{ "culture": "en-CA", "name": "Demersal_Fish_Biomass_Teleost", "guid": "AB604840-07EC-4D6A-A77F-2B2B71CB7909", "catalogPath": "", "snippet": "Mean demersal fish total biomass for the past 10 years in the Estuary and Gulf of St.Lawrence obtained by summing the fish biomass (kg) for all species for a tow and then averaging tows in each grid cell 10 km x 10 km. Input data are from the annual August (north) and September (south) multidisciplinary surveys. A distinct layer by survey is presented because the total biomasses are not comparable from one survey to the other (different fishing gears for each one). / Moyenne, pour les dix dernières années, de la biomasse totale des poissons démersaux dans l'estuaire et le golfe du St-Laurent obtenue en combinant la biomasse (kg) de toutes les espèces pour un trait de chalut, puis en moyennant les traits sur chaque cellule d'une grille 10 km x 10 km. Les données proviennent des relevés multidisciplinaires effectués en août (nord) et septembre (sud). Une couche distincte par relevé est présentée parce que les biomasses totales ne sont pas comparables d\u2019un relevé à l\u2019autre (engins de pêche différents pour chacun).", "description": "
Mean demersal fish total biomass for the past 10 years in the Estuary and Gulf of St.Lawrence obtained by summing the fish biomass (kg) for all species for a tow and then averaging tows in each grid cell 10 km x 10 km. Input data are from the annual August (north) and September (south) multidisciplinary surveys. A distinct layer by survey is presented because the total biomasses are not comparable from one survey to the other (different fishing gears for each one). <\/SPAN><\/P> Purpose<\/SPAN><\/P> Since 1990, the Department of Fisheries and Oceans has been conducting an annual multidisciplinary survey in the Estuary and northern Gulf of St. Lawrence using a standardized protocol. In the southern Gulf of St. Lawrence, these bottom trawl surveys has been carrying out each September since 1971. These missions are an important source of information about the status of the marine ressources.<\/SPAN><\/P> The objectives of the surveys are multiple: <\/SPAN><\/P> to estimate the abundance and biomass of groundfish and invertebrates, to identify the spatial distribution and biological characteristics of these species, to monitor the biodiversity of the Estuary and Gulf and finally, to describe the environmental conditions observed in the area at the moment of the sampling.<\/SPAN><\/P> The southern Gulf surveys are realized using the following standardized protocol:<\/SPAN><\/P> Hurlbut,T. and D.Clay (eds) 1990. Protocols for Research Vessel Cruises within the Gulf Region (Demersal Fish) (1970-1987). Can. MS Rep. Fish. Aquat. Sci. No. 2082: 143p.<\/SPAN><\/P> The sampling protocols used for the Estuary and northern Gulf surveys are described in details in the following publications:<\/SPAN><\/P> Bourdages, H., Archambault, D., Bernier, B., Fréchet, A., Gauthier, J., Grégoire, F., Lambert, J., et Savard, L. 2010. Résultats préliminaires du relevé multidisciplinaire de poissons de fond et de crevette d\u2019août 2009 dans le nord du golfe du Saint-Laurent. Rapp. stat. can. sci. halieut. aquat. 1226 : xii+ 72 p. <\/SPAN><\/P> Bourdages, H., Archambault, D., Morin, B., Fréchet, A., Savard, L., Grégoire, F., et Bérubé, M. 2003. Résultats préliminaires du relevé multidisciplinaire de poissons de fond et de crevette d\u2019août 2003 dans le nord du golfe du Saint-Laurent. Secr. can. consult. sci. du MPO. Doc. rech. 2003/078. vi + 68 p.<\/SPAN><\/P> Annual reports are available at the Canadian Science Advisory Secretariat (CSAS), (http://www.dfo-mpo.gc.ca/csas-sccs/index-eng.htm).<\/SPAN><\/P>