Snow crab research trawl survey database (Southern Gulf of St. Lawrence, Gulf region, Canada) from 1988 to 2010Entry ID: OBIS.DFO_Gulf_SnowCrabSurveys
Abstract: The Southern Gulf of St. Lawrence snow crab bottom trawl survey has taken place yearly since 1988 with the exception of 1996 when partnerships with industry ceased and no funding was available. The survey is conducted after the local fisheries are closed from early to mid-July and ends in early to mid-September. For the survey, we used a Nephrops bottom trawl towed over the bottom during 5 minutes ... at a speed of approximately 2 knots. A scanmar (1989-1998) or netmind (1999-present) hydro-acoustic instrumentation system is used to monitor the status of the trawl, such as depth, trawl opening width and height. On board computer systems record the position, time and status of the trawl (Moriyasu et al, 1998). Throughout the years, the snow crab survey has covered an ever widening range of the Southern Gulf of St. Lawrence area. In 1989 for instance, there were 155 stations mostly within Area 12. Since then the survey has grown to cover all fishing grounds in the Southern Gulf of St. Lawrence (Area 12, E, F, and 19) with over 300 stations. Three successive boats have been used since the first survey. , The side trawler 'Emy Serge' from 1988 to 1998, followed by two stern trawlers, the 'Den C Martin' from1999 to 2002, and the 'Marco Michel' from 2003 to present. No boat comparisons were completed during the transitions. Because the fishing efficiency of the gear used is not yet known for snow crab, abundance is considered as relative compared to the absolute abundance.
Purpose: Trawl survey data used primarily for assessing the status of snow crab stocks in the southern Gulf of St. Lawrence.
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Data Set Citation
Dataset Originator/Creator: Wade, Elmer J.
Dataset Title: Snow crab research trawl survey database (Southern Gulf of St. Lawrence, Gulf region, Canada) from 1988 to 2010
Dataset Series Name: OBIS Canada Digital Collections
Dataset Release Date: 2011
Dataset Release Place: Bedford Institute of Oceanography, Dartmouth, Nova Scotia, Canada
Dataset Publisher: OBIS Canada
Data Presentation Form: Digital
Start Date: 1988-06-01Stop Date: 2010-09-15
Access Constraints none
Use Constraints NOTE - This is not the only data used in completing the stock assessment
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Data Set Progress
Distribution Media: HTTP
Distribution Format: OBIS Schema
Role: DIF AUTHOR
Email: mary.kennedy at dfo-mpo.gc.ca
Bedford Institute of Oceanography, P.O. Box 1006
Province or State: Nova Scotia
Postal Code: B2Y 4A2
Role: TECHNICAL CONTACT
Email: elmer.wade at dfo-mpo.gc.ca
Gulf Fisheries Centre
Province or State: New Brunswick
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Publications in Climatology, 40(1), 84pp. Legates, D.R. and
C.J. Willmott (1990). Mean Seasonal and Spatial Variability in
Gauge-Corrected, Global Precipitation. International Journal of
Legates, D.R. and J.R. Mather (1992). An Evaluation of the Average
Annual Global ... Water Balance. Geographical Review, 82:253-267. Legates,
D.R. and C.J. Willmott (1992). A Comparison of GCM-Simulated and
Observed Mean January and July Precipitation. Palaeogeography,
Paleoclimatology, Paleoecology (Global and Planetary
Legates, D.R. (1994). Global and Terrestrial Precipitation: A
Comparative Assessment of Existing Climatologies. Manuscript submitted
to the International Journal of Climatology.
Creation and Review Dates
Last DIF Revision Date: 2009-04-20