Sampling event Registered February 01, 2019
Catch data from New Zealand research trawls since 2008
Description
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
Geographic scope
- Description
New Zealand region
- Latitude
- From -57 to -24
- Longitude
- From -176.3 to 157
Temporal scope
- single
- January 01, 2008
Methodology
- Sampling
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 steps
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.
Catch weights (kg) are added to the "occurrenceRemarks" field. -Sea temperature recorded by trawl headline sensors are added to the "dynamicProperties" field.
Additional info
Contacts
Kevin Mackay
Originator
Metadata author- Organization
- NIWA
- Position
- Marine Database Manager
- Address
- Private Bag 14-901
- Roles
- Originator
Metadata author
- Roles
- User
David Fisher
Administrative point of contact- Organization
- NIWA
- Position
- Principal Technician - Fisheries
- Address
- Private Bag 14-901
- Roles
- Administrative point of contact
GBIF registration
- Registration date
- February 01, 2019
- Metadata last modified
- November 27, 2019
- Publication date
- November 27, 2019
- Hosted by
- The National Institute of Water and Atmospheric Research (NIWA)
- Installation
- Southwest Pacific Regional OBIS Node
- Endpoints
- Darwin Core Archive
- EML
- Preferred identifier
- 10.15468/gzpcyl
- Alternative identifiers