Protected species bycatch in New Zealand fisheries

Occurrence
Latest version published by Southwestern Pacific Ocean Biogeographic Information System (OBIS) Node on Aug 29, 2022 Southwestern Pacific Ocean Biogeographic Information System (OBIS) Node
Home:
https://data.dragonfly.co.nz/psc/
Publication date:
29 August 2022
License:
CC-BY 4.0

Download the latest version of this resource data as a Darwin Core Archive (DwC-A) or the resource metadata as EML or RTF:

Data as a DwC-A file download 12,078 records in English (536 KB) - Update frequency: irregular
Metadata as an EML file download in English (11 KB)
Metadata as an RTF file download in English (10 KB)

Description

Seabirds, marine mammals, and turtles are caught during commercial fishing operations within the New Zealand Exclusive Economic Zone. In order to monitor the impacts of fishing on these species, New Zealand government observers on fishing vessels record any protected species bycatch incidents that occur. Observer data on protected species captures are maintained by the Ministry for Primary Industries, with identification of captured animals carried out by the Department of Conservation. The data have been summarised in a series of reports, with the most recent report covering the period from 2002–03 to the end of the 2008–09 fishing year (Abraham and Thompson 2011b).This dataset provides a summary of protected species bycatch in trawl and longline fisheries, from the 2002–03 to 2019–20 fishing year (fishing years run from October 1 to September 30).Observers are only present on some fishing vessels. To estimate total captures in a fishery, it is necessary to use statistical methods to extrapolate from the observed fishing to the unobserved fishing. The total observable captures are an estimate of the captures that would have been reported, had observers been present on all fishing vessels. There may be additional mortalities (such as birds that are struck by fishing gear but not brought on board the vessel) that are not recorded by observers. These are referred to as ‘cryptic mortalities’ and are not included in the estimates of total captures, nor is there any evaluation of potential survival of seabirds recorded as captured but subsequently released alive. The methods used for the estimation follow those described in technical reports on bycatch estimation for seabirds (Abraham and Thompson 2011a, Abraham et al. 2013), and marine mammals (Thompson et al. 2013).####Notes about some Fields: - **fishing_year** the fishing year of the capture. Fishing years run from 1 October to 30 September; - **datetime** the date and time of the capture. All times are in New Zealand Standard Time (GMT+12); - **status** whether the animal was alive or dead; - **identification** how the identification was made (necropsy: by necropsy of the dead animal; photograph: from an expert inspection of a photograph of the capture; imputation: imputed by correcting the observer code using necropsy and photographic identifications of other captures with the same observer identification; as reported by the observer); - **method** the fishing method (surface longline; bottom longline; trawl; set net; or purse seine); - **target** the target species reported by the fisher; - **vessel_size** the length class of the vessel (a range in m).

Data Records

The data in this occurrence resource has been published as a Darwin Core Archive (DwC-A), which is a standardized format for sharing biodiversity data as a set of one or more data tables. The core data table contains 12,078 records.

This IPT archives the data and thus serves as the data repository. The data and resource metadata are available for download in the downloads section. The versions table lists other versions of the resource that have been made publicly available and allows tracking changes made to the resource over time.

Versions

The table below shows only published versions of the resource that are publicly accessible.

How to cite

Researchers should cite this work as follows:

Abraham E R, Thompson F N (2016): Protected species bycatch in New Zealand fisheries. v1.6. Southwestern Pacific Ocean Biogeographic Information System (OBIS) Node. Dataset/Occurrence. https://nzobisipt.niwa.co.nz/resource?r=protected_species_bycatch_nz&v=1.6

Rights

Researchers should respect the following rights statement:

The publisher and rights holder of this work is Southwestern Pacific Ocean Biogeographic Information System (OBIS) Node. This work is licensed under a Creative Commons Attribution (CC-BY 4.0) License.

GBIF Registration

This resource has been registered with GBIF, and assigned the following GBIF UUID: 2cd1e1df-4881-404e-8303-31d42e304fb4.  Southwestern Pacific Ocean Biogeographic Information System (OBIS) Node publishes this resource, and is itself registered in GBIF as a data publisher endorsed by Ocean Biodiversity Information System.

Keywords

Occurrence; Occurrence

Contacts

E. R. Abraham
  • Originator
  • CEO
Dragonfly Data Science
  • PO Box 27535
6141 Wellington
New Zealand
NZ
F. N. Thompson
  • Originator
  • co-author
Dragonfly Data Science
  • PO Box 27535
6141 Wellington
NZ
Edward Abraham
  • Metadata Provider ●
  • Point Of Contact
  • CEO
Dragonfly Data Science
  • PO Box 27535
6141 Wellington
New Zealand
NZ

Geographic Coverage

New Zealand Exclusive Economic Zone

Bounding Coordinates South West [-57, -165], North East [-24, 157]

Temporal Coverage

Start Date / End Date 2002-10-01 / 2020-09-30

Bibliographic Citations

  1. Abraham E. R., Thompson F. N. (2014). Captures of turtles in trawl fisheries, in the New Zealand Exclusive Economic Zone, from 2002–03 to 2012–18. https://data.dragonfly.co.nz/psc/v20140201/turtles/trawl/all-vessels/eez/all/
  2. Abraham E. R., Thompson F. N. (2014). Captures of all birds in trawl fisheries, in the New Zealand Exclusive Economic Zone, from 2002–03 to 2012–18. https://data.dragonfly.co.nz/psc/v20140201/birds/trawl/all-vessels/eez/all/
  3. Abraham E. R., Thompson F. N. (2014). Captures of whales and dolphins in trawl fisheries, in the New Zealand Exclusive Economic Zone, from 2002–03 to 2012–18. https://data.dragonfly.co.nz/psc/v20140201/whales-and-dolphins/trawl/all-vessels/eez/all/
  4. Abraham E. R., Thompson F. N. (2014). Captures of New Zealand sea lion in trawl fisheries, in the New Zealand Exclusive Economic Zone, from 2002–03 to 2012–18. https://data.dragonfly.co.nz/psc/v20140201/new-zealand-sea-lion/trawl/all-vessels/eez/all/
  5. Abraham E. R., Thompson F. N. (2014). Captures of New Zealand fur seal in trawl fisheries, in the New Zealand Exclusive Economic Zone, from 2002–03 to 2012–18. https://data.dragonfly.co.nz/psc/v20140201/new-zealand-fur-seal/trawl/all-vessels/eez/all/
  6. Abraham E. R., Thompson F. N. (2014). Captures of other seals in trawl fisheries, in the New Zealand Exclusive Economic Zone, from 2002–03 to 2012–18. https://data.dragonfly.co.nz/psc/v20140201/other-seals/trawl/all-vessels/eez/all/

Additional Metadata

marine, harvested by iOBIS

Alternative Identifiers f55751e3-ac05-4f11-b70f-7b81cb397452
https://nzobisipt.niwa.co.nz/resource?r=protected_species_bycatch_nz