Catch variation of a set net fishing ground in the coastal waters off Neungpo, Goeje Island

J. Kor. Soc. Fish. Tech., 45(4), 211 222, 2009 DOI:10.3796/KSFT.2009.45.4.211

Catch variation of a set net fishing ground in the coastal waters off Neungpo, Goeje Island

Byung Yul C HA *

Aquaculture and Resource Enhancement Division, East Sea Fisheries Research Institute, NFRDI, Gangneung 210-861, Korea

The fisheries resources by a set net in the coastal waters off Neungpo, Goeje Island from 2003 to 2004 were studied to determine species composition and catch variation. The main fishing period by a set net were from April to December in 2003 and from May to December in 2004. A total weight of 48 species caught through the survey period was 540,688.0kg. Most of them were 44 species of fishes and a few were 4 species of cephalopods. Dominant species was Trachurus japonicus accounting to 57.5% in total catch. Sub- dominant species were Trichiurus lepturus(12.9%), Engraulis japonicus(10.6%), Scomber japonicus(6.9%), Clupea pallasii(4.5%), Todarodes pacificus(2.8%) and Parapristipoma trilineaturm (1.3%). The remnant species showed a low catch, indicating the catch had less than 1% in total, respectively. T. japonicus and T.

lepturus were caught throughout the survey period, but C. pallasii, Gadus macro-cephalus, Oncorhynchus keta in low temperature season and Thunnus obesus in high temperature season. The fishing ground temperature was 11.7 24.0 in range and the catch by a set net was higher in autumn than in spring and in summer with the variation of fishing ground temperature. The annual catch by a set net was much higher in 2004 than in 2003 due to high temperature( 17 ) and the recruitment of T. japonicus from offshore seas.

Therefore we concluded that the catch of Neungpo fishing ground by a set net was highly related to the variation of T. japonicus catch with fishing ground temperature.

Key words : Goeje Island, Neungpo, Set net, Trachurus japonicus, Catch variation

* Corresponding author: [email protected], Tel: 82-33-660-8526, Fax: 82-33-661-8514

, . ,

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(Cha et al., 2001, 2004),

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(pelagic fish) .

, Kim et al.(1988)

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, Kim and Rho(1995, 1996)

, Kim et al.(2003)

. Hong and Lee(1995)

, Han et al.(2001)

. , Go and Shin(1988)

, Go and Shin(1990)

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,

.

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(Fig. 1).

,

.

2003 2004 2

. 30m .

( )

(Fish court) 132m, 121mm (Inclined passage) 60m,

76mm .

(Leader) 585m .

27m ,

, .

. ,

10m , CTD (SBE 19 plus V2) 0.1 C . ,

. 98 , 99

100 3 ,

(Large purse seine fishery)

(NFRDI, 2003 2004) .

2003 2004

Fig. 2 . 2003

1 3 11.7 12.1 C

, 4 8

9 24 C . 10

20 C , 12

15 C .

2004 1 5 12.2 14.8 C

6 16 C

, 8 9 10

20 C .

2003 2004

, 2004 2003

1 4 0.5 2 C

, 6 8 2 C

. 2003

18.3 C, 2004 18.0 C 2003 2004

0.3 C .

2003 2004 2

540,688.0kg

48 (Table 1).

Fig. 1. Sampling site for fisheries resources study by a set net in the coastal waters off Neungpo, Goeje Island from 2003 to 2004 (The block numbers within map indicate the fishing ground range by purse seine fishery).

34 50 N

34 40 N

128 30 E 128 45 E KOREA

Jeju Island Study area

100Block

Neungpo

Neungpo fishing ground

99Block

Goeje Island

98Block

Fig. 2. Monthly variation of temperature in the coastal waters off Neungpo, Goeje Island from 2003 to 2004.

30.0

25.0

20.0

15.0

10.0

5.0

Month 2003

2004

J. F. M. A. M. J. K. A. S. O. N. D.

Temperature( C)

Table 1. Species composition and abundance of fisheries resources caught by a set net in the coastal waters off Neungpo, Goeje Island from 2003 to 2004

Species

Acanthopagrus schlegeli Aluterus monocerus Auxis rochei Canthigaster rivulatus Channa argus Clupea pallasii Decapterus macrosoma Engraulis japonicus Gadus macrocephalus Girella punctata Gymnothorax kidako Isurus oxyrinchus Konosirus punctatus Lateolabrax japonicus Liparis tessellatus Loligo chinesis Lophiomus setigerus Mola mola Mugil cephalus Oncorhynchus keta Oplegnathus fasciatus Pagrus major Pampus argenteus Paralichthys olivaceus Parapristipoma trilineaturm Paroctopus dofleini Platycephalus indicus Pleronichthys cornutus Psenopsis anomala Sardinella zunasi Scomber japonicus Scomberomorus niphonius Sebastes schlegeli Semicossyphus reticulatus Sepiolidae

Seriola dumerili Seriola lalandi Seriola quinqueradiata Siganus fuscescens Speia esculenta Sphyraena pinguis Takifugu chinensis Tetraodontiformes Thamnaconus modestus Thunnus obesus Todarodes pacificus Trachurus japonicus Trichiurus lepturus Total catch(kg) Number of species

166,263.4 32

374,424.6 38

540,688.0 48

100.00

+ ; less than 0.1

2003year 2004year Total catch(kg) Ratio(%) Occurrence(%) 1.3

1.2 6,090.2 28,493.5

34.6

348.2 17.9 1,867.7

54.4 946.1

9.9 1,114.7

1.7 2.1 37.5 17.4 841.0 1,155.7

45.3 1,082.7

10.3 88.5

230.3 153.0 93.3 225.8 110.4 38.9 153.2 13,651.9 91,363.0 17,981.7

92.7 2,600.4

80.6 3.5 18,141.4

2,336.2 28,547.4

40.4 108.2 646.4 90.2

159.2 43.2 718.1

80.4 107.9

2.7 68.6

1.5

7,050.6

14.7 191.9 37,116.4

2,466.3 2.7 301.5 376.3 363.4 271.5 66.2

5.3 15.7 17.6 1.5 19.5 1,367.0 219,394.2

51,513.3

1.3 92.7 2,600.4

80.6 4.7 24,231.6

2,336.2 57,040.9

75.0 108.2 646.4 90.2 348.2

17.9 2,026.9

97.6 1,664.2

80.4 107.9

2.7 68.6 11.4 1,114.7

1.7 7,050.6

2.1 37.5 32.1 1,032.9 1,155.7 37,161.7

3,549.0 13.0 390.0 376.3 363.4 501.8 153.0 159.5 5.3 241.5

17.6 111.9

58.4 153.2 15,018.9 310,757.2

69,495.0

0.1 0.5 0.1 4.5 0.5 10.6

0.1 0.1 0.1 0.1 0.1 + 0.4 0.1 0.3 0.1 0.1 + 0.1

+ 0.2

+ 1.3

+ 0.1 0.1 0.2 0.2 6.9 0.7 + 0.1 0.1 0.1 0.1 0.1 0.1 + 0.1

+ 0.1 0.1 0.1 2.8 57.5 12.9

5.6

16.7

5.6

5.6

11.1

27.8

11.1

61.1

27.8

11.1

11.1

5.6

5.6

16.7

38.9

16.7

55.6

5.6

5.6

5.6

16.7

22.2

33.3

5.6

5.6

5.6

11.1

22.2

27.8

16.7

22.2

83.3

16.7

33.3

11.1

16.7

27.8

16.7

27.8

5.6

16.7

11.1

33.3

55.6

5.6

27.8

94.4

83.3

2003 166,263.4kg, 32

, 2004 374,424.6kg

38 , 2004

2003 . ,

(Trachurus japonicus) 310,757.2kg

57.5% .

(Trichiurus lepturus) 69,495.0kg

(12.9%) . (Engraulis

japonicus) 57,040.9kg(10.6%), (Scomber japonicus) 37,161.7kg(6.9%), (Clupea pallasii) 24,231.6kg(4.5%), (Todarodes pacificus) 15,018.9kg(2.8%)

(Parapristipoma trilineaturm) 7,050.6kg(1.3%) ,

1% .

2003 4 5 15,000kg

6 20,000kg (Fig.

3). 7 8 26,000kg, 28,000kg

, 9 10

( )

15,000kg

. , 12 37,000kg

,

, .

2004 1 (10,000kg

) , 2 4

. , 5

6 50,000kg 7

60,000kg . 9

90,000kg , 10

12 15,000kg

. 2003 2004

, .

Fig. 4

. 2003 , 5

6 13,000kg 7

20,000kg . 8

12 10,000kg

. 2004 1

, 5 7

60,000kg 9 70,000kg

. 2003 2004 ,

.

2003 2004

98, 99, 100 Fig. 3. Monthly catch by a set net in the coastal waters off

Neungpo, Goeje Island from 2003 to 2004.

100,000 80,000 60,000 40,000 20,000 0

2003 Month 2004

non fishing non fishing

Catch(kg)

J. F. M.A.M. J. J. A. S. O. N.D. J. F.M.A.M.J. J. A. S. O. N.D.

Fig. 4. Monthly variation of Trachurus japonicus catch by a set net in the coastal waters off Neungpo, Goeje Island from 2003 to 2004.

80,000 70,000 60,000 50,000 40,000 30,000 20,000 10,000 0

2003 Month 2004

Trachurus japonicus

Catch(kg)

J. F. M.A.M. J. J. A. S. O. N.D. J. F.M.A.M.J. J. A. S. O. N.D.

Fig. 5 .

,

.

, 2003 1 4 10

, 6 10 1

. 2003 12

130 , 2004 1

60 . 2004

4

9 300 , 12

400 .

Fig. 6 . , 2003

( , y 0.8399x

9943.4, r

0.3211). , 2004

(

, y 0.9559x 18298, r

0.8105).

,

. ,

2003 2004 ,

.

17 C

, 17 C

Fig. 7 .

17 C

( , y 0.0012x 2006.4,

r

0.0009). 400

1 . ,

17 C

( , y 0.1796x

18923, r

0.7486).

10

30 .

, 17 C

, (Table 2),

2003 82 2004 202 .

Fig. 5. Monthly catch of Trachurus japonicus caught by purse seine in offshore fishing ground (98, 99, 100 block) off Neungpo, Goeje Island from 2003 to 2004. The plus sign within figure is less than 1 ton.

Fig. 6. Relations between monthly catch and Trachurus japonicus catch by a set net in the coastal waters off Neungpo, Goeje Island, 2003 and 2004.

500 400 300 200 100 0

Catch(tons) at offshore

2003 Month 2004

J. F. M. A.M. J. J. A. S. O. N. D. J. F. M.A. M. J. J. A. S. O. N. D

Trachurus japonicus 100,000

80,000 60,000 40,000 20,000

0 0 20,000 40,000 60,000 80,000

Trachurus japonicus catch(kg) 2003

2004

y=0.9559x 18298 r

=0.8105

y=0.8399x 9943.4 r

=0.3211

Catch(kg)

(98, 99, 100 )

2003 2 , 2004

525 .

2004 2003 2.5

2004 2003

260 . (17 C

) 2003 6 11 6

, 2004 7 10 4 .

, .

, , , ,

, ,

.

(Scomberomorus niphonius),

(Gadus macrocephalus), (Liparis tessellatus), (Lophiomus setigerus), (Oncorhynchus keta), (Thamnaconus modestus) (Thunnus obesus)

. (Girella punctata), (Loligo chinesis), (Seriola dumerili),

(Siganus fuscescens)

(Decapterus macrosoma) ,

.

310,757.2kg(57.5%) .

42.4%(Go and Shin, 1988), 35.4%(Go and Shin, 1990), 69.2%(Kim et al., 1999), 32.4%(Cha et al., 2001), 70.2%(Cha et al., 2001), 0.1%(Cha et al., 2001), 34.6%

(Cha et al., 2004), 22.2%(Cha et al., 2008) 0.5 75.6%(Kim, 1993;

Kim et al., 1988, 1989; Kim and Rho, 1995, 1996) 12.2%(Hong and Lee, 1995)

.

.

,

.

, 10 C

. ,

Fig. 7. Monthly catch relations between at Neungpo fishing ground and at offshore fishing ground by Trachurus japonicus from 2003 to 2004.

Table 2. Comparison of Trachurus japonicus catch during high temperature( 17 C) period in 2003 year and 2004 year

80,000 70,000 60,000 50,000 40,000 30,000 20,000 10,000 0

0 50 100 150 200 250 300 350 400 450 500 Catch(tons) at offshore

Catch(kg) at set net ^{17 C}

17 C

transition temperature(17.0 C) Trachurus japonicus

Item Year

High temperature

month

T.japonicus catch at set net

T.japonicus catch at offshore 2003(A)

2004(B) Co-comparison

Index(B/A)

June-November (6 months) July-October

(4 months) 0.7

82 tons 202 tons

2.5

2 tons

525 tons

262.5

,

, 2003 2004

5 6

2004 9 , 70,000kg

.

2003 166,263.4kg 2004 374,424.6kg

. 2004

, , , ,

,

2004 2003 9 10

, 2004 2003

. ,

(98, 99, 100 )

(NFRDI, 2003 2004), 2003

303 2004 1,183 2004

2003 4 . 2004

9 12

300 , 400

.

,

. 2004

,

2004

.

20 30

. Cha et. al.(2001) ,

1999 10 45,000kg ,

.

.

,

. ,

. , 17 C

, 17 C

. 430

1 .

.

,

. 17

C

,

. , 17 C

,

2003 82 , 2004 202 2004

2003 2.5 .

2003 2 , 2004

525 2004 2003 260

. (17 C ) 2003

6 11 6 , 2004

7 10 4 .

2004 2003 2

2004 2003

.

2004 2003

.

,

.

.

.

, , ,

, ,

.

2003

2004 2

540,688.0kg 48

. 310,757.2kg

57.5% .

(12.9%), (10.6%), (6.9%),

(4.5%), (2.8%)

(1.3%) ,

. , ,

, , , ,

.

2003 166,263.4kg

2004 374,424.6kg , 2003

32 , 2004 38 2004

2003 .

2004 2003 , ,

, , ,

,

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.

( , RP

2009 RE 015) ,

.

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Ichthyol., 2(1), 36 46.

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Ichthyol., 14(1), 61 69.

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Bull. Kor. Soc. Fish. Tech., 31(2), 153 165.

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Ichthyol., 18(3), 223 233.

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Fish. Tech., 31(1), 15 23.

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Fish. Tech., 32(2), 125 131.

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369.

2009 8 6

2009 9 28 1

2009 10 25 2

2009 10 27

Appendix 1. Species composition and abundance of fisheries resources caught by a set net in the coastal waters off Neungpo, Goeje Island, 2003

Species

Acanthopagrus schlegeli Channa argus Clupea pallasii Engrdaulis japonicus Gadus macrocephalus Konosirus punctatus Lateolabrax japonicus Liparis tessellatus Loligo chinesis Lophiomus setigerus Pagrus major Pampus argenteus Paralichthys olivaceus Paroctopus dofleini Platycephalus indicus Pleronichthys cornutus Psenopsis anomala Sardinella zunasi Scomber japonicus Scomberomorus niphonius Sebastes schlegeli Semicossyphus reticulatus Seriola lalandi Seriola quinqueradiata Siganus fuscescens Sphyraena pinguis Tetraodontiformes Thamnaconus modestus Thunnus obesus Todarodes pacificus Trachurus japonicus Trichiurus lepturus Total catch(kg) Number of species

Apr. May Jun. Jul. Aug. Sep. Oct. Nov. Dec. Total

3,165.7

348.2 13.2

162.3 1.3

540.7

6.1

107.3

11.0 10.5

296.5

2,475.3

55.1 3.2 3.8

539.6

494.5 4.2

118.7

35.2 13.2

9,875.2 225.3

1,440.8

5.2

45.3 355.6

4.3

37.7 2.8

3,480.2 13,945.1

15.2 1.3

1,320.7

36.4

2.2

1.6 1.5

21,360.1 3,555.2

982.3

1.1

81.6

136.5

153.2

16,740.4 10,170.3

1.2

90.9

795.2

24.4

12.7

9,750.4 1,090.2

78.5 3.6 2.2

45.8 75.4

58.1

30.2

3.8

75.2

7,785.7 1,080.3

135.6 13.1

3.3 1,116.3

50.8 179.3

5.4 27.2

1.7

4.3

50.6

54.1

93.3 150.6

24.9 1.4

12,630.7 750.4

6,090.2 19,955.4

21.5

1.4 672.9

547.2

5.3

2.1

13.1

15.7

4.2

9.5

8,925.3 1,320.1

1.3 1.2 6,090.2 28,493.5

34.6 348.2 17.9 1,867.7

54.4 946.1 9.9 1,114.7

1.7 2.1 37.5 17.4 841.0 1,155.7

45.3 1,082.7

10.3 88.5 230.3 153.0 93.3 225.8 110.4 38.9 153.2 13,651.9 91,363.0 17,981.7 4,662.8

11

13,843.3 12

19,332.2 10

26,279.0 8

28,265.4 7

11,765.0 7

9,238.8 11

15,293.0 18

37,583.9 14

166,263.4

32

Appendix 2. Species composition and abundance of fisheries resources caught by a set net in the coastal waters off Neungpo, Goeje Island, 2004

Species Aluterus monocerus Auxis rochei Canthigaster rivulatus Channa argus Clupea pallasii Decapterus macrosoma Engrdaulis japonicus Gadus macrocephalus Girella punctata Gymnothorax kidako Isurus oxyrinchus Liparis tessellatus Loligo chinesis Lophiomus setigerus Mola mola Mugil cephalus Oncorhynchus keta Oplegnathus fasciatus Pagrus major

Parapristipoma trilineaturm Pleronichthys cornutus Psenopsis anomala Scomber japonicus Scomberomorus niphonius Sebastes schlegeli Semicossyphus reticulatus Sepiolidae

Seriola dumerili Seriola lalandi Siganus fuscescens Speia esculenta Sphyraena pinguis Takifugu chinensis Tetraodontiformes Thamnaconus modestus Todarodes pacificus Trachurus japonicus Trichiurus lepturus Total catch(kg) Number of species

Apr. May Jun. Jul. Aug. Sep. Oct. Nov. Dec. Total

6,300.2

945.6 3.1

55.2

448.2

10.2

23.2 326.1

4.2

120.3 180.2

2,000.6

7,530.3

83.4

103.7 2.7

50.2

262.2 10.4 5.3

10.1

10.6 575.3 1,970.4

8,095.4 270.6 19,085.9

90.2

5.1

1.4

112.5

9.3 32.3

7.5

1.2 791.7 15,110.6

3,210.4

2,065.6 945.3

21.4

58,435.6 45.3

40.3

1.5

90.6

18.7

260.5

2.1

29,940.2 1,500.5

57.8

3.5

40.9 16,675.1

879.2

96.4

71,160.3 1,315.6

28.5

16.3 43.2

2.7 34.2

60.4 20,410.6

985.6

150.6

6.5

15.7

42,075.8 11,720.4

6.4 2,600.4

80.6

2.0 20.4 151.5

77.5

3.1 80.4

33.0

7,050.6

30.7 143.3

127.7

40.5 22,715.3

1,745.2

35.3 87.8 494.9

10.2

178.3

107.9

4.5

223.3

1.5 3.5

540.5 10,825.6

92.7 2,600.4

80.6 3.5 18,141.4

2,336.2 28,547.4

40.4 108.2 646.4 90.2 159.2

43.2 718.1

80.4 107.9

2.7 68.6

1.5 7,050.6

14.7 191.9 37,116.4

2,466.3 2.7 301.5 376.3 363.4 271.5 66.2

5.3 15.7 17.6 1.5 19.5 1,367.0 219,394.2

51,513.3 8,416.5

11

12,615.2 13

46,824.1 14

61,513.2 5

31,854.4 8

90,228.8 8

75,550.5 13

33,163.4 16

14,258.5 13

374,424.6

38