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Evaluation of groundfish and shrimp annual multidisciplinary survey in the Estuary and northern Gulf of St. Lawrence (CCGS Alfred Needler 1990 - 2005)

Fisheries and Oceans Canada (DFO) conducts an annual multidisciplinary scientific survey with a bottom trawl in the Estuary and the northern Gulf of St. Lawrence since 1978. Over the years this survey has been conducted on four vessels: the MV Gadus Atlantica (1978-1994), the MV Lady Hammond (1984-1990), the CCGS Alfred Needler (1990-2005) and the CCGS Teleost (2004-2021). It is important to note that the objectives, the methods used and the identification of the species during these surveys have improved over time in response to DFO requests and mandates. The data are therefore not directly comparable between these surveys. The specificities of the missions onboard the CCGS Alfred Needler are described below.

Objectives:

1. Assess groundfish and northern shrimp population abundance and condition

2. Assess environmental conditions

3. Inventory species biodiversity

4. Monitor the pelagic ecosystem

5. Inventory marine mammals populations

6. Inventory seabirds populations

7. Collect samples for various research projects

Survey description

The survey covers the divisions 4R, 4S, 3Pn and the northern part of division 4T of the Northwest Atlantic Fisheries Organization (NAFO). This survey follows a stratified random sampling design and the fishing gear used on the CCGS Alfred Needler is a URI shrimp trawl (81'/114'). Standard trawling tows last 25 minutes, starting from the time the trawl touched the sea floor. Towing speed is 3 knots.

Data

For each fishing tow, the catch is sorted and weighed by taxa; biological data are then

collected on a subsample. For fish, crab and squid, size and weight are gathered by individual and, for some species, sex, gonad maturity, and the weight of certain organs (stomach, liver, gonads) are also evaluated. The soft rays of the anal fin are counted for redfish, and the otoliths are collected for several species such as witch flounder, Atlantic cod, Greenland halibut and Atlantic halibut. A roughly 2-kg shrimp sample is sorted and weighed by species (and by stage of maturity for northern shrimp). The shrimps are measured individually. The other invertebrates are counted (no individual measurements) and photographed.

The catches per tow for fish taxa are available below. This data is also available via the 'Biodiversity' application on the St. Lawrence Global Observatory (SLGO). For more information please contact the data management team (gddaiss-dmsaisb@dfo-mpo.gc.ca ).

Simple

Date ( RI_367 )
2019
Date ( RI_366 )
2019
Date ( RI_368 )
2021-12-10
RI_416
  Government of Canada; Fisheries and Oceans Canada;Sciences/SAISB - Section Gestion de données - Direction des avis, information et soutien scientifiques / Data Management Section - Scientific Advice, Information and Support Branch ( )
850, route de la Mer, P.O. Box 1000 , Mont-Joli , Quebec , G5H 3Z4 , Canada
Status
completed; complété RI_593
Maintenance and update frequency
asNeeded; auBesoin RI_540
Keywords ( RI_525 )
  • St. Lawrence Estuary
  • Gulf of St. Lawrence
Keywords ( RI_530 )
  • Groundfish, Shrimp, Multidisciplinary survey, Needler
Government of Canada Core Subject Thesaurus Thésaurus des sujets de base du gouvernement du Canada ( RI_528 )
  • Aquatic ecosystems
  • Fish
  • Fisheries management
  • Oceans
  • Marine biology
  • Aquatic wildlife
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
vector; vecteur RI_635
Metadata language
fra; CAN
Metadata language
eng; CAN
Character set
utf8; utf8 RI_458
Topic category
  • Biota
Begin date
1990
End date
2005
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Reference system identifier
http://www.epsg-registry.org / EPSG:4326 /
Distribution format
  • CSV ( unknown )

RI_414
  Government of Canada; Fisheries and Oceans Canada;Sciences/SAISB - Section Gestion de données - Direction des avis, information et soutien scientifiques / Data Management Section - Scientific Advice, Information and Support Branch ( )
850, route de la Mer, P.O. Box 1000 , Mont-Joli , Quebec , G5H 3Z4 , Canada
OnLine resource
Biodiversity application ( HTTPS )

Application;HTML;eng,fra

OnLine resource
Alfred Needler Data Map ( ESRI REST: Map Server )

Web Service;ESRI REST;eng,fra

OnLine resource
Alfred Needler Data Map ( ESRI REST: Map Server )

Web Service;ESRI REST;eng,fra

OnLine resource
Data dictionary ( HTTPS )

Supporting Document;CSV;eng,fra

OnLine resource
Alfred Needler data ( HTTPS )

Dataset;CSV;eng,fra

File identifier
4eaac443-24a8-4b37-9178-d7cce4eb7c7b XML
Metadata language
eng; CAN
Character set
utf8; utf8 RI_458
Hierarchy level
dataset; jeuDonnées RI_622
Date stamp
2022-03-17T18:17:09
Metadata standard name
North American Profile of ISO 19115:2003 - Geographic information - Metadata
Metadata standard version
CAN/CGSB-171.100-2009
RI_418
  Government of Canada; Fisheries and Oceans Canada;Sciences/SAISB - Section Gestion de données - Direction des avis, information et soutien scientifiques / Data Management Section - Scientific Advice, Information and Support Branch ( )
850, route de la Mer, P.O. Box 1000 , Mont-Joli , Quebec , G5H 3Z4 , Canada
 
 

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Keywords


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