Part 3 (7.675Mb)

International Council for the Exploration of the sea

PART 3

C.M.1990/Assess:16

REPORT OF THE WORKING GROUP ON MEel:IRDeS STOCKS Nantes, France, 21-28 March 1990

This document is a report of a Working Group of the International Council for the Exploration of the Sea and does not necessarily represent the views of the Council. Therefore, it should not be quoted without consultation with the General secretary.

*General Secretary ICES

Palregade 2-4

DK-1261 Copenhagen K

Figure 4

Nephrops management units in ICES Division

Figure 4. 2. - Nephrops management units in ICES Sub-areas IV, VI and VII

Figure 4. 3. - Nephrops management units in ICES Sub-areas

V, VI, VII, VIII and IX

I la

~~~·~~~-r+-r~~~~rV~b~1~VbJH-~+4~~~~ ··-'--'--

l-+·-+--+-t-+--t--+--+--+-t---+--if--t--1t---t"2::1'"'1 \,

~ ~ ~ ^{rt ,...}

~~

y

~-+-+-+-+-+-+~-+-+-+--+--l V 11 g - k '/; '/: ~

12' ' :2 11~

~

2

o}

:

VIII

1--t---t--t-t---t-+-~l ^'\

{

= ^X 1--t·-t-~+---+-+--t---t---1--t---t---t-t--+-+--+"~ "~q--;25;., ~'--""-'-- -...1--/

~-+--t---~1--t---t-~-~-r+-~+-+--t---~~~~26

V

+

i X : =~

- 1 -

?27

Figure 5 .1. -

1200

1000

800

T 0 600 N

400

200

1960 1965

Skagerrak and Kattegat (Management Units 3 and 4) Swedish Nephrops landings, by area, 1960-89

1970 1975 1980 1985 89•

0 Skagerrak 1111 Kattegatt

*Total

Figure 5.2. -

15

10

Aj [

\ ^j

0

-5

-10

Botney Gut - Silver Pit {Management Unit 5) detrended monthly LPUEs of Belgian Nephrops trawlers, 1980-89

Detrended LPUE (kg/hour> vs Month

.

... : ... ^; ...

..

~1onth <i=Jan 1980)

Figure 5.3. - Irish Sea East (Management Unit 14) : LPUE (in kg/hour trawling) of UK vessels, 1973-89 NEPQTY : quantity of Nephrops landed

TOTQTY : total quantity landed (per vessel)

-x- E & W vessels where f\EPQTY>25%TOTQTY at Whitehaven -v- E

W vessels where f\EPQTY>25%TOTQTY

Fleetwood 7

Nrish vessels

Whitehaven

··tr·

TOTAL 6

1970 1975 1980

YEAR ^{1985 1990}

~ (!)

..c

t;::

"--..

..c

(j)

5

w

Q_

_J

Figure 5.4. - Irish Sea East (Management Unit 14) : LPUE (in nos. /hour trawling and in kg/hour traw- ling) of UK vessels, 1985-88

IRISH SEA NEPHROPS, CUMBRIAN FISHERY

1000 MARKET SAMPLING, ANNUAL 1985-88 25

···V···

V,

800

~ LANDINGS(kg/h)

20

...

><"".x..

-o

--

600

15

v .. \.\

t;::

\

..c

\

"--..

O'l

400

\

10 c

\

w

\

x - - - x

Q_

_J

200 5

\V···V

0 0

1984 1985 1986 1987 1988 1989

YEAR

Figure 6

55

Ill

45

Q) (ij

E

_J

()

40

35

30

55 60

Iceland (Management Unit 1) : trends in mean size (carapace length in mm) of male and fe- male Nephrops in catches, 1960-89

ftCL males OCL females

65 70 75

90

Year

Figure 6.2. -

351- . . . .

30,... ..

Figure 6.3. -

35t- . . . .

Botney Gut - Silver Pit (Management Unit 5) trends in mean size (carapace length in mm) of male Nephrops in landings, market category

11

small

l980-89

'

.. -

. . -

O.•.lal'tel' < 1=1st <tlla!'tel' 1980)

Botney Gut - Silver Pit (Management Unit 5) trends in mean size (carapace length in mm) of female Nephrops in landings, market cate- gory "small

l980-89

. .

-

··~

Figure 6.4. -

451- ...

351- ....

Figure 6.5. -

4 5 - .

401-.

351- ....

Botney Gut - Silver Pit (Management Unit 5) trends in mean size (carapace length in mm) of male Nephrops in landings, market cate- gories "medium and large", 1980-89

...

..

....

..

:.

.. _

" " "

...

Quarter ( 1=1st quarter 1980)

Botney Gut - Silver Pit (Management Unit 5) trends in mean size (carapace length in mm) of female Nephrops in landings, market cate- gories "medium and large", 1980-89

. . .

.. ... _

. ^.

·.-

w

C)

z

<{

I

u

~

Figure 7

Iceland - males :

50

0

-50

relative changes in long-term landings and biomass, and short-term landings (i.e. after one year) in response to relative changes in effort

ICELAND (1)

males

-+- U~NDINGS LONG TERM - 8 - LANDINGS AFTER 1 YEAR -x- BIOMASS LONG TERM

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

~

r

^{1 1 7}

^{, -}

w

z

<(

I

u

~

Figure 7.2. - Faroe Islands - males :

100

50

0

-50

relative changes in long-term landings and biomass, and short-term landings (i.e. after one year) in response to relative changes in effort

FAROES (2)

males

-+-

-a-

~ BIOMASS LONG TERM

-100+--.--.--.~--,--.--.--.~--,-~~---r-~

0 0 0 0 0 0 0 0 0 0 0 0

~ ~ 7 1 ? T 7 ~ I

0 0 0

n '<!- I[)

w

z

I

u

~

Figure 7.3. - Faroe Islands - females :

50

0

-50

relative changes in long-term landings and biomass, and short-term landings (i.e. after one year) in response to relative changes in effort

FAROES (2)

females

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

m ro ~ ~ ~ ~ n N ~ ~ N n ^{~ ~}

I I I I I I I I I

--+-

-e-

w

<(

z

I

u

~

Figure 7.4. - Botney Gut and Silver Pit - males :

50

0

-50

relative changes in long-term landings and biomass, and short-term landings (i.e. after one year) in response to relative changes in effort

BOTNEY GUT + SILVER PIT (5)

males

-+- LANDiNGS LONG TERM -a- LANDINGS AFTER 1 YEAR - * - BIOMASS LONG TERM

g

R

g

g

g

w

z

:r: u

~

Figure 7.5. - Botney Gut and Silver Pit - females :

relative changes in long-term landings and biomass, and short-term landings (i.e. after one year) in response to relative changes in effort

50

0

-50

BOTNEY GUT + SILVER PIT (5)

females

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

m ro

n

n

I I I I I I I I I

-+-

-a-

-x-

w

z

<{

I

u

~

Figure 7.6. - Farn Deeps - males :

100

50

0

-so

relative changes in long-term landings and biomass, and short-term landings (i.e. after one year) in response to relative changes in effort

FARN DEEPS ( 6)

males

-+- LANDINGS LONG TERM

-e-

\

0 ~ 0

f

f ?

i

7

I

w

z

I

u

~

Figure 7.7. - Farn Deeps - females :

50

0

-50

relative changes in long-term landings and biomass, and short-term landings (i.e. after one year) in response to relative changes in effort

FARN DEEPS (6)

females

g g g g

g

9 ° 9

g

I I I I I I I I I

~ lANDINGS LONG TERM

-e-

w

z

u

~

Figure 7.8. - Fladen Ground - males :

50

0

-50

relative changes in long-term landings and biomass, and short-term landings (i.e. after one year) in response to relative changes in effort

FLADEN GROUND (7)

moles

-+-

---#---- BIOMASS LONG TERM

g

g g

g

g

w

C)

z

<(

I

u

~

Figure 7.9. - Fladen Ground - females :

50

0

-50

relative changes in long-term landings and biomass, and short-term landings (i.e. after one year) in response to relative changes in effort

FLADEN GROUND (7)

females

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

m ro ~ ~ ~ v ~ N ~ - N ~ v ~

I I I I I I I I I

crFORT

LANDINGS LONG TERM -a- LANDINGS AFfER 1 YEAR --*- BIOMASS LONG TERM

w

z

I

u

~

Figure 7.10. - Firth of Forth -males :

relative changes in long-term landings and biomass, and short-term landings (i.e. after one year) in response to relative changes in effort

FIRTH OF FORTH (8)

males

-+-

50

0

-50

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

~ ~ ~ r 1 r 7 7 ' -

~

~

CHANGE IN EFFORT

w

z

I

u

~

Figure 7.11. - Firth of Forth- females :

50

0

-50

relative changes in long-term landings and biomass, and short-term landings (i.e. after one year) in response to relative changes in effort

FIRTH OF FORTH (8)

females

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

m ro ~ ~ ~ ~ ~ N ~ ~ N ^{~ ~ ~}

I I I I I I I I I

-+--

--a-

w

C)

z

<(

I

u

~

Figure 7.12. - Moray Firth- males (1st run) :

50

0

-50

relative changes in long-term landings and biomass, and short-term landings (i.e. after one year) in response to relative changes in effort

MORAY FIRTH (9)

males (M=.3)

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

m ro I I ^~ I W I ~ I v I ~ I N I -I - N ~ v ~

-+-

-s-

w

z

I

u

~

Figure 7.13. - Moray Firth- males (2nd run) :

50

0

-50

relative changes in long-term landings and biomass, and short-term landings (i.e. after one year) in response to relative changes in effort

MORAY FIRTH (9)

males (M=.2)

-+- LANDINGS LONG TERM - B - LANDINGS AFTER 1 YEAR --*- BIOMASS LONG TERM

CHANGE IN EFFORT

w

z

:r: u

~

Figure 7.14. - Moray Firth - females (1st run) :

100

50

0

-so

relative changes in long-term landings and biomass, and short-term landings (i.e. after one year) in response to relative changes in effort

MORAY FIRTH (9)

females (imm M=.3 - mat M=.2)

-+-'- LANDINGS LONG TERM

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

m ro I I ~ I w I ~ I v I ~ I N I ~ I ~ N ~ v ~

-e-

w

c..?

z

:r: u

~

Figure 7.15. - Moray Firth- females (2nd run) :

1001 501

relative changes in long-term landings and biomass, and short-term landings (i.e. after one year) in response to relative changes in effort

MORAY FIRTH (9)

females (imm M=.3 mat M=.2 K=.1) -+-

-a-

ot---

-sol

-1 00 ---y-.,----,.---.--.---.---,

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

f f

r ^{1 1 7}

^I

w

0

z

<(

I

u

~

Figure 7.16. - Moray Firth- females (3rd run) :

100

50

0

-50

relative changes in long-term landings and biomass, and short-term landings (i.e. after one year) in response to relative changes in effort

MORAY FIRTH (9)

females (imm M=.2 mat M=.1 K=0.061

- t - LANDINGS LONG TERM

-a-

~ BIOMASS LONG TERM

-100+--r~r-,-~--r-,--r--r-o--T--r-~·-.-.

0 0 0 0 0 0 0 0 0 0 0 0 0

m

w

n

n

w

G

z

<(

I

u

!>-~

Figure 7.17. - North Minch -males :

50

0

-50

relative changes in long-term landings and biomass, and short-term landings (i.e. after one year) in response to relative changes in effort

NORTH M INCH ( 11)

males

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

m ro ~ ~ ~ ~ ~ N ~ N ^{~ ~ ~}

I I I I I I I I I

- I - LANDINGS LONG TERM

-e-

~ BIOMASS LONG TERM

w

( )

z

:r: u

~

Figure 7.18. - North Minch- females :

relative changes in long-term landings and biomass, and short-term landings (i.e. after one year) in response to relative changes in effort

100

50

0

-50

NORTH M INCH ( 11)

females

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

m I ~ ~ ~ ~ ~ ~ I I I I I I N I ~ I ~ N ~ ~ ~

-+- LANDINGS LONG TERM -a- LANDINGS AFTER 1 YEAR --*- BIOMASS LONG TERM

w

z

I

u

~

Figure 7.19. - South Minch- males :

100

50

0

-50

-100

relative changes in long-term landings and biomass, and short-term landings (i.e. after one year) in response to relative changes in effort

SOUTH M INCH ( 12)

males

--+-

~

g g

g

s

s

^g

I I I I 1 I 1 I

0

w z

I

u

~

Figure 7.20. - South Minch - females :

50

0

-so

relative changes in long-term landings and biomass, and short-term landings (i.e. after one year) in response to relative changes in effort

SOUTH M INCH ( 1 2)

females

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

m ro

m

v n

n v

--+--

w

0

z

I

u

!;{

Figure 7.21. - Clyde- males :

relative changes in long-term landings and biomass, and short-term landings (i.e. after one year) in response to relative changes in effort

CLYDE (13)

males

100

-+-

-a- LANDINGS AFTER 1 YEAR

\

50

0

-50

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

I

r 1 T 7

^I

w

c..?

z

:r: u

~

Figure 7.22. - Clyde- females :

relative changes in long-term landings and biomass, and short-term landings (i.e. after one year) in response to relative changes in effort

CLYDE (13)

females

--+-

""""""*-" BIOMASS LONG TERM

50

0

-50

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

7 f

r 1 T 7 7 ,

w

<{

1-

z w 0

w

w >

i= <{

_J ::::::>

~ :::>

0

Figure 7.23. - Irish Sea East : cumulative length frequency distributions of market samples, annualized,

100

-x-- 1985

-v-

·-0· 1987

·-11· 1988

80

60

40

20

0

15 20 25 30 35 40 45 50 55 60

CARAPACE LENGTH (mm)

w

z

I

u

~

Figure 7.24. - Irish Sea East- males :

50

0

-50

relative changes in long-term landings and biomass, and short-term landings (i.e. after one year) in response to relative changes in effort

E. IRISH SEA ( 1 4)

Males

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

m

I I I I I I I I I

-+- LANDINGS LONG TERM

-a-

w

z

I

u

~

Figure 7.25. - Irish Sea East - females :

100

50

0

-50

relative changes in long-term landings and biomass, and short-term landings (i.e. after one year) in response to relative changes in effort

E. IRISH SEA ( 1 4)

Females

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

m

m

n

n

I I I I I I I I I

--1- LANDINGS LONG TERM

-a-

w

z

I

u

~

Figure 7.26. - Irish Sea West- males (M= 0.2) :

50

0

-50

relative changes in long-term landings and biomass, and short-term landings (i.e. after one year) in response to relative changes in effort

IRISH SEA WEST ( 15)

males (M=0.2)

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

m

n

n

-+- LANDINGS LONG TERM -a- LANDINGS AFTER 1 YEAR

-x-

w

z

:r: u

~

Figure 7.27. - Irish Sea West -males (M= 0.25) :

100

50

0

-50

I

relative changes in long-term landings and biomass, and short-term landings (i.e. after one year) in response to relative changes in effort

IRISH SEA WEST ( 15)

males (M=.25)

--1- LANDINGS LONG TERM

-a-

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

m

v

v

I I I I I I I I I

w

0

z

<(

I

u

~

Figure 7.28. - Irish Sea West- males (M= 0.3) :

100

50

0

-50

;:

relative changes in long-term landings and biomass, and short-term landings (i.e. after one year) in response to relative changes in effort

IRISH SEA WEST (15)

males (M=0.3)

- I - LANDINGS LONG TERM

-a-

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

m

m

n

n

I I I I I I I I I

% CHANGE IN EFFORT

w

z

I

u

~

Figure 7.29. - Irish Sea West- females :

100

50

0

-50

-100

/

relative changes in long-term landings and biomass, and short-term landings (i.e. after one year) in response to relative changes in effort

IRISH SEA WEST ( 15)

females (M=.2)

-+- LANDINGS LONG TERM

--a-

\

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

m ro

m

n

n

I I I I I I I I I

w

z :r:

u

Figure 7.30. - Porcupine Bank- males :

50

0

-50

relative changes in long-term landings and biomass, and short-term landings (i.e. after one year) in response to relative changes in effort

PORCUPINE ( 1 6)

males

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

m ro

w

n

n

I I I I I I I I I

-+- LANDINGS LONG TERM -a- LANDti'IGS AFTER 1 YEAR ...-lf- BIOMASS LONG TERM

w

C)

z

<(

I

u

~-~

Figure 7.31. - Porcupine Bank- females :

50

0

-50

relative changes in long-term landings and biomass, and short-term landings (i.e. after one year) in response to relative changes in effort

PORCUPINE ( 1 6)

females

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

m ro

n

n

I I I I I I I I I

%CHANGE IN EFFORT

LANDINGS LONG TERM

-a-

---*-

w

z

I

u

~

Figure 7.32. - Celtic Sea- males :

50

0

-50

relative changes in long-term landings and biomass, and short-term landings (i.e. after one year) in response to relative changes in effort

CELTIC SEA (20+21 +22)

males

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

m ro

I I I I I I I I I

% CHANGE IN EFFORT

- I - LANDINGS LONG TERM

-e-

---*- BIOMASS LONG TERM

w

z

I

u

~

Figure 7.33. - Celtic Sea- females :

50

0

-50

relative changes in long-term landings and biomass, and short-term landings (i.e. after one year) in response to relative changes in effort

CELTIC SEA (20+21 +22)

females

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

m ro

n

n

I I I I I I I I I

-+- LANDINGS LONG TERM

-s-

w

<..?

z

I

u

~

Figure 7.34. - Bay of Biscay- males :

relative changes in long-term landings and biomass, and short-term landings (i.e. after one year) in response to relative changes in effort

BAY OF BISCAY (23+24)

males

- I - LANDINGS LONG TERM -a- LANDINGS AFTER 1 YEAR -x- BIOMASS LONG TERM

50

0

-50

w

z

I

u

~

Figure 7.35. - Bay of Biscay- females :

100

50

0

-so

relative changes in long-term landings and biomass, and short-term landings (i.e. after one year) in response to relative changes in effort

BAY OF BISCAY (23+24)

females

- I - LANDINGS LONG TERM - 9 - LANDINGS AFTER 1 YEAR

~ BIOMASS LONG TERM

-100~-.-.--.--.--.-.--.--.-.-~---r-o

0 0 0 0 0 0 0 0 0 0 0 0

m ~ ~ ill ll'J '<t t'1 N ~ ~ N

I I I I I I I I I

0 0 0

t'1 '<t l{)

w

z

<(

I

u

~

Figure 7.36. - North Galicia- males :

100

50

0

-50

1 /

/

,/

relative changes in long-term landings and biomass, and short-term landings (i.e. after one year) in response to relative changes in effort

NORTH GALICIA (25)

males

-+--

-a-

\

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

m

n

n v

I I I I I I I I I

w

z

I

u

~

Figure 7.37. - North Galicia - females :

100

50

0

-so

-100

relative changes in long-term landings and biomass, and short-term landings (i.e. after one year) in response to relative changes in effort

~jORTH GALICIA (25)

females

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

m ro

I I I I I I I I I

-+-

-a-

~ BIOMASS LONG TERM

w

z

:r: u

~

Figure 7.38. - West Galicia- males :

100

50

0

-50

-100

relative changes in long-term landings and biomass, and short-term landings (i.e. after one year) in response to relative changes in effort

WEST GALICIA (26)

males

-+-

-a-

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

~ ~ ~

f f T 7

I

Figure 7.39. - West Galicia - females :

C)

w z

100

50

<(

0

:r: u

~

-50

relative changes in long-term landings and biomass, and short-term landings (i.e. after one year) in response to relative changes in effort

WEST GALICIA (26)

females

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

m ro ~ ~ ~ ~ ~ N ~ ~ N ~ v ~

I I I I I I I I I

%CHANGE IN EFFORT

-+-

-a-

w

z

I

u

~

Figure 7.40. - SW and s Portugal- males :

50

0

-50

relative changes in long-term landings and biomass, and short-term landings (i.e. after one year) in response to relative changes in effort

ALENTEJO+ALGARVE (28+29)

males

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

m w

I I I I I I I I I

% CHANGE IN EFFORT

- t - LANDINGS AFTER 1 YEAR

-e-

w

(_')

z

I

u

~

Figure 7.41. - SW and s Portugal - females :

100

50

0

-50

I

relative changes in long-term landings and biomass, and short-term landings (i.e. after one year) in response to relative changes in effort

ALENTEJO+ALGARVE (28+29)

females

---+- LANDINGS LONG TERM

-e-

~ BIOMASS LONG TERM

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

m ro

n

n

I I I I I I I I I

% CHANGE IN EFFORT

Figure 7.42. - Iceland- males :

relative changes in long-term landings in response to relative changes in effort, for various mesh sizes (current mesh : 80 mm)

20

0

t5

z

I

u

~ -40

-60

ICELAND ( 1) - males

LANDINGS LONG TERM

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

~ ~ ~ ~

1 r 7 7 ¹

% CriANGE

EFrORT

-+--

mm

mm

Figure 7.43. - Botney Gut and Silver Pit -males :

relative changes in long-term landings in response to relative changes in effort, for various mesh sizes (current mesh : 70 mm)

w

30

0

~

u

~

-60

0 Ol

I

BOTNEY GUT + SILVER PIT (5)

LANDINGS LONG TERM

0 0

CO 1"- 1 I

0 c:o I

0 0 0

tO

v n

I I I

0 0 0

'!' I

n 0

males

0 v ⁰ tO

---1--

70 mm

mm

mm

w

z

<{

I

u

~

Figure 7.44. - Botney Gut and Silver Pit- females :

relative changes in long-term landings in response to relative changes in effort, for various mesh sizes (current mesh : 70 mm)

BOTNEY GUT + SILVER PIT (5)

LANDINGS LONG TERM

females

0

-50

0 0

m ro

I I

0 0 0

r-... tD l{)

I I I

0 0

.q- I')

I I

0 0 0 0

~ I

0 0 0

" ' I') .q-

0 l{)

-+- 70 mm

-a-

mm

mm

w

z

<{

:r: u

~

Figure 7.45. - Farn Deeps -males :

60

30

0

-30

relative changes in long-term landings in response to relative changes in effort, for various mesh sizes (current mesh : 70 mm)

FARN DEEPS (6) - moles

LANDINGS LONG TERM

-+- 70 mm -e-

mm

mm

1---

J

0 0 0

Ol tO f'-

1 I I

0 0 0 0 0 0 0 0

r f 1 7 7 '

0 0

'<t l()

Figure 7.46. - Farn Deeps -females :

relative changes in long-term landings in response to relative changes in effort, for various mesh sizes (current mesh : 70 mm)

w

z

30

0

;§

u

~

-60

FARN DEEPS (6) - females

LANDINGS LONG TERM

/

I

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

f

r ? 1 7

I

n

-+- 70 mm

mm

~

90mm

Figure 7.47. - Fladen Ground- males :

w

C)

z

30

0

~

u

~

-60

0 en I

0 0

CO r--

1 I

relative changes in long-term landings in response to relative changes in effort, for various mesh sizes (current mesh : 70 mm)

FLADEN GROUND (7) - males

LANDINGS LONG TERM

- 1 -

70 mm -a- 60 mm

~

80mm

=-:.m:~F~~~~;::%!:~~:: __,__

^mm

0 0 0 0 0 0 0 0

tD 1.{")

I I

T 7 ~ I

0 0

N n ⁰

"""

1.{") 0

w

z

:r: u

~

Figure 7.48. - Fladen Ground- females :

relative changes in long-term landings in response to relative changes in effort, for various mesh sizes (current mesh :

mm)

20

0

-20

-40

-60

-80

FLADEN GROUND (7) - females

LANDINGS LONG TERM

-4--- 70 mm

-e-- 60

=--!3---!i:l=:=ij!.--lB---i:!l=~ ~

80

~ 90mm

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

~ ~ ~

r f r 7 7 ,

Figure 7.49. - Firth of Forth- males :

relative changes in long-term landings in response to relative changes in effort, for various mesh sizes (current mesh : 70 mm)

C)

w z

30

0

:2

u

~

-60

0 0 0

Ol CO r--

1 I I

FIRTH OF FORTH (8) - males

LANDINGS LONG TERM

0 0

(J:) I[)

I I ~

I 0

"")

I

0 0 0

~ I

0 0

N l"l 0 0

'<t I[)

--+- 70 mm

-e-

mm

mm

w

0

z

<(

I

u

~

Figure 7.50. - Firth of Forth- females :

relative changes in long-term landings in response to relative changes in effort, for various mesh sizes (current mesh : 70 mm)

0

-50

FIRTH OF FORTH (8) - females

LANDINGS LONG TERM

0 ~ 0

f

f 1

i

7

I

---+- 70 mm -a-

mm

~ 90

mm

Figure 7.5l. - Moray Firth- males (lst run) :

relative changes in long-term landings in response to relative changes in effort, for various mesh sizes (current mesh : 70 mm)

w

z

30

0

i

u

~

-60

MORAY FIRTH (9) - males (M=.3)

LANDINGS LONG TERM

g g

I I I

0 0

U) 1.0

I I

0 0

<t 1"1

I I

0 C'J

I 0

I

0 0 0 0

C'J 1"1 0

<t 1.0 ⁰

- I -

70 mm

mm

- 90mm

w

z

:r: u

~

Figure 7.52. - Moray Firth- males (2nd run) :

relative changes in long-term landings in response to relative changes in effort, for various mesh sizes (current mesh : 70 mm)

30

0

-30

0 Ol

I

MORAY FIRTH (9) - males (M=.2)

LANDINGS LONG TERM

---~--- /I /

'l/ ,,

'/

0 (()

I

0 0 0 0

,...._ ID ll) .q-

1 I I I

0 n I

0 0 0

7 I

-+- 70 mm

-e-

mm

mm

Figure 7.53. - Moray Firth- females (1st run) :

relative changes in long-term landings in response to relative changes in effort, for various mesh sizes (current mesh : 70 mm)

MORAY FIRTH (9)-femoles (imm M=.3-mot M=.2

LANDINGS LONG TERM

w

(.')

z

:r: u

~ 50

0

-so

0 0 0 0 0 0 0 0 0 0

~ ~ ~ r 1 T 7 ^{~ I}

0 0

"' n

0 l{)

70 mm

-a-

mm

mm

w

C)

z

<(

I (_)

~

Figure 7.54. - Moray Firth- females (2nd run) :

relative changes in long-term landings in response to relative changes in effort, for various mesh sizes (current mesh : 70 mm)

MORAY FIRTH (9) - LANDINGS LONG TERM

20

0

-20

-40

-60

-80

0 O'l

I 0 00 I

0

"

females (imm M=.3 mat M=.2 K=.1)

--1-

70 mm

0

\0 I

-a- 80 mm

mm

0 0 0 0 0 0

? T 7 '( I

Figure 7.55. - Moray Firth - females (3rd run) :

relative changes in long-term landings in response to relative changes in effort, for various mesh sizes (current mesh : 70 mm)

G

w z

30

:2

u

~

-60

MORAY FIRTH (9) - LANDINGS LONG TERM

0 Ol

I

0 0

CX) r-.

I I

females (imm M=.2 mat M=.1 K=.06)

0 0 0 0

(() ll") """ I')

I I I I

0 C'l

I 0

I

0 0 0 0 0

C'l I') """ ll")

-+-- 70 mm

-a-

mm

----*-

mm

Figure 7.56. - North Minch -males :

relative changes in long-term landings in response to relative changes in effort, for various mesh sizes (current mesh : 70 mm)

w

z

30

0

]§

u

~

-60

NORTH M INCH ( 11) - males

LANDINGS LONG TERM

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

~ ~ ~ ~

1 T 7

I

-+-- 70 mm

mm

mm

w

z

:r: u

~

Figure 7.57. - North Minch- females :

50

0

-50

0 O'l

I

relative changes in long-term landings in response to relative changes in effort, for various mesh sizes (current mesh : 70 mm)

NORTH M INCH ( 11) - females

LANDINGS LONG TERM

0 0

CO ,..._

I I

0

<D I

0 lO

I

0 0

'<~" n

I I

0 0 0

'I'

I

0 0

N

n

- t - -

70 mm -e-

mm

~

90mm

Figure 7.58. - South Minch- males :

relative changes in long-term landings in response to relative changes in effort, for various mesh sizes (current mesh : 70 mm)

SOUTH M INCH ( 12) - males

LANDINGS LONG TERM

20 -+- 70

0

t5 -20 z

I

u

~

-40

-60

0 0 0

en CO ,..._

I I I

0 0

!.0 l{)

I I

0 0 0 0 0

i 7 I' I

-e-

~ 90mm

w

z

I

u

~

Figure 7.59. - South Minch- females :

relative changes in long-term landings in response to relative changes in effort, for various mesh sizes (current mesh : 70 mm)

50

0

-50

0 Ol

I 0 CO

I

SOUTH MINCH (12) - females

LANDINGS LONG TERM

0 0

1'- <D

I I

0 0 0

If) v t0

I I I

0 ('j

I 0

I

0 0 0

('j t<") 0 v 0 U)

-+-

70 mm

-a- 80 mm

mm

Figure 7.60. - Clyde- males :

relative changes in long-term landings in response to relative changes in effort, for various mesh sizes (current mesh : 70 mm)

20

0

t5

z

I

u

~ -40

-60

0 en I

t

f; I!

I

0 tO

I

"'

CLYDE ( 13) - moles

LANDINGS LONG TERM

0 0

ID 10

I I ~

I 0 n

I 0 N

I 0

I

0 0 0 0

t'l

n

-+--- 70 mm -a-

mm

~

90mm

w

z

:c u

~

Figure 7.61. - Clyde- females :

relative changes in long-term landings in response to relative changes in effort, for various mesh sizes (current mesh : 70 mm)

0

-50

CLYDE ( 13) - females

LANDINGS LONG TERM

0 0 0 0 0 0 0 0 0 0

~ f ~ r ^? r ^{7 7 '}

-+- 70 mm

-a-

mm

mm

Figure 7.62. - Irish Sea East- males :

relative changes in long-term landings in response to relative changes in effort, for various mesh sizes (current mesh : 70 mm)

E. IRISH SEA ( 14) ^- MALES

LANDINGS LONG TERM

40 _{- I -}

70:nm

-a- 75.11.11

--*- 80mm

20

..-sr-

w

C) 0

z

u

~ -20

-40

-60

0 0 0 0 0 0 0 0 0 0 ~ ^{0 0 0 0}

Ol (X) I ' <.0 J')

v

I

^v

I I I I I I I I

Figure 7.63. - Irish Sea East- females :

relative changes in long-term landings in response to relative changes in effort, for various mesh sizes (current mesh : 70 mm)

w

z

I

u

40

20

0

~ -20

-40

0 Ol

I

E. IRISH SEA ( 14) - FEMALES

LANDINGS LONG TERM

g g g

g

I I I I I I I

0 0 0

N 10 0 0

'<!- ll)

-+-- 70mm

-s- 75mm

80mm

85mm

Figure 7.64. - Irish Sea West- males (M= 0.25)

20

0

ts

z

:r: u

~ -40

-60

m 0 I

relative changes in long-term landings in response to relative changes in effort, for various mesh sizes (current mesh : 68 mm)

IRISH SEA WEST ( 15) - males (M=.25)

LANDINGS LONG TERM

0 o:J

I

0 0 0

I ' (0 If')

I I I

0 0

v n

I I

0 ('I

I

0 0

I

0 0

N

n

If')

-+-

-e-

~ 80mm

---v-

Figure 7.65. - Irish Sea West- males (M= 0.3)

relative changes in long-term landings in response to relative changes in effort, for various mesh sizes (current mesh : 68 mm)

w '-' z

30

0

]§ -30 u

~

-60

0 Ol

I

IRISH SE.A WEST (15) - males (M=.3)

LANDINGS LONG TERM

11 k7

1

/;

;J.

/

0 0

CO t--

1 I 0

<.0 I

---+-

-a- 75

- =d~2l:=::!:::~~~~=!~~~----*""-

m m

0 0

l{) "<t

I I

0 0

t0 N

I I

0 0

I

Figure 7.66. - Irish Sea West- females :

relative changes in long-term landings in response to relative changes in effort, for various mesh sizes (current mesh : 68 mm)

w

<.::>

z 30

0

:2

u

~

-60

IRISH SEA WEST ( 15) - females (M=.2)

LANDINGS LONG TERM

-1--- 68

mm

-a- 75 mm

mm

- ,__..lil===:;;:!~a~::t;:.:::~~~~ __,.___

mm

Figure 7.67. - Porcupine Bank- males :

relative changes in long-term landings in response to relative changes in effort, for various mesh sizes (current mesh : 74 mm)

w

z

10

0

-10

<( -20

u

~ -30

-40

-50

PORCUPINE ( 1 6) - moles

LANDINGS LONG TERM

0 0 0 0 0 0 0 0 0

I ~ ~ f 1 t 7 ~ I

0 0 0 0

C'l 10 .q- l[)

-+-

-a-

Figure 7.68. - Porcupine Bank- females :

relative changes in long-term landings in response to relative changes in effort, for various mesh sizes (current mesh : 74 mm)

20

0

w

z

<(

I

u

~ -40

-60

PORCUPINE (16) - females

LANDINGS LONG TERM

--+-

._.j,.-.,-:€!}:::~F-~~:!=~~~=.=:=:J!F=~i::::::2l

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

~ ~ ~

r ¹ r 7

,

Figure 7.69. - Celtic Sea -males :

relative changes in long-term landings in response to relative changes in effort, for various mesh sizes (current mesh : 80 mm)

w

(_')

z

30

0

]§

u

~

-60

CELTIC SEA (20+21 +22) - moles

LANDINGS LONG TERM

--+- 80 mm

-a-

mm

mm

w

z

I

u

~

Figure 7.70. - Celtic Sea- females :

relative changes in long-term landings in response to relative changes in effort, for various mesh sizes (current mesh : 80 mm)

50

0

-50

0 Ol I

C EL Tl C SEA ( 2 0 + 21 + 2 2) - f em a I e s

LANDINGS LONG TERM

0 OJ

I 0 ,....

I 0 tO

I 0 If)

I

0 0 0 0 0

'<f" ")

I I

7 ^I

--+-- 80 mm

-a-

mm

mm

Figure 7.71. - Bay of Biscay -males :

relative changes in long-term landings in response to relative changes in effort, for various mesh sizes (current mesh : 50 mm)

w

C)

z

I

u

20

0

~ -20

-40

BAY OF BISCAY (23+24) - moles

LANDINGS LONG TERM

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

~ f ~ r 1 r 7 ~ 1

---1-

50 mm -e- 55 mm

mm

-X:J- 65

mm

w

z

I

u

~

Figure 7.72. - Bay of Biscay- females :

relative changes in long-term landings in response to relative changes in effort, for various mesh sizes (current mesh : 50 mm)

20

0

-20

-40

-60

-80

0 Ol

I

BAY OF BISCAY (23+24) - females

LANDINGS LONG TERM

-+- 50 mm -a- 55 mm

.m-di'S~~:t~~~ ~ 60 mm

0 0 0 0 0 0

ro ~ m ^{~ ~} ~

I I I I I I

0 N I

0 0

I

0 0

N ~

- ' r - 65

mm

Figure 7.73. - North Galicia -males :

w

z

20

0

~

u

!>{

-40

relative changes in long-term landings in response to relative changes in effort, for various mesh sizes (current mesh : 40 mm)

NORTH GALICIA (25) - moles

LANDINGS LONG TERM

0 0 0 0 0 0 0 0 0 0 0

f f ~ f f t 7 7 I

0 0 0 0

N 1"1 v U)

-+- 40

-a-

- 60mm

~ 65mm

Figure 7.74. - North Galicia- females :

relative changes in long-term landings in response to relative changes in effort, for various mesh sizes (current mesh : 40 mm)

w

z

20

0

~

()

~

-40

NORTH GALICIA (25) - females

LANDINGS LONG TERM

-+- 40

~ 60mm

_:s;;t- 6S m m

Figure 7.75. - West Galicia -males :

relative changes in long-term landings in response to relative changes in effort, for various mesh sizes (current mesh : 40 mm)

20

0

w

z

<(

I

u

~

-40

-60

WEST GALICIA (26) - males

LANDINGS LONG TERM

-+-- 40 mm

-d~~F=:!=:!=E::it~~=;;

^{55 mm}

.,

65

mm

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

~

f 7 r ? r 7 7 ,

Figure 7.76. - West Galicia- females :

40

20

w 0

C)

z

<(

:r: u

~ -20

-40

0 en I

relative changes in long-term landings in response to relative changes in effort, for various mesh sizes (current mesh : 40 mm)

WEST GALICIA (26) - females

LANDINGS LONG TERM

--+- 40

-a-

60

----I---. --. ---

1 ^;7

w I

7

I

0 00 I '/

'

.

0 ,....

I

0 0

lO I()

I I

~

I 0 t")

I 0 N

I 0

I

0 0 0

N 0

...,