Annual multidisciplinary survey for assessing groundfish and shrimp in the Estuary and northern Gulf of St. Lawrence (CCGS Teleost 2004 - 2022) - CSV from https://open.canada.ca/data/en/dataset/40381c35-4849-4f17-a8f3-707aa6a53a9d

Fisheries and Oceans Canada (DFO) conducts an annual summer multidisciplinary scientific survey with a bottom trawl in the Estuary and the northern Gulf of St. Lawrence since 1984. Over the years this survey has been conducted on four vessels: the MV Lady Hammond (1984-1990), the CCGS Alfred Needler (1990-2005), the CCGS Teleost (2004-2022) and the CCGS Cabot (2022-present). 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. However, comparative analyses have been carried out between vessels, and conversion factors are available on request for a number of species. The specificities of the missions onboard the CCGS Teleost are described below.

Objectives:

Assess groundfish and northern shrimp population abundance and condition
Assess environmental conditions
Conduct a biodiversity inventory of benthic and demersal megafauna
Assess phytoplankton and mesozooplankton abundance
Monitor the pelagic ecosystem
Inventory marine mammals populations
Inventory seabirds populations
Collect samples for various research projects

Survey description

The survey covers the Estuary and the northern Gulf of St. Lawrence, that is the divisions 4R, 4S and the northern part of division 4T of the Northwest Atlantic Fisheries Organization (NAFO). Since 2008, coverage of division 4T has been increased in the upstream part of the Lower Estuary in order to sample the depths between 37 and 183 m. A stratified random sampling strategy is used for this survey and the area of the study area is 118,587 km². The fishing gear used on the CCGS Teleost is a four-sided Campelen 1800 shrimp trawl equipped with a Rockhopper footgear (“bicycle”). The trawl lengthening and codend are equipped with a 12.7-mm knotless nylon lining. Standard trawling tows last 15 minutes, starting from the time the trawl touches the sea floor. The target towing speed is 3 knots.

Data

For each fishing tow, the catch is sorted and weighed by taxa; individuals are then counted and biological data are collected on a subsample. For fish, crab and squid, size and weight are measured 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 sampled for several species such as Atlantic cod, Atlantic halibut, Greenland halibut, and witch flounder. 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 biological data are divided into 4 files: a “Metadata” file containing set information, a “Catches” file containing catches per set for fish taxa, a “Biological characteristics” file containing morphometric measurements per individual and a “Shrimps” file containing information on shrimp catches. This data is also available via the 'Biodiversity' application on the St. Lawrence Global Observatory (SLGO).

It's important to note that this is raw data. Only set considered successful are retained. In each set, all species are kept, with a few exceptions. For more information please contact the data management team (gddaiss-dmsaisb@dfo-mpo.gc.ca).

Champ	Valeur
Dernière modification de la donnée	16 janvier 2026
Dernière modification de la métadonnée	16 janvier 2026
Créé le	16 janvier 2026
Format	CSV
Licence	License not specified
Datastore active	False
Has views	False
Id	908433c7-e0d2-43d5-844f-02fcb1c1e239
Package id	842f7c3b-25f5-4c3e-bfd3-6aa602be656a
Position	0
State	active

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