Trawl (trawl)

The trawl database is the major fisheries research database. It results from data collected by research trawl surveys on research vessels and chartered commercial fishing vessels. This database is maintained by NIWA for MPI.

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.

Sampling frequency: variable. Database records start in 1960 and continue to present.

Number of sites: variable.

Extent of site: entire EEZ and beyond. Lat/Long provided for all data.

Number of replicates: N/A.

Measured variables: Data include sea temperature, depth, location, fishing vessel, date, catch weight, species, trawl speed, trawl time, weight of each fish species caught, and length, sex and age data for selected species.

Sampling protocol & QA: inshore and deepwater research trawl surveys conducted in New Zealand waters.

In addition to the trawl information other information collected during trawl surveys are also included in the database e.g. camera deployments, CTD probes, plankton, physical measurements, blue cod potting.

Depth range: 2 to 3500 m.

 
Citation proposal
. Trawl (trawl). https://dc.niwa.co.nz:/niwa_dc/srv/api/records/d1e1f094-c9b4-45b8-a3a2-85719bd30075
 

INSPIRE

Identification

File identifier
d1e1f094-c9b4-45b8-a3a2-85719bd30075   XML
Hierarchy level
Dataset
Online resource
Protocol
WWW:LINK-1.0-http--metadata-URL
Protocol
WWW:LINK-1.0-http--downloaddata
Resource identifier
Metadata language
eng
Encoding
Projection
 

Classification of data and services

Topic category
  • Oceans
 

Classification of data and services

Coupled resource
Coupled resource
 
 

Classification of data and services

Coupled resource
Coupled resource
 
 

Keywords

Other keywords
Keywords
  • ocean coastal water column ecological physical seamount trawl ctd video
 
 

Geographic coverage

N
S
E
W


 

Temporal reference

Temporal extent
Temporal extent
Date
 

Quality and validity

 

Conformity

Conformity
Conformity
 

Conformity

Conformity
Conformity
 

Restrictions on access and use

Use limitation
In 2001, the Ministry of Fisheries acquired Soviet trawl survey data from the New Zealand region collected from 52 trawl surveys covering the period from 1964 to 1987. Nothing is known about the sampling strategy employed by the Soviets during these surveys. No stratum information was given, so they are assumed to be non-stratified. These data are of dubious quality and were collected to unknown standards, and hence are held separate from all other trawl survey data.
Use limitation
To access data permission is required from [email protected].
 

Restrictions on access and use

 

Responsible organization (s)

Contact for the resource
Organisation name
Ministry for Primary Industries
Email
[email protected]
 

Responsible organization (s)

Contact for the resource
Organisation name
Ministry for Primary Industries
Email
[email protected]
 

Metadata information

Contact for the metadata
Organisation name
NIWA National Insititute of Water & Atmospheric Research
Email
[email protected]
Date stamp
2012-09-14T09:21:58
Character set
UTF8
 
 

SDS

Conformance class 1: invocable

Access Point URL
Endpoint URL
Technical specification
 

Conformance class 2: interoperable

Coordinate reference system
 
Quality of Service
 
Access constraints
Limitation
 
Use constraints
Limitation
 
Responsible custodian
Contact for the resource
 
 

Conformance class 3: harmonized

 
 

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