Dataset: Trawl survey: catch composition
Deployment: PelagicHypoxia_trawlsurveys

Trawl catch composition

View Data: For data, See Dataset Metadata Page: https://www.bco-dmo.org/dataset/718662

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 catch composition data from R/V Centennial trawl surveys in the Hood Canal, WA from 2012-2013. The species name, estimated number, and estimated mass are included for each tow.

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.

Catch was sorted by taxonomic group, and counted. Mass of catch was measured using a Marel M1100 series bench scale to nearest 0.1 kg. In instance of large catch of species, total number was determined by counting a weighed subsample (usueally more than 0.25 of the total catch by weight).

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
* comma to ;
* apostrophes deleted due to characer restrictions
* NA-> "nd" for "no data"
* blank values in the column indicating the sample was on juvenile changed to "N" for clarity.

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
HCTow	Unique identifier for each trawl deployment	unitless	tow
Month	Sample Cruise Month	unitless	month
Year	Sample cruise year	unitless	year
Site	Site identifier	unitless	site
Diel	Day (D) or Night (N) sample	unitless	diel
Replicate	Unique identifier for tows conducted at same site / time period	unitless	replicate
Species_name	Name of species or taxonomic group	unitless	species
Juvenile	Is the measurement on juveniles of that group (Y/N)	unitless	sample_descrip
Number	Estimated number in tow	per individual	count
Mass	Estimated mass in tow	kilograms (kg)	weight

Database

Contribute Data

Dataset: Trawl survey: catch composition
Deployment: PelagicHypoxia_trawlsurveys

Dataset acquisition description

Dataset Processing Description

Database

Contribute Data

Dataset: Trawl survey: catch compositionDeployment: PelagicHypoxia_trawlsurveys

Dataset acquisition description

Dataset Processing Description

Dataset: Trawl survey: catch composition
Deployment: PelagicHypoxia_trawlsurveys