Table of Contents

• Coverage
• Dataset Description
  • Methods & Sampling
  • Data Processing Description
• Data Files
• Parameters
• Instruments
• Deployments
• Project Information
• Program Information
• Funding

Coastal Gulf of Alaska Trawl Data

Notes
1) This file was created to separate surface trawl samples used exclusively from 2001-2004 from gillnet and midwater trawl samples used in prior years. CPUE calculations based on these different gear types may not be directly comparable.
2) Gillnet and midwater trawl catch data from prior years will be reported separately.
3) Gear abbreviations: T = Surface Trawl
4) Gear description: Nordic 264 surface rope trawl (198-m long, 25-m wide, 35-m vertical height, equipped with a 1.2-cm mesh liner in cod end) towed at the surface.
5) Start times for trawls are when all warp wire and doors have been let out, and end times are when warp wire retrival begins.
6) Numbers of fish caught from an event listed in this file may not match the count of number of fish measured in the "Glength_September_2005" file because in some cases the number of fish measured was a subsample of total catch.
7) For cruises G01-3 and G02-2 field identifications of juvenile salmon were inconsistent. Pink, chum, and sockeye, therefore, are all grouped under salmon, unidentified juvenile, as noted in the comment column.

Data Collector/Primary Contact (for more information):
Lewis J. Haldorson
Fisheries Division
University of Alaska, Fairbanks
11120 Glacier Highway
Juneau, AK 99801
lew.haldorson@uaf.edu
Phone: 907-465-6446
FAX: 907-465-6447

Secondary Contact:
Jack Piccolo
UAF / SFOS
11120 Glacier Highway
Juneau, AK 99801
ftjjp1@uaf.edu
Phone: 907-796-2055

Nordic 264 surface rope trawl (198-m long, 25-m wide, 35-m vertical height, equipped with a 1.2-cm mesh liner in cod end) towed at the surface. Start times for trawls are when all warp wire and doors have been let out, and end times are when warp wire retrival begins i. Numbers of fish caught from an event listed in this file may not match the count of number of fish measured in the 'Glength_September_2005' file because in some cases the number of fish measured was a subsample of total catch. For cruises G01-3 and G02-2 field identifications of juvenile salmon were inconsistent. Pink, chum, and sockeye, therefore, are all grouped under salmon, unidentified juvenile, as noted in the comment column.

BCO-DMO data manager processing notes:
* Version 2 (2021-05-18) replaces version 1 (2006-09-20).   There was an unsupported character in the source file now fixed after the encoding conversion to utf-8. 

Program in a Nutshell

Goal: To understand the effects of climate variability and climate change on the distribution, abundance and production of marine animals (including commercially important living marine resources) in the eastern North Pacific. To embody this understanding in diagnostic and prognostic ecosystem models, capable of capturing the ecosystem response to major climatic fluctuations.

Approach: To study the effects of past and present climate variability on the population ecology and population dynamics of marine biota and living marine resources, and to use this information as a proxy for how the ecosystems of the eastern North Pacific may respond to future global climate change. The strong temporal variability in the physical and biological signals of the NEP will be used to examine the biophysical mechanisms through which zooplankton and salmon populations respond to physical forcing and biological interactions in the coastal regions of the two gyres. Annual and interannual variability will be studied directly through long-term observations and detailed process studies; variability at longer time scales will be examined through retrospective analysis of directly measured and proxy data. Coupled biophysical models of the ecosystems of these regions will be developed and tested using the process studies and data collected from the long-term observation programs, then further tested and improved by hindcasting selected retrospective data series.

U.S. GLOBEC (GLOBal ocean ECosystems dynamics) is a research program organized by oceanographers and fisheries scientists to address the question of how global climate change may affect the abundance and production of animals in the sea.

The U.S. GLOBEC Program currently had major research efforts underway in the Georges Bank / Northwest Atlantic Region, and the Northeast Pacific (with components in the California Current and in the Coastal Gulf of Alaska). U.S. GLOBEC was a major contributor to International GLOBEC efforts in the Southern Ocean and Western Antarctic Peninsula (WAP).