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West Coast Vancouver Island Synoptic Bottom Trawl Survey

Catch, effort, location (latitude, longitude), relative abundance indices, and associated biological data from groundfish multi-species bottom trawl surveys in West Coast Vancouver Island.

Introduction

The West Coast Vancouver Island (WCVI) synoptic bottom trawl survey was first conducted in 2004, The survey was repeated every even year until 2018. The 2020 survey was postponed to 2021 due to the COVID-19 pandemic. This survey is one of a set of long-term and coordinated surveys that together cover the continental shelf and upper slope of most of the British Columbia coast. The other surveys are the Queen Charlotte Sound (QCS) survey, the Hecate Strait (HS) survey, the West Coast Haida Gwaii (WCHG) survey, and the Strait of Georgia (SOG) survey. The objectives of these surveys are to provide fishery-independent abundance indices of all demersal fish species available to bottom trawling and to collect biological samples of selected species. The survey follows a random depth-stratified design and the sampling units are 2 km by 2 km blocks.

The synoptic bottom trawl surveys are conducted by Fisheries and Oceans Canada (DFO) in collaboration with the Canadian Groundfish Research and Conservation Society (CGRCS), a non-profit society composed of participants in the British Columbia commercial groundfish trawl fishery. The Queen Charlotte Sound and West Coast Haida Gwaii surveys are conducted under collaborative agreements, with the CGRCS providing chartered commercial fishing vessels and field technicians, while DFO provides in-kind contributions for running the surveys including personnel and equipment. The Hecate Strait, West Coast Vancouver Island, and Strait of Georgia surveys are conducted by DFO and have typically taken place on a Canadian Coast Guard research vessel. Until 2016 this vessel was the CCGS W.E. Ricker. From 2021 onwards, this vessel was the CCGS Sir John Franklin. In years when a coast guard vessel has not been available, The Hecate Strait, West Coast Vancouver Island, and Strait of Georgia surveys have taken place on chartered industry vessels. Data from these surveys are also presented in the groundfish data synopsis report (Anderson et al. 2019).

Effort

This table contains information about the survey trips and fishing events (trawl tows/sets) that are part of this survey series. Trip-level information includes the year the survey took place, a unique trip identifier, the vessel that conducted the survey, and the trip start and end dates (the dates the vessel was away from the dock conducting the survey). Set-level information includes the date, time, location, and depth that fishing took place, as well as information that can be used to calculate fishing effort (duration) and swept area. All successful fishing events are included, regardless of what was caught.

Catch

This table contains the catch information from successful fishing events. Catches are identified to species or to the lowest taxonomic level possible. Most catches are weighed, but some are too small (“trace” amounts) or too large (e.g. very large Big Skate). The unique trip identifier and set number are included so that catches can be related to the fishing event information (including capture location).

Biology

This table contains the available biological data for catches which were sampled. Data may include any or all of length, sex, weight, age. Different length types are measured depending on the species. Age structures are collected when possible for species where validated aging methods exist and are archived until required for an assessment; therefore, all existing structures have not been aged at this time. The unique trip identifier and set number are included so that samples can be related to the fishing event and catch information.

Biomass

This table contains relative biomass indices of species that have been captured in every survey of the time series. The coefficient of variation and bootstrapped 95% confidence intervals are provided for each index. The groundfish data synopsis report (Anderson et al. 2019) provides an explanation of how the relative biomass indices are derived.

Simple

Date ( RI_366 )
2018-01-25
Date ( RI_368 )
2020-06-03
Date ( RI_367 )
2018-07-13
Date ( RI_368 )
2022-11-15
Date ( RI_368 )
2023-08-23
RI_410
  Government of Canada; Fisheries and Oceans Canada; Pacific Science/Ecosystems and Oceans Science/Stock Assessment and Research - Shelee Hamilton ( Head - Fishery & Assessment Data Section )
Pacific Biological Station, 3190 Hammond Bay Road , Nanaimo , British Columbia , V9T 6N7 , Canada
1 (250) 739-9890
RI_409
  Government of Canada; Fisheries and Oceans Canada; Pacific Science/Ecosystems and Oceans Science/Stock Assessment and Research - Maria Cornthwaite ( Program Head - Groundfish Data Unit )
Pacific Biological Station, 3190 Hammond Bay Road , Nanaimo , British Columbia , V9T 6N7 , Canada
1 (778) 268-2739
Status
onGoing; enContinue RI_596
Maintenance and update frequency
annually; annuel RI_539
Keywords ( RI_525 )
  • Pacific Ocean
  • North Pacific
  • British Columbia
  • West Coast Vancouver Island
Keywords ( RI_528 )
  • Bottom Trawl
  • Groundfish
  • Fishery Independent Data
  • Relative Abundance
  • Relative Biomass
  • Canadian Groundfish Research and Conservation Society
  • CGRCS
  • Collaborative Agreement
  • Commercial Species
  • Stock Assessment
Government of Canada Core Subject Thesaurus Thésaurus des sujets de base du gouvernement du Canada ( RI_528 )
  • Surveys
  • Oceans
  • Resources management
  • Fisheries
  • Marine biology
  • Fish
Classification
unclassified; nonClassifié RI_484
Use limitation
Open Government Licence - Canada (http://open.canada.ca/en/open-government-licence-canada)
Access constraints
license; licence RI_606
Use constraints
license; licence RI_606
Spatial representation type
textTable; texteTable RI_637
Metadata language
eng
Character set
utf8; utf8 RI_458
Topic category
  • Biota
  • Oceans
Begin date
2004-01-01
End date
2021-12-31
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S
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W
thumbnail


Reference system identifier
https://epsg.io / EPSG:4326 /
Distribution format
  • CSV ( 1 )

  • HTML ( 1 )

RI_412
  Government of Canada; Fisheries and Oceans Canada; Pacific Science/Ecosystems and Oceans Science/Stock Assessment and Research - Maria Cornthwaite ( Program Head - Groundfish Data Unit )
Pacific Biological Station,3190 Hammond Bay Road , Nanaimo , British Columbia , V9T 6N7 , Canada
1 (778) 268-2739
OnLine resource
Data Dictionary ( HTTPS )

Supporting Document;HTML;eng,fra

OnLine resource
Reference Information - Synoptic Bottom Trawl Surveys ( HTTPS )

Supporting Document;HTML;eng,fra

OnLine resource
Survey Summaries - West Coast Vancouver Island ( HTTPS )

Supporting Document;HTML;eng,fra

OnLine resource
West Coast Vancouver Island Synoptic Bottom Trawl Survey ( HTTPS )

Dataset;CSV;eng

OnLine resource
West Coast Vancouver Island Synoptic Bottom Trawl Survey (French) ( HTTPS )

Dataset;CSV;fra

OnLine resource
West Coast Vancouver Island Synoptic Bottom Trawl Survey ( ESRI REST: Map Service )

Web Service;ESRI REST;eng

OnLine resource
West Coast Vancouver Island Synoptic Bottom Trawl Survey ( ESRI REST: Map Service )

Web Service;ESRI REST;fra

File identifier
557e42ae-06fe-426d-8242-c3107670b1de XML
Metadata language
eng; CAN
Character set
utf8; utf8 RI_458
Parent identifier
Groundfish Synoptic Bottom Trawl Surveys a278d1af-d567-4964-a109-ae1e84cbd24a
Hierarchy level
dataset; jeuDonnées RI_622
Date stamp
2025-02-06T12:39:17.837Z
Metadata standard name
North American Profile of ISO 19115:2003 - Geographic information - Metadata
Metadata standard version
CAN/CGSB-171.100-2009
RI_414
  Government of Canada; Fisheries and Oceans Canada; Pacific Science/Ecosystems and Oceans Science/Stock Assessment and Research - Maria Cornthwaite ( Program Head - Groundfish Data Unit )
Pacific Biological Station, 3190 Hammond Bay Road , Nanaimo , British Columbia , V9T 6N7 , Canada
1 (778) 268-2739
 
 

Overviews

overview
West Coast Vancouver Island Thumbnail

Spatial extent

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Keywords


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