Preliminary results from the winter 2000 demersal fish survey in the Barents Sea

Transkript

1 Working Document to the extra-ordinary AFWG meeting 9-12 May 2000 Bergen, Norway Preliminary results from the winter 2000 demersal fish survey in the Barents Sea ) ~y Asgeir Aglen nstitute of Marine Research P.O. Box 1870 Nordnes N-5024 Bergen NORWAY

2 1. NTRODUCTON MR, Bergen has performed acoustic measurements of demersal fish in the Barent Sea since Since 1981 a bottom trawl survey has been combined with this acoustic survey. The survey area was somewhat increased in Since then the typical effort of the combined survey has been vessel-weeks, and about 350 bottom trawl hauls have been made each year. Most years 3 vessels have participated from about 1 February to 1 March. The purpose of the investigations is: Obtain acoustic abundance indicies of cod, haddock and redfish Obtain swept area idicies of abundance by length (and age) groups of cod haddock, Greenland halibut and redfish. Map the geographical distribution of those fish stocks Estimate length, weight and maturity at age for those stocks Collect stomach samples from cod as a basis for estimating predation by cod The results and the collected data are used both in the CES stock assessments and by several research projects at MR. n the early 90-ies the cod distribution area increased both due to improved climate and increasing stock size. n 1993 the survey area therefore was increased, and since then the survey has been aimed towards covering the whole cod distribution area outside the iceboarders. n 1997 and 1998 the Norwegian research vessels were not allowed to cover the Russian zone, and in 1999 the coverage was partly limited by a rather unusually wide iceextension. The coverage in 2000 was therefore far better than in the three previous years.

3 This report presents the results from the survey in February This year the Russian research vessel "Persey ill" participated in addition to the Norwegian research vessels "G.O. Sars" and "Johan Hjort" and the hired factory trawler "Varegg". The total duration of the survey was from 27 January to 29 February. The total scientific crew on the Norwegian vessels was 28 (see Annex 1). One scientist from PNRO, Murmansk participated onboard "Johan Hjort", and a Russian observer participated on both "G.O. Sars" and "Johan Hjort". Both vessels visited Murmansk for inspection at 3 February. SUMMARY The preliminary swept area results for 2000 indicate: -the 1998 year class of cod is weak and the 1999 year class is very weak - the abundance indices of 3-6 year old cod ( year classes) are about as expected from last assessment the numbers of 7 year and older cod are very low - the 1998 year class of haddock is fairly strong, while 96 and 99 is about average - length and weight at age and weight increment are about as last year both for cod and haddock - survey mortalities has decreased for most age groups of cod and haddock - the abundance indices of the redfish species are among the lowest in the time series and there are no signs of improved recruitment Acoustic estimates. Both for cod, haddock and the redfish species the acoustic estimates indicate a more optimistic stock situation than the swept area estimates indicate.

4 Tabell3.1. Areal (n.mil 2 ) dekka i botntralunders0kingane i Barentshavet vinteren Area (n.milei) covered in the bottom trawl surveys in the Barents Sea winter Omrade (Area) A B c D D' E Svalbard ABCD Total l) Norsk sone og del av Svalbardomradet Norwegian EEZ and part of the Svalbard area Ar (Year) i Tabell 3.2. Tal for tralstasjonar, lengdemalt (L) og aldersbestemt (A) fisk for kvart hovudomrade og stasjonstype i Barentshavet vinteren B 1=fast botntr:'il, B2=amian botntr:'il, P=pelagisk tral. Number of trawl stations, fish measured for length (L) and age (A) for main areas and trawl types in the Barents Sea winter B1 =fixed bottom trawl, B2=other bottom trawl, P=pelagic trawl. Omrade Tral type Tal hal Torsk Hyse Vanleg uer Snabeluer Blakveite (Area) (Trawl (No. (Cod) (Haddock) (S.marinus) (S. mentella) (Greenland hauls) halibut). type) L A L A L A L A L A B A B p B B B p c B B p B D B p B D' B p B E B p s B B p B Total B p Sum

5 Tabel15.1. Ekkomengde av torsk, hyse og uer i det pelagiske sjiktet (P) og i 10 m sjiktet over botn (B) i kvart hovudomrade av Barentshavet vinteren 2000 (m 2 reflekterande overflate 10"\ Echo abundance of cod, haddock and redfish in the pelagic layer (P) and in the 10 m layer above the bottom (B) in main areas of the Barents Sea winter 2000 (m 2 reflecting surface 1 o- 3 ). Omrade (Area) A B c D D' E s Total p Torsk (Cod H se j_h addock) Uer (Reqfish) B Total p B Total p B Total Tabel15.2. Torsk og hyse. Total ekkomengde og ekkomengde i 10 m sjiktet over botn fi a akustisk 1 underss?)kingar i Barentshavet vinteren (m 2 reflekterande overflate 10 \ inkluderer i hovudsak omrada A, B, Cog D. Cod and haddock. Total echo abundance and echo abundance in the 10 m layer above the bottom from acoustic surveys in the Barents Sea winter (m 2 reflecting surface 1 o- 3 ) includes mainly areas A, B, C and D. Ar (Year) Ekkomengde (Echo abundance) Total Botn (bottom) Botn/total (bottom/total) Torsk Hyse Sum Torsk Hyse Sum Torsk Hyse Sum (Cod) (Had.) (Cod) (Had.) (Cod) (Had.) ) Norsk sone og del av Svalbardomradet Norwegian EEZ and part of the Svalbard area 4

6 Tabell6.1. TORSK. Mengdeindeksar for lengde- og aldersgrupper fra den akustiske unders0kinga i Barentshavet vinteren 2000 (talet pa fisk i millionar). COD. Abundance indices at length and age from the acoustic survey in the Barents Sea winter 2000 (numbers in millions). Lengde (Length) cm >90 Sum Alder (arsklasse) Age (year-class) (99) (98) (97) (96) (95) (94) (93) (92) (91) 10+ Sum ' Tabell6.2. TORSK. Akustiske mengdeindeksar i det pelagiske sjiktet (P) og i 10 m sjiktet over botn (B) for kvart hovudomrade av Barentshavet vinteren 2000 (talet pa fisk i millionar). COD. Acoustic abundance indices in the pelagic layer (P) and in the 10 m layer above the bottom (B) for the main areas of the Barents Sea winter 2000 (numbers in millions). Omr. (Area) A B c D D' E s ABCD Total Sjikt Alder (arsklasse) Age (year-class (Layer) Total (99) (98) (97) (96) (95) (94) (93) (92) (91) p B p B p B p B p B p B p B p B p B Sum

7 Tabell6.3. TORSK. Mengdeindeksar fn\ akustiske unders0kingar i Barentshavet vinteren (talet pa fisk i millionar) inkluderer i hovudsak omrada A, B, Cog D. COD. Abundance indices from acoustic surveys in the Barents Sea winter (numbers in millions) includes mainly areas A, B C and D. Ar Alder (Age) (Year) Total ) ndeksar oppjusterte til ogsa a omfatta russisk sone. ndices raised to also represent the Russian EEZ 8

8 Tabell 6.4. TORSK. Mengdeindeksar () for lengdegrupper med standard feil (S) fra. botntraj.hal for kvart hovudomrade av Barentshavet vinteren 2000 (talet fisk i millionar) COD. Abundance indices () at length with standard error of mean (S) from bottom trawl hauls for main areas of the Barents Sea winter 2000 (no. in millions). Lengde Omrade (Are;) (Length) A B c D D' E s Total cm s s s s s s s s CV(%) > " Sum

9 Tabell 6.5. TORSK. Mengdeindeksar for lengde- og aldersgrupper fra botntril.lunders!llkinga i Barentshavet vinteren 2000 (talet pa fisk i millionar). COD. Abundance indices at length and age.from the bottom trawl survey in the Barents Sea winter 2000 (numbers in millions). Lengde (Length) (cm) >90 Sum Alder (il.rsklasse) A,;e (year-class) Sum (99) (98) (97) (96) (95) (94) (93) (92) (91) ; _.7_- ~ Tabell 6.6. TORSK. Mengdeindeksar fra botntralhal for kvart hovudomril.de av Barentshavet vinteren 2000 (talet pa fisk i millionar). COD. Abundance indices from bottom trawl hauls for main areas of the Barents Sea winter 2000 (numbers in millions.) Omr. (Area) A B c D D' E s ABCD Total Alder (il.rsklasse) A,;e (year-class) Total (99) (98) (97) (96) (95) (94) (93) (92) (91) <1/t lt>:u. l,tr.; t!.o 5'S:t/ /B.i 3.1! /.t,

10 Tabell6.7. TORSK. Mengdeindeksar fra botntr!uundersjijkingar i Barentshavet vinteren (talet pa fisk i millionar) inkluderer berre hovudonrrada A, B, Cog D. COD. Abundance indices from bottom trawl surveys in the Barents Sea winter (numbers in millions) includes only main areas A, B, C and D). Ar Alder (Age) (Year) Total i J ~1,~1- tl /.~() ll,;,),j.~cj- 50,$)~ 1 ) ndeksar oppjusterte til ogsa a omfatta russisk sone. ndices raised to also represent the Russian EEZ Tabell6.8. TORSK. Lengde (cm) ved alder i kvart hovudomrade av Barentshavet vinteren Omade COD. Length (cm) at age in main areas of the Barents Sea winter Alder (arsklasse Ag-e (year-class) (Area) (99) (98) (97) (96) (95) (94) (93) (92) A B c D D' E s Total

11 Tabell6.9. TORSK. Lengde (cm) ved alder i Barentshavet fra unders!':hcingane vinteren COD. Length (cm) at age in the Barents Sea from the investigations winter Ar (Year) i Alder (A~e)_ Justerte lengder Adjusted lengths 12

12 Tabell6.10. TORSK. Vekt (g) ved alder i kvart hovudomrade av Barentshavet vinteren COD. Weight (g) at age in main areas of the Barents Sea winter Omrade Alder (arsklasse) Age (year-clas~) (Area) (99) (98) (97) (96) (95) (94) (93) A B c D D' E s Total (92) Tabell TORSK. Vekt (g) ved alder i Barentshavet fra unders!?)kingane vintcren COD. Weight (g) at age in the Barents Sea from the investigations winter Ar (Ye m) Alder (Age) ) Estimerte vekter (Estimated weights) 2 ) Justerte vekter (Adjusted weights) 13

13 Tabell6.12. TORSK. Arleg tilvekst (g) fra unders0kingane i Barentshavet vinteren COD. Yearly weightincrement (g) from the investigations in the Barents Sea winter Ar Alder (Age) (Year) ,16 Tabell6.13. Total d0dsrate for torsk observert under vintertoktet i Barentshavet i perioden Total mortality observed for cod during the winter survey in the Barents Sea in Ar Alder (Age) (Year) Akustiske unders0kingar (Acoustic investigations) , Botntral-unders0kingar (Bottomtrawl investigations) c 14

14 Tabell 7.1. HYSE. Mengdeindeksar for lengde- og aldersgrupper fra den akustiske unders0kinga i Barentshavet vinteren 2000 (talet pa fisk i millionar). HADDOCK Abundance indices at length and age from the acoustic survey in the Barents Sea winter 2000 (numbers in millions). Lengde (Length) (cm) ' >90 Sum Alder (arsklasse) A.r;e (year-class) (99) (98) (97) (96) (95) (94) (93) (92) (91) Sum Tabell7.2. HYSE. Akustiske mengdeindeksar i det pelagiske sjiktet (P) og i 10 m sjiktet over botn (B) for kvart hovudomrade av Barentshavet vinteren 2000 (talet pa fisk i millionar). HADDOCK Acoustic abundance indices in the pelagic layer (P} and in the 10 m layer above the bottom (B) for the main areas of the Barents Sea winter 2000 (numbers in millions). Omr. (Area) A B c D D' E s ABCD Total Sjikt Alder (arsklasse) A.r;e (year-class (Layer) Total (99) (98) (97) (96) (95) (94) (93) (92) (91) p B p B p B p B p B p B p B p B p B Sum

15 Tabell7.3. HYSE. Mengdeindeksar fra akustiske unders0kingar i Barentshavet vinteren (talet pa fisk i millionar) inkluderer i hovudsak omrada A, B, Cog D. HADDOCK Abundance indices from acoustic surveys in the Barents Sea winter (numbers in millions) includes mainly areas A, B, C and D. Ar Alder (Age) (Year) Total ' i ) ndeksar oppjusterte til ogsa a omfatta russisk sane. ndices raised to also represent the Russian EEZ 16

16 Tabell 7.4. HYSE. Mengdeindeksar () for lengdegrupper med standard feil (S) fra botntril.lhal for kvart hovudomril.de av Barentshavet vinteren 2000 (talet fisk i millionar). HADDOCK. Abundance indices () at length with standard error of mean (S) from bottom trawl haulsfor main areas of the Barents Sea winter 2000 (no. in mill). Lengde Omrade (Area) (Length) A B c D D' E s Total cm s s s s s s s s CV(%) > Oj Sum

17 Tabell 7.5. HYSE. Mengdeindeksar for lengde- og aldersgrupper fra botntralunders!'lkinga i Barentshavet vinteren 2000 (talet pa fisk i millionar). HADDOCK. Abundance indices at length and age from the bottom trawl survey in the Barents Sea winter 2000 (numbers in millions). Lengde (Length) (cm) Sum Alder (arsklasse) Age (year-class) Sum (99) (98) (97) (96) (95) (94) (93) (92) (91) ' Tabell 7.6. HYSE. Mengdeindeksar fra botntralhal for kvart hovudomrade av Barentshavet vinteren 2000 (talet pa fisk i millionar). HADDOCK. Abundance indices from bottom trawl hauls for main areas of the Barents Sea winter 2000 (numbers in millions). Omr. (Area) A B c D D' E s ABCD Total Alder (arsklasse) Age (year-class) Total (99) (98) (97) (96) (95) (94) (93) (92) (91)

18 Tabell7.7 HYSE. Mengdeindeksar :fra botntn1lunders!llkingar i Barentshavet vinteren (talet pa fisk i millionar) inkluderer berre hovudomrada A, B, Cog D. HADDOCK Abundance indices from bottom trawl surveys in the Barents Sea winter (numbers in millions) includes only main areas A, B, C and D. Ar Alder (Age) (Year) Total ! > ndeksar oppjusterte til ogsa a omfatta russisk sone. ndices raised to also represent the Russian EEZ Tabell 7.8. HYSE. Lengde (cm) ved alder i kvart hovudomrade av Barentshavet vinteren HADDOCK Length (cm) at age in main areas of the Barents Sea winter Omrade Alder (arsklasse) Age _fy_ear-class) (Area) (99) (98) (97) (96) (95) (94) (93) (92) A B c D D' E s Total

19 Tabell7.9. HYSE. Lengde (cm) ved alder i Barentshavet fra unders~<lfkingane vinteren HADDOCK Length (cm) at age in the Barents Sea from the investigations winter Ar (Year) i Alder (Age J) Justerte lengder Adjusted lengths Tabell HYSE. Vekt (g) ved alder i kvart hovudornrade av Barentshavet vinteren HADDOCK Weight (g) at age in main areas of the Barents Sea winter Ornrade Alder (iirsklasse) Age (year-class) (Area) (99) (98) (97) (96) (95) (94) (93) A B c D D' E s Total (92)

20 Tabell HYSE. Vekt (g) ved alder i Barentshavet frii unders0kingane vinteren HADDOCK Weight (g) at age in the Barents Sea from the investigations winter Ar (Year) Alder (A~e loo ) Estimerte vekter (Estimated weights) 2 ) Justerte vekter (Acijusted weights) Tabell HYSE. Arleg tilvekst (g) frii unders0kingane i Barentshavet vinteren HADDOCK. Yearly weightincrement (g) from the investigations in the Barents Sea winter Ar (Year) Alder (Age)

21 Tabel Total d!lldsrate for hyse observert under vintertoktet i Barentshavet for perioden Total mortality observed for haddock during the winter survey in the Barents Sea for the period Ar (Year) Alder (Age) Akustiske unders!llkingar (Acoustic investigations) Botntdl-unders!llkingar (Bottom trawl investigations) L

22 Tabell 8.1. V ANLEG UER. Akustiske mengdeindeksar for kvart hovudomnide av Barentshavet vinteren 2000 (talet pa fisk i millionar). SEBASTES MARNUS. Acoustic abundance indices for main areas of the Barents Sea winter 2000 (numbers in millions). Omrade (Area) A B c D D' E s ABCD Total Lengde~ uppe (cm) Lenl{th!{roup (cm) >45 Total Tabell 8.2. V ANLEG UER. Mengdeindeksar fra akustiske unders!i)kingar i Barentshavet vinteren (talet pa fisk i millionar) inkluderer berre omradet som vart dekka i SEBASTES MARNUS. Abundance indices fi om acoustic surveys in the Barents Sea winter (numbers in millions) includes only the area covered in Ar Lengde~ uppe (cm) Length group (cm) (Year) >45 Total ) ndeksar oppjusterte til ogsa a omfatta russisk sone. ndices raised to also represent the Russian EEZ 23

23 Tabell 8.3. SNABELUER. 1 Akustiske mengdeindeksar for kvart hovudomrade av Barentshavet vinteren 2000 (talet pa fisk i millionar). SEBASTES MENTELLA. 1 Acoustic abundance indices for main areas of the Barents Sea winter 2000 (numbers in millions): Omrade Lengdegruppe (cm) Length group (cm) (Area) >45 Total A B c D D' E s ABCD Total ) nkluderer uidentifiserte Sebastes individer, for det meste mindre enn 15 cm. ncludes unidentified Sebastes specimens, mostly less than 15 cm. Tabell 8.4. SNABELUER. 1 Mengdeindeksar fra akustiske unders0kingar i Barentshavet vinteren (talet pa fisk i millionar) inkluderer berre omradet som vart dekka i SEBASTES MENTELLA. 1 Abundance indices from acoustic surveys in the Barents Sea winter (numbers in millions).) includes only the area covered in Ar Lengd~ llppe (cm) Length gr_oup (cmj (Year) >45 Total ) nkluderer uidentifiserte Sebastes individer, for det meste mindre enn 15 cm. ncludes unidentified Sebastes specimens, mostly less than 15 cm. 2 l ndeksar oppjusterte til ogsa a omfatta russisk sone. ndices raised to also represent the the Russian EEZ. 24

24 Tabell 8.5. LUSUER. Akustiske mengdeindeksar for kvart hovudomnl.de av Barentshavet vinteren 2000 (talet pa fisk i millionar). SEBASTES VVPARUS. Acoustic abundance indices for main areas of the Barents Sea winter 2000 (numbers in millions). Omrade (Area) A B c D D' E s ABCD Total Lengdegruppe (cm) Length ~ourzis:ml >30 Total Tabell 8.6. LUSUER. Mengdeindeksar fra akustiske unders~kingar i Barentshavet vinteren (talet pa fisk i millionar) inkluderer berre omradet som vart dekka i SEBASTES VVPARUS. Abundance indices from acoustic surveys in the Barents Sea winter (numbers in millions) includes only the area covered in Ar (Year) Lengdegruppe (cm) Length g!'ourzlc:ml > 30 Total

25 Tabell8.7. V ANLEG UER. Mengdeindeksar () for lengdegrupper med standard feil (S) fra. botntrhlhal for kvart hovudomrade av Barentshavet vinteren 2000 (talet pa fisk i millionar). SEBASTES MARJNUS. Abundance indices () at length with standard error of mean (S) from bottom trawl hauls for main areas of the Barents Sea winter Lengde Omrade (Area) (Length) A B c D D' E s Total cm s s s s s s s s CV(%) > Sum L_~3.~ Tabell8.8. SNABELUER. 1 Mengdeindeksar () for lengdegrupper med standard feil (S) fra botntriilhal for kvart hovudomrade av Barentshavet vinteren 2000 (talet pa fisk i millionar). SEBASTES MENTELLA. 1 Abundance indices () at length with standard error of mean (S) from bottom trawl hauls for main areas of the Barents Sea winter 2000 Lengde Omrade (Area) (Length) A B c D D' E s Total cm s s s s s s s s CV(%) > Sum ) nkluderer uidentifiserte Sebastes individer, for det meste rnindre enn 15 cm. ncludes unidentified Sebastes specimens, mostly less than 15 cm. 26

26 Tabell8.9. V ANLEG UER. Mengdeindeksar fra botntri'tlunders0kingar i Barentshavet vinteren (talet pa fisk i millionar) inkluderer berre hovudomrada A, B, Cog D. SEBASTES MARNUS. Abundance indices from bottom trawl surveys in the Barents Sea winter (numbers in millions) includes only main areas A, B, C and D. k (Year) Len,~: degruppe (cm) Len,;th,;roup (cm) >45 Total l) ndeksar oppjusterte til ogsa a omfatta russisk sone. indices raised to also represent the Russian EEZ. Tabell SNABELUER. 1 Mengdeindeksar fra botntralunders0kingar i Barentshavet vinteren (talet pa fisk i millionar) inkluderer berre hovudomrade A, B, Cog D. SEBASTES MENTELLA. 1 Abundance indices from bottom trawl surveys in the Barents Sea winter (numbers in millions) includes only main areas A, B, C and D. k Len~ degruppe (cm) Len,;th group (cm) (Year) >45 Total ) nkluderer uidentifiserte Sebastes individer, for det meste mindre enn 15 cm. ncludes unidentified Sebastes specimens, mostly less than 15 cm. 2 ) ndeksar oppjusterte til ogsa a omfatta russisk so ne. ndices raised to also represent the Russian EEZ. 27

27 Perseylll Fig Kurslinjer og triilstasjonar; F/F "G.O. Sars" , F/F "Johan Hjort" , F/F "Varegg" og F/F "Persey ll" Survey tracks and trawl stations; RV "G.O. Sars" , RV "JohanHjort" , FF "Varegg" and FF "Persey 111" E L Figur 3.2. Unders!1)kingsomradet med hovudomrade A, B, C og D, tilleggsomrade D 1, E og S og tralstasjonar teke i botntriilunders!1)kinga The survey area with main areas A, B, C and D, additional areas D', E and Sand stations taken in the bottom trawl survey

28 74' 73'../\ 72' J 71' 70' c -Drifllcebordor 74' 73' 72' 71' 26' 30' 34' 38' 42' 46' 50' 54' Figur 4.2. Temperaturfordeling februar A) ved overflata, B) i loo m djup, C) ved botnen. Temperature distribution February A) surface, B) 100 m depth, C) bottom. 4

29 ~ 1-99 liz >100 - Drift iceborder -- Area covered Figur 6.7. TORSK < 20 cm. Fordeling i tralfangstane vinteren 2000(talet pa fisk pr. traltime). COD < 20 cm. Distribution in the trawl catches winter 2000(number per hour trawling). 54 ~ 1-99 ~ lll8ll > Drift lceborder -- Area covered Figur 6.8. TORSK cm. Fordeling i tralfangstane vinteren 2000(talet pa fisk pr. traltime). COD cm. Distribution in the trawl catches winter 2000(number per hour trawling). 5

30 ~ 1 99 ~ ~ > Drift lceborder -- Area covered ~~~-L~~~L_~~~~~~~~~~_L~~~~~~~~~~~~_L_L~~ Figur 6.9. TORSK cm. Fordeling i trihfangstane vinteren 2000(talet pa fisk pr. traltime). COD cm. Distribution in the trawl catches winter 2000(number per hour trawling). fzj1 99 ~ >100 - Drift lceborder -- Area covered Figur TORSK >50 cm. Fordeling i tralfangstane vinteren 2000(talet pa fisk pr. traltime). COD> 50 cm. Distribution in the trawl catches winter 2000(number per hour trawling). 6

31 75 [ ~ ~ > Drift lceborder -- Area covered Figur 7.7. HYSE < 20 cm. Fordeling i tralfangstane vinteren 2000 (talet pa fisk pr. traltime). HADDOCK< 20 cm. Distribution in the trawl catches winter 2000 (number per hour trawling). [ ~ ~ > Drift lceborder -- Area covered Figur 7.8. HYSE cm. Fordeling i tralfangstane vinteren 2000 (talet pa fisk pr. tri'tltime). HADDOCK cm. Distribution in the trawl catches winter 2000 (number per hour trawling). 7

32 r----j , i 1 r----., ~ 1 99 ~ >100 - Drift lceborder -- Area covered r r L , L------~ r-~ Figur 7.9. HYSE cm. Fordeling i tralfangstane vinteren 2000 (talet pa fisk pr. traltime). HADDOCK cm. Distribution in the trawl catches winter 2000 (number per hour trawling) ' r----j L , ' 1 r----., ~ Drtft lcabordar -- Area covered o r j L , L J r-..j ' ' ' Figur HYSE > 50 cm. Fordeling i tralfangstane vinteren 2000 (talet pa fisk pr. traltime ). HADDOCK> 50 cm. Distribution in the trawl catches winter 2000 (number per hour trawling). 8

33 76 7S o r----j L , ~ 1 99 ~ >100! l 1 r----, - Drift lceborder -- Area covered ' r------j l, L j ~ r-j l l l eg as 14 1S S so Figur 8.2. V ANLEG UER. Fordeling i trihfangstane vinteren 2000 (tal et pafisk pr. trihtime ). SEBASTES MARNUS. Distribution in the trawl catches winter 2000 (no. per hour trawling). ~ ~ ll!! >1000 7S 0 - Drift lceborder -- Area covered o eg as 14 1s S so S4 Figur 8.3. SNABELUER. Fordeling i tralfangstane vinteren 2000 (talet pa fisk pr. trihtime ). SEBASTES JvlENTELLA. Distribution in the trawl catches winter 2000 (no. per hour trawling). 9

34 L , 1 r----, f2d 1-99 ~ >100 - Drift Jceborder -- Area covered i ~ J l L r-...j Figur 9.1. BLAKVETE. Fordeling i tralfangstane vinteren 2000 (talet pa fisk pr. traltime). GREENLAND HALBUT. Distribution in the trawl catches winter 2000 (no. per hour trawling). 10