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West Coast Haida Gwaii 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 Haida Gwaii. Introduction The West Coast Haida Gwaii (WCHG) synoptic bottom trawl survey was first conducted annually from 2006 to 2008 and has since been repeated every second year on even numbered years. 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 Vancouver Island (WCVI) 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 the Canadian Coast Guard research vessel W.E. Ricker. In years when the W.E. Ricker has not been available, the Hecate Strait and West Coast Vancouver Island 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. Note that we do not calculate a biomass index for the 2014 West Coast Haida Gwaii survey, as this survey was incomplete due to operational problems. 2020-12-09 Fisheries and Oceans Canada shelee.hamilton@dfo-mpo.gc.ca Nature and EnvironmentScience and TechnologyPacific OceanNorth PacificBritish ColumbiaWest Coast Haida GwaiiBottom TrawlGroundfishFishery Independent DataRelative AbundanceRelative BiomassCanadian Groundfish Research and Conservation SocietyCGRCSCollaborative AgreementCommercial SpeciesStock AssessmentOceansFishMarine biologyFisheriesSurveysResources management Data DictionaryHTML https://pacgis01.dfo-mpo.gc.ca/FGPPublic/Groundfish_Synoptic_Trawl_Surveys/West_Coast_HG/data_dictionaryHG.html Reference Information - Synoptic Bottom Trawl SurveysHTML https://pacgis01.dfo-mpo.gc.ca/FGPPublic/Groundfish_Synoptic_Trawl_Surveys/West_Coast_HG/reference_informationHG.html Survey Summaries - West Coast Haida GwaiiHTML https://pacgis01.dfo-mpo.gc.ca/FGPPublic/Groundfish_Synoptic_Trawl_Surveys/West_Coast_HG/survey_summaries.html West Coast Haida Gwaii Synoptic Bottom Trawl SurveyCSV https://pacgis01.dfo-mpo.gc.ca/FGPPublic/Groundfish_Synoptic_Trawl_Surveys/West_Coast_HG/english.zip West Coast Haida Gwaii Synoptic Bottom Trawl SurveyCSV https://pacgis01.dfo-mpo.gc.ca/FGPPublic/Groundfish_Synoptic_Trawl_Surveys/West_Coast_HG/french.zip Data DictionaryCSV https://pacgis01.dfo-mpo.gc.ca/FGPPublic/Groundfish_Synoptic_Trawl_Surveys/Groundfish_synoptic_surveys_data_dictionary.csv West Coast Haida Gwaii Synoptic Bottom Trawl SurveyESRI REST https://gisp.dfo-mpo.gc.ca/arcgis/rest/services/FGP/Groundfish_Synoptic_Bottom_Trawl_Surveys_WCHG/MapServer/0 West Coast Haida Gwaii Synoptic Bottom Trawl SurveyESRI REST https://gisp.dfo-mpo.gc.ca/arcgis/rest/services/FGP/Groundfish_Synoptic_Bottom_Trawl_Surveys_WCHG/MapServer/1

West Coast Haida Gwaii 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 Haida Gwaii.

Introduction

The West Coast Haida Gwaii (WCHG) synoptic bottom trawl survey was first conducted annually from 2006 to 2008 and has since been repeated every second year on even numbered years. 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 Vancouver Island (WCVI) 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 the Canadian Coast Guard research vessel W.E. Ricker. In years when the W.E. Ricker has not been available, the Hecate Strait and West Coast Vancouver Island 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. Note that we do not calculate a biomass index for the 2014 West Coast Haida Gwaii survey, as this survey was incomplete due to operational problems.

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Resources

Resource Name Resource Type Format Language Links
Data Dictionary Guide HTML English
French
Access
Reference Information - Synoptic Bottom Trawl Surveys Guide HTML English
French
Access
Survey Summaries - West Coast Haida Gwaii Guide HTML English
French
Access
West Coast Haida Gwaii Synoptic Bottom Trawl Survey Dataset CSV English Access
West Coast Haida Gwaii Synoptic Bottom Trawl Survey Dataset CSV French Access
Data Dictionary Guide CSV English
French
Access
West Coast Haida Gwaii Synoptic Bottom Trawl Survey Web Service ESRI REST English Access
West Coast Haida Gwaii Synoptic Bottom Trawl Survey Web Service ESRI REST French Access

Geographic Information

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Contact Information

Delivery Point: Pacific Biological Station, 3190 Hammond Bay Road

City: Nanaimo

Administrative Area: British Columbia

Postal Code: V9T 6N7

Country: Canada

Electronic Mail Address: maria.cornthwaite@dfo-mpo.gc.ca

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