This report summarises bycatch and discards of fish and invertebrates in New Zealand arrow squid and scampi trawl fisheries for 2002–03 to 2015–16, based on analysis of fisheries observer and commercial catch effort data. Barracouta, silver warehou, and spiny dogfish were the main bycatch species in the arrow squid fishery, with total annual bycatch of 9000–40000 t and discards of 1000–16000 t. Javelinfish, other rattails, and sea perch were the main bycatch species in the scampi fishery, with total annual bycatch of 2400–5600 t and discards of 900–4100 t.

Research on black petrel at Little Barrier and Great Barrier Island in the 2016/17 breeding season followed 448 black petrel study burrows; of these 65% were occupied by breeding pairs and breeding success was 68%. Annually adult survival was 95%. Passive acoustic monitoring confirmed black petrels are concentrated within the summit ridges on Little Barrier Island and the Mt Hobson area on Great Barrier Island. Satellite GPS devices tracked 3 fledglings following an eastward migration route.

In New Zealand, captures of seabirds and other protected species are recorded by government observers when they are on-board commercial fishing vessels. This report addresses the question of how many seabirds would be reported caught if every commercial trawl and longline vessel fishing within New Zealand’s Exclusive Economic Zone carried an observer. Statistical models were used to scale up from observed captures, to estimate total captures across all commercial trawl and longline fisheries. Estimates were made for the 2002–03 to 2014–15 fishing years for trawl fisheries, and for the 1998–99 to 2014–15 fishing years for longline fisheries.

The Ministry for Primary Industries (MPI) is developing a risk assessment framework to identify the nature and extent of risks to chondrichthyan populations. This project aims to fill some of the knowledge gaps for some of the high-risk, non-Quota Management System species to reduce the level of uncertainty in the risk assessments of those species, and to provide information on their productivity that can then be used as inputs into future quantitative risk assessments. The species included in this study were seal shark (Dalatias licha), Owston’s dogfish (Centroscymnus owstonii), longnose velvet dogfish (Centroselachus crepidater), and Plunket’s shark (Scymnodon plunketi). Specimens and data were collected aboard commercial fishing vessels and research vessels, and integrated with existing data and specimens held by NIWA.

Age and growth were estimated for carpet shark, common electric ray and blind electric ray from growth increments on their vertebrae and eye lenses. All three species grow moderately fast, and longevity is low to moderate compared with other elasmobranchs. Length and age at maturity, length at birth/hatching, and litter size were estimated. The length of the gestation period, and whether females have a resting period between pregnancies, are poorly known.

Historical information indicates an increasing range of fish and invertebrates were exploited in these regions once commercial fisheries were established in the 1860s. Noticeable declines in abundance of easily exploited species occurred in the late 19th and early 20th centuries prior to the collection of fishery statistics. Until 1935, action to conserve fisheries was greatly impeded by a lack of consistently collected landings data. Similar studies of other regions would be beneficial.

Historical information indicates an increasing range of fish and invertebrates were exploited in these regions once commercial fisheries were established in the 1860s. Noticeable declines in abundance of easily exploited species occurred in the late 19th and early 20th centuries prior to the collection of fishery statistics. Until 1935, action to conserve fisheries was greatly impeded by a lack of consistently collected landings data. Similar studies of other regions would be beneficial.

The bottom-contacting deepwater Tier 1 and Tier 2 target fishstock footprint for 1990–2016 was estimated at 335 812 km2. This represents 8.2% of the Territorial Sea and EEZ seafloor area and 24% of the seafloor open to fishing, down to 1600 m. Tier 1 fisheries accounted for 93%, with hoki effort contributing 50%. The 2016 footprint covered 44 261 km2, 76 km2 of which was not contacted during 1990–2015. The aggregated swept area was 3.07 million km2 for 1990–2016 and 78 372 km2 for 2016.

This report documents the preparation of data on observed protected species captures in New Zealand fisheries during the period between 2002–03 and 2014–15. Recorded captures included captures of seabirds, marine mammals, and turtles. The observer records were linked to fishing effort data, and corrections to capture records and species identifications were made, prompted by expert reviews through necropsies and photograph examinations.

This supplementary information supports the risk assessment of the impact of fishing-related mortalities on seabirds breeding in the New Zealand region. It provides summaries of population and distributional data for the 71 seabird taxa included in the risk assessment. The distributional maps include breeding and non-breeding distributions and also present observer data of incidental captures in commercial fisheries.

This study provides an assessment of the impact of fishing-related fatalities on the populations of 35
marine mammal (sub)species that inhabit New Zealand waters. The assessment included mortalities
caused by trawl, longline, set-net and purse-seine fisheries within New Zealand’s Exclusive Economic
Zone (EEZ). The risk assessment was an implementation of the Spatially Explicit Fisheries Risk Assessment
(SEFRA) method. Risk was defined as the ratio of Annual Potential Fatalities (APF; an estimate of
the number of marine mammals killed in fisheries each year) to the Population Sustainability Threshold
(PST; a measure of the population productivity). A risk index higher than one indicates that fisheries
mortalities are at a level that may prevent the population increasing to, or remaining above, half the
carrying capacity in the long term.

Commercial fisheries in New Zealand waters interact with non-target species, with some of these interactions resulting in incidental captures and mortality. Captures of protected species are documented by fisheries observers, providing an independent record of the number and identify of the species captured in New Zealand’s Exclusive Economic Zone (EEZ). For species with sufficient numbers of observed captures, the observer records and fishing effort data are used to develop statistical models to estimate the total number of captures across species and fisheries in New Zealand waters. This study presents total capture estimates of marine mammals and sea turtles in trawl and longline fisheries for the period between the 1995–96 and 2014–15 fishing years (a fishing year runs from 1 October to 30 September).