421890f7-e909-40ed-a573-b1c9529a55fa https://nzobisipt.niwa.co.nz/resource?r=trawl Kevin Mackay NIWA Marine Database Manager

Private Bag 14-901 Wellington New Zealand 6241 NZ

Kevin Mackay NIWA Marine Database Manager

Private Bag 14-901 Wellington New Zealand 6241 NZ

Kevin Mackay kevin.mackay@niwa.co.nz user 2019-11-27 eng 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 Occurrence GBIF Dataset Type Vocabulary: http://rs.gbif.org/vocabulary/gbif/dataset_type.xml marine, harvested by iOBIS This work is licensed under a Creative Commons Attribution (CC-BY) 4.0 License. New Zealand region -176.3 157 -24 -57 2008-01-01 irregular David Fisher NIWA Principal Technician - Fisheries

Private Bag 14-901 Wellington New Zealand 6241 NZ

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. Fisheries research trawls since 2008 over the New Zealand EEZ area 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). 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. 2017-01-11T02:56:15.648+13:00 dataset 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. https://nzobisipt.niwa.co.nz/logo.do?r=trawl 421890f7-e909-40ed-a573-b1c9529a55fa/v1.23.xml