BERING SEA POLLOCK RECRUITMENT. ABUNDANCE DISTRIBUTION AND APPROACH TO FISHERY MANAGEMENT UNDER CHANGING ENVIRONMENT TINRO-CENTER, VLADIVOSTOK

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1 BERING SEA POLLOCK RECRUITMENT. ABUNDANCE DISTRIBUTION AND APPROACH TO FISHERY MANAGEMENT UNDER CHANGING ENVIRONMENT Stepanenko M.A. TINRO-CENTER, VLADIVOSTOK

2 о.св.лаврентия о.нунивак 1 м о.унимак Fig. 1. Bottom trawl survey station locations in the northwestern Bering Sea (TINRO-center) and EI MWT survey (AFSC) tracklines in the eastern and northwestern Bering Sea Б Fig. 2.. EI MWT survey (TINRO-center) tracklines in the northwestern Bering Sea (27) 99 6(28) 8 7(29) 1(23) 9 2(24) 3(25) 4(26) W 5 2 1

3 Fig. 3. Pollock eggs (I IV IV stages) distribution in the Bering Sea in , 1992, number/sq. mile. The 2 m depth contour line is indicated as dotted line 1985, April 22 May , April 11 May , April 11 May , April 7 June , April 13 May 27

4 m 1 m W Fig. 4.. Walleye pollock regular distribution (fish/.5 hour tow) in the Bering Sea in summer-autumn period

5 66 VII (8-) IV-V (5-1) III (7-) IV (5-7) V-VI (6-1) 58 V-VII (7-) IV ( 4-6) IV (5-1) III (6-1) (7-) III-IV (9-) II-III (5-7) II-III (6-1) III-IV(5-7) I-II (7-) Fig. 5. Distribution of spawning concentrations and general direction of prespawning migrations of the Bering Sea pollock (1 - eastern and northwestern Bering Sea, 2 - area off Aleutian Islands, 3 - western Bering Sea). Months of most intensive spawning indicated d by Roman numerals and range of predominant ages of spawning pollock by Arabic numerals. Diameter of the circles reflects relative density of spawning concentrations

6 Fig. 6. Locations of winter concentrations of the Bering Sea pollock (1 - eastern and northwestern Bering Sea, 2 - area off Aleutian Islands, 3 - western Bering Sea). The range of dominant pollock ages is indicated by Arabic numerals. Diameter of circles reflects relative density of winter concentrations

7 Fig. 7. Pollock distribution in the Bering Sea, summer-autumn period, 1987 А pollock length 21-4 см, Á Б pollock length 41-6 см, В pollock length > 6 см 6 1 ì À Â ì 1 ì

8 Fig. 8. Pollock distribution in the Bering Sea in spring-autumn period, 1988 А pollock length 25-4 см, Б pollock length 41-6 см, В pollock length > 6 см 6 Á Óñëîâíûå îáîçíà åíèÿ, øò./ àñ.òð.: - ; - 1-1; - 1-5; - 5-1; - 1-1; î.ñâ.ëàâðåíòèÿ 1 ì À Óñëîâíûå îáîçíà åíèÿ, øò./ àñ.òð.: - ; - 1-1; - 1-5; - 5-1; - 1-1; î.ñâ.ëàâðåíòèÿ Â Óñëîâíûå îáîçíà åíèÿ, øò./ àñ.òð.: - ; - 1-1; - 1-5; - 5-1; î.ñâ.ëàâðåíòèÿ ì 1 ì

9 Fig. 9. Distribution of pollock in the Bering Sea midwater in summer-autumn, 1999 A) Pollock length < 2 см; Б) ) 21-4 см; В) ) 41-6 см; Г) > 6 см À Â ì 1 ì Á Ã ì 1 ì

10 Fig. 1. Pollock distribution in the eastern and northwestern Bering Sea in summer period, 24, гг. 3 3 O P Q R S T U V W X Y Z AA AB AC AD AE AF AG AH AI AJ AK AL AM AN AO 3 O P Q R S T U V W X Y Z AA AB AC AD AE AF AG AH AI AJ AK AL AM AN AO O P Q R S T U V W X Y Z AA AB AC AD AE AF AG AH AI AJ AK AL AM AN AO г г г O P Q R S T U V W X Y Z AA AB AC AD AE AF AG AH AI AJ AK AL AM AN AO 3 O P Q R S T U V W X Y Z AA AB AC AD AE AF AG AH AI AJ AK AL AM AN AO г г

11 % Age Russian EEZ US EEZ Fig Comparative pollock abundance by age in the northwestern (Russian EEZ) and eastern (US EEZ) Bering Sea in summer autumn in 199-s % Fig..Comparative pollock biomass by age in the northwestern (Russian EEZ) and eastern (US EEZ) Bering Sea in summer autumn in 199-s Age Russian EEZ US EEZ

12 Fig. 13. Walleye pollock age composition in the eastern and northwestern Bering Sea (a midwater,, b off bottom) in summer-autumn, 21 % N USA = 442, mln. N NavAr = 957,9 mln. a) % N USA = 4946,8 mln. N NavAr = 3358,4 mln. b) Age+ US A NavAr Age+ US A NavAr

13 3 2 1 Fig. 14. The Bering Sea pollock year-classes strength relative to population biomass (a), female spawning biomass (b), Bogoslof spawning biomass (c), young-of of-the the-year fish abundance(d). 69,1 r =,38, Year Age 1 pollock abundance (1^9) Total pollock biomass, t (1^6) ,1 r = -,22,4 Age 1 pollock abundance Total pollock biomass 69,1 r = -,76, Year Age 1 pollock abundance (1^9) Female spawning biomass, t (1^6) Age 1 pollock abundance (1^9) Year 15 Bogoslof spawning biomass, t (1^6) 1 5 Age 1 pollock abundance Bogoslof spawning biomass ,1 r = -,56,4 39 Young-of-the-year fish abundance (1^9) Age 1 pollock abundance (1^9) Year Age 1 pollock abundance Female spawning biomass Age 1 pollock abundance Young-of-the-year fish abundance

14 Fig. 15. Area-weighted bottom (lower lines) and surface (upper lines) temperatures for the Bering Sea during the NMFS summer botom-trawl surveys ( ). Fig. 16. Inter-annual variability of temperature and salinity anomalies in layer 5 m (bottom depth 1-2 m) in the nortwestern Bering Sea (Navarin area) in summer-autumn. Black point expected value of anomaly in 2

15 2 15 Ths. tonns Year Russian waters eastwards of 174 E Russian w aters w estw ards of 174 E USA waters Fig. 17. Pollock catch in the Bering Sea, Fig. 18. Pollock catch and CPUE in the northwestern Bering Sea (Navarin( area), Catch, t Year Catch CPUE Number of days Number of days, 1^3

16 Fig. 19. Eastern Bering Sea pollock fishery estimates catch-at at-age age data (in number) for The 2 year-class is highlighted (AFSC data).

17 % 2 М = 26,26 см % Длина, см % 2 15 М = 37,73 см % Fig. 2. Northwestern Bering Sea (Navarin area) pollock fishery catch-at-age and length data for the autumn period % Длина, см 2 М = 35,58 см Длина, см % Возраст, лет

18 Fig. 21. Stock assessment and TAC adoption in Russia Stock Assessment and TAC adoption in Russia Research for Fisheries Stock Assessment (ecosystem surveys, fishery data, modeling) Special Research Plan Team (Spetsovet) (pollock, salmon, herring, crabs, freshwater stocks, etc.) Laboratory Product (tentative TAC estimation) Regional Fishery Management Council (Local Fishery Administration, Fishery Research Institutes, Mass Media and NGOs, such as Fishing Companies) NGOs Regional Research Advisory Panel (Uchenyi Sovet), followed by Central Research Advisory Panel Public Hearings GOs (Local Fishery Administration, Fishery Agency, Ministry of Nature, Ministry of Agriculture, etc.), Fishing Companies, Fishery Research Institutes, Mass Media, NGOs (Conservation Groups, Fishery Associations, and representatives of local communities, local citizens, etc.) Ecological Expert Group Ministry of Nature selects top experts among scientists, working for Academy of Science, Universities, Research Institutes (including Fishery Research Institutes) Approval of TAC assessment by Fishery Agency

19 Thank You!

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