Species Composition and Distribution of Set-net Catches on the Coast of Dapo, Geoje Island

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Kor J Fish Aquat Sci 47(6),997-1005,2014

한수지 47(6), 997-1005, 2014

Original Article

997 Copyright © 2014 The Korean Society of Fisheries and Aquatic Science pISSN:0374-8111, eISSN:2287-8815

서 론

거제도는육지로부터많은영양염이흘러나와기초생산력이 높기때문에다양한어류의서식처로서좋은환경적조건을갖

추고있다

(Cha, 1999).

또한조사지역인다포연안은쿠로시오

해류의지류인대마난류수가제주도동부해역을통해우리나 라남해안으로유입되어동해로빠져나가는길목에위치하고 있어

(Bae and Kim, 2012),

^난류성^어류인^전갱이

,

^멸치

,

^고등 어

,

^갈치^등이^빈번히^출현하는^곳이다

.

^이들^난류성^어종^중 에서전갱이와멸치는동중국해에서산란을일찍시작하여

,

대 마난류수를따라산란된개체들이우리나라연안까지수송된 다

(Hwang et al., 2006b; Sassa et al., 2006).

^수온이^상승하면 우리나라연안으로접안회유하면서산란이일어나기때문에 동해와서해에비하여남해는동중국해기원의산란개체와연 안산란개체가가장혼잡하게섞여있다

(Choo and Kim, 1998;

Kanaji et al., 2009).

^이렇게^여러^개의^{산란집단으로}^이뤄진^어 류개체군의구조적인특성과변동기작을보다잘이해하기위 하여어류의연안가입

,

^분포

,

^회유

,

^산란^등과^같은^생태학적^연 구는더욱필요하다

.

정치망어업은육지가까이수심

10-40 m

의얕은지역에고정

부설하여연안으로내유하는어군을대상으로다소소극적으로 어획하는어법으로

,

^지형적^해황^특성의^영향을^크게^받는다

.

^하 지만어장주변의지형과어군의행동을잘파악하여일정지역 에길그물을설치하면정착성및회유성어종에대한채집효율 을높일수있다는이점이있다

(Kim et al., 2009).

최근에는지 구온난화로인한해수온상승이수산자원의서식범위에영향 을주고있어

,

^정치망^어획물의^종조성과^변동^특성에^대한^연구 는기후변동에대응하기위한자원관리방안을마련하는데근거 자료로활용되고있다

(Cha, 2009a).

지금까지우리나라에서보고된정치망에의한어획물조사를

거제도 다포 연안 정치망 어획물의 종조성 및 주요 어종의 분포 특성

정경미·이동진·강수경*·최광호

국립수산과학원 자원관리과

Species Composition and Distribution of Set-net Catches on the Coast of Dapo, Geoje Island

Kyung-Mi Jung, Dong Jin Lee, Sukyung Kang* and Kwang Ho Choi

Fisheries Resources Management Division, National Fisheries Research and Development Institute, Busan 619-705, Korea We analyzed annual and seasonal variations in fish species composition and distribution patterns using both daily catch and quantitative analysis data collected from a set-net fishery over a period of two years (2011-2012) on the coast of Dapo, Geoje Island. Set-net fishing season in this area is from May to November, and the annual yield based on the daily catch data was 171,412 kg in 2011, and 102,611 kg in 2012. In total, there were 46 species (belonging to 36 families and 12 orders) in 2011, and 41 species (belonging to 25 families and 9 orders) in 2012. The dominant species in terms of numbers were Trachurus japonicus , Engraulis japonicus , Clupea pallasii , Scomber japonicus , and Sphyraena pinguis . The range in fork length for T. japonicus and E. japonicus was from 3.2 to 23.9 cm, and from 2.6 to 13.3 cm, respectively. The fork length of recruiting juveniles to the Dapo set-net fishing ground ranged from 4.6 to 7.8 cm (median) for T. japonicus , and from 4.1 to 5.0 cm (median) for E. japonicus . The fact that most of the fish caught from the two species were at immature growth stages implies that the coast of Dapo can act as a nursery area for these migratory species.

Key words: Set net fishery, Species composition, Distribution, Trachurus japonicus , Engraulis japonicus

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial Licens (http://creativecommons.org/licenses/by-nc/3.0/)which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

http://dx.doi.org/10.5657/KFAS.2014.0997 Kor J Fish Aquat Sci 47(6) 997-1005, December 2014

Received 13 October 2014; Revised 18 November 2014; Accepted 28 November 2014

*Corresponding author: Tel: +82. 51. 720. 2287 Fax: +82. 51. 720. 2277

E-mail address: [email protected]

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살펴보면

,

^어획물의^종조성과^{계절변동과}^관련해서

Ryu et al.

(2005)

의동해중부연안

, Han et al. (2002)

의울산연안

, Kim et al. (2003)

^과

Hwang et al. (2006a)

^의^여수^연안

, Go and Shin

(1990)

의제주화순연안등에서수행된연구결과가있다

.

정

치망어획물의변동요인과관련해서는주로수온과의상관관 계

(Cha et al., 2001; Cha et al., 2008; Cha, 2009a)

^를^분석하 였고

,

이외에제주연안에서는조석

(Kim et al., 2009),

염분

,

해수유동

,

^월령

,

^풍속

(Kim et al., 1999)

^등의^영향을^살펴보았 고

,

남해에서는풍향

(Lee, 2012),

태풍

,

해파리출현빈도

(Kim et al, 2013)

^등을^고려하여^어획량의^변동^특성을^{연구하였다}

.

거제도에서는능포지역정치망어획물의종조성과전갱이의 어획량과수온과의상관관계를밝힌결과만이존재한다

(Cha, 2009b).

^따라서

,

^본^연구는^거제도^남부^연안에^위치하는^다포 지역의정치망어업에의한어획물의종조성과주요상업어종 의분포특성을파악하여대마난류생태계의수산자원변동을 예측하는데기초자료로제공하고자한다

.

재료 및 방법

본연구는

2011-2012

^년^동안^거제도^다포^연안

(Fig. 1)

^에서^정 치망어기인

5

^월부터

11

^월까지^어획된^{일일어획자료와}^매월

1

회에걸쳐분석한정량자료를이용하였다

.

^{일일어획자료는}^어

획일

,

^총^어획량

,

^주요^{상업어종의}^일일^어획량^등이^기록되었 고

,

이를바탕으로일일총어획량

,

월간조업일수로나눈월별 조업일당어획량

,

^월별^어종별^{어획비율을}^구하였다

.

^정량분석 자료는출현종

,

개체수

,

체장

,

체중등을포함하였고

,

총어획량 은같은날기록된일일어획자료의총량을기준으로하여환산 되었다

.

^{연구해역에서}^이용한^정치망은^{중형정치망}

(

^소대망

) 2

통으로써수심

17-23 m

부근에

24

시간동안설치하였다

.

어구 의규격은길이

254 m,

^폭

30 m,

^길그물^망목

240×240 mm,

^헛 통망목

25×50 mm,

자루그물망목

5×5 mm

이었다

.

주요어종의미성어어획비율을알기위하여

,

^전갱이는

50%

성숙체장인가랑이체장

26.6 cm (Cha et al., 2009),

^멸치는^가 랑이체장

9 cm (NFRDI, 2013)

미만의모든개체를미성어로 간주하였다

.

^어획물의^월별^{종다양도지수}

(H΄)

^는

Shannon and Wiener (1963)

를따랐다

.

출현시기별가랑이체장의변화는

SPSSWIN 12.0

^{프로그램에서}

Scheffé’s multiple comparison test

^의^{사후검정에}^의해^{동일집단군으로}^나누었다

.

^연도별^체장 차이는

Student’s t-test

를이용하여

P<0.05

수준에서유의성을 검증하였다

.

결 과

어획량 변동

거제도다포연안의정치망어업은

5

^월에^어기가^시작되어

11

월에끝났으며

,

일일조사를통해생산된연간총어획량은

2011

년도에

171

^톤

, 2012

^년도에는

103

^톤이었다

.

^연도별^최고^일일 어획량은

2011

^년도에는

6

^월

12

^일의

8.7

^톤이었고

2012

^년도에 는

8

월

25

일의

4.3

톤이었다

(Fig. 2).

2011

^년의^월별^{조업일수는}

6, 7, 8, 10

^월에

29-30

^일로^많았고

나머지조업이있었던달에서는

10-23

일로적었다

. 2012

년도

의조업일수는

5

^월에

16

^일로^가장^적었다가

6

^월에

28

^일로^급 증하나이후부터꾸준히감소하여

11

^월에

18

^일을^{조업하였다}

. 2011

년도의조업일당어획량은

6

월에

2

톤으로가장높았고

11

월에

0.2

^톤으로^가장^낮았다

. 2012

^년도의^조업일당^어획량은

0.4

톤을기록한

5

월부터지속적으로증가하여

9

월에

1.2

톤까지 높아지나이후부터감소하여

11

^월에

0.3

^톤을^{기록하였다}

.

^연도 별평균조업일당어획량은

2011

^년도에

0.9

^톤

, 2012

^년도에

0.6

Fig. 1. Sampling site (black star) in the coast of Dapo, Geoje Is-

land.

35°00'

34°30'

127°30' 128°00'

Dolsan Is.

Yeosu Namhae

Geoje Is.

Dapo★ Neungpo

128°30'

0 20 50 70 100

Trachurus japonicus Engraulis

japonicus Clupea

pallasii Scomber

japonicus Sphyraena pinguis Others

20112012

Species

Proportion (%)

67.8

18.7 27.4 74.1

2.7 0.2 0.9 6.4

0.1 0.4 0.1 0.2

May June July Aug.

Month

Sep. Oct. Nov.

0 10 20 30

Number of species

A

Dapo (2011) Dapo (2012)

0.0 0.3 0.6 0.9 1.5 1.2

Diversity (H')

B

A

Body weight (g)

Trachurus japonicus BW = 0.0088 x FL^3.144

R² = 0.98

0 0 10

Dapo (2011) Dapo (2012)

20 30

60 120 180 240

B

Body weight (g)

Fork lengthe (cm)

Engraulis japonicus

BW = 0.0037 x FL^3.212 R² = 0.93

0 0 5 10 15

5 10 15 20

Fig. 2. Daily total catch (kg) from May to November caught during 2011 and 2012 set net fishery in Dapo.

10,000 8,000 6,000 4,000 2,000 0

Day

Total catch (kg)

Dapo (2011) Dapo (2012)

5/1 5/16 5/31 6/15 6/30 7/15 7/30 8/14 8/29 9/13 9/28 10/1310/28 11/12 11/27

May June July Aug.

Month

Sep. Oct. Nov.

0 8 24

32 3,600

Operating days (2011) Operating days (2012) Catch/day (2011) Catch/day (2012) 2,400

1,200

0 16

Operating days Catch per day (kg)

May 100

75 50 25

0 2011

June July Aug.

Month

Frequency (%)

Sep. Oct. Nov. May

Others species Engraulis japonicus Trachurus japonicus

2012

June July Aug. Sep. Oct. Nov.

May 100

80 75 40 20

0 2011

June July Aug.

Cumulative frequency (%)

Sep. Oct. Nov. May

Mature immature

2012

27

18

9

0

6,000

4,000

2,000

May 0 2011

June July Aug.

Month

Fork length (cm) Catch (kg)

Sep. Oct. Nov. May 2012

b a

c

cd d c e

a a

a

bc c

ab

15 12 9 6 3 0

5,000 4,000 3,000 2,000 1,000

May 0 2011

June July Aug.

Month

Fork length (cm) Catch (kg)

bc cd

ab d

ab

e a

b

b a

c e

b d

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다포 정치망 어획물의 종조성 및 분포 특성

999

톤이었다

(Fig. 3).

월별어종별어획률을살펴보면

,

전갱이는

6-8

월에

,

멸치는

5

월에어획률이가장높은어종으로나타났다

.

^전갱이와^멸치를 합한어획량은

5-6

월에전체어획량의

90-97% (2011

년

), 76- 98% (2012

^년

)

^로 ^높은^어획률을 ^보였고

, 2011

^년도의

10

^월과

2012

^년도의

11

^월을^제외하면^나머지^달에서도^이^두^어종의^어

획률은

50%

이상이었다

(Fig. 4).

어획물 종조성

매월

1

회에걸쳐수거한어획물을정량분석한결과

, 2011

년도 에출현한종은총

12

^목

36

^과

46

^종이었고

, 2012

^년도에는^다소 감소하여총

9

^목

25

^과

41

^종이었다

.

^두^해의^조사기간^동안^농

어목이총

20-23

종으로가장다양하게 출현하였고

,

다음으로

청어목이총

5-6

^종

,

^{쏨뱅이목이}^총

1-4

^종

,

^{살오징어목이}^총

3-4

종

,

복어목어류가총

3

종

,

나머지에서는

1-2

종만이출현하였다

(Table 1). 2011

^년도^다포^연안^정치망^어업의^주요^어종은^전 갱이였으며

,

^연중^전체^{출현개체수의}

67.8%

^를^{차지하였다}

.

^다

음으로멸치가

28.4%,

^청어가

2.7%,

^고등어가

0.9%,

^꼬치고기 가

0.1%,

나머지출현종은 모두합하여

0.1%

이었다

. 2012

년

도에는멸치가

74.1%

^를^{차지하면서}^최다^{출현하였고}

,

^다음으

로전갱이가

18.7%,

고등어가

6.4%,

꼬치고기가

0.4%,

청어가

0.2%,

^나머지는^모두^합하여

0.2%

^이었다

(Fig. 5).

월별출현종수를살펴보면

,

^먼저

2011

^년도의

11

^월은^다른^달 에서나타나지않았던삼치

,

베도라치류

,

풀미역치등을포함하

여총

25

^종이^채집되어^연중^출현한^종수가^가장^많았고

, 5-10

월에는

6-17

종의범위로적게나타났다

. 2012

년도에는

7, 8, 11

월에망둑어류

,

^{반딧불게르치}

,

^{세동가리돔}

,

^청어

,

^인상어

,

^방어

,

꼬치고기등이다양하게채집되면서

16-17

^종으로^가장^출현종 수가많았고

, 5, 6, 9, 10

월에는

4-9

종으로매우낮았다

(Fig. 6a).

개체수를 이용한 종다양도지수는 우점종인 전갱이와 멸치 의출현개체수가상대적으로적고다양한종이출현했던시기 인

2011

^년도의

7, 8, 9, 10

^월

(0.85-1.15)

^과

2012

^년도의

5, 7, 8, 11

^월

(0.84-0.96)

^에^가장^높았다

.

^연도별^평균^{종다양도지수는}

2011

년도에

0.62, 2012

년도에는

0.64

로두해모두비슷하였

Fig. 3. Monthly variations of the total number of operating days (solid line) and catch per day (kg) (dotted line) for 2011 and 2012 set net fishery in Dapo.

10,000 8,000 6,000 4,000 2,000 0

Day

Total catch (kg)

Dapo (2011) Dapo (2012)

5/1 5/16 5/31 6/15 6/30 7/15 7/30 8/14 8/29 9/13 9/28 10/1310/28 11/12 11/27

May June July Aug.

Month

Sep. Oct. Nov.

0 8 24

32 3,600

1,200

0 16

Operating days Catch per day (kg)

May 100

75 50 25

0

2011 June July Aug.

Month

Frequency (%)

Sep. Oct. Nov. May

2012 June July Aug. Sep. Oct. Nov.

May 100

80 75 40 20

0 2011

June July Aug.

Month

Cumulative frequency (%)

Sep. Oct. Nov. May

Mature immature

2012

27

18

9

0

6,000

4,000

2,000

May 0 2011

June July Aug.

Month

Fork length (cm) Catch (kg)

b a

c

cd d c e

a a

a

bc c

ab

15 12 9 6 3 0

5,000 4,000 3,000 2,000 1,000

May 0 2011

June July Aug.

Month

Fork length (cm) Catch (kg)

bc cd

ab d

ab

e a

b

b a

c e

b d

Fig. 4. Monthly changes in percent composition of catches for main species (Trachurus japonicus and Engraulis japonicus) and other species caught during 2011 and 2012 set net fishery in Dapo.

10,000 8,000 6,000 4,000 2,000 0

Day

Total catch (kg)

Dapo (2011) Dapo (2012)

5/1 5/16 5/31 6/15 6/30 7/15 7/30 8/14 8/29 9/13 9/28 10/1310/28 11/12 11/27

May June July Aug.

Month

Sep. Oct. Nov.

0 8 24

32 3,600

1,200

0 16

Operating days Catch per day (kg)

May 100

75 50 25

0 2011

June July Aug.

Month

Frequency (%)

Sep. Oct. Nov. May

2012

May 100

80 75 40 20

0 2011

June July Aug.

Month

Cumulative frequency (%)

Sep. Oct. Nov. May

Mature immature

2012

27

18

9

0

6,000

4,000

2,000

May 0 2011

June July Aug.

Month

Fork length (cm) Catch (kg)

b a

c

cd d c e

a a

a

bc c

ab

15 12 9 6 3 0

5,000 4,000 3,000 2,000 1,000

0 May

2011 June July Aug.

Month

Fork length (cm) Catch (kg)

Sep. Oct. Nov. May

bc cd

ab d

ab

e a

b

b a

c e

b d

(4)

정경미

ㆍ

이동진

ㆍ

강수경

ㆍ

최광호

1000

다

(Fig. 6b).

주요 어종의 분포 특성

주요어종의분포특성을조사하기위하여월

1

^회^채집된^표 본자료를정량적으로변환하였다

.

^전갱이의^월별^어획량^변동 을살펴보면

, 2011

년도

6

월에어획량이

3

톤으로가장많았고 그외달에서는

0.002

^톤

(5

^월

)-0.6

^톤

(8

^월

)

^의^범위로^어획량이^적 었다

. 2012

년도에는

8

월에어획량이

2.3

톤으로가장많았고그 외 달에서는

0.002

^톤

(11

^월

)-0.8

^톤

(9

^월

)

^이었다

.

^연평균^어획량 은

2011

^년도와

2012

^년도^모두

0.6

^톤으로^같았다

. Scheffé’s test

Table 1. Species composition collected by a set net in Dapo (2011-

2012) site. Number of total species within each family is shown below

2011 2012

Total number of species 46 41

Class Crustacea Order Decapoda

Family Dorippidae 1

Family Penaeidae 1

Class Cephalopoda Order Octopoda

Family Octopodidae 1

Order Sepioidea

Family Sepiidae 1 2

Family Sepiolidae 1

Order Teuthoidea

Family Loliginidae 2 3

Family Ommastrephidae 1 1

Class Chondrichthyes Order Rajiformes

Family Rajidae 1

Class Actinopterygii Order Anguilliformes

Family Congridae 1

Order Clupeiformes

Family Engraulidae 2 1

Family Clupeidae 4 4

Order Osmeriformes

Family Argentinidae 1

Order Aulopiformes

Family Synodontidae 1

Order Mugiliformes

Family Mugilidae 1

Order Beloniformes

Family Belonidae 1

Order Scorpaeniformes

Family Scorpaenidae 1

Family Aploactinidae 1

Family Triglidae 1 1

Family Platycephalidae 1

Order Perciformes

Family Acropomatidae 1 1

Family Apogonidae 1 1

Family Sillognidae 1 1

Family Coryphaenidae 1

Family Carangidae 3 5

Family Sparidae 1

Family Mullidae 1

Family Chaetodontidae 1

Family Teraponidae 1

Family Oplegnathidae 1 1

Family Embiotocidae 1 2

Family Labridae 1

Family Pholididae 1

Family Ammodytidae 1

Family Tripterygiidae 1

Family Blenniidae 1

Family Gobiidae 3

Family Siganidae 1

Family Sphyraenidae 1 2

Family Trichiuridae 1 1

Family Scombridae 2 2

Family Centrolophidae 1

Order Pleuronectiformes

Family Pleuronectidae 2

Order Tetraodontiformes

Family Monacanthidae 1 2

Family Tetraodontidae 2 1

Fig. 5. Proportions of species composition in terms of numbers caught during 2011 (gray) and 2012 (black) set net fishery in Dapo.

34°30'

127°30' 128°00'

Dolsan Is.

128°30'

0 20 50 70 100

20112012

Species

Proportion (%)

67.8

18.7 27.4 74.1

2.7 0.2 0.9 6.4

0.1 0.4 0.1 0.2

May June July Aug.

Month

Sep. Oct. Nov.

0 10 20 30

Number of species

A

Dapo (2011) Dapo (2012)

0.0 0.3 0.6 0.9 1.5 1.2

Diversity (H')

B

A

Body weight (g)

R² = 0.98

0 0 10

Dapo (2011) Dapo (2012)

20 30

60 120 180 240

B

Body weight (g)

Fork lengthe (cm)

BW = 0.0037 x FL^3.212 R² = 0.93

0 0 5 10 15

5 10 15 20 35°00'

34°30'

127°30' 128°00'

Dolsan Is.

Yeosu Namhae

Geoje Is.

Dapo★ Neungpo

128°30'

0 20 50 70 100

20112012

Species

Proportion (%)

67.8

18.7 27.4 74.1

2.7 0.2 0.9 6.4

0.1 0.4 0.1 0.2

May June July Aug.

Month

Sep. Oct. Nov.

0 10 20 30

Number of species

A

Dapo (2011) Dapo (2012)

0.0 0.3 0.6 0.9 1.5 1.2

Diversity (H')

B

A

Body weight (g)

R² = 0.98

0 0 10

Dapo (2011) Dapo (2012)

20 30

60 120 180 240

B

Body weight (g)

Fork lengthe (cm)

BW = 0.0037 x FL^3.212 R² = 0.93

0 0 5 10 15

5 10 15 20

Fig. 6. Monthly variations of (A) number of species and (B) species diversity (H') from May to November for 2011 (dotted line) and 2012 (solid line) set net fishery in Dapo.

(5)

다포 정치망 어획물의 종조성 및 분포 특성

1001

의사후검정을이용하여가랑이체장의변화에따른동일집단 군으로구분한결과

,

^가장^작은^체장의^전갱이가^출현한^시기는

2011

년도에는

6

월

(

중앙값

: 4.6 cm)

이었고

2012

년도에는

5, 6, 7, 11

^월

(

^{중앙값범위}

: 6.0-7.8 cm)

^이었다

.

^전갱이의^최고^가랑이 체장은

2011

^년도

11

^월의

14.6 cm, 2012

^년도

10

^월의

13.0 cm

로나타나면서

,

상대적으로가을에가장큰전갱이가다수출현 한다는것을알수있었다

(Fig. 7).

전갱이의가랑이체장범위는

2011

년도에

3.3 (

최소값

)-19.3 (

최대값

) cm, 2012

^년도에는

3.2-23.9 cm

^였으며

,

^이는

50%

^성숙

체장인

26.6 cm

^보다^작은^개체가^출현하여^다포^연안에서^정치

망으로어획되는전갱이는모두미성숙단계였다

.

평균체장은

2011

^년도에

10.1 cm, 2012

^년도에

7.8 cm

^로^{나타나면서}

2011

년도에다소큰전갱이가 출현하였다

(t test, P<0.001). 2011- 2012

^년 ^전갱이의 ^체중

-

^체장 ^관계식은 ^체중

=0.0088

^체장^3.144

(R

²

=0.98)

^이었다

(Fig. 8).

멸치는

2011

년도

5

월에

1

톤으로어획량이가장많았고

2012

년도에는

9

^월에

2.5

^톤으로^가장^많았다

.

^나머지^달에서는^어획 량변동범위가

2011

년도에

0.004

톤

(9

월

)-0.1

톤

(6,8

월

), 2012

년 도에

0.01

^톤

(11

^월

)-0.5

^톤

(6

^월

)

^이었다

.

^연평균^어획량은

2011

^년 도에

0.2

^톤

, 2012

^년도에는^이보다

2

^배^이상^증가한

0.5

^톤이었 다

. Scheffé’s test

의사후검정을시행한결과

,

가장작은길이 의멸치가채집된시기는

2011

^년도의

7, 9, 11

^월

(

^{중앙값범위}

: 4.5-5.0 cm)

이었고

2012

년도에는

7

월

(

중앙값

: 4.1 cm)

이었다

.

가장큰체장이채집된시기는

2011

^년도에

10

^월

(8.7 cm)

^이었고

2012

^년도에는

9

^월

(10.9 cm)

^로^나타났고

,

^이는^전갱이의^최고 가랑이체장이출현한시기보다

1

개월씩빨랐다

.

나머지달에 서는

2011

^년도에

4.8-7.3 cm

^의^범위로

, 2012

^년도에는

5.7-7.9 cm

의범위로출현하였다

(Fig. 9).

10,000 8,000 6,000 4,000 2,000 0

Day

Total catch (kg)

Dapo (2011) Dapo (2012)

5/1 5/16 5/31 6/15 6/30 7/15 7/30 8/14 8/29 9/13 9/28 10/1310/28 11/12 11/27

May June July Aug.

Month

Sep. Oct. Nov.

0 8 24

32 3,600

1,200

0 16

Operating days Catch per day (kg)

May 100

75 50 25

0 2011

June July Aug.

Month

Frequency (%)

Sep. Oct. Nov. May

2012

May 100

80 75 40 20

0

2011 June July Aug.

Month

Cumulative frequency (%)

Sep. Oct. Nov. May

Mature immature

27

18

9

0

6,000

4,000

2,000

May 0 2011

June July Aug.

Month

Fork length (cm) Catch (kg)

b a

c

cd d c e

a a

a

bc c ab

15 12 9 6 3 0

5,000 4,000 3,000 2,000 1,000

0 May

2011 June July Aug.

Month

Fork length (cm) Catch (kg)

Sep. Oct. Nov. May

bc cd

ab d

ab

e a

b

b a

c e

b d

Fig. 7. Monthly changes in fork length (cm) and total catch (kg) of jack mackerel Trachurus japonicus using the data of quantitative analysis caught during a set net fishery (2011-2012). Boxes represent the median, 25th and 75th percentiles with maximum (upper) and minimum (lower) values in each month. Different letters above the box plots indicate significant differences among months within each year (by Scheffé’s test; α≤0.05).

Fig. 8. Relationships between fork length (cm) and body weight (g) for (A) jack mackerel Trachurus japonicus and (B) anchovy Engraulis japonicus caught during 2011 (gray dots) and 2012 (black dots) set net fishery in Dapo.

(6)

정경미

ㆍ

이동진

ㆍ

강수경

ㆍ

최광호

1002

이두어종을합한개체수의우점율은

2011

^년도에

96.2%, 2012

년도에는

92.8%

^로^{나타나면서}^이^지역^정치망^어업의^대표^어

종임을알수있었다

.

^다음으로 ^많이^출현한^어종은^청어

,

^고 등어

,

^{꼬치고기였으며}

,

^이^세^어종을^합한^개체수의^우점율은

2011

년도에

3.7%, 2012

년도에는

7.0%

이었다

.

나머지어종은

모두

0.2%

^미만으로^{출현하였다}

.

^인근의^거제도^능포^연안의

2003-2004

^년^정치망^{어획물에서는}^총

48

^종이^{출현하였고}

,

^생 체량면에서나타난우점종은전갱이

57.5%,

^갈치

12.9%,

^멸치

10.6%,

^고등어

6.9%,

^청어

4.5%,

^살오징어

2.8%

^의^순이었다

(Cha, 2009b).

본조사해역과능포연안정치망어업의공통되

는우점종은전갱이

,

^멸치

,

^고등어

,

^청어이며

,

^이들이^거제도^동 부와남동부연안의표층어류군집을대표하는회유성어종임을 알수있었다

.

^반면

,

^본^{조사해역에서}^저어류를^주^{어획대상으} 로하였던저인망조사에서는우점종으로줄비늘치

,

^칠서대

,

^노 랑촉수가나타났고

(Youn and Shim, 2000),

거제도남서부연

8,000 6,000 4,000 2,000 0

Day

Total catch (kg)

Dapo (2011) Dapo (2012)

5/1 5/16 5/31 6/15 6/30 7/15 7/30 8/14 8/29 9/13 9/28 10/1310/28 11/12 11/27

May June July Aug.

Month

Sep. Oct. Nov.

0 8 24

32 3,600

1,200

0 16

Operating days Catch per day (kg)

May 100

75 50 25

0 2011

June July Aug.

Month

Frequency (%)

Sep. Oct. Nov. May

2012

May 100

80 75 40 20

0 2011

June July Aug.

Month

Cumulative frequency (%)

Sep. Oct. Nov. May

Mature immature

2012

27

18

9

0

6,000

4,000

2,000

May 0 2011

June July Aug.

Month

Fork length (cm) Catch (kg)

b a

c

cd d c e

a a

a

bc c

ab

15 12 9 6 3 0

5,000 4,000 3,000 2,000 1,000

May 0 2011

June July Aug.

Month

Fork length (cm) Catch (kg)

bc cd

ab d

ab

e a

b

b a

c e

b d

Fig. 9. Monthly changes in fork length (box plot) and total catch (line plot) of anchovy Engraulis japonicus using the data of quantitative analysis caught during a set net fishery (2011-2012). Boxes represent the median, 25th and 75th percentiles with maximum (upper) and minimum (lower) values in each month. Different letters above the box plots indicate significant differences among months within each year (by Scheffé’s test; α≤0.05).

Fig. 10. Cumulative frequency (%) comparing the relative biomass of mature and immature anchovy Engraulis japonicus in each month caught during a set net fishery (2011-2012).

2,000 0

Day

Total catch (kg)

5/1 5/16 5/31 6/15 6/30 7/15 7/30 8/14 8/29 9/13 9/28 10/1310/28 11/12 11/27

May June July Aug.

Month

Sep. Oct. Nov.

0 8 24

32 3,600

1,200

0 16

Operating days Catch per day (kg)

May 100

75 50 25

0

2011 June July Aug.

Month

Frequency (%)

Sep. Oct. Nov. May

May 100

80 75 40 20

0 2011

June July Aug.

Month

Cumulative frequency (%)

Sep. Oct. Nov. May

Mature immature

2012

27

18

9

0

6,000

4,000

2,000

May 0 2011

June July Aug.

Month

Fork length (cm) Catch (kg)

b a

c

cd d c e

a a

a

bc c

ab

15 12 9 6 3 0

5,000 4,000 3,000 2,000 1,000

May 0 2011

June July Aug.

Month

Fork length (cm) Catch (kg)

bc cd

ab d

ab

e a

b

b a

c e

b d

미성어만 출현하였던전갱이와 달리멸치는성어와미성어 가모두 출현하였지만

,

^미성어의 ^어획률은

2011

^년도에

10

^월 을제외하면

84-100%

^까지

, 2012

^년도에는

9

^월을^제외하면

73- 100%

로매우높았다

(Fig. 10).

멸치의가랑이체장범위는

2011

년도에

2.8 (

^최소값

)-11.7 (

^최대값

) cm, 2012

^년도에는

2.6-13.3 cm

^였으며

,

^{평균체장은}

2011

^년도에

6.0 cm, 2012

^년도에

6.8 cm

^로^다소^차이를^보였다

(t test, P<0.001). 2011-2012

년멸치 의체중

-

^체장^관계식은^체중

=0.0037

^체장^3.312

(R

²

=0.93)

^로^나타 났다

(Fig. 8).

고 찰

거제도다포연안에서조사기간동안정치망어업으로어획 된어획물은

2011

^년도에^총

12

^목

36

^과

46

^종

, 2012

^년도에는^총

9

목

25

과

41

종이었다

.

전갱이와멸치는최다출현한어종이며