Dataset: Trawl survey: locations and times
Deployment: PelagicHypoxia_trawlsurveys

trawl survey locations and times

View Data: For data, See Dataset Metadata Page: https://www.bco-dmo.org/dataset/718649

Principal Investigator:

Timothy Essington (University of Washington, UW)

Co-Principal Investigator:

John K. Horne (University of Washington, UW)

Julie E. Keister (University of Washington, UW)

Sandra Parker-Stetter (Northwest Fisheries Science Center - Seattle, NOAA NWFSC)

Contact:

Timothy Essington (University of Washington, UW)

BCO-DMO Data Manager:

Amber D. York (Woods Hole Oceanographic Institution, WHOI BCO-DMO)

Project:

Consequences of hypoxia on food web linkages in a pelagic marine ecosystem (PelagicHypoxia)

Version:

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Description

This dataset contains trawl survey locations and times from R/V Centennial trawl surveys in the Hood Canal, WA from 2012-2013.

Methods & Sampling

Dataset acquisition description

Sampling and analytical procedures:
Samples were chosen to target representative aggregations of fish as detected using multi-beam hydroacoustics. They are not designed to provide quantitative estimates of density, but rather to assess species and size composition and to collect individuals for tissue and stomach sampling. Net was a Marinovich midwater trawl, deployed using two wires and 2.5 meter FishBuster trawl doors. Trawl was fitted with a 3.2 mm knotless liner in the codend and towed at a vessel speed of 2−3 knots. Vertical opening of the trawl varied between 4.8 and 7.0 m.

Instruments:
Trawl depth measured using Kongsberg Marine P150 net monitor.
Vessel position measured using on board GPS (Simrad)

Data Processing Description

Dataset Processing Description

BCO-DMO Data Manager Processing Notes:
* added a conventional header with dataset name, PI name, version date
* modified parameter names to conform with BCO-DMO naming conventions

More information about this dataset deployment

Funding

Award Number	Funding Source
OCE-1154648	NSF Division of Ocean Sciences

Instruments

GPS receiver

Supplied Name: Simrad GPS

Supplied Description:

Vessel position measured using on board GPS (Simrad)

Instrument Type

Generic Name: GPS receiver

Generic Description:

Acquires satellite signals and tracks your location.

This term has been deprecated. Use instead: https://www.bco-dmo.org/instrument/560

Midwater Trawl

Supplied Name: Marinovich midwater trawl

Supplied Description:

Instrument Type

Generic Name: Midwater Trawl

Acronym: TrawlMid

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/23/

Generic Description:

A mid-water or pelagic trawl is a net towed at a chosen depth in the water column to catch schooling fish such as herring and mackerel. Midwater trawl nets have very large front openings to herd schooling fish toward the back end where they become trapped in the narrow "broiler". The sides of the deployed net are spread horizontally with two large metal foils, called "doors," positioned in front of the net. As the trawler moves forward, the doors, and therefore the net, are forced outward, keeping the net open.
This instrument designation is used when specific make and model are not known.

Water Depth Logger

Supplied Name: Kongsberg Marine P150 net monitor

Supplied Description:

Trawl depth measured using Kongsberg Marine P150 net monitor.

Instrument Type

Generic Name: Water Depth Logger

Generic Description:

For measuring and recording water levels in rivers, streams, and wells.

Parameters

Supplied Name	Supplied description	Supplied Units	Standard Name
Trawl_ID	Unique identifier for each trawl tow	unitless	tow
Date	Trawl date in format yyyy-mm-dd	unitless	date
Year	Year of sample in format yyyy	unitless	year
Month	month of sample	unitless	month
Day	Day of month	unitless	day
Start_Time_PDT	Time tow deployed (PDT)	unitless	time
End_Time_PDT	Time that tow retrieval began (PDT)	unitless	time
EQ_Lat	Latitude of vessel when net reached equilibrium depth	Degrees Minutes	lat
EQ_Lat_dd	Latitude of vessel when net reached equilibrium depth	decimal degrees	lat
EQ_Long	Longitude of vessel when net reached equilibrium depth	Degrees Minutes	lon
EQ_Long_dd	Longitude of vessel when net reached equilibrium depth	decimal degrees	lon
EQ_depth	Depth of net when reached equilibrium	meters	depth
Start_Timestamp_UTC	ISO timestamp when net was deployed based on the ISO 8601:2004(E) standard in format YYYY-mm-ddTHH:MMZ (UTC)	unitless	ISO_DateTime_UTC
End_Timestamp_UTC	ISO timestamp when tow retrieval began based on the ISO 8601:2004(E) standard in format YYYY-mm-ddTHH:MMZ (UTC)	unitless	ISO_DateTime_UTC

Database

Contribute Data

Dataset: Trawl survey: locations and times
Deployment: PelagicHypoxia_trawlsurveys

Dataset acquisition description

Dataset Processing Description

Database

Contribute Data

Dataset: Trawl survey: locations and timesDeployment: PelagicHypoxia_trawlsurveys

Dataset acquisition description

Dataset Processing Description

Dataset: Trawl survey: locations and times
Deployment: PelagicHypoxia_trawlsurveys