Volumes

by publication dates
November 2020 (1)
October 2020 (1)
July 2020 (1)
June 2020 (2)
January 2020 (1)
May 2019 (1)
April 2019 (1)
March 2019 (1)
January 2019 (1)
January 2018 (1)
December 2017 (1)
October 2017 (1)
July 2017 (1)
December 2016 (2)
November 2016 (1)
October 2016 (1)
February 2016 (1)
December 2015 (4)
September 2015 (2)
July 2015 (1)
March 2015 (1)
December 2014 (3)
July 2014 (2)
May 2014 (1)
December 2013 (4)
October 2013 (1)
March 2013 (1)
January 2013 (1)
December 2012 (6)
October 2012 (2)
July 2012 (1)
January 2012 (1)
December 2011 (3)
November 2011 (1)
October 2011 (1)
September 2011 (1)
August 2011 (1)
May 2011 (1)
March 2011 (1)
February 2011 (1)
August 2010 (1)
June 2010 (2)
May 2010 (2)
April 2010 (1)
March 2010 (2)
February 2010 (2)
December 2009 (1)
October 2009 (6)
September 2009 (2)
August 2009 (2)
July 2009 (1)
April 2009 (1)
February 2009 (7)
January 2009 (5)
December 2008 (1)
October 2008 (1)
September 2008 (4)
August 2008 (4)
June 2008 (1)
May 2008 (1)
April 2008 (1)
February 2008 (4)
January 2008 (3)
December 2007 (5)
November 2007 (2)
August 2007 (1)
June 2007 (3)
May 2007 (4)
March 2007 (3)
February 2007 (1)
January 2007 (1)
November 2006 (1)
October 2006 (1)
September 2006 (3)
June 2006 (1)
May 2006 (1)
April 2006 (2)
February 2006 (2)
January 2006 (2)
December 2005 (7)
November 2005 (1)
October 2005 (5)
September 2005 (1)
June 2005 (1)
April 2005 (3)
March 2005 (16)
February 2005 (4)
January 2005 (6)
December 2004 (2)
November 2004 (7)
October 2004 (1)
September 2004 (12)
December 2003 (4)
October 2003 (37)
March 2003 (13)
December 2002 (7)
December 2001 (7)
December 2000 (34)
October 1999 (21)
November 1998 (6)
October 1998 (18)
December 1997 (28)
April 1997 (7)
October 1996 (13)
September 1996 (1)
April 1996 (9)
October 1994 (8)
July 1994 (9)
December 1993 (1)
December 1992 (26)
January 1992 (9)
February 1991 (9)
December 1990 (3)
December 1989 (8)
October 1989 (9)
December 1988 (9)
December 1987 (11)
December 1986 (11)
December 1985 (10)
June 1985 (11)
November 1984 (12)
January 1984 (18)
July 1983 (1)
December 1982 (12)
May 1982 (9)
November 1981 (12)
November 1980 (12)


JNAFS

01

C. Hvingel, H. Lassen and D. G. Parsons

Pinngortitaleriffik-Greenland Institute of Natural Resources
P. O. Box 570, DK-3900 Nuuk, Greenland

Source - Journal of Northwest Atlantic Fishery Science, Volume 26: 25-36
ISSN-0250-6408

Abstract

Four biomass indices for the northern shrimp (Pandalus borealis) stock in Davis Strait, derived from commercial catch-per-unit-effort (CPUE) data, were analysed by multiple regression to construct a single time series with the ultimate goal of tracking trends in stock biomass during the period 1976 to 1997. Indices from the offshore fisheries have been used previously in stock assessments while an index derived from logbook data for small inshore vessels operating around Disko Island has not been presented previously.

The analysis used multiplicative models and linked catch rate to vessel fishing power, temporal and spatial availability and overall annual biomass density. In two of the indices, the temporal (MONTH) and spatial (AREA) effects were modelled as interaction terms. Other second order effects were treated as random error. The AREA*MONTH interaction term corresponds to an annual migration or behavioural pattern. The procedure corrects for increases in technological efficiency over the 22-year period due to fleet renewal but changes in the efficiency of individual vessels were not accounted for.

The four indices were combined, weighted by the area of the total fishing grounds each index represented. The combined index was indicative of the biomass density for shrimp greater than about 17 mm in carapace length. During the 1976-88 period, the index was higher than from 1989 onwards. The combined index showed agreement with research survey biomass estimates but the contrast in the data was low during the period of comparison (1988-97). The combined CPUE index was applied to the total catches to derive estimates of total standardized effort. This effort index increased substantially in the late-1980s.

PDF

Language - English Publisher - Northwest Atlantic Fisheries Organization (NAFO), Dartmouth, N.S., Canada
Publication Date - December 2000
Publication Type - Journal Article

Citation: C. Hvingel, H. Lassen and D. G. Parsons. 2000. A Biomass Index for Northern Shrimp (Pandalus borealis) in Davis Strait Based on Multiplicative Modelling of Commercial Catch-per-unit-effort Data (1976-97). J. Northw. Atl. Fish. Sci., 26: 25-36. doi.org/10.2960/J.v26.a2
Posted in: Volume 26 - 2000
Actions: E-mail | Permalink |