Alexander I. GlubokovAlexander I. Glubokov

SpawningFeeding

Pre-wintering

Geneticstudies

Ichtyo-plankton surveys

Bottom trawl surveys

Echointeg-ration trawl

surveys

Recruitment trawl surveys

New techniques

Geneticstudies

Echointeg-ration trawl

surveys

Recruitment trawl surveys

Ichtyo-plankton surveys

Bottom trawl surveys

Conventional techniques

Knowledge of seasonal migrations and biology data on stability of spawning grounds, clear picture of the population structure of Bering Sea pollock

No data on seasonal migrations, stability of spawning grounds, conflicting data on Bering Sea pollock population structure

Once a year Repeated during the year

Not annual

Chart of methods to study the North Bering Sea pollockChart of methods to study the North Bering Sea Chart of methods to study the North Bering Sea pollockpollock

1998 October-December

JMT «Kaie-maru №28» Bottom trawl, echo-integration trawl surveys D.O.Alekseev 1,S.M.Goncharov 1

1999 June-August JMT «Kaie-maru №28» Bottom trawl, recruitment trawl surveys V.A. Bizikov 1,A.I.Glubokov 1

1999 August-October JMT «Kaie-maru №28» Bottom trawl survey A.A. Bonk 2,Y.A Fedorets 3

1999 November-December

JMT «Kaie-maru №28» Bottom trawl, recruitment trawl surveys D.O.Alekseev 1,V.A. Bizikov 1

2000 April-May RTMS «Novokievka» Ichthyoplancton survey A.M.Privalihin 1, A.V.Startsev 3

2000 June-August JMT «Kaie-maru №28» Bottom trawl, recruitment trawl surveys D.O.Alekseev 1,A.I.Glubokov 1

2000 September-October

JMT «Kaie-maru №28» Bottom trawl, echo-integration trawl surveys S.B.Popov 1,D.A.Terentiev 2

2000 November-December

JMT «Kaie-maru №28» Bottom trawl, recruitment trawl surveys S.V.Moiseev 1,E.V.Slobodskoy 3

2001 April-May BMTR «Nikolay Chepik» Ichthyoplancton survey I.N.Kireev 2,A.V.Hodokhov 1

2001 May-July JMT «Kaie-maru №28» Bottom trawl, recruitment trawl surveys A.I.Glubokov 1,Y.A Fedorets 3

2001 July-August BMRT «Haiduk» Ichthyoplancton survey V.I.Kudriavtsev 1,G.V.Norvillo 1

2001 August-October JMT «Kaie-maru №28» Bottom trawl, recruitment trawl surveys D.O.Alekseev 1,R.N.Novikov 2

2001 October-December

JMT «Kaie-maru №28» Bottom trawl, echo-integration trawl surveys S.B.Popov 1,D.A.Terentiev 2

2002 March-April JMT «Kaie-maru №28» Ichthyoplancton survey D.O.Alekseev 1,A.I.Glubokov 1

2002 August-October JMT «Kaie-maru №28» Bottom trawl, recruitment trawl surveys A.O. Zolotov 2

2002 October-December

JMT «Kaie-maru №28» Bottom trawl, echo-integration trawl, recruitment trawl surveys

A.A.Bonk 2,S.B.Popov 1

2003 October-November

BATM «Pioner Nikolaeva» Bottom trawl, echo-integration trawl, mid-layer trawl surveys

A.I.Glubokov 1,S.B.Popov 1

2003 October-November

RTMS «Bagration» mid-layer trawl surveys A.A. Balanov 4,A.V.Buslov 2,

A.O. Zolotov 2,G.V.Norvillo 1,

A.V.Hodokhov 1

List of cruises and types of work the resultsList of cruises and types of work the resultsof which were usedof which were used

Totally:over 50 months duration

21 trawl surveys11 echointagration trawl surveys8 recruitment trawl surveys5 ichthyoplankton surveys

Totally:Totally:over 50 months duration over 50 months duration

21 trawl surveys21 trawl surveys11 11 echointagrationechointagration trawl surveystrawl surveys8 recruitment trawl surveys8 recruitment trawl surveys5 5 ichthyoplanktonichthyoplankton surveyssurveys

Area of studiesArea of studiesArea of studies

Concentration: - Olyutor – Karagin; - Koryak; - Navarin; - Matveev; - Pribiloff; - Unimak-Bristol

1 2 3 45 6

Spatial distribution of pollock in periods of low and medium abundance

Spatial distribution of Spatial distribution of pollockpollock in periods of low and in periods of low and medium abundancemedium abundance

Migration routes of navarin pollock(late 20-th and

early 21-st centuries)

Migration routes of Migration routes of navarinnavarin pollockpollock(late 20(late 20--th and th and

early 21early 21--st st centuries)centuries)

Migration routes of pollock in Karagin subzonein 1970-s.

Migration routes of Migration routes of pollockpollock in in KaraginKaragin subzonesubzonein 1970in 1970--s.s.

- main spawning grounds; Roman numbers – months of intensive spawning

Spatial differentiation of the main spawning grounds of pollock in the Bering Sea (after Stepanenko, 2003;

Bulatov, 2004; Glubokov, 2005)

Spatial differentiation of the main spawning grounds of Spatial differentiation of the main spawning grounds of pollockpollock in the Bering Sea (after in the Bering Sea (after StepanenkoStepanenko, 2003; , 2003;

BulatovBulatov, 2004; , 2004; GlubokovGlubokov, 2005), 2005)

Nor

th a

nd W

est B

erin

g Se

a po

llock

ogyv

as, b

y ar

eas

(aut

hor’s

dat

a).

Nor

th a

nd W

est B

erin

g Se

a N

orth

and

Wes

t Ber

ing

Sea

pollo

ckpo

llock

ogyv

asog

yvas

, by

area

s (a

utho

r, b

y ar

eas

(aut

hor ’’ s

dat

a).

s da

ta).

2002

0

20

40

60

80

100

25 29 33 37 41 45 49length, cm

shar

e of

mat

ure,

%

самки Олютор самцы Олютор

2001

0

20

40

60

80

100

25 29 33 37 41 45 49length,cm

shar

e of

mat

ure,

%

самки Наварин самцы Наваринсамки Коряк самцы Коряк

0

2 0

4 0

6 0

8 0

1 0 0

2 9 3 3 3 7 4 1 4 5 4 9le ng th,c m

shar

e of

mat

ure,

%

O lyuto r fem a les O lyuto r m a les

b2000

0

20

40

60

80

1 00

25 29 33 37 41 45 49leng th,cm

shar

e of

mat

ure,

%

сам ки Навар ин сам цы Навар ин

сам ки Олю то р сам цы Олю то рNavarin femalesOlyutor females

Navarin malesOlyutor males

Navarin femalesKoryak females

Navarin malesKoryak males Olyutor females Olyutor males

20001999

0,54

0,58

0,62

0,66

Cub

ic c

ondi

tion

inde

x

XI-XII1998

VI1999

XI-XII1999

VII2000

VI-VII2001

VIII2001

IV2002

navarin region koryak region olyutor region

Cubic condition index by Clark in mature pollock, by area and year

Cubic condition index by Clark in mature Cubic condition index by Clark in mature pollockpollock, by , by area and yeararea and year

3

5

7

9

11

GSI

, %

females males

navarin region olyutor regionkronotskiy bay

Gonadosomatic index in mature pollock in October –November 2003 in northern and western regions of the

North Pacific

GonadosomaticGonadosomatic index in mature index in mature pollockpollock in October in October ––November 2003 in northern and western regions of the November 2003 in northern and western regions of the

North PacificNorth Pacific

A

B

Gonadosomaticindex in females (A)

and males (B) of pollock from various

areas of the North and East Bering Sea,

by age (July 2004)

GonadosomaticGonadosomaticindex in females (A) index in females (A)

and males (B) of and males (B) of pollockpollock from various from various

areas of the North areas of the North and East Bering Sea, and East Bering Sea,

by age (July 2004)by age (July 2004)

0

2

4

6

8

10

HSI

, %

VI 98 VII 98 VI 99 VII 00 VI 01 VII 01

navarin region koryak region olyutor region

Hepatosomatic index in mature female pollock in the early feeding period in the Northwest Bering Sea,

by area

HepatosomaticHepatosomatic index in mature female index in mature female pollockpollock in the in the early feeding period in the Northwest Bering Sea, early feeding period in the Northwest Bering Sea,

by areaby area

Pollock genetic sampling sites, 1997-2004Pollock genetic sampling sites, 1997Pollock genetic sampling sites, 1997--20042004

East Bering Sea

Karagin Bay

Shirshov RidgeOlyutor Bay

North Kuril

0,1

Unrooted Nei genetic distance tree between various concentrations of pollock

UnrootedUnrooted NeiNei genetic distance tree between various genetic distance tree between various concentrations of concentrations of pollockpollock

Navarin

- stock nucleus; - main migration routes; - migration routes in periods of high abundance; - population range in periods of high abundance.

Scheme of pollock population structure in the North Bering Sea and adjacent waters

Scheme of Scheme of pollockpollock population structure in the North population structure in the North Bering Sea and adjacent watersBering Sea and adjacent waters