FIRMS - Marine Resource fact sheets - Blue Ling - Other areas of Northeast Atlantic, 2008

Blue Ling - Other areas of Northeast Atlantic, 2008

Marine Resource Fact Sheet

ICES Advice 2009

Blue Ling - Other areas of Northeast Atlantic, 2008

Blue ling in Subdivisions I, II, IIIa, Iva, VIII, IX and XII

Owned by

International Council for the Exploration of the Sea (ICES) – More

Related observations

Locate in inventory

Species:

Molva dypterygia

FAO Names: en - Blue ling, fr - Lingue bleue, es - Maruca azul, ru - Мольва голубая (=биркеланга)

Geographic extent of Blue Ling - Other areas of Northeast Atlantic

Map legend

Area Details

Main Descriptors
Considered a single stock: Yes Spatial Scale: Sub-Regional

Table of Contents

Habitat and Biology - Water Area Overview - Assessment - Management - Biological State and Trend - Source of information

Habitat and Biology

Depth zone: Slope (200 m - 1000 m). Vertical distribution: Demersal/Benthic.

Water Area Overview

Spatial Scale: Sub-Regional

Geo References

Resource Structure

Considered a single stock: Yes

Assessment

Assessment Model

Methodology

Scientific basis

Very few fisheries data are available for blue ling in these areas. The advice is based solely on trends in landings.

Uncertainties in assessment and forecast

Landings reported from Subareas VIII and IX as blue ling (Molva dypterygia) are considered to consist mainly of a related species Molva macropthalma.

Comparison with previous assessment and advice

There has been no change in the perception of blue ling in these areas.

Overall Assessment Results

Table 9.4.11.3.1. Blue ling (Molva dypterygia). Working Group estimates of landings (tonnes). Blue ling: Subarea I.

Year	Iceland	Norway	Germany	Total
1988
1989
1990
1991
1992
1993
1994		3		3
1995		5		5
1996				0
1997		1		1
1998		1		1
1999				0
2000		1		1
2000		3		3
2001		1		1
2002		1		1
2003				0
2004		1		1
2005		1		1
2006				0
2007*				0
*Preliminary.

Table 9.4.11.3.1. Cont’d. Blue ling: Divisions IIa and b.

Year	Faroes	France	Germany	Greenland	Norway	E & W	Scotland	Sweden	Russia	Total
1988	77	37	5		3416	2				3537
1989	126	42	5		1883	2				2058
1990	228	48	4		1128	4				1412
1991	47	23	1		1408					1479
1992	28	19		3	987	2				1039
1993		12	2	3	1003					1020
1994		9	2		399	9				419
1995	0	12	2	2	342	1				359
1996	0	8	1		254	2	2			267
1997	0	10	1		280					291
1998	0	3			272		3			278
1999	0	1	1		287		2			291
2000		2	4		240	1	2			249
2001	8	7			190	1	2			208
2002	1	1			129	1	17			149
2003	30				115		1	1		147
2004	28	1			144				1	174
2005	47	3			144	1			2	197
2006	49	4			149					202
2007*	102	3			154		4			263
*Preliminary.

Table 9.4.11.3.1. Cont’d. Blue ling: Subarea III.

Year	Denmark	Norway	Sweden	Total
1988	10	11	1	22
1989	7	15	1	23
1990	8	12	1	21
1991	9	9	3	21
1992	29	8	1	38
1993	16	6	1	23
1994	14	4		18
1995	16	4		20
1996	9	3		12
1997	14	5	2	21
1998	4	2		6
1999	5	1		6
2000	13	1		14
2001	20	4		24
2002	8	1		9
2003	18	1		19
2004	18	1		19
2005	48	1		49
2006	42			42
2007*				0

Table 9.4.11.3.1. Cont’d. Blue ling: Division IVa.

Year	Denmark	Faroes	France (IV)	Germany	Norway	E & W	Scotland	Ireland	Total
1988	1	13	223	6	116	2	2		363
1989	1		244	4	196	12			457
1990			321	8	162	4			495
1991	1	31	369	7	178	2	32		620
1992	1		236	9	263	8	36		553
1993	2	101	76	2	186	1	44		412
1994			144	3	241	14	19		421
1995		2	73		201	8	193		477
1996		0	52	4	67	4	52		179
1997		0	36		61	0	172		269
1998		1	31		55	2	191		280
1999	2		21		94	25	120	2	264
2000	2		15	1	53	10	46	2	129
2001	7		9		75	7	145	9	252
2002	6		11		58	4	292	5	376
2003	8		8		49	2	25		92
2004	7		17		45		14		83
2005	6		7		51		2		66
2006	6		6		82				94
2007*	5		2		55				62

Table 9.4.11.3.1. Cont’d. Blue ling: Subarea XII.

Year	Faroes	France	Germany	Spain	E & W	Scotland	Norway	Iceland	Poland	Lithuania	Russia	Total
1988		263										263
1989		70										70
1990		5										5
1991		1147										1147
1992		971										971
1993	654	2591	90									3335
1994	382	345	25									752
1995	514	47			12							573
1996	445	60		264		19						788
1997	1	1		411	4							417
1998	36	26		375	1							438
1999	156	17		943	8	43		186				1353
2000	89	23		406	18	23	21	14				594
2001	6	26		415	32	91	103	2				675
2002	19			1234	8		9					1270
2003		7		971		2	40		12	37		1069
2004		27		610							7	644
2005		10		636						8		654
2006		61									4	65
2007*	1											1

9.4.11.3.1. Cont’d. Blue ling: Total landings by Subarea/Division (landings from Areas VIII, IX, and X given in previous reports are now considered to represent Molva macropthalma).

Year	I	II	III	IV	XII	Total
1988		3537	22	363	263	4185
1989		2058	23	459	70	2610
1990		1412	21	501	5	1939
1991		1479	21	627	1147	3274
1992		1039	38	554	971	2602
1993		1020	23	415	3335	4793
1994	3	419	18	424	752	1616
1995	5	359	20	483	573	1440
1996	0	267	12	190	788	1257
1997	1	291	21	270	417	1000
1998	1	278	6	286	438	1009
1999	0	291	6	265	1353	1915
2000	1	249	14	130	594	988
2001	3	208	24	252	675	1162
2002	1	149	9	377	1270	1806
2003	1	147	19	101	1069	1337
2004	0	174	19	83	644	920
2005	1	171	49	70	0	291
2006	0	202	42	94	65	403
2007*	0	263	0	62	1	326
*Preliminary.

Figure 9.4.11.3.1. Blue ling (Molva dypterygia). Working Group estimates of landings (tonnes).

Scientific Advice

Single-stock exploitation boundaries

There should be no directed fisheries for blue ling and management measures should be implemented to minimize the bycatch of this species in mixed fisheries. Blue ling is susceptible to sequential depletion of spawning aggregations and closed areas to protect spawning aggregations should therefore be maintained and expanded where appropriate.

Management

Management Advice

Management considerations

Blue ling has been an important bycatch in the trawl fisheries for mixed deep-water species on Hatton Bank (Subarea XII).

Biological State and Trend

Exploitation rate: Undefined
Abundance level: Undefined

Trends in landings suggest serious depletion, at least in Subareas IIa and IIb (Figure 9.4.11.3.1).

Source of information

ICES.2009.Report of the ICES Advisory Committee, 2009. ICES Advice, 2009.

Fishery Resources Monitoring System