Maturity and Spawning of Sebastes thompsoni in the Coastal Waters off Ulleungdo, Korea

한수지 49(3), 404-409, 2016

404

Copyright © 2016 The Korean Society of Fisheries and Aquatic Science pISSN:0374-8111, eISSN:2287-8815 Korean J Fish Aquat Sci 49(3),404-409,2016

Note

서 론

불볼락

(Sebastes thompsoni)

^{은 쏨뱅이목}

(Scorpaeniformes)

양볼락과

(Scorpaeridae)

에속하며우리나라서해를제외한전

해역

,

^{일본북해도이남연안}

,

^{동중국해에분포하고}

(Choi et al., 2002; NFRDI, 2004),

수심

40-150 m

암초지역에서서식하는 어류이다

(Kim et al., 2005).

^{식성은새우류}

(Macrura),

^난바다곤 쟁이류

(Euphausiacea),

^어류

(Pisces),

^두족류

(Cephalopoda)

^등 을섭이하는갑각류식성어류로밝혀져있다

(Huh et al., 2008).

불볼락이속해있는양볼락과어류는세계에약

56

^속

418

^종으로 우리나라에는

17

속

45

종이출현하고있다

(Nelson, 2006; Kim,

2011).

^{불볼락은일반적으로주낙과자망에의해어획되고}

,

^취

미

,

^{여가활동의대상으로선상외줄낚시로어획이되는것으로} 알려져있다

(Baeck et al., 2010).

울릉도에서는자망에의해대 부분어획이되고있으며

‘

^메바리

’

라는방언으로불리어지고있 고

,

남해안에서는

‘

열기

’

라는방언으로불리어지며

(Lee et al.,

1998),

조피볼락

(Sebastes schlegeli),

볼락

(Sebastes inermis)

등과함께경제성이높은어종이다

(Kim, 2011).

^{불볼락의생태}

학적연구는일본에서연령과성장

(Suuki et al., 1978),

^불볼락 의생활사

(Yamada, 1980),

초기생활사에관한보고

(Nagasawa and Kobayashi, 1995)

^등이있다

.

^{국내에서는불볼락과개볼락} 의난형태및자어의형태발달

(Han et al., 1996),

경남삼천포 해역의불볼락생식주기연구

(Lee et al., 1998),

^{부산주변해역} 의불볼락식성

,

^{생식생태연구}

(Huh et al., 2008; Baeck et al., 2010),

연령과성장연구

(Kim, 2011)

등이있다

.

그러나국내의 불볼락연구는난류의영향을많이받는남해안을중심으로이 루어졌고

,

울릉도는북한한류와동한난류의영향을모두받는 해역으로어류의산란생태에차이를보일수있다

.

^{그리고울릉} 도연안의주요수산자원인불볼락의자원관리를위해자원생 태학적정보가반드시필요하다

.

따라서본연구는울릉도주 변해역에서서식하는불볼락의자원생태학적정보를얻기위 해암수별생식소발달과정및생식소숙도지수의월변화

,

난

울릉도 연안에 서식하는 불볼락(Sebastes thompsoni)의 성숙과 산란

양재형·이재봉 ¹ *·이해원 ² ·차형기 ³ ·김소라 ³ ·허요원 ¹

국립수산과학원 동해수산연구소,

¹

국립수산과학원 원양자원과,

²

국립수산과학원 연구협력과,

³

국립수산과학원 연근해자원과

Maturity and Spawning of Sebastes thompsoni in the Coastal Waters off Ulleungdo, Korea

Jae Hyeong Yang, Jae Bong Lee

¹

*, Hae Won Lee

²

, Hyung Kee Cha

³

, So Ra Kim and Yo Won Heo

East Sea Fisheries Research Institute, National Institute of Fisheries Science, Gangneung 25435, Korea

1 Distant Water Fisheries Resources Research Division, National Institute of Fisheries Science, Busan 46083, Korea

2 Research Cooperation Division, National Institute of Fisheries Science, Busan 46083, Korea

3 Coastal Water Fisheries Resources Research Division, National Institute of Fisheries Science, Busan 46083, Korea We investigated the maturation and spawning of Sebastes thompsoni in the coastal waters off Ulleungdo, based on samples collected by gill net from March 2013 to February 2014. We analyzed monthly changes in maturity stage, gonadosomatic index (GSI), egg diameter, fecundity, and total length (TL) at 50% group maturity. The average TLs of female and male S. thompsoni were 22.6 cm and 22.5 cm, respectively. The main parturition period of females was during March and April. The GSI of females began to increase in January, and reached a maximum in March.

The GSI of male reached a maximum between January and February. The spawning period of males was shorter than that of females. The egg diameter during gestation stage was 1.4±2.1 mm. The TL of females at 50% group maturity was 22.3 cm.

Key words: Sebastes thompsoni , Maturity, Spawning, Ulleungdo

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.2016.0403 Korean J Fish Aquat Sci 49(3) 403-409, June 2016

Received 24 October 2015; Revised 14 January 2016; Accepted 15 April 2016

*Corresponding author: Tel: +82. 51. 720. 2323 Fax: +82. 51. 720. 2277

E-mail address: [email protected]

불볼락의 성숙과 산란

405

경

,

^포란수

,

^{성숙체장등을파악하여산란생태를밝히고자한다}

.

재료 및 방법

본연구에사용된불볼락시료는울릉도주변해역에서자망 으로어획한것을매월채집하였다

(Fig. 1).

^{조사기간은}

2013

년

3

^월부터

2014

^년

2

^{월까지이고}

,

^{기상악화로조업이이루어지} 지않은

2013

년

7, 11, 12

월은제외되었다

. 10

월부터

12

월사이 에

44

^{일이풍랑주의보와풍랑경보등조업에적합하지않은기} 상조건으로인하여시료를어획할수없었다

(National Climate Data Service System, sts.kma.go.kr).

^{채집된시료는실험실에} 서암

·

^{수를구분하여전장}

(TL)

^은

0.1 cm

^까지

,

^체중

(BW)

^은

0.1 g

까지

,

그리고생식소중량

(GW)

은

0.01 g

까지측정하였다

.

불볼락의생식소발달과정을알아보기위하여생식소의외부 형태를조사하였고

,

^{생식소크기}

,

^색조

,

^{난의투명상태}

,

^난립의 크기등을기준하여생식소성숙단계를육안으로관찰하였다

.

성숙단계는암컷의경우미숙

(Immature),

^중숙

(Maturing),

^완 숙

(Marture),

임신

(Gestation),

출산및회복기

(Parturition and recovery)

^의

5

^{단계로구분하였고}

,

^{수컷은미숙}

(Immature),

^중숙

(Maturing),

^완숙

(Mature),

^방후

(Spent)

^의

4

^{단계로구분하였다}

.

산란기를추정하기위한생식소숙도지수

(GSI)

^{의월변화는}

다음식으로구하였으며

,

GSI =

^GW_RW ^{× 10}

³

여기서

, GW

는생식소중량

(g)

을

,

그리고

BW

는체중

(g)

을나 타낸다

.

불볼락의난경은생식소내난괴를개량

Gilson

^액

(Love and

Westphal, 1981)

^{에넣어분리한후}

,

^{난의장경을해부현미경}

(DE/MZ-125, LEICA)

과 영상분석프로그램

(Lampad, Zoo- toz)

^{을이용하여측정하였고}

,

^{자어는체내에서부화한자어와} 출산후자어의전장을측정하였다

.

포란수

(F)

^{는완숙및임신단계의개체중현미경으로관찰한} 결과

,

^{산란하지않은것으로판단된개체를선정하여일부난} 을절취하여계수하였고

,

다음식을이용하여습중량법으로구 하였다

.

F =

^{A - B}_C ^{× e}

여기서

, A

는난소의중량

, B

는난소껍질의중량

, C

는난소일부 의중량

,

^그리고

e

^는

C

^{의난수이다}

.

군성숙도는산란기로추정되는시기에중숙이상의개체를당 해연도산란가능군으로보고체급별성숙개체의비율로써구 하였으며

,

^로지스틱

(logistic)

^식

(Zhang, 1991)

^{을사용하여}

50%

성숙체장을추정하였다

.

P _i =

¹

1+e ^(b

¹

^-b

²

^TL

ⁱ

⁾

여기서

, P _i

^는

i

^{체장계급에서의군성숙비율}

, TL _i

^는

i

^{체장계급의} 전장

,

^그리고

b ₁ , b ₂

^{는상수이다}

.

결과 및 고찰

본연구에사용된불볼락은총

708

마리로암컷

420

마리

,

수컷

288

^{마리였으며}

,

^{전장범위는암컷의경우}

13.6-31.4 cm,

^수컷의 경우

14.8-30.1 cm

^범위였다

(Table 1).

^{평균전장은암}

·

^수각각

22.6 cm, 22.4 cm

였고

,

암

·

수간에평균전장이유사하였다

.

경 남삼천포에서조사된불볼락의전장을보면최대전장이

28 cm

이하로

(Lee et al., 1998)

본연구에비해최대전장이작게보고 되었고

,

^{부산주변해역의불볼락은체장}

(SL) 31.8 cm

^로

(Baeck et al., 2010)

^{본연구에비해최대전장이큰것으로보고되었다}

.

이와같이해역에따라전장에차이가나타나는것은조사방법 이자망

,

^연승

(Lee et al., 1998),

^정치망

(Baeck et al., 2010)

^으로 채집어구의차이로볼수있다

.

또한해양환경측면에서남해안 은난류의영향이크고

,

^{울릉도연안은난류와한류의영향을동} 시에받아먹이

,

^{수온등서식환경의차이가나타나는것이원} 인으로생각된다

.

불볼락의월별성숙도변화를살펴보면

(Fig. 2),

^{암컷의미숙}

단계는조사기간중

2

월을제외하고출현하였고

,

중숙단계는

1

월에서

2

^{월사이높은비율을보였다}

.

^{완숙단계는}

1

^{월에출현하} 기시작하였고

, 2

^{월에가장높은비율을보였다}

.

^{임신단계는}

3

월과

4

월에출현하였으며

3

월에높은비율을보였고

,

출산및회 Fig. 1. Sampling area of Sebastes thompsoni caught by gill net in

the coastal waters off Ulleungdo, Korea.

양재형

ㆍ

이재봉

ㆍ

이해원

ㆍ

차형기

ㆍ

김소라

ㆍ

허요원

406

복단계는

3

월부터

6

월까지나타났다

.

수컷의미숙단계는조사 기간동안전월에걸쳐출현하였고

,

^{중숙단계는}

1

^월과

2

^월에나 타났다

.

^{완숙단계는}

1

^{월에가장높은비율을보였으며}

, 3

^월까지

출현하였다

.

^{방후단계는}

2014

^년

1

^{월부터출현하기시작하여}

2

월에가장높은비율로출현하였다

.

본연구에서울릉도연안불볼락의출산기는

3-6

^{월로주출산} 기는

3-4

^{월로추정되었고}

,

^{경남삼천포연안은}

4-5

^월

(Lee et al., 1998),

부산주변해역불볼락의 산란기는

1-6

월

(Baeck et al.,

2010)

^{로나타났다}

.

^{일반적으로고위도서식어가저위도서식어}

보다산란이늦는것으로알려져있어

(Kim and Zhang, 1994),

동해안과남해안은위도및해양환경의차이로인해산란시기 에차이가있을것으로생각되었지만

,

^{울릉도연안과남해안의} 불볼락의출산기는큰차이가없는것으로생각된다

.

불볼락생식소숙도지수

(GSI)

^{의월변화를살펴보면}

(Fig. 3),

암컷의평균

GSI

값변화는

3

월에

18.6

으로높은값을보였고

, 2

^월에

8.59

^{로나타났다}

. 3

^월과

2014

^년

2

^{월을제외한기간에서} 는

5

^{이하로낮은값을보였다}

.

^{수컷의평균}

GSI

^변화는

2013

^년

3

월부터

2014

년

1

월전까지평균

1

내외의낮은값을나타내었으 며

, 2014

^년

1

^월에

2.54

^{로가장높은값을보였고}

, 2

^월까지

1.47

로높은값을유지하였다

.

수컷의

GSI

의월변화는암컷보다

1

개월이빠르게높은값을나타내어수컷이암컷보다성숙이빠 른것으로나타났다

.

불볼락은체내수정을통하여자어를출산하는난태생어종으 로알려져있고

(Kim et al., 2005),

^{체내수정을위해수컷의성숙} 이먼저이루어진다

(Lee et al., 1998).

울릉도연안의불볼락도 수컷이먼저성숙하는경향을보이며

,

^{부산주변해역과경남삼} 천포연안에서식하는불볼락연구결과와일치하였고

(Lee et al., 1998; Baeck et al., 2010),

같은난태생어류인양볼락과황 점볼락

(Sebastes oblongus),

쭈굴감팽

(Scropaena miostoma),

조피볼락

(Sebastes schlegeli)

역시이러한경향을보이는것으 Table 1. Number of individuals and size range of Sebastes thompsoni caught by gill net in the coastal waters off Ulleungdo, Korea

Female Male

Month Number Range of total length (cm) Number Range of total length (cm)

2013

Mar. 65 20.2-31.4 (22.3) 42 17.2-25.6 (21.9)

Apr. 66 19.4-28.2 (22.9) 51 20.0-26.5 (22.4)

May 71 19.8-28.1 (21.8) 54 20.1-29.6 (22.4)

Jun. 9 18.0-21.4 (19.9) - -

Jul. 52 19.8-23.2 (21.5) 46 19.6-23.2 (21.4)

Aug. 9 15.4-25.7 (21.5) 1 14.8-14.8 (14.8)

Sep. 16 20.5-25.1 (23.2) 24 20.5-25.6 (22.8)

Oct. 2 13.6-23.6 (18.6) - -

Nov. - - - -

Dec. - - - -

2014 Jan. 80 21.6-25.3 (23.6) 20 22.6-24.4 (23.6)

Feb. 50 22.0-24.6 (23.2) 50 21.6-24.6 (23.1)

Total 420 13.6-31.4 (22.5) 288 14.8-29.6 (22.4)

1

Parenthesis indicate average values.

Fig. 2. Monthly changes of maturity stages of Sebastes thompsoni caught by gill net in the coastal waters off Ulleungdo, Korea.

Female

Male 0

20 40 60 80 100

Mar. Apr. May Jun. Jul. Aug. Sep. Oct. Nov. Dec. Jan. Feb.

2013 2014

Month

immature maturing mature gestation parturition and recovery

0 20 40 60 80 100

Mar. Apr. May Jun. Jul. Aug. Sep. Oct. Nov. Dec. Jan. Feb.

2013 2014

Frequency(%) Frequency(%)

Month

immature maturing mature Spent

0 10 20 30 40 50 60

Mar. Apr. May Jun. Jul. Aug. Sep. Oct. Nov. Dec. Jan. Feb.

2013 2014

Month Female

0 1 2 3 4 5 6

Mar. Apr. May Jun. Jul. Aug. Sep. Oct. Nov. Dec. Jan. Feb.

2013 2014

G on ad os om at ic in de x( 10

3

) G on ad os om at ic in de x( 10

3

)

Month Male

0 20 40 60 80 100

1 2 3 4 5

Fr eq ue cn y (%)

Larvae size (mm) Mar. N : 45

0 10 20 30 40 50 60 70 80 90 100

0 5 10 15 20 25 30 35 40 45

G ro up m at ur ity (%)

Total length (cm) TL

_50%

= 22.3 cm (A)

(B) Egg diameter (mm)

Fr equ ency (% )

40 30 20 10

0 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 Apr. TL : 21.7-28.2 cm N : 592 40

30 20 10

0 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 Mar. TL : 20.6-31.4 cm

N : 275

Feb. TL : 22.3-24.0 cm N : 1,266 40

30 20 10

0 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 Jan. TL : 22.6-25.2 cm N : 1,092 40

30 20 10

0 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0

불볼락의 성숙과 산란

407

로알려져있다

(Chang et al., 1995; Lee et al., 1997; Baek et al.,

2000).

^{또한울릉도와같은위도에걸쳐있는일본의니가타현}

연안의불볼락연구에서도

(Suzuki et al., 1978),

^{암컷의생식소} 숙도지수가

1-3

월에높은값을보여본연구결과와유사하였다

.

Aida (1991)

^{는어류의생식주기를수온이나광주기등과같}

은환경적인요인과관련하여 춘계

,

춘하계

,

하계

,

춘추계

,

추 계및동계로

6

^{가지산란유형으로구분하였다}

.

^{본연구결과인} 울릉도연안불볼락의출산기는

3-5

^{월로춘계산란형인것으로} 추정된다

.

불볼락암컷의산란시기난경을살펴보면

(Fig. 4),

^성숙기에

접어드는

1

월에는평균난경이

3.5±2.5 mm

로나타났고

,

대부 분미숙단계의난들이

0.1-0.2 mm

^{로관찰되었다}

.

^{중숙단계와} 완숙단계가출현한

2

^{월에는평균난경이}

6.0±1.6 mm

^로나타 났고

,

최대난경이

1.1 mm

로관찰되었다

.

임신단계가출현한

3

월에는수정난과부화한자어를지닌어체들이나타났고

,

^난경 모드는

0.9-2.0 mm (

평균난경

1.4±2.1 mm)

로나타났으며

,

체 내에서부화한자어의전장은

2.61-4.37 mm (

^평균

3.59±0.40

mm, n=45)

^{로관찰되었다}

. 4

^{월에는출산및회복단계의개체}

가대부분나타났고

,

수정이되지않은

0.1-0.9 mm

의잔존난이 관찰되었다

.

어류의산란형태는난경모드의수와산란기동안의산란하는 횟수로산란형태를단봉

1

^회산란형

,

^{단봉수회산란형}

, 2

^봉분 할산란형

,

^다봉

1

^회산란형

,

^{다봉연속산란형의}

5

^{단계로추측}

해볼수있다

(Kim, 1993).

^{불볼락의난경조성을보면완숙단}

계및임신단계의난경모드가

0.9-2.0 mm

^{의단일모드를나타} 내어

1

^{회산란하는것으로판단되어단봉}

1

^{회산란형인것으로} 생각된다

. Lee et al. (1998)

의불볼락연구결과에서난군동기발 달형으로모체내에발생중인배의발단단계는모두동일한것 으로나타났고

,

^수정은

1

^{회일어난다고보고하여본연구결과} 를뒷받침해준다

.

Han et al. (1996)

^{은불볼락의난형태및자어형태발달의연}

구에서 체내에서 부화한자어의크기를

3.02-3.12 mm

로 보

고하였고

,

^출산

1

^{일째자어는전장}

3.6-4.14 mm (3.77±0.17 mm)

^{로보고하였다}

.

^{본연구의체내에서부화한자어전장은}

2.61-4.37 mm (

^평균

3.59 mm)

^로나타나

Han et al. (1996)

^의 Fig. 3. Monthly changes of gonadosomatic index (GSI) Sebastes

thompsoni caught by gill net in the coastal waters off Ulleungdo, Korea. Solid circles indicate mean GSI, and vertical bars indicate standard deviation of GSI.

Fig. 4. Frequency distributions of egg diameter (A) and larvae size (B) of Sebastes thompsoni caught by gill net in the coastal waters off Ulleungdo, Korea during spawning period.

Female

Male 0

20 40 60 80 100

Mar. Apr. May Jun. Jul. Aug. Sep. Oct. Nov. Dec. Jan. Feb.

2013 2014

Month

immature maturing mature gestation parturition and recovery

0 20 40 60 80 100

Mar. Apr. May Jun. Jul. Aug. Sep. Oct. Nov. Dec. Jan. Feb.

2013 2014

Frequency(%) Frequency(%)

Month

immature maturing mature Spent

0 10 20 30 40 50 60

Mar. Apr. May Jun. Jul. Aug. Sep. Oct. Nov. Dec. Jan. Feb.

2013 2014

Month Female

0 1 2 3 4 5 6

Mar. Apr. May Jun. Jul. Aug. Sep. Oct. Nov. Dec. Jan. Feb.

2013 2014

G on ad os om at ic in de x( 10

3

) G on ad os om at ic in de x( 10

3

)

Month Male

0 20 40 60 80 100

1 2 3 4 5

Fr eq ue cn y (%)

Larvae size (mm) Mar. N : 45

0 10 20 30 40 50 60 70 80 90 100

0 5 10 15 20 25 30 35 40 45

G ro up m at ur ity (%)

Total length (cm) TL

_50%

= 22.3 cm (A)

(B) Egg diameter (mm)

Fr equ ency (% )

40 30 20 10

0 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 Apr. TL : 21.7-28.2 cm N : 592 40

30 20 10

0 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 Mar. TL : 20.6-31.4 cm

N : 275

Feb. TL : 22.3-24.0 cm N : 1,266 40

30 20 10

0 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 Jan. TL : 22.6-25.2 cm N : 1,092 40

30 20 10

0 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0

Female

Male 0

20 40 60 80 100

Mar. Apr. May Jun. Jul. Aug. Sep. Oct. Nov. Dec. Jan. Feb.

2013 2014

Month

immature maturing mature gestation parturition and recovery

0 20 40 60 80 100

Mar. Apr. May Jun. Jul. Aug. Sep. Oct. Nov. Dec. Jan. Feb.

2013 2014

Frequency(%) Frequency(%)

Month

immature maturing mature Spent

0 10 20 30 40 50 60

Mar. Apr. May Jun. Jul. Aug. Sep. Oct. Nov. Dec. Jan. Feb.

2013 2014

Month Female

0 1 2 3 4 5 6

Mar. Apr. May Jun. Jul. Aug. Sep. Oct. Nov. Dec. Jan. Feb.

2013 2014

G on ad os om at ic in de x( 10

3

) G on ad os om at ic in de x( 10

3

)

Month Male

0 20 40 60 80 100

1 2 3 4 5

Fr eq ue cn y (%)

Larvae size (mm) Mar. N : 45

0 10 20 30 40 50 60 70 80 90 100

0 5 10 15 20 25 30 35 40 45

G ro up m at ur ity (%)

Total length (cm) TL

_50%

= 22.3 cm (A)

(B) Egg diameter (mm)

Fr equ ency (% )

40 30 20 10

0 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 Apr. TL : 21.7-28.2 cm N : 592 40

30 20 10

0 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 Mar. TL : 20.6-31.4 cm

N : 275

Feb. TL : 22.3-24.0 cm N : 1,266 40

30 20 10

0 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 Jan. TL : 22.6-25.2 cm N : 1,092 40

30 20 10

0 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0

양재형

ㆍ

이재봉

ㆍ

이해원

ㆍ

차형기

ㆍ

김소라

ㆍ

허요원

408

체내에서부화한자어보다크고출산자어보다작은것으로 나타났다

.

재생산에참여하는체장을알아보기위해

1-4

^{월간채집된암} 컷

261

개체를대상으로중숙단계이상의개체가당해연도산

란에참여하는것으로간주하여체급별

(1 cm)

^{성숙개체의출}

현율을조사하였다

(Fig. 5).

^{불볼락암컷은전장}

20 cm

^이하에 서성숙개체가출현하지않았고

, 21 cm

에서

32.6%, 25cm

에서

80%, 26 cm

^{이상에서전개체가성숙한것으로확인되었다}

.

^체 급별성숙개체의출현율을

logistic

식에적용시킨결과

,

불볼락 의

50%

^{성숙체장은암컷}

22.3 cm

^{로추정되었다}

.

Lee et al. (1998)

^{에의하면경남삼천포연안의불볼락암컷} 에대한생물학적최소형은

19.5 cm (SL)

로추정하였고

, 23.1-

24.0 cm

^{의체장범위가되면모든개체가성숙하는것으로보고}

하였다

.

부산주변해역의불볼락암컷의

50%

성숙체장은

20.11 cm

^{로추정하였으며}

, 25 cm

^{이상이되면모두성숙하는것으} 로보고하였다

(Baeck et al., 2010).

^또한

NFRDI (2004)

^에따

르면불볼락의최소성숙전장은약

22 cm

로알려져있다

.

불

볼락의

50%

^{성숙체장은남해안의연구결과와는약}

2 cm

^내

외로차이가나타났지만

, NFRDI (2004)

의보고와는유사하였 고

,

^{모든개체가성숙하는체장은}

Baeck et al. (2010)

^의연구에 서가장작은것으로보인다

.

^{불볼락의성숙시기연령은본연} 구에서성장에대한부분을고려하지않아연령을추정할수없 었으나

,

^{우리나라남해안의불볼락연령과성장특성연구결과}

(Kim, 2011)

를통해성숙연령을추정해보면

3.9

세로추정되었 고

,

^또한

NFRDI (2004)

^{에알려진연령으로추정해보면약}

4

세로추정되었다

.

본연구결과는울릉도연안에서식하는불볼락에대한성숙과 산란에관한기초자료를제공한다

.

^{울릉도연안은아직까지상} 업어선의조업이크게없으며

,

수산자원의보고로서많은어종 들이분포하고있다

.

^{또한동해안의오른쪽에위치하고있어대}

마난류와북한한류의영향으로기후변화에따른출현어종의생 태특성을연구하기에좋은곳이다

.

따라서

,

미래수산자원의관 리를위해울릉도주변해역의수산자원에대한종합적이고많 은생태연구가수행되어야할것으로생각된다

.

사 사

본연구는국립수산과학원수산시험연구사업

(R2016031)

의 지원에의해수행되었습니다

.

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Female

Male 0

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Mar. Apr. May Jun. Jul. Aug. Sep. Oct. Nov. Dec. Jan. Feb.

2013 2014

Month

immature maturing mature gestation parturition and recovery

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2013 2014

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2013 2014

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)

Month Male

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1 2 3 4 5

Fr eq ue cn y (%)

Larvae size (mm) Mar. N : 45

0 10 20 30 40 50 60 70 80 90 100

0 5 10 15 20 25 30 35 40 45

G ro up m at ur ity (%)

Total length (cm) TL

_50%

= 22.3 cm (A)

(B) Egg diameter (mm)

Fr equ ency (% )

40 30 20 10

0 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 Apr. TL : 21.7-28.2 cm N : 592 40

30 20 10

0 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 Mar. TL : 20.6-31.4 cm

N : 275

Feb. TL : 22.3-24.0 cm N : 1,266 40

30 20 10

0 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 Jan. TL : 22.6-25.2 cm N : 1,092 40

30 20 10

0 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0

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