Catch data from New Zealand research trawls since 2008

Latest version published by Southwestern Pacific Ocean Biogeographic Information System (OBIS) Node on Aug 8, 2018 Southwestern Pacific Ocean Biogeographic Information System (OBIS) Node

This dataset contains data from research trawls that have occurred since 2008 and are stored the NIWA/MPI Trawl database These data results from data collected by research trawl surveys on research vessels and chartered commercial fishing vessels. Trawl surveys are a major tool used by research scientists for stock assessment. They are used to estimate basic parameters of commercial fish populations, including biomass, sex ratio, and the proportion of sexually mature fish, and the distribution of ages and lengths in the population. These parameters may be used in estimating mortality and growth rates.

This dataset is a continuation of data from the NIWA/MPI Trawl database that was initially released as the New Zealand fish and squid distributions from research bottom trawls 1964-2008 available at https://nzobisipt.niwa.co.nz/resource?r=obisprovider

Data Records

The data in this sampling event 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 8,567 records. 2 extension data tables also exist. An extension record supplies extra information about a core record. The number of records in each extension data table is illustrated below.

  • Event (core)
    8567
  • ExtendedMeasurementOrFact 
    93019
  • Occurrence 
    78877

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.

Downloads

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 8,567 records in English (3 MB) - Update frequency: irregular
Metadata as an EML file download in English (7 KB)
Metadata as an RTF file download in English (10 KB)

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:

SWPRON (2017). Catch data from New Zealand research trawls. Southwestern Pacific OBIS, National Institute of Water and Atmospheric Research (NIWA), Wellington, New Zealand, 15157 records, Online http://nzobisipt.niwa.co.nz/resource.do?r=trawl released on April 19, 2017.

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 not been registered with GBIF

Keywords

Occurrence

Contacts

Who created the resource:

Kevin Mackay
Marine Database Manager
NIWA Private Bag 14-901 6241 Wellington New Zealand NZ

Who can answer questions about the resource:

David Fisher
Principal Technician - Fisheries
NIWA Private Bag 14-901 6241 Wellington New Zealand NZ

Who filled in the metadata:

Kevin Mackay
Marine Database Manager
NIWA Private Bag 14-901 6241 Wellington New Zealand NZ

Who else was associated with the resource:

User
Kevin Mackay

Geographic Coverage

New Zealand region

Bounding Coordinates South West [-57, -176.3], North East [-24, 157]

Temporal Coverage

Start Date 2008-01-01

Sampling Methods

Most records are from random bottom trawls, but there are also records from midwater trawls, scampi trawls and non-random tows (such as gear trials and target tows).

Study Extent Fisheries research trawls since 2008 over the New Zealand EEZ area
Quality Control The scientific names have been mapped to the World Register of Marine Species (WoRMS), using the online taxon match tool. All sampling locations have been plotted on a map to perform a visual check. The most important check would be to see if all sampling locations are (1) in the marine and/or brackish environment and (2) within the described sampling area.

Method step description:

  1. Only successful trawl records were selected. All "foul" shots are excluded as the net may have ripped and some species may have escaped on hauling. All species identification have been validated and outliers based on geographic and depth distributions have been checked.
  2. Catch weights (kg) are added to the "occurrenceRemarks" field. -Sea temperature recorded by trawl headline sensors are added to the "dynamicProperties" field.

Additional Metadata

marine, harvested by iOBIS

Alternative Identifiers https://nzobisipt.niwa.co.nz/resource?r=trawl