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Eulachon Migration Study Bottom Trawl Surveys - South

Catch, effort, location (latitude and longitude), and associated biological data from the Eulachon Migration Study Bottom Trawl surveys - South on the coast of British Columbia.

Introduction:

The Eulachon Migration Study Bottom Trawl survey - South (Eul-S) is part of the in the Eulachon Migration Study Bottom Trawl survey series and took place on the coast of British Columbia. The other survey in this series is the Eulachon Migration Study Bottom Trawl survey – North (Eul-N).

The Eulachon Migration Study Bottom Trawl survey - South (Eul-S) was conducted monthly from October 2017 to March 2018 with an additional trip in January 2019 and was funded by the Fisheries and Oceans Canada (DFO) National Rotational Survey Fund.

The objective of this survey was learn about the distribution, ecology, and migration times of Eulachon into the Fraser River by observing their spatial and temporal occurrence and biological condition over a wide survey region and over several months. This survey follows a random block design in a targeted depth range between 80 – 200 metres. The sampling units are 2 km by 2 km blocks.

Fishing was conducted using the Canadian Coast Guard Research Vessel Neocaligus to tow an American shrimp trawl net (Cantrawl Nets Ltd., Richmond, BC). The horizontal opening of the polypropylene net was estimated to be 34 to 37 feet (10 to 11 m), while the center of the opening had a vertical height of approximately 7 to 9 feet (2 to 3 m). A 0.4” (10 mm) liner was used in the codend. The net was configured with roller gear and 72” (1.8 m) Thyboron Type 2 trawl doors. Tow duration was typically 20 minutes. The standard hours of fishing were 0700 to 1700 hours, depending on sunrise and sunset in winter months.

The Eulachon Migration Study Bottom Trawl survey – South was conducted by the Department of Fisheries and Oceans Canada (DFO). The area the survey covered included the Strait of Georgia, Juan de Fuca Strait, and Haro Strait in Pacific Fishery Management areas (PFMA’s) 17-20, 28, 29, and 121.

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 Eulachon biological data including length, sex, and weight. Information is provided on whether stomachs or teeth were examined, and whether genetics (DNA) samples were collected. Eulachon maturity data, diet data, and teeth presence data are available on request from the data contacts. Additional analyses are ongoing, including histology, fatty acid profiling, and genetic analysis; frozen heads are also available for a future aging project. In addition to the Eulachon biological data, lengths and weights were collected from American Shad. The unique trip identifier and set number are included so that samples can be related to the fishing event and catch information.

Simple

Date ( RI_367 )
2021-03-31
Date ( RI_366 )
2021-02-17
RI_410
  Government of Canada;Fisheries and Oceans Canada;Science - Sean MacConnachie ( Section Head - Aquatic Ecosystem and Marine Mammal Science )
Pacific Biological Station, 3190 Hammond Bay Road , Nanaimo , British Columbia , V9T 6N7 , Canada
1 (250) 756-7223
RI_409
  Government of Canada;Fisheries and Oceans Canada;Science - Vanessa Hodes ( Biologist – Nearshore Ecosystem )
Pacific Biological Station, 3190 Hammond Bay Road , Nanaimo , British Columbia , V9T 6N7 , Canada
1 (250) 756-7219
RI_409
  Government of Canada;Fisheries and Oceans Canada;Science - Lindsay Dealy ( Aquatic Science Technician - Aquatic Ecosystems and Marine Mammals )
Pacific Biological Station, 3190 Hammond Bay Road , Nanaimo , British Columbia , V9T 6N7 , Canada
1 (250) 756-7134
Status
completed; complété RI_593
Maintenance and update frequency
notPlanned; nonPlanifié RI_542
Keywords ( RI_528 )
  • Bottom Trawl
  • Eulachon
  • Life History
  • Migration
  • Diet
  • Maturity
  • Teeth
  • National Rotational Survey Fund
  • Catch
  • Distribution
Keywords ( RI_525 )
  • Pacific Ocean
  • North Pacific
  • British Columbia
Government of Canada Core Subject Thesaurus Thésaurus des sujets de base du gouvernement du Canada ( RI_528 )
  • Surveys
  • Fisheries
  • Oceans
  • Fish
  • Marine biology
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
grid; grille RI_636
Metadata language
eng; CAN
Character set
utf8; utf8 RI_458
Topic category
  • Biota
  • Oceans
Begin date
2017
End date
2019
N
S
E
W
thumbnail


Reference system identifier
http://www.epsg-registry.org / EPSG:4326 /
Distribution format
  • CSV ( Unknown )

  • HTML ( Unknown )

RI_412
  Government of Canada;Fisheries and Oceans Canada;Science - 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
References ( HTTPS )

Supporting Document;HTML;eng,fra

OnLine resource
Eulachon Migration Study Bottom Trawl Surveys - South ( HTTPS )

Dataset;CSV;eng

OnLine resource
Eulachon Migration Study Bottom Trawl Surveys - South ( HTTPS )

Dataset;CSV;fra

OnLine resource
Eulachon Migration Study Bottom Trawl Surveys - South ( ESRI REST: Map Server )

Web Service;ESRI REST;eng

OnLine resource
Eulachon Migration Study Bottom Trawl Surveys - South ( ESRI REST: Map Server )

Web Service;ESRI REST;fra

File identifier
447ac544-d8b1-4cf3-8f33-b279043f7646 XML
Metadata language
eng; CAN
Character set
utf8; utf8 RI_458
Parent identifier
Eulachon Migration Study Bottom Trawl Surveys 023ffddc-ecf9-438e-bb8f-e91dfb935e6a
Hierarchy level
series; série RI_623
Date stamp
2025-02-06T00:02:28.795Z
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;Science - 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
Thumbnail_image_Eulachon_MSBTS_South.png

Spatial extent

N
S
E
W
thumbnail


Keywords


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Associated resources

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