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Basking shark - Northeast Atlantic, 2008
Marine Resource  Fact Sheet
ICES Advice 2009
Basking shark - Northeast Atlantic, 2008
Fact Sheet Citation  
Basking shark (Cetorhinus maximus) in the northeast Atlantic (ICES Areas I XIV)
Owned byInternational Council for the Exploration of the Sea (ICES) – More
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Species:
FAO Names: en - Basking shark, fr - Pèlerin, es - Peregrino, ru - Акула гигантская
Geographic extent of Basking shark - Northeast Atlantic
Main Descriptors
Considered a single stock: No        Spatial Scale: Sub-Regional
Management unit: No
 
 
Habitat and Biology
Depth zone: Shelf (50 m - 200 m).   Vertical distribution: Pelagic.  

Geographical Distribution
Jurisdictional distribution: Straddling between High Seas and EEZ

Water Area Overview
Spatial Scale: Sub-Regional

Geo References
Resource Structure
Considered a single stock: No
Assessment
 
Overall Assessment Results


Figure 9.4.8.1 Basking sharks in the northeast Atlantic. Total landings (tonnes) of basking sharks, 1977 to 2007. Revised in 2008 based on new conversion factors for Norwegian landings.


Table 9.4.8.1 Basking sharks in the northeast Atlantic. Working Group estimates of total landings (t) of basking shark in ICES Areas I–XIV from 1977 to 2007. Based on ICES STATLANT with Norwegian landings data updated using revised conversion factors. Source: ICES (2008).
Year I & II III & IV Va Vb VI VII VIII IX X XII XIV TOTAL
1977 3680                     3680
1978 3349     14   278           3641
1979 5120         139 7         5266
1980 3642     83               3725
1981 1772     28               1800
1982 1970         186           2156
1983 967 734       60           1761
1984 873 1188       1           2062
1985 1465                     1465
1986 1144                     1144
1987 164                     164
1988 96 10                   106
1989 593                     593
1990 781 116         1         898
1991 533 220         0         753
1992 1613 84         0         1697
1993 1374           0         1374
1994 920 157         0         1077
1995 604 23         1         628
1996 792           0 1       793
1997 425 43         2 1       471
1998 55           1         56
1999 31           1         32
2000 117           1         118
2001 80           0   1     81
2002 54           0         54
2003 128 0         0 1       129
2004 72           0 +       72
2005 87         1 0 2       90
2006 6         0 0 0       6
2007 26         0 0 0       26


Scientific Advice

Single-stock exploitation boundaries

The only new information available for basking shark (Cetorhinus maximus) is landings data which gives no basis to revise the advice from 2006. The advice for 2009 and 2010 is therefore the same as the advice given in 2006: “No targeted fishing for basking shark should be permitted and additional measures should be taken to prevent bycatch of basking shark in fisheries targeting other species. A TAC should cover all areas where basking sharks are caught in the northeast Atlantic. This TAC should be set at zero.”

ICES notes that from 2007 onwards the TAC covers all areas where basking sharks may be caught.



Year

ICES

Advice

Single-stock exploitation boundaries Predicted catch corresponding to advice Predicted catch corresponding to single-stock exploitation boundaries

Agreed

TAC

ACOM

Landings (‘000 t)

1977 None         3.68
1978 None         3.64
1979 None         5.27
1980 None         3.73
1981 None         1.80
1982 None         2.16
1983 None         1.76
1984 None         2.06
1985 None         1.47
1986 None         1.14
1987 None         0.16
1988 None         0.11
1989 None         0.59
1990 None         0.90
1991 None         0.75
1992 None         1.70
1993 None         1.37
1994 None         1.08
1995 None         0.63
1996 None         0.79
1997 None         0.47
1998 None         0.06
1999 None         0.03
2000 None         0.12
2001 None         0.08
2002 None       0 0.05
2003 None       0 0.13
2004 None       0 0.07
2005 TAC = 0       0 0.09
2006         0 0.01
2007         Prohibited species 0.03
2008 TAC = 0       Prohibited species -

2009

2010

No fishery       Prohibited species  


Management
Management unit: No

Management Advice

Management considerations

The advice for 2009 is biennial and valid for 2009 and 2010 and is cited in the text table below (see Source of information: ICES. 2008. Report of the ICES Advisory Committee, 2008. ICES Advice, 2008. Book 9. 345 pp.)


Porbeagle (Lamna nasus). All areas

Given the state of the stock, no targeted fishing for porbeagle should be permitted and bycatch should be limited and landings of porbeagle should not be allowed.

Porbeagles are particularly vulnerable to fishing mortality, because the population productivity is low (long-lived, slow-growing, high age-at-maturity, low fecundity, and a protracted gestation period) and they have an aggregating behaviour. Therefore, risk of depletion of reproductive potential is high. It is recommended that exploitation of this species should only be allowed when indicators and reference points for stock status and future harvest have been identified and a management strategy, including appropriate monitoring requirements has been decided upon and is implemented.



Biological State and Trend
Exploitation rate: Undefined
Abundance level: Undefined

Do not delete header.
Source of information
 
ICES. 2008. Report of the Working Group on Elasmobranch Fishes (WGEF). ICES CM 2008/ACOM: 16.
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