Seabird and Shark Bycatches in the Pacific Ocean from Taiwanese Observer Data of 2002-2005 ******** Shui-Kai Chang, Ju-Ping Tai & Chih-Hao Shiao.

Seabird and Shark Bycatches in the Pacific Ocean from Taiwanese Observer Data of 2002-

2005

********

Shui-Kai Chang, Ju-Ping Tai & Chih-Hao

Shiao

Observer Program was launched on Taiwanese LL in the Pacific

Ocean since 2002

-------------------------------

Altogether 13 observation trips during 2002-05

4 on ALB vessels – in temperate region

9 on BET vessels – in tropical region

Year No. Obs No. Vessel Total efforts Fishing days

2002 1 1 186 65

2003 2 3 653 183

2004 2 4 1066 324

2005 4 5 982 308

E 120 140 160 180 160 140 120 100 80 W

40

20

0

20

40N

S

E 120 140 160 180 160 140 120 100 80 W

40

20

0

20

40N

SE 120 140 160 180 160 140 120 100 80 W

40

20

0

20

40N

S

2003

2004 2005

E 120 140 160 180 160 140 120 100 80 W

40

20

0

20

40N

S

2002

> 100 50 - 100 25 - 50 5 - 25 0 - 5

1000 Hooks

> 100 50 - 100 25 - 50 5 - 25 0 - 5

1000 Hooks

> 100 50 - 100 25 - 50 5 - 25 0 - 5

1000 Hooks

> 100 50 - 100 25 - 50 5 - 25 0 - 5

1000 Hooks

Tunas Billfishes Sharks Other fishes Seabirds

Year No. % No. % No. % No. % No. %

2002 2,374 83.36 147 5.16 81 2.84 246 8.64 0 0.00

2003 11,672 87.44 202 1.51 365 2.73 1,094 8.20 15 0.11

2004 12,253 88.11 519 3.73 733 5.20 518 3.72 6 0.04

2005 15,028 82.02 970 5.29 876 4.78 1,438 7.85 9 0.05

ALB

BET

YFT

SWO

BIL

SKJ

OTH

SEABIRDS

Ranged between 0.00-0.11% to the total catches

Seabird

Overall EPO

Year No. Catch rate No. Catch rate

2002 0 0.000 0 0.000

2003 15 0.023 1 0.004

2004 6 0.006 1 0.003

2005 9 0.009 6 0.016

E 120 140 160 180 160 140 120 100 80 W

40

20

0

20

40N

S

E 120 140 160 180 160 140 120 100 80 W

40

20

0

20

40N

SE 120 140 160 180 160 140 120 100 80 W

40

20

0

20

40N

S

2003

2004 2005

>=4 3 2 1

Sea bird

>=4 3 2 1

Sea bird

>=4 3 2 1

Sea bird

Laysan albatross

Black-browed albatross

Amsterdam albatross

Giant petrel

Petrels

Others

For 2004-05 when new observer logbook adopted

Year TotalAlive and released

Dead and discarded

2002 0 0 0

2003 15 1 14

2004 6 1 5

2005 9 1 8

Total 30 3 (10%)　 27 (90%)

Frigitbirds

Albatr-osses

Others

Tropical Region

Others

Petrels

Albatrosses

Temperate Region

N=519

N=2819

SHARKS

Ranged between 2.73-5.20% to the total catches

Shark

Overall EPO

Year No. Catch rate No. Catch rate

2002 81 0.436 42 0.507

2003 365 0.559 267 0.987

2004 733 0.688 391 1.250

2005 876 0.892 285 0.745

E 120 140 160 180 160 140 120 100 80 W

40

20

0

20

40N

S

E 120 140 160 180 160 140 120 100 80 W

40

20

0

20

40N

SE 120 140 160 180 160 140 120 100 80 W

40

20

0

20

40N

S

2003

2004 2005

E 120 140 160 180 160 140 120 100 80 W

40

20

0

20

40N

S

2002

>100 50-100 25-50 10-25 1-10

Shark

>100 50-100 25-50 10-25 1-10

Shark

>100 50-100 25-50 10-25 1-10

Shark

>100 50-100 25-50 10-25 1-10

Shark

Blue shark

Silky shark

Shortfin mako

Oceanic whitetip shark

Pelagic thresher

Bigeye thresher

Other shark

308 fish: 286 (2004-05) + 22 (2006) 80% from blue shark and 10% from silky shark shark-fin-ratio varies significantly by species

and by the way the shark carcasses are processed

100 80W

40

S50

30

N40

30

20

10

0

10

20

E140 160 180 160 140 120

鯊魚還原係數採樣分布2004~2006

> 10

5 to 10

2 to 5 < 2

Brief Introduction to the 2006 Workshop on

Reduction of Sea Turtle Incidental Catch

60 peoples from industry and government

Topics

(1) World actions to conserve sea turtles

(2) The endangered sea turtles

(3) Results from circle hooks experiments

(4) The usage of de-hooker

(5) Invitation for large scale circle hooks experiments

7 Atlantic LL and 3 Pacific LL enrolled