Known concentration areas of the Stimpson's surfclam in the Estuary and the Gulf of St. Lawrence - CSV from https://open.canada.ca/data/en/dataset/8bb29ee0-6cd8-4dd4-abe0-afe8682a69d9

Stimpson's surfclam or Arctic surfclam (Mactromeris polynyma) concentration areas in this layer are described as being known and commercially exploited historically and/or currently. The mapping of these areas is based on several sources of information: exploratory fisheries, scientific surveys and fishermen's logbooks. Commercial fishery data come from three distinct sources of information: the purchase receipt, the fishermen's logbook and commercial sampling by Fisheries and Oceans Canada (DFO). All data comes from the research document published in 2015. These concentration areas are considered among the most abundant and are used for commercial fishing (note: high densities are not found strictly in these beds).

This dataset does not represent the general distribution of the species nor the extent to which fishing is allowed. The extent of shellfish beds can change over time in response to, among others, harvesting and recruitment rates. The polygons might underestimate the concentration areas because fishing and sampling occur where the target resource is known to be more abundant. However, the precision is good enough for resource protection and management needs in case of an environmental incident. This information is valid until data from a most recent research survey is published.

Data sources and references :

DFO. 2007. Évaluation des stocks de quahog nordique (Arctica islandica) du banc de l'île de Sable et de la baie St. Mary's, et du stock de mactre de Stimpson (Mactromeris polynyma) du Banquereau. Secr. can. de consult. sci. du MPO. Avis sci. 2007/034 (Révisé).

Lambert J. et P. Goudreau. 1997. Biologie et exploitation de la mactre de Stimpson (Mactromeris polynyma) sur les côtes du Québec. Sec. can. éval. stock du MPO. Doc. rech. 1997/101. 44 p.

Landry, T.E., E. Wade, E. et M. Giguère. 1992. Évaluation des gisements de mactre de Stimpson, Mactromeris polynyma, dans le golfe du Saint-Laurent: résultats préliminaires. MPO, CSCPCA Doc. rech. 1992/086. 29 p.

Trottier, S. et P. Goudreau. 2015. Évaluation des stocks de mactre de Stimpson (Mactromeris polynyma) des eaux côtières du Québec en 2014. Secr. can. de consult. sci. du MPO. Doc. de rech. 2016/063. Ix + 72 p.

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	48c7600c-49f0-4db3-919a-a30306e321ff
Package id	a2688be9-0716-4409-bbfa-77bda4766366
Position	0
State	active

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