Dataset: trawl_catch_fishlen - CGOA
Deployment: PA0401

Fish lengths from CGOA trawl data

Principal Investigator:

Jack Piccolo (University of Alaska Fairbanks, UAF)

Project:

U.S. GLOBEC Northeast Pacific (NEP)

Current State:

Final no updates expected

Data URL:

https://osprey.bco-dmo.org/dataset-deployment/455414/data

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Description

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

Methods & Sampling

Dataset acquisition description

Data Processing Description

Dataset 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

More information about this dataset deployment

Funding

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

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

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

Database

Contribute Data

Dataset: trawl_catch_fishlen - CGOA
Deployment: PA0401

Dataset acquisition description

Dataset Processing Description

Database

Contribute Data

Dataset: trawl_catch_fishlen - CGOADeployment: PA0401

Dataset acquisition description

Dataset Processing Description

Dataset: trawl_catch_fishlen - CGOA
Deployment: PA0401