RANÔNG

15

KURABURI

TAKUAPA

THAILAND

TRANG

SATUL

LHOKSEUMAWE

KUALA KEDAH

PENANG

PANGKOR MALAYSIA

SELANGOR

NEGERISEMBILAN

SIBOLGA

MALACCA

JOHOR

PARIAMA N

PADANG

Figure 1. Map of the Malacca Straits and the sampling locations

Figure 2. The production of mackerels, by country.

16

MALAYSIA

THAILAND

INDONESIA

Year

Thoiland (West)P.Malaysia (West)

Sumatra (East)

R brachysoma

R . kanagurto

YearFigure 3a. The production of R. brachysoma and R. kanagurta, by country.

DECAPTERUS Spp

INDONESIA(Sumatra)

THAILAND

MAL AYS IA

Year

Figure 3b. The production of Decapterus spp., by country

17

Figure 4. Mean catch rates of R. brachysoma, January-April 1985.

BAY OF BENGAL

JANUARY

GULFOF

THAILAND

BAY OF BENGAL

FEBRUARY

GULFOF

THAILAND

BAY OF BENGAL BAY OFBENGAL

MARCH

GULFOF

THAILAND

APRIL

GULFOF

THAI LAND

RASTRELLIGER BRACHYSOMA

18

Mean catch rates of Ft. brachysoma, May-August 1985.

BAY OF BENGALGULFOF

BAY OF BENGAL

MAY

THAILAND

JUNE

GULFOF

THAILAND

BAY OF BENGALBAY OFBENGAL

J U LY

G U LFOF

THAIL AND

AUGUST

GULFOF

THAI LAND

RASTRELLIGER BRACHYSOM.A

19

Figure 6. Mean catch rates of R - brachysoma, September-December 1985.

BAY OF BENGALGULF

OF

BAY OF BENGAL

THAILAND

SEPTEMBER OCTOBER

GULFOF

THAI LAND

BAY OF BENGALBAY OFBENGAL

GULFOF

THAILAND

NOVEMBER DECEMBER

GULFOF

THAI LAND

RASTRELLIGER BRACHYSOMA

20

Figure 7. Mean catch rates of Ft. kanagurta, January-April 1985.

BAY OF BENGALGULF

OF

BAY OF BENGAL

JANUARY

THAI LAND

FEBRUARY

GULFOF

THAILAND

BAY OF BENGALBAY OFBENGAL

GULFOF

THAILAND

MARCH APRIL

GULFOF

THAILAND

RASTRELLIGER KANAGURTA

21

Figure 8. Mean catch rates of A. kanagurta, May-August 1985.

22

CAY OF BENGALGULF

OFTHAILAND

BAY OF BENGAL

MAY JUNE

GULFOF

THAILAND

BAY OF BENGAL

GULFOF

BAY OFBENGAL

JULY

THAILAND

AUGUST

GULFOF

THAILAND

RASTRELLIGER KANAGURTA

Figure 9. Mean catch rates of R. kanagurta, September-December 1985.

BAY OF BENGALGULF

OF

BAY OF BENGAL

HAIL AND

SEPTEMBER OCTOBER

GULFOF

THA ILAND

BAY OF BENGALBAYBENGAL

NOVEMBER

GULFOF

THAILAND

DECEMBER

GULFOF

THAILAND

RASTRELLIGER KANAGURTA

23

Figure 10. Mean catch rates of Decapterus spp., January-April 1985.

BAY OF BENGALGULF

OF

BAY OF BENGAL

JANUARY

THAILAND

FEBRUARY

GULFOF

THAILAND

BAY OF BENGAL BAY OFBENGAL

MARCH

GULF”OF

THAILAND

A PRIL

GULFOF

THAILAND

DECAPTERUS SPP

24

Figure 11. Mean catch rates of Decapterus spp., May-August 1985.

25

BAY OF BENGALGULF

OF

BAY OF BENGAL

MAY

THAI LAND

JUNE

GULFOF

THAILAND

BAY OF BENGAL

GULFOF

BAY OFBENGAL

JULY

THAILAND

AUGUST

GULFOF

THAILAND

DECAPTERUS SPP

Figure 12. Mean catch rates of Decapterus Spp September December l985

26

BAY OF BENGALGULFOF

BAY OF BENGAL

SEPTEMBER

THAI LAND

OCTOBER

GU L FOF

THAI LAND

BAY OF BENGAL

GULFOF

BAY OFBENGAL

NOVEMBER

THAILAND

DECEMBER

GUL FOF

THAI LAND

DECAPTERUS SPP

JAN

FEB

MAR

APR

MAY

JUN

JUL

AUG

SEP

OCT

NOV

DEC

Figure 13. Restructured frequencies and growth curves (ELEFAN / analysis) for R. kanagurtaon the west coast of Thailand (Areas l, ll & lll combined).

27

JAN

FEB

MAR

APR

MAY

JUN

JUL

AUG

SEP

OCT

NOV

DEC

28

Figure 14. Restructured frequencies and growth curves (ELEFAN / analysis) for A. brachysomaon the west coast of Thailand (Areas ll and Ill combined).

29

Mergui areaRecruitment Feb 8 May

16cmCATCH RATE, GONADMATURITY AND SIZE

FREQUENCY

THAILAND Q

Tagging Result

RANONG

Rastrelliger brachysomo

GULF

OFTHAILAND

Bayof

B engal

KRABI

PEN ANG

jMALAYSIA

Figure 15, Hypothetical migratory pattern for R. brachysoma.

30

CATCH RATE, GONADMATURITY AND SIZEFREQUENCY (THAILANO

RANONG

Rastrelliger konagurta

GULFOF

THAILAND

Bayof

B engal

KRABI

PENANG

MALAYSIA

ASAHAN

Figure 16. Hypothetical migratory pattern for R. kanagurta.