki;
Stock: HOK;
978-0-477-10581-1 27/03/2015
Title: FAR 2015/20 Trawl and acoustic survey of hoki and middle depth fish abundance on the west coast South Island, July–August 2013 (TAN1308).
FAR_2015_20_2804_HOK2010-04C.pdf (4.5 MB)
A combined trawl and acoustic survey of hoki, hake, ling, and associated species on the west coast South Island (WCSI) was carried out from 26 July to 23 August 2013. This was the tenth in a series of acoustic surveys of WCSI hoki spawning areas. The 2013 acoustic estimate was 13% lower than the equivalent index from 2012 and slightly below the long-term average of the time-series. The survey was also the third in a new time-series of trawl estimates for middle depth species from the WCSI.
Author: Bagley, N.W.; Ballara, S.L.; Ladroit, Y.; O’Driscoll, R.L.;
FishingMethod: Acoustic survey; trawl survey;
ResearchField: acoustic survey; Hokitika canyon south; west coast South Island (WCSI);
ScienceStock: Deepwater;
Species: Hake; Hoki; Ling;
Stock: HAK 7; LIN 7;
978-0-477-10580-4 27/03/2015
Title: FAR 2015/19 Trawl survey of hoki and middle depth species on the Chatham Rise, January 2014 (TAN1401).
FAR_2015_19_2858_HOK2010-05C.pdf (9.3 MB)
The 23rd annual Chatham Rise trawl survey was carried out 2–28 January 2014. In total 119 stations were completed - 85 core (200–800 m) phase 1, 2 core phase 2 and 32 deep (800–1300 m). The estimates of relative core biomass were hoki 101 944 t (CV 9.8%), hake 1377 t (CV 15.2%) and ling 7489 (CV 7.2%). Estimated biomass of orange roughy in core and deep strata was 6916 t (CV 37.7%). Acoustic indices of mesopelagic fish were lower than in 2013.
Author: Ballara, S.L.; Horn, P.L; Ladroit, Y.; MacGibbon, D.J.; O’Driscoll, R.L.; Stevens, D.W.;
FishingMethod: trawl;
ResearchField: acoustic; Eastern stock; hake; hoki; ling; relative abundances;
ScienceStock: Deepwater;
Species: hoki; Macruronus novaezelandiae; orange roughy;
978-0-477-10550-7 25/02/2015
Title: FAR 2015/09 Assessment of hoki (Macruronus novaezelandiae) in 2014.
FAR_2015_09_2878_DEE2010-02HOKC (Obj.1, CS8)_.pdf (1.9 MB)
The 2014 hoki stock assessment is presented. Both stocks (E and W) are estimated to be increasing after reaching their lowest levels in about 2006. The western stock is estimated to be 48-66%B0 and the eastern stock 59-67%B0. Five-year projections were carried out indicating that with assumed catches, the biomass of both stocks is likely to remain stable or rise slightly over the next 5 years.
Author: McKenzie, A.;
FishingMethod: trawl survey;
ResearchField: biomass indices; CASAL stock structure; proportion spawning; proportions-at-age and sex;
ScienceStock: Deepwater;
Species: hoki; Macruronus novaezelandiae;
Stock: HOK1; HOK10;
978-0-477-10541-527/01/2015
Title: FAR 2015/04 Acoustic survey of spawning hoki in Cook Strait and Pegasus Canyon during winter 2013.
FAR_2015_04_2776_HOK2010-03 Objectives 1 & 2, CS11.pdf (3.9 MB)
An acoustic survey of spawning hoki abundance in Cook Strait was carried out using two industry vessels from 21 July to 3 September 2013. Seven of the nine completed Cook Strait snapshots met all the pre-survey criteria for estimating hoki abundance. The average hoki abundance estimate in 2013 was 377 000 t – 20% higher than the equivalent estimate from 2011. A single snapshot of Pegasus Canyon on 20 August 2013 gave an estimated abundance for this area of 134 000 t.
Author: Dunford, A.J.: MacGibbon, D.J.; Ladroit, Y.; O’Driscoll, R.L.;
ResearchField: abundance; Acoustic; Survey;
ScienceStock: HOK;
Species: Hoki;
6108/12/2010
Title: Estimation of fur seal (Arctocephalus forsteri) bycatch in New Zealand trawl fisheries, 2002-03 to 2008-09
AEBR_61.pdf (3.9 MB)

Estimation of fur seal (Arctocephalus forsteri) bycatch in New Zealand trawl fisheries, 2002-03 to 2008-09
Author: Abraham, E.R.; Thompson, F.N.;
FishingMethod: trawl;
Project code: PRO2007-02;
ResearchField: bycatch; marine mammals; non-target species;
ScienceStock: deepwater; middle depths;
Species: ; HOK; SQU;
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