Coastal monitoring the state of pink shrimp Pandalus borealis population on West Kamchatka


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Coastal monitoring  the  state of  pink  shrimp 

Pandalus 

borealis 

population on West Kamchatka



Oksana G. Mikhailova

Junior  scientist of Kamchatka Research Institute of Fisheries and 

Oceanography (KamchatNIRO)


Major sites of commercial  harvesting of pink shrimp in Russian 

waters area

Japan Sea

Okhotsk Sea



Short of preface

Before the 1970s, when the 200-mile economic zone was set, the 

resource was exploited solely by commercial fleet of Japan, but the 

exploiting stopped. 

The interest to the resource renewed in 1993, when laboratory of

 

Marine Commercial Invertebrates was formed in KamchatNIRO and 



commercial aggregations of pink shrimp, mentioned in Russian and

 

foreign literature, have been interesting again to investigate. 



Since 1997 the number of vessels engaged into the fishery of pink 

shrimp in the Kamchatka-Kuril subzone has been growing, and by 2004 

it reached 29 units. 

Sustainability of fishing, which has began, required having regular 

data about stock abundance of the resource and figuring out the 

TAC. 


Specialized shrimp fishing vessels

Built in 1985, length –

 

48.250 m, width –



 

11.0  m,    draught  –

 

5.5  m,  power  of 



general  engine -

 

2250 l/sec, speed –



 

knots. The fishing gear used was shrimp 



bottom pair trawl «Cosmos-2005»

 

made 



in  Denmark.  The  mesh  of  the  trawl 

wings is 20 mm, the opening -

 

35х2 m. 


The  trawl    has  temperature  and  depth 

sensors  and  selective  greed,  set  in  not 

far from entrance.

Built  in  1985  ,  length

 



 



51.0  m,  width

 



 

9.5  m,  draught

 



 



6.0  м

 

,  power  of 



general  engine –

 

1800 л.с., speed



 

 



11 

knots,  The  fishing  gear    used  was 

shrimp

 

bottom



 

trawl  «Cosmos-3000»

 

made in Denmark.



 

The mesh of the trawl 

wings  is

 

24  mm,  the  opening  -



 

64  м, 


The  trawl    has  temperature  and  depth 

sensors  and  selective  greed,  set  in  not 

far from entrance.


The data obtained on the fishing vessels in 2001-2011 as a 

result of monitoring of  pink shrimp population.

Year

Vessel


The number 

of trawlings

The number of 

analyzed individuals

2001

M/V


 

«Sapfir-1»

101

14580


2002

M/V


 

«Asanda»


21

1585


2004

M/V


 

«Alitus»


33

3783


2005

M/V


 

«Aleksandrit»

21

676


169

5086


2006

M/V


 

«Sapfir-1»

118

3495


2007

M/V


 

«Sapfir-1»

28

2547


2008

M/V


 

«Aleksandrit»

22

2519


M/V

 

«Sapfir-1»



24

2458


2009

M/V


 

«Aleksandrit»

55

-

2010



M/V

 

«Sapfir-1»



251

3619


2011

M/V


 

«Aleksandrit»

60

3754


The total sample size analyzed is 44102 shrimps, including 12439

 

in spring and 



31663 in autumn.

General results obtained in the course of monitoring of pink 

shrimp populations from fishing vessels.

- Distribution

-

 



The correlation between the catches of shrimp and water temperature 

near the bottom

-

 

Correlation between vertical distribution and functional condition of 



females

-

 



The size ratio in the population

-

 



Age structure of the population

etc. 


The aggregations of pink shrimp near the south-west coast of 

Kamchatka



The distribution of pink shrimp in spring-winter and autumn periods 

near the south-west coast of Kamchatka



The catches of pink shrimp in different temperature ranges

on spring data

on summer-fall data

Minimal catches

Maximal catches

Average catches



0

20

40

60

80

100

S

h

ar

e o

f i

n

d

ivi

d

u

al

s,

 %

2010

2011

2010

2010

2011

2010

march

april

august

september

200-300

300-400

400-500

The distribution of female pink shrimps depending the depth and 

season


0

5

10



15

20

5



20

35

50



65

80

95



110 125 140

Lenght, mm

S

har


of

 indi



vi

dual


s,

 %

Juvenile



Male

Transitional

Female

The ratio between different functional groups in the population in 



the course of maturation of pink shrimp

The size-age composition of pink shrimp in the 

catches near the south-west coast of Kamchatka 

3+

4+

5+



6+

7+

8+



75,2

93,1


107,5

119,0


128,3

135,8


Length,mm

Age, year



16%

24%


23%

23%


11%

3%

3+



4+

5+

6+



7+

8+

The ratio between different age groups of pink shrimp in the 



catches near the south-west coast of Kamchatka

Schematic life history of pink shrimp near the south-west 

coast of Kamchatka

3 –

 

4 month



0+

1+ 2+


3+

4+

5+



6+

7+

8+



Larval

Female


Larvae

Juvenile


Male

Transitional

Female


Stock abundance dynamics of pink shrimp in Kamchatka-Kuril 

subzone in 2002-2011 on the data obtained on commercial 

fishing vessels

16,5


8,2

7,7


8,1

5,6


5,9

6,5


7

8,3


10,9

0

5



10

15

20



S

toc


k,

 t

hous



and 

tons


2002 2003 2004 2005 2006 2007 2008 2009 2010 2011

Pros

and 


cons

of pink shrimp monitoring from commercial 

fishing vessels

Cons

Pros

The time of data sampling is 

limited

To get information about ecology and 



biology of the shrimp

There is no a stable scheme of 

sampling

To get information about hydrology

The area of observation is limited 

due to narrow interests of 

commercial fishing

To analyze several commercial 

characteristics

To have a huge biostatistical data 



pool

To get basis data for the forecast



Thank you for your attention

Document Outline

  • Slide Number 1
  • Slide Number 2
  • Short of preface
  • Specialized shrimp fishing vessels
  • The data obtained on the fishing vessels in 2001-2011 as a result of monitoring of  pink shrimp population. 
  • Slide Number 6
  • The aggregations of pink shrimp near the south-west coast of Kamchatka
  • The distribution of pink shrimp in spring-winter and autumn periods near the south-west coast of Kamchatka
  • The catches of pink shrimp in different temperature ranges
  • Slide Number 10
  • Slide Number 11
  • The size-age composition of pink shrimp in the catches near the south-west coast of Kamchatka
  • Slide Number 13
  • Slide Number 14
  • Stock abundance dynamics of pink shrimp in Kamchatka-Kuril subzone in 2002-2011 on the data obtained on commercial fishing vessels
  • Pros and cons of pink shrimp monitoring from commercial fishing vessels
  • Slide Number 17



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