NAFO Division 4T groundfish research vessel trawl survey (September Survey) dataset

Tow, catch, length frequency, and biological information for fish caught during the annual September research vessel trawl surveys in the southern Gulf of St. Lawrence (NAFO Division 4T). Abundance indices and spatial distribution patterns of commercial and non-commercial groundfish.

Date ( RI_366 ): 1970-09-07

Date ( RI_367 ): 2020-01-19

Date ( RI_368 ): 2022-05-31

RI_409

Government of Canada; Fisheries and Oceans Canada - Daniel Ricard ( Biologist, Aquatic Resources Division )

343 Université Ave , Moncton , New Brunswick , E1C 5K4 , Canada

506-851-6216

RI_409

Government of Canada; Fisheries and Oceans Canada - Pablo Vergara ( Aquatic Science Biologist – Data manager )

343 Université Ave , Moncton , New Brunswick , E1C 5K4 , Canada

506-851-2369

Purpose: Each September since 1971, a standardized research vessel bottom-trawl survey has been conducted in the southern Gulf of St. Lawrence (NAFO Division 4T). The primary objective of this survey is to obtain abundance indices for the major groundfish resources in the area. The research survey provides a fisheries-independent source of information about all marine living organisms that are captured by the survey trawl in the southern Gulf of St. Lawrence.

Status: onGoing; enContinue RI_596

Maintenance and update frequency: annually; annuel RI_539

uncontrolled vocabulary; user-specified vocabulaire libre; spécifié par l'utilisateur ( RI_528 )

Length-Frequency Measurements

NASA/Global Change Master Directory (GCMD) Science Keywords Version 6.0.0.0.0 NASA/Global Change Master Directory (GCMD) Science Keywords Version 6.0.0.0.0 ( RI_528 )

Fisheries
NISKIN BOTTLES
Trawl

Integrated Taxonomic Information System (ITIS) Système d'information taxonomique intégré (SITI) ( RI_528 )

Amblyraja radiata
Anarhichas lupus
Artediellus atlanticus
Clupea harengus
Cottidae
Enchelyopus cimbrius
Gadus ogac
Glyptocephalus cynoglossus
Hemitripterus americanus
Hippoglossus hippoglossus
Icelus spatula
Leucoraja ocellata
Limanda ferruginea
Malacoraja senta
Mallotus villosus
Myoxocephalus octodecemspinosus
Myoxocephalus scorpioides
Myoxocephalus scorpius
Myxine glutinosa
Osmerus mordax mordax
Phycis chesteri
Scomber scombrus
Scophthalmus aquosus
Squalus acanthias
Tautogolabrus adspersus
Triglops murrayi
Urophycis tenuis

Government of Canada Core Subject Thesaurus Thésaurus des sujets de base du gouvernement du Canada ( Theme )

Crustaceans
Fish
Fisheries
Molluscs
Oceans
Salt water fish

DFO Areas Zones du MPO ( RI_525 )

Gulf of St. Lawrence

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

Use limitation: Please contact the data custodians before attempting to use this information in support of any kind of ecological analyses related to catch rates or biodiversity.

Use limitation: No limitations

Classification: unclassified; nonClassifié RI_484

Spatial representation type: textTable; texteTable RI_637

Metadata language: eng; CAN

Character set: utf8; utf8 RI_458

Topic category

Biota

Begin date: 1971-09-07

Description: NAFO Division 4T

Supplemental Information: PARAMETERS COLLECTED:

abundance estimates (ecological); distribution (ecological); species counts (ecological); gear (fishing); vessel information (fishing); point (spatial)

NOTES ON QUALITY CONTROL:

Scientific names listed in the survey species list have been mapped to recognized standards - marine taxa have been mapped to the World Register of Marine Species (WoRMS) using their online taxon match tool. All sampling locations were plotted on a map to perform a visual check confirming that the latitude and longitude coordinates were within the described sampling area.

In 2003, because of a fire aboard the Alfred Needler, the Wilfred Templeman was used for the survey. However, no comparative fishing experiments have been conducted between the Alfred Needler and the Wilfred Templeman. We are therefore unable to integrate the indices derived for 2003 to the remainder of the survey time-series.

SAMPLING METHODS:

Sampling Method: Hurlbut, T., and D. Clay. 1990. Protocols for research vessel cruises within the Gulf Region (demersal fish) (1970-1987). Can. Manuscr. Rep. Fish. Aquat. Sci. 2082: 143 p. Available online http://www.dfo-mpo.gc.ca/Library/115732.pdf [Accessed on 20190417]

Parameters: bottom water temperature -length, weight, sex, maturity, and age of selected individuals, tow, catch, length frequency, and biological information for fish caught

Organisms: groundfish, pelagics, invertebrates

CITATION LIST:

Chouinard, G.A.; LeBlanc, C.; Hurlbut, T.; Morin, R.B.; Swain, D.P.; Currie, L.; Poirier, G.A.; Benoît, H.P.. 2006. Preliminary Results from the September 2005 Bottom-trawl Survey of the Southern Gulf of St. Lawrence.. CSAS Research Document 2006/007.

Swain, D.P., Benoît, H.P., & Hammill, M.O. 2015. Spatial distribution of fishes in a northwest Atlantic ecosystem in relation to risk of predation by a marine mammal. Journal of Animal Ecology 84(5):1286-98.

Swain, D.P. & Benoît, H.P.. 2015. Extreme increases in natural mortality prevent recovery of collapsed fish populations in a Northwest Atlantic ecosystem. Marine Ecology Progress Series 519, 165-182.