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LONGLONG--TERM VARIABILITY OF PELAGIC FISH SPECIES COMPOSITION TERM VARIABILITY OF PELAGIC FISH SPECIES COMPOSITION
NEAR THE SAKHALIN (SEA of OKHOTSK): DISTRIBUTION, NEAR THE SAKHALIN (SEA of OKHOTSK): DISTRIBUTION,
FLUCTUATIONS IN ABUNDANCE, FISHERYFLUCTUATIONS IN ABUNDANCE, FISHERY
A. A. YaYa. Velikanov, SakhNIRO, Russia. Velikanov, SakhNIRO, Russia ee--mail: velikanov@ mail: velikanov@ sakhniro.rusakhniro.ru
Sakhalin Island
56532Number of planktivorous species with biomass >100 000 t
787–865Number of planktivorous species with biomass >10 0000 t
291415
341717
331617
321616
271512
Total planktivorous species PelagicDemersal
++++++–+++++++––++
++++++–+++++++++++
++++++++++++–+++++
+–+++++++++++–++++
–+–+++–++++–––++++
DEMERSAL FISH*Gadus macrocephalus (juv.)Eleginus gracious (juv.)Lumpenella longirostrisLumpenus sagittaLeptoclinus maculatesAmmodytes hexapterusHypoptichuss dybowskiiHexagrammus octogrammus (juv.)Hexagrammus lagocephalus (juv.)Blepsias cirrhosusHemitripterus viilosusHemilepidotus gilberti (juv.)Melletes papillio Podothecus acipenserinus Podothecus gilberti Eumicrotremus pacificusHippoglossoides elassodonLimanda sakhalinensis
+++++++++++––++––+
++++++++++++++++–+
++++++–+++–+++++++
++++++–+++–+++++++
++++++–+++–+++++––
PELAGIC FISH Clupea harengus Sardinops sagax Engraulis japonicusOncorhynchus keta (juv.)Oncorhncus gorbuschaOncorhynchus mazou (juv.)Oncorhynchus tschawyscha (juv.)Osmerus dentexHypomesus japonicus Mallotus villosus Leuroglossus schmidtiiSalangichthys microdonCololabis sairaTheragra chalcogrammaGasterosteus acelatus acelatus Arctoscopus japonicusScomber japonicusPleurogramus azonus (juv.)
North-eastern Sakhalin
South-eastern Sakhalin
Aniva Bay, La Perouse Strait
South-western Sakhalin
North western SakhalinSpecies
Species composition (+, species present; –, species absent) of pelagic and demersal planktivorous fish in different areas off Sakhalin Island (adapted from Lindberg, 1959; Borets, 1997).
Species composition (+, species present; –, species absent) of pelagic and demersal planktivorous fish in different areas off Sakhalin Island
(adapted from Lindberg, 1959; Borets, 1997).
AnadromousPelagicDemersal
Б
AnadromousPelagicDemersal
В
AnadromousPelagicDemersal
Г
AnadromousPelagicDemersal
Д
A
B
D
E
C
Proportion of pelagic, anadromous and
demersal
species in the epipelagic fish
communities in different regions of eastern S a k h a l i n : 1947-1997 -
northeastern Sakhalin (A), southeastern Sakhalin (B), Aniva Bay (C); 2002-2004 -
Aniva Bay (D); 2005-
Aniva Bay ( E )
Pelagic fish species composition
AnadromousPelagicDemersal
А
A
Lamna ditropisEngraulis japonicusMallotus villosusSalmonPleurogrammus azonusOthers
A
Lamna ditropisClupea pallasiEngraulis japonicusMallotus villosusSalmonPleurogrammus azonusOthers
Б
Lamna ditropisClupea pallasiEngraulis japonicusMallotus villosusSalmonPleurogrammus azonusOthers
В
Lamna ditropisClupea pallasiEngraulis japonicusMallotus villosusSalmonPleurogrammus azonusOthers
Г
Leuroglossus schmidtiMallotus villosusPleurogrammus azonusOthers
А
Leuroglossus schmidti
Clupea pallasi
Mallotus v illosus
Pleurogrammus azonus
Others
Б
Leuroglossus schmidti
Clupea pallasi
Engraulis japonicus
Mallotus villosus
Pleurogrammus azonus
Others
В
Leuroglossus schmidti
Clupea pallasi
Engraulis japonicus
Mallotus v illosus
Pleurogrammus azonus
Others
Г
A
B
C
D
Biomass and abundance proportion of pelagic fish species in the Aniva Bay upper epipelagic zone and adjoining areas of the Sea of Okhotsk: A –
2002; B –
2003; C –
2004; D-
2002-2004Biomass Abundance
Data of south-latitude fishes occurred near the Okhotsk Sea coast of Sakhalin Island in
different years
Fish species Aniva Bay Eastern Sakhalin
English name Latin name 1947-1949(Lindberg,1959)
2000-2008 1947-1949(Lindberg,1959)
2000-2008
Salmon shark Lamna ditropis + +(2002-2005; 2007)
+ +(2002-2004; 2008)
White shark Carcharodon carcharias
_ +(2007)
_ _
Pacific sardine Sardinops melanostictus
? +(2006-2007)
? +(2001-2004)
Japanese anchovy Engraulis japonicus _ +(2003-2008)
_ +(2000-2004; 2008)
Pacific saury Cololabis saira + _ + +(2000-2001)
Green gar Strongilura anastomella
_ +(2008)
_ _
Rockfish Sebastes schlegeli + +(2006)
_ _
Rockfish Sebastes wakiyai _ +(2001)
_ _
Common dolphin-fish Coryphaena hippurus _ +(2000)
_ +(2004)
Chub mackerel Scomber japonicus + +(2000)
_ +(2008)
Swell fishes puffers Takifugu porphyreus + +(2003; 2008)
_ _
143 144 145 146 14748
49
50
51
52
53
54
0.01
1
2
3
4
5
6
7т/кв милю
143 144 145 146 14748
49
50
51
52
53
54
0.01
0.1
0.2
0.3
0.4
0.5
0.6
0.7т/кв милю
А Б
143°00' 144°00' 145°00' 146°00'
49°00'
50°00'
51°00'
52°00'
53°00'
54°00'
т/кв.милю
0.01
0.1
1
10
12
143 144 145
47
48
49
50
51
52
53
0.01
0.05
0.1
1
10
50
Ðèñ.3.3 - Ðàñï ðåäåëåí èå ñåëüäè ó âî ñòî ÷í î ãî Ñàõàëèí à â ñåí òÿáðå-î êòÿáðå 2004 ã. (ò/êâ.ì èëþ )
02468
1 01 21 41 61 82 02 22 4
7 8 9 1 0 1 1 1 2 1 3 1 4 1 5 1 6 1 7 1 8 1 9 2 0 2 1 2 2 2 3 2 4 2 5 2 6 2 7 2 8 2 9 3 0 3 1 3 2 3 3 3 4 3 5 3 6 3 7
Д л и н а т е л а , с м
%
и ю н ь N = 3 3 5 э к з , M = 2 8 . 9 3 с м А
0
2
4
6
8
1 0
1 2
1 4
1 6
1 8
2 0
7 8 9 1 0 1 1 1 2 1 3 1 4 1 5 1 6 1 7 1 8 1 9 2 0 2 1 2 2 2 3 2 4 2 5 2 6 2 7 2 8 2 9 3 0 3 1 3 2 3 3 3 4 3 5 3 6 3 7
Д л и н а т е л а , с м
%
с е н т я б р ь - о к т я б р ь N = 3 5 2 э к з , M = 1 9 . 4 7 с м Б
0.0
5.0
10.0
15.0
20.0
25.0
30.0
35.0
40.0
9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33Длина, см
Доля,
%
Глубина 240, горизонт 70-115 мГлубина 220, горизонт 5-35 мГлубина 68, горизонт 35-65 м
N=100 экз., Ср.=28.4 смN=88 экз., Ср.=28.3 см
N=113 экз., Ср.=15.2 см
Distribution of pelagic fishes
Distribution of herring along the eastern Sakhalin coast (from left to right: October 2002; July 2002; August 2003; September-October 2004)
Length-size composition of herring trawl catches near northeastern Sakhalin: Left –
July 2002 (A); October 2002 (B); right –
June 2007
A
B
1 4 3 1 4 4 1 4 5 1 4 64 8
4 9
5 0
5 1
5 2
5 3
5 4
1 0
5 0
1 0 0
5 0 0
1 0 0 0
5 0 0 0
142.5 143.0 143.5 144.0 144.5 145.0 145.546.00
46.50
47.00
47.50
48.00
48.50
49.00
49.50
1
5
10
50
100
200
142.0 142.5 143.0 143.5
45.40
45.90
46.40
46.90
0.5
1
5
10
20
143°00' 144°00' 145°00' 146°00'
49°00'
50°00'
51°00'
52°00'
53°00'
54°00'
0.01
0.1
1
10
100
350
т/кв.милю
143 144 145
47
48
49
50
51
52
53
0.1
0.5
1
5
10
15
20
21
Ðèñ.3.1 - Ðàñï ðåäåëåí èå ì èí òàÿ ó âî ñòî ÷í î ãî Ñàõàëèí à â ñåí òÿáðå-î êòÿáðå 2004 ã. (ò/êâ.ì èëþ )
1
100
1000
5000
10000
21000
êã/êâ.êì
143°00' 144°00' 145°00' 146°00'49°00'
50°00'
51°00'
52°00'
53°00'
54°00'
55°00'
.
Distribution of walleye pollock near the eastern Sakhalin coast in 2002 (from left to right: northeastern Sakhalin, September-October; southeastern Sakhalin and
Aniva Bay, August-September).
Distribution of walleye pollock near the northeastern Sakhalin coast (from left to right: August 2003, October 2004 and 2005)
X=3.12
02468
1012141618
1996 1997 1998 1999 2000 2001 2002 2003 2004 2005
Ряд1
X=8.83
0
5
10
15
20
1996 1997 1998 1999 2000 2001 2002 2003 2004 2005
Ряд1
X=15.63
0
5
10
15
20
25
30
35
1996 1997 1998 1999 2000 2001 2002 2003 2004 2005
Ряд1
X=11.25
0
5
10
15
20
25
30
35
1996 1997 1998 1999 2000 2001 2002 2003 2004 2005
Ряд1
D
Dynamics of abundance index of pink salmon in different regions of eastern Sakhalin in 1996-2005 (top-down: northeastern Sakhalin; Terpeniya Bay; southeastern Sakhalin;
Aniva Bay).
142.00 143.00 144.00 145.00 146.00 147.0045.00
46.00
47.00
48.00
49.00
50.00
51.00
52.00
53.00
54.00
55.00
- улова нет- 0.01-5.0 кг/час траления
- 5.1-10.0 кг/час траления
- 10.1-50.0 кг/час траления
- 50.1-110.0 кг/час траления
142 143 144 145 146 147 148 14944
45
46
47
48
49
50
51
52
53
54
55
нет1-5051-100101-10001001-50005001-20000
Улов, шт/траление
143 144 145
47
48
49
50
51
52
53
0.005
0.01
0.05
0.1
0.2
0.3
0.4
0.41
Ðèñ.3.4 - Ðàñï ðåäåëåí èå ì î éâû ó âî ñòî ÷í î ãî Ñàõàëèí à â ñåí òÿáðå-î êòÿáðå 2004 ã. (ò/êâ.ì èëþ )
Distribution of capelin near the eastern Sakhalin coast (from left to right: pelagic trawl survey -
June-July 2002, June-August 2003; bottom trawl survey -
September-October 2004)
141 142 143 144 145 146
46
47
48
49
50
51
52
53
54
55
Охотское море
Тата рс кий пр
о лив
Залив Терпения
о . Моне рон ЗаливАнива
нет
2
102
141 142 143 144 14545
46
47
48
142.00 142.50 143.00 143.50
45.40
45.90
46.40
46.90
1.00
5.00
10.00
15.00
т/кв.милю
143 144 145 14648
49
50
51
52
53
54
0.1
1
5
10
15
Distribution of sand-lance near the northeastern Sakhalin coast in September-October 2002 (bottom trawl survey)Photo of sand –lance from pelagic trawl catches near
the
northeastern Sakhalin coast in
July 2002
Distribution of sand-lance in Aniva Bay and La Perouse Strait in June 2004 (left fig.) and 2006 (bottom trawl survey)
Distribution of sand-lance inshelf waters of Sakhalin Island
142.00 143.00 144.00 145.00 146.00 147.0045.00
46.00
47.00
48.00
49.00
50.00
51.00
52.00
53.00
54.00
55.00
- улова нет- 1-10 экз./час траления- 11-50 экз./час траления
- 51-100 экз./час траления
- 101-200 экз./час траления
- более 200 экз./час траления
142 143 144 145 14645
46
47
48
нет1-5051-100101-200201-400
Улов, шт/траление
142 143 144 14545
46
47
48
нет1-100101-500501-1000
Улов, шт/траление
142 143 144 14545
46
47
48
нет1-100101-500501-10001001-20002001-5000
Улов, шт/траление
Distribution of arabesque greenling in Aniva Bay and adjoining waters (pelagic trawl survey:
left panel -
June-July 2002, central panel -
June-July 2002-2004; bottom trawl survey:
right panel (top-down) –
October-November 2000, August-
September 2002, August 2005)
“Aniva Bay and La Perouse Strait are the only region where arabesque greenling demersal
aggregations were found in the Okhotsk Sea waters of Sakhalin Island, including aggregations of adult fishes (2005)”
Boundaries of maximal distribution of the fishing congestions of
the sardineduring 1987-1989 (Zhigalin, Belayev, 1999)
140° 145° 150° 155°
45°
50°
55°
60°
141 142 143 144 145 146 147 148 14944
45
46
47
48
нет1-100101-500501-10001001-20002001-6000
Улов , шт/траление
141.0 141.5 142.0 142.5 143.0 143.5 144.0 144.5
46.0
46.5
47.0
47.5
48.0
1-10
11-50
51-120
нет улова
Улов: шт/траление
140 142 144 146 14844
46
48
50
52
54
Anchovy
05
101520
25 30 5 10 15 20 25 30 5 10 15 20 25 30 5 10 15 20 25 30 July August September October
%
A
S u rfa c e w a t e r t e m p e ra t u re -S W
02468
1 01 21 41 61 82 0
2 5 3 0 5 10 15 2 0 2 5 3 0 5 10 15 2 0 2 5 3 0 5 10 15 20 2 5 3 0J u ly A u g u s t S e p t e m b e r O c t o b e r
°C
B
Distribution
of Japanese
anchovy
catches
in
the
Sea
of
Okhotsk(from
left
to
right: summer1999, Merzlaykov,Temnykh, 2002; summer 2004 and summer 2008)
Distribution
of Japanese
anchovy
near the Sakhalin coast in
summer-
autumn 2002
Dynamics
of Japanese
anchovy
frequency
and water
surface
temperature
in
a zone
of deep
waters
near
southeastern
Sakhalin
in
1999
140 145 150 155
45
50
55
60
Pacific saury
0
10
20
30
25 30 5 10 15 20 25 30 5 10 15 20 25 30 5 10 15 20 25 30
July August September October
%
A
Surface water temperature -SW
02468
101214161820
25 30 5 10 15 20 25 30 5 10 15 20 25 30 5 10 15 20 25 30July August September October
°C
B
Left Fig. Distribution
of saury catches
(thousand
ind./sq. km) in
the
Sea
of Okhotsk in
summer-autumn
1999 (from
Merzlyakov, Temnykh, 2002)Right Fig. Dynamics of Pacific saury frequency and water surface
temperature in a zone of deep waters near the southeastern Sakhalin in 1999
South-latitude fish found in the Sea of Okhotsk (north boundaries)
near Sakhalin Island in different decades
Species 1930-
19391940-
19491950-
19591980-
19891990-
19992000-
2008Source
Pacific sardine
52°00’ 46°40’ 48°40’ 48°40’ 53°20’ Taranets, 1937; Druzhinin,Darda,1963; Zhigalin, Belayev,1999; Velikanov,2006
Japanese anchovy
46°40’ 49°00’ 53°00’ 54°20’ Darda,1968;Velikanov,2001;2004;2006;Mukhametova, 2004
Pacific saury 49°00’ 47°00’ 50°00’ Lindberg,1959; Velikanov,2003;2006;
Filatov,2005
Daggertooth 47°38’ Own data, 1996
Common dolphin-fish
46°30’ 47°18’ Poltev, Sergeenko,
2001; Nazarkin,Gudkov,2006
Longnose
lancetfish46°50’ 46°39’ Ilinskiy, 1998; Velikanov, 2003
White shark 46°35’ Own data, 2007
Swell fishes puffers
46°30’ Velikanov, Stominok,
2004
Chub mackerel
46°00’
-
46°30’
46°21’ Lindberg,1959; Velikanov,Stominok, 2004; Own
data, 2008
1 42 1 43 1 44 1 45 1 4645
46
47
48
нет1-10
Улов, шт /траление
142 143 144 145 14645
46
47
48
1 42 1 43 1 44 1 45 1 4645
46
47
48
нет1-100101-500501-20002001-5000
Улов, шт /траление
нет1-100101-200201-500501-100022000
Улов, шт /трал ение
141.0 141.5 142.0 142.5 143.0 143.5 144.0 144.5
46.0
46.5
47.0
47.5
48.0
1-3
4-20
21-50
нет улова
Улов: шт/траление
0
5
10
15
20
25
30
35
6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28
Длина тела, см
% встречаемости
2003 год N=743 экз, M=9.46 см2004 год N=575 экз, M=13.62 см
2003
2004
Distribution of juvenile herring in Aniva Bay and adjacent waters in June-July 2002-2004 and 2008
2002
2008
Length composition of herring from the pelagic trawl catches
in Aniva Bay and adjacent waters in summer 2003-2004
Changing of spawning ground productivityLocation of herring spawning grounds near the southern coast of Sakhalin in 1955 (Rumyantsev et al,1958)
142 143 144 14545
46
47
48
нет1-1011-20
Улов, шт/траление
142 143 144 14545
46
47
48
142 143 144 14545
46
47
48
нет1
Улов, шт/траление
нет1-56-5051-100101-200
Улов, шт/траление
143 144 145 146
49
50
51
52
53
54экз./0.5 кв. м
1000 м
500 м
100 м
О Х О Т С
К О Е
М О
Р Е
о. С
АХАЛ
ИН
1
10
100
300
400
141 142 143 144 14545
46
47
48
49
50
51
52
53
54
55
0
50
100
150
200
250
280
300
о. Сахалин
0
0.2
0.4
0.6
0.8
1
1.2
2000 2001 2002 2004 2005 2006 2007 2008
Ряд1
х1013
Distribution of juvenile walleye pollock in Aniva Bay and adjacent waters in June-July
2002-2004
(top-down)
Dynamics of abundance index of walleye pollock floating eggs near the northeastern Sakhalin coast in 2000-2008
Spatial distribution of walleye pollock floating eggs near the northeastern Sakhalin coast in June 2007 (left)
and early July 2008 (right)
142 143 144 14545
46
47
48
142 143 144 14545
46
47
48
нет1-5
Улов, шт/траление
142 143 144 14545
46
47
48
нет1-5
Улов, шт/траление
Улов, шт/траление
нет1-5051-1 00101 -5 005 01-20 00
141.0 141.5 142.0 142.5 143.0 143.5 144.0 144.5
46.0
46.5
47.0
47.5
48.0
1-10
11-100
101-1750
нет улова
Улов: шт/траление
N=368 шт., М=25.5 см.
-5
5
15
25
35
20 21 22 23 24 25 26 27 28 29
Длина АС, см
%
2004
N=102 шт., М=25.8 см.
0
10
20
30
40
21 22 23 24 25 26 27 28 29
Длина АС, см
%
2006
0
5
10
15
20
25
6 8 10 12 14 16 18 20 22 24 26 28Длина АС, см
%
1976 г,n=5642,M=18.72 см 1982 г,n=2393M=17.6 см1985 г,n=540,М=16.4 см
В
Year 2002 2003 2004 2005 2006 2007 2008
Occurrence, % 2.3 2.7 4.3 10.0 1.2 0.0 50.0
Catch, ind./trawl 1-5 1-5 1-20000 1-30 1-2 0.0 1-1750
Number of stations 37 48 145 80 81 91 91
Distribution of juvenile sand-lance in Aniva Bay and adjacent waters in June-July 2002-2004 and
in July 2008 (top-down)
Occurrence and pelagic trawl catches of juvenilesand-lance in Aniva Bay and adjacent waters in June-July 2002-2008
Length composition of the bottom trawl catches
of sand–lance in the La Perouse Strait in June
2004 and 2006 (top) and in June-August 1976, 1982 and
1985 (bottom)
Year Aniva Bay South-Eastern Sakhalin
Egg concentration (х106
egg/m2)Spawning area (х106 m2)
Egg concentration (х106
egg/m2)Spawning area (х106 m2)
1979 3,14 –
15,90 0.60
1985 0.51-3.66
1986 0.26 –
0.67
1987 0.05-
1.28 0.50 0.08 -0,17 0.51
1988 0.01 –
2.10 0.71 0,01 –
8.77 0.89
1989 0.01 –
3.18 0.64
1985-1989 0.01 –
3.66 0.5-0.71 0.01 -
8,77 0.51-0.89
2000 0.004 –
0.145 0,30 –
0.70 0.50
2001 0.002 –
0.110 0,05 –
0,40 0.40
2002 0.049-
2.025 0.20 0.10 –
1,01 0.60
2003 0.009-
1.452 0.09 0.05 –
0.20
2004 0.007 –
0.196 0.15 0,01 –
0,19
2000-2004 0.002 –
2.025 0.09-0.20 0,01 –
1,01 0.40-0.60
Data of capelin spawning area and eggs concentration in Aniva Bay and near southeastern Sakhalin in different years
0
50
100
150
200
250
300
350
400
1950
1952
1954
1956
1958
1960
1962
1964
1966
1968
1970
1972
1974
1976
1978
1980
1982
1984
1986
1988
1990
1992
1994
1996
1998
Х 1000 тонн
0
20
40
60
80
100
120
1951
1955
1959
1963
1967
1971
1975
1979
1983
1987
1991
1995
1999
2003
2007
X100
0 to
ns
0
20
40
60
80
100
120
140
160
180
200
1952 1957 1962 1967 1972 1977 1982 1987 1992 1997
Года
Улов, тыс
.тонн
0
5
10
15
20
25
1940
1950
1960
1970
1980
x 10
000 t
Ряд1
0
50000
100000
150000
200000
250000
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
Tons
0
50
100
150
200
250
1976
1978
1980
1982
1984
1986
1988
1990
1992
1994
1996
1998
2000
2002
2004
X10
tons
Pink salmon
Sand-lance
Arabesque greenling
Walleye pollock
Pacific sardine
Herring
Dynamics of different pelagic fish catches in the southwestern part
of the Sea of Okhotsk in the second half of the 20th century
Abundance and Fishery
In the 20th century total maximal annual catches of herring, Pacific sardine, sand-lance, walleye pollock and pink salmon reached 1,0 million tons near the eastern Sakhalin. Long-term abundance fluctuations of northern and southern boreal species were characterized by comparatively smooth changes, which had been observed during 50-60 years. The time periods when high abundant subtropical species appeared in the investigation area were shorter, not more than 10-20 years.
Summary
•
Essential changes in species composition, distribution, abundance and annual catches of pelagic fishes took place in the Sea of Okhotsk near the Sakhalin Island during 1950 –
2008.•
At present, walleye pollock, herring and sand-lance are mostly abundant in the northern part of the study area (49 -
54°
N), whereas pink salmon, capelin, arabesque greenling and Japanese anchovy –
in the southern part (46 -
49°
N).•
The productivity of the southern spawning grounds for herring, walleye pollock, sand-
lance and capelin declined significantly during the last 30 years, whereas the productivity of pink salmon spawning grounds in Sakhalin southern rivers increased.
•
In 1990-2008 reproduction of Japanese anchovy and arabesque greenling was at the high level. Annually these species form feeding aggregations near the southeastern Sakhalin, but their spawning grounds are located far south of Sakhalin Island.
•
In the 20th century total maximal annual catches of herring, Pacific sardine, sand-
lance, walleye pollock and pink salmon reached 1,0 million tons near the eastern and southern Sakhalin.
•
Long-term abundance and catches fluctuations of boreal and subtropical pelagic fishes have essential difference in the Sea of Okhotsk near Sakhalin Island. Boreal species were characterized by comparatively smooth changes, which had been observed during 50-60 years. The time period when high abundant subtropical species appeared in the investigation area was shorter, not more
than 10-20 years•
A new wave of south-latitude fish migrations took place near the Eastern Sakhalin in
2000-2008; there were recorded almost 10 various species, including white shark, which was caught for the first time in Aniva Bay in 2007.
•
All above-mentioned changes in the epipelagic fish communities are related
with long-term changes in climate and oceanological regime.
•Thank you for attention
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