Dataset: trawl_catch_fishlen - CGOA

Name: Fish lengths from CGOA trawl data from multiple cruises on R/V Pandalus in the Northeast Pacific, Coastal Gulf of Alaska from 1999-2004 (NEP project)
Published: 2012-08-13
Keywords: oceans

Cite This Dataset

Spatial Extent: N:60.534 E:-147.6683 S:58.0983 W:-149.748

Project:

U.S. GLOBEC Northeast Pacific (NEP)

Program:

U.S. GLOBal ocean ECosystems dynamics (U.S. GLOBEC)

Principal Investigator:

Jack Piccolo (University of Alaska Fairbanks, UAF)

Version:

2012-08-13

Version Date:

2012-08-13

Validated:

Yes

Current State:

Final no updates expected

Fish lengths from CGOA trawl data from multiple cruises on R/V Pandalus in the Northeast Pacific, Coastal Gulf of Alaska from 1999-2004 (NEP project)

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Archival Copy

Version Date	Archive	Persistent Identifier	Date Assigned
2012-08-13	National Oceanographic Data Center (NODC)	0115222	2013-12-22

Description

These data are related to Trawl Catch data found here. Please see these data for details about trawls.

Data Processing Description

Notes from the PI:
How I classified salmon (according to information from Nancy Davis and from looking at her high seas catch (lengths and ages) data [reference pending]):

coho <375mm = juvenile

coho >375mm = maturing

pink <375mm = juvenile

pink >375mm = maturing

The categories for sockeye, chinook, and chum are more difficult to determine and are based on length frequencies as well as age/length data from the high seas cruise Nancy Davis goes on. [reference pending]

sockeye <235mm = juvenile

sockeye >235mm = immature/maturing

The minimum fork length of a sockeye (ocean age 1) was 231mm in Nancy Davis' high seas data (2001) [reference pending]; most were ~300mm

chinook>300mm = immature/maturing

chum<270mm = juvenile

chum>270mm = immature/maturing

The minimum fork length of a chum (ocean age 1) was 280mm in Nancy Davis' high seas data (2001)[reference pending]; most were ~300-350mm

Questions about these data should be directed to:
Jack Piccolo
UAF / SFOS
11120 Glacier Highway
Juneau, AK 99801
ftjjp1@uaf.edu
Phone: 907-796-2055

Data Files

File
trawl_catch_fishlen.csv (Comma Separated Values (.csv), 1.06 MB) MD5:1956756b86203c4bc3ee41837419a855 Primary data file for dataset ID 3703

More Information about this dataset

Funding Sources

Funding Source	Award Number
National Oceanic and Atmospheric Administration	unknown NEP NOAA
NSF Division of Ocean Sciences	unknown NEP NSF OCE

Deployments

Deployment	Synonyms	Start Date	Platform	Investigator
PA0001	G00-1		R/V Pandalus		data info
PA0101		2001-07-08	R/V Pandalus	Lewis J. Haldorson (Chief Scientist)	data info
PA0102		2001-08-11	R/V Pandalus	Jennifer L. Boldt (Chief Scientist)	data info
PA0103		2001-09-18	R/V Pandalus	Lewis J. Haldorson (Chief Scientist)	data info
PA0104		2001-10-21	R/V Pandalus	Jennifer L. Boldt (Chief Scientist)	data info
PA0201		2002-07-20	R/V Pandalus	Lewis J. Haldorson (Chief Scientist)	data info
PA0202		2002-08-20	R/V Pandalus	Lewis J. Haldorson (Chief Scientist)	data info
PA0203		2002-10-03	R/V Pandalus	Jennifer L. Boldt (Chief Scientist)	data info
PA0301		2003-07-13	R/V Pandalus	Lewis J. Haldorson (Chief Scientist)	data info
PA0302		2003-08-01	R/V Pandalus	Lewis J. Haldorson (Chief Scientist)	data info
PA0303		2003-09-09	R/V Pandalus	Jack Piccolo (Chief Scientist)	data info
PA0401		2004-07-18	R/V Pandalus	Lewis J. Haldorson (Chief Scientist)	data info
PA0402		2004-08-17	R/V Pandalus	Jack Piccolo (Chief Scientist)	data info
PA0403		2004-09-12	R/V Pandalus	Lewis J. Haldorson (Chief Scientist)	data info
PA9701	G97-1		R/V Pandalus		data info
PA9801	G98-1		R/V Pandalus		data info
PA9802	G98-2		R/V Pandalus		data info
PA9901	G99-1	1999-08-26	R/V Pandalus		data info
PA9902	G99-2		R/V Pandalus		data info

Instruments

Gillnet

Supplied Description:

Instrument Type

Generic Name: Gillnet

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/65/

Generic Description:

Gillnetting uses curtains of netting that are suspended by a system of floats and weights; they can be anchored to the sea floor or allowed to float at the surface. A gillnet catches fish by their gills because the twine of the netting is very thin, and either the fish does not see the net or the net is set so that it traps the fish.

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.

Parameters

Date and time formats are described in python strftime() syntax.

Supplied Name	Supplied description	Supplied Units	Standard Name
cruiseid	Cruise identification. Note that this group used non standard cruise names; this field uses the standard naming convention; 'cruise_alt' is the alternate name.	text	cruiseid
year	4-digit year.	YYYY	year
ship	Name of the ship.	text	ship
cruise_alt	Alternate name for cruise (used locally).	text	cruiseid
event	Sampling event number (station-cast). DMO note: there is occasional discrepancy between trawl data and cruise event log for this field.	unitless	event
station_std	Standard station identifier for stations revisited by many cruises.	unitless	station_std
lat	Latitude in decimal degrees; North is positive; this info came from the table of standard station locations where possible or else from the cruise event log.	decimal degrees	lat
lon	Longitude in decimal degrees; East is positive; this info came from the table of standard station locations where possible or else from the cruise event log.	decimal degrees	lon
gear	Net type used to catch fish.	text	instrument
month_local	Month, local time.	mm (0 to 12)	month_local
day_local	Day of month, local time.	dd (0 to 31)	day_local
common_name	Common name of the species.	text	common_name
life_stage	Life stage of the individual (see Processing Notes).	text	stage
species	Scientific name of the fish.	text	species
forklength_mm	Measurement from the tip of the snout with mouth closed to the center of the fork in the tail, in millimeters.	millimeters	length
comments	Misc. notes.	text	comment

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Database

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Dataset: trawl_catch_fishlen - CGOA