Dataset: NH1106 Midwater Trawl
Deployment: NH1106

Descriptive data from Isaacs-Kidd midwater trawls (IKMT) from NH1106, Guaymas Basin.

Principal Investigator:

Kelly Benoit-Bird (Oregon State University, OSU-CEOAS)

Contact:

Chad Waluk (Oregon State University, OSU-CEOAS)

BCO-DMO Data Manager:

Shannon Rauch (Woods Hole Oceanographic Institution, WHOI BCO-DMO)

Project:

Hypoxia and the ecology, behavior and physiology of jumbo squid, Dosidicus gigas (Jumbo Squid Physiology)

Current State:

Final no updates expected

Version:

08 Aug 2013

Version Date:

2013-08-08

Data URL:

https://www.bco-dmo.org/dataset-deployment/456065/data

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Description

Sampling locations, depths, times, etc. from midwater trawls performed on the NH1106 cruise in the Guaymas Basin. Samples are archived in the biocuration facility at Oregon State University.

Methods & Sampling

Dataset acquisition description

Tows with a 2m x 2m Isaacs-Kidd Midwater trawl (IKMT), 7m in length, with a 1mm mesh were conducted periodically throughout the cruise. The net was fitted with a Simrad PI depth sensor that provides net depth information in real time acoustically. Trawls were targeted to depths of interest based on acoustic sampling with the goal of achieving 20 minutes of towing time at the target depth at a target speed of 4 knots. Samples were preserved in 5% buffered formalin in seawater and are archived in the biocuration facility at Oregon State University.

Data Processing Description

Dataset Processing Description

BCO-DMO Processing Notes:
- Modified parameter names to conform with BCO-DMO naming conventions.
- Created separate min and max columns for sog, depth_btm, and target_depth.

More information about this dataset deployment

Funding

Award Number	Funding Source
OCE-0851239	NSF Division of Ocean Sciences

Instruments

Isaacs-Kidd Midwater Trawl

Supplied Description:

IKMT with 2-meter by 2-meter mouth opening; 7 meters in length.

Instrument Type

Generic Name: Isaacs-Kidd Midwater Trawl

Acronym: IKMT

Community Identifier: http://vocab.nerc.ac.uk/collection/L22/current/NETT0071/

Generic Description:

A trawl with a pentagonal mouth opening and a dihedral depressor vane as part of the mouth opening. IKMTs come in various dimensions (refer to individual dataset documentation).

The original IKMTs were 10 foot (304 cm) and 15 foot (457 cm) at the mouth. The 10 foot IKMT net was 31 feet (9.45 m) in length (Wiebe and Benfield 2003).

Parameters

Supplied Name	Supplied description	Supplied Units	Standard Name
cruise_id	Cruise identifier.	text	cruise_id
instrument	Type of sampling instrument. IKMT = Isaacs-Kidd midwater trawl.	text	instrument
tow	Tow number.	integer	tow
location	General location of sampling.	text	site_descrip
lat_start	Latitude at start of tow.	decimal degrees	lat_start
lon_start	Longitude at start of tow.	decimal degrees	lon_start
target_depths	Target depth(s).	meters	depth
target_depth_min	Minimum of the target depth(s).	meters	depth_min
target_depth_max	Maximum of the target depth(s).	meters	depth
day_or_night	Time of day (Day or Night).	text	time_of_day
depth_btm_min	Minimum bottom depth. (Note: gt = "greater than")	meters	depth_bottom
depth_btm_max	Maximum bottom depth. (Note: gt = "greater than")	meters	depth_bottom
date_start	Date when the net entered the water (GMT) in mm/dd/YYYY format.	unitless	date_begin
time_start	Time when the net entered the water (UTC).	HH:MM	time_start
time_end	Time when the net exited the water (UTC).	HH:MM	time_end
time_start_target_depth	Start time at target depth (UTC).	HH:MM	time_begin
time_end_target_depth	Stop time at target depth (UTC).	HH:MM	time_end
sog_min	Minimum speed over ground.	knots	sog
sog_max	Maximum speed over ground.	knots	sog
wire_out_max	Maximum wire out.	meters	wire_out
portion_cod_end_filled	Portion (fraction) of cod end filled. (Note: lt = "less than")	fraction	no_bcodmo_term
pcnt_catch_preserved	Percent of catch preserved.	percent (%)	no_bcodmo_term
no_jars_preserved	Number of jars preserved.	integer	no_bcodmo_term
notes	Free-text notes about the tow.	text	comment

Database

Contribute Data

Dataset: NH1106 Midwater Trawl
Deployment: NH1106

Dataset acquisition description

Dataset Processing Description

Database

Contribute Data

Dataset: NH1106 Midwater TrawlDeployment: NH1106

Dataset acquisition description

Dataset Processing Description

Dataset: NH1106 Midwater Trawl
Deployment: NH1106