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Evaluation of Commercial Extruded Pellets and Raw Fish-Based Moist Pellets for the Growth and Quality of Korean Rockfish Sebastes schlegeli Cultured in Net-Cages

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(1)

282

서 론

어류양식을위해소요되는생산비용중에서사료비가차지하는

비중은어종에따라차이가있지만

, 40-60%

다른요인에

상대적으로높은비율을차지하고있다

.

또한사료는양식장 수질환경질병과함께가장중요하게고려되어야요인이

.

어류양식업이경쟁력을갖기위해서양식어업인은우량종 묘를선정하여품질이우수하면서도경제적인배합사료로적은 노동력을투입하여최대한빠른시일내에상품크기로키워 매하여야높은수익을올릴있다

.

배합사료는생사료에비해 인건비각종시설운영경비를절약할있으며

,

영양학적으 균형잡힌사료를만들있고

,

보관과취급이용이하고

,

급과가격이안정적이다

(Kim et al. 2009).

이와같은배합사료의장점과배합사료사용에대한필요성 인식하고있지만양식장에서생사료

(raw fish-based moist

pellet; MP)

사용비중이여전히계속높은이유는배합사료

생사료에비해상대적으로고가이고

,

성어기에성장이부진 하며

,

출하시에어체의비만도나육질이생사료를사육한어체 비해떨어진다고인식하기때문이다

.

현재상업용배합사료 개발되어판매되고있지만대상어종의성장사료효율 면에서생사료에비해크게개선되어있지않기때문에양식어 업인으로부터외면당하고있는실정이다

.

그렇지만생사료는 양식어류에공급상당량이유실되어수중으로유입되게

.

이렇게유실된생사료는수질환경을저하시키는원인이 때문에해산어양식용먹이로써배합사료사용은친환경적 양식측면에서도필수적으로늘어나야한다고있다

.

생사료사용은자원남획어장환경악화로귀결되면서

Article history;

Received 15 February 2013; Revised 10 June 2013; Accepted 14 June 2013

*Corresponding author: Tel: +82. 54. 230. 3630 Fax: +82. 54. 230. 3699 E-mail address: [email protected]

Kor J Fish Aquat Sci 46(3) 282-286, June 2013 http://dx.doi.org/10.5657/KFAS.2013.0282 pISSN:0374-8111, eISSN:2287-8815

ⓒ The Korean Society of Fishereis and Aquatic Science. All rights reserved

This study was conducted to compare extruded pellets (EP) and soft extruded pellets (SEP) with a raw fish-based moist pellet (MP) diet on the growth and flesh quality of Korean rockfish Sebastes schlegeli . Three groups of 20,000 fish (initial mean weight 133 g) per net-cage (6×12×7 m) were fed commercial EP, SEP or MP for 16 months. The survival of fish fed SEP was higher than those of fish fed EP or MP. The highest growth performances were observed in the mean weight gain, total weight gain, and feed efficiency of fish fed MP, followed by those fed EP and SEP. Among the fish fed on extruded pellets, the total weight gain of fish fed SEP was higher than that of those fed EP, while fish fed EP grew faster than those fed SEP. No notable differences in body composition, sensory scores or textural properties of the dorsal muscle were observed in fish fed on EP, SEP or MP. Thus, it is suggested that extruded pellets, rather than raw fish-based moist pellets, could be fed to Korean rockfish without compromis- ing flesh quality.

Key words: Extruded pellet, Raw fish-based moist pellet, Korean rockfish, Growth, Flesh quality

해상가두리 양식장에서 배합사료 및 생사료 공급에 따른 조피볼락 (Sebastes schlegeli)의 성장 및 육질 비교

국립수산과학원 사료연구센터

Maeng Hyun Son, Kyoung-Duck Kim*, Kang-Woong Kim, Shin-Kwon Kim, Bong-Joo Lee and Hyon-Sob Han

손맹현ㆍ김경덕*ㆍ김강웅ㆍ김신권ㆍ이봉주ㆍ한현섭

Evaluation of Commercial Extruded Pellets and Raw Fish- Based Moist Pellets for the Growth and Quality of Korean

Rockfish Sebastes schlegeli Cultured in Net-Cages

Aquafeed Research Center, National Fisheries Research & Development Institute, Pohang 791-923, Korea

(2)

따라클로로포름과메탄올혼합액

(2:1)

으로지질을추출 하였고

, 14% BF

3

-methanol

지방산을

methylation

시킨

, capillary column (SPTM-2560, 100 m×0.25 mm i.d., film thickness 0.2 μm, USA)

사용하여

gas chromatography (HP- 6890Ⅱ, USA)

지방산을분석하였다

.

육질평가

사료종류별실험어의육질평가를위하여관능평가어육의 물성측정을실시하였다

.

관능평가는양식어업인

,

사료회사 관련연구원

25

명을대상으로실험어의등근육을분리하여

,

색택

,

,

질감기호도에대하여

9

척도법으로실시하였

.

어육의물성측정은실험어의등근육

(0.9×0.9×1.5 cm)

채취하여호일에얼음위에

1

시간올려

Rheometer (Compac-100, Sun Scientific. Co., Japan)

사용하여탄력성

,

원고갈과환경악화로인한질병증가등의불이익을초래할

있다

(Lee et al. 2005).

조피볼락은넙치와함께우리나라에서가장주요한해수 식어종이다

.

조피볼락양식을위한육성용먹이로생사료대체 위한배합사료와생사료효능평가에관한연구들

(Lee and Jeon 1996a; 1996b; Kim et al. 2008)

꾸준하게수행되어

.

그러나이러한연구들은실험실규모의육상수조에서 수행되었거나

,

단기간의사육실험에의한결과들이대부분 이다

.

또한배합사료를사용하여가두리양식장에서조피볼락 상품크기까지사육하며생사료와비교한연구어체품질 대하여평가한연구들은매우제한적인실정이다

.

연구에 서는조피볼락양식용으로시판되는건조배합사료

(extruded pellet; EP)

반건조배합사료

(soft extruded pellet; SEP)

사료를각각공급하면서가두리현장양식장에서상업적규모 사육실험을수행하여조피볼락의성장도

,

체조성변화

,

어육 관능검사물성평가를비교실시하였다

.

재료 및 방법

실험설계 및 실험어 사육관리

실험사료는조피볼락용상품배합사료

2

(EP, SEP)

양식 현장에서주로사용하는

MP

3

종류를사용하였다

. EP

SEP

상업용으로판매되고있는조피볼락용사료를구매하 사용하였고

, MP

냉동잡어와분말사료를

95:5

무게 율로혼합하여성형

,

제조한냉동보관하면서먹이공급시마 사용하였다

.

실험사료의영양성분분석결과를

Table 1

타내었다

.

사육실험은거제지역양식장의해상가두리

(6×12×7 m) 3

개에최초평균체중

133 g

실험어를

20,000

마리씩수용하여

2010

3

월에서

2011

7

월까지

16

개월간실시하였다

.

실험어 사육관리는일반가두리양식현장에서의방식과동일하게 시하였고

,

실험사료는

1

1

만복공급하였다

.

사육기간

안의수온은

9-24℃

였다

.

사육실험시작시와종료시가두리

수용된모든실험어의전체무게를측정하였으며

,

사육기간 동안매월실험구마다

30

마리의샘플을채취하여성장도 화를조사하였다

.

성분분석

실험사료와실험어의수분은

135℃

에서

2

시간건조측정 하였으며

,

조단백질

(N×6.25)

Auto Kjeldahl System (Ger- hardt VAP50OT/TT125, KG, Germany)

사용하여 분석하 였다

.

조지방은조지방추출기

(Velp SER 148, Usmate, Italy)

사용하여

ether

추출한측정하였으며

,

조회분은

550℃

4

시간동안회화측정하였다

.

실험사료의아미노산함량 아미노산자동분석기

(Biochrom 30, England)

사용하여 분석하였다

.

지방산분석을위하여

Folch et al. (1957)

방법

Table 1. Nutrient contents of the experimental diet Diets

EP SEP MP

Proximate composition (dry matter basis)

Moisture (%) 9.8 23.6 70.6

Crude protein (%) 51.7 49.5 61.2

Crude lipid (%) 13.2 16.5 22.0

Ash (%) 10.9 15.8 13.0

Major fatty acids (% of total fatty acids)

C14:0 3.8 5.3 5.3

C16:0 19.4 18.6 22.4

C16:1n 5.3 6.7 7.2

C18:0 4.4 5.4 4.8

C18:1n-9 19.6 17.7 17.8

C18:2n-6 14.3 12.0 3.0

C18:3n-3 2.2 3.4 7.7

C20:1n-9 1.4 2.1 1.9

C20:3n-3 1.0 2.2 2.8

C20:4n-6 0.7 0.8 0.5

C20:5n-3 10.7 9.2 7.2

C22:5n-3 3.1 1.8 0.8

C22:6n-3 11.9 10.9 11.9

Essential amino acids (% of protein)

Arginine 5.6 6.0 5.7

Histidine 2.8 2.8 3.2

Isoleucine 4.1 4.2 4.7

Leucine 7.6 7.9 8.1

Lysine 6.9 7.6 8.8

Methionine 2.2 2.8 3.1

Phenylalanine 4.3 4.4 4.3

Threonine 4.0 4.2 4.9

Valine 4.7 5.1 5.7

EP; extruded pellet, SEP; Soft extruded pellet, MP; raw fish-based moist pellet.

(3)

검성

,

경도강도를측정하였다

.

사료별로실험어

5

마리에 대하여

1

마리당

5

회씩측정하였다

.

통계처리

관능평가 물성측정 결과의 통계처리는

SPSS (Version 11.5, USA)

프로그램을사용하여

One-way ANOVA test

시하였다

.

결과 및 고찰

최초체중

133 g

조피볼락을해상가두리에서사료종류별

사육하며

,

월별로측정한실험어의평균체중변화를

Fig. 1

나타내었다

.

모든실험구에서사육실험

10

개월째를제외하 고는사육기간동안직선적으로체중이증가하는경향을보였

.

사육실험

10

개월째에체중이증가하지않은것은기간이

연중수온이가장낮은

1

월로써평균수온

8.8℃

상당히낮은

수온을나타내었다

.

육상수조에서

6.8 g

치어기조피볼락을

MP

공급하며

500 g

이상의상품크기까지사육한

Lee et al.

(1995a)

연구에서도연구결과와유사하게사육기간동안

직선적으로체중이증가하는경향을보였다

.

16

개월간사육실험

,

생존율은

SEP

실험구가

76%, MP

험구가

71%, EP

실험구가

66%

였으며

,

모든실험구에서전반

적으로양호한결과를보였다

(Table 2).

연구의성장도결과

값은반복구가없어서통계처리를수는없었으나

,

실험어의 평균증체량은

MP

실험구가

358 g

가장높았으며

, EP

실험 구가

323 g

SEP

실험구가

301 g

이었다

.

최종체중도

MP

험구가

490 g

가장높았으며

, EP

실험구가

457 g

SEP

험구가

435 g

이었다

.

증체량은

MP

실험구가

4,477 kg

으로 가장높았으며

, SEP

실험구가

3,925 kg, EP

실험구가

3,359 kg

순이었다

.

사료종류별최종생산량은

MP

실험구가

6,992 kg

가장많았으며

, SEP

실험구가

6,607 kg, EP

실험구가

6,039

kg

순이었다

. EP

실험구와

SEP

실험구의평균증체량은

MP

실험구와비교하여각각

90%

84%

나타내었으나

,

체량은

EP

실험구와

SEP

실험구가

MP

실험구와비교하여

75%

88%

나타내었다

.

이와같이

EP

SEP

실험구는

MP

공급한실험구에비하여다소낮은성장결과를보였다

.

연구에서

MP

실험구가좋은성장을보인것은

MP

사료의 영양소단백질과지질함량이

61%

22%

EP

SEP

료의단백질함량

49.5-51.7%

지질함량

13.2-16.5%

비하 현저히높기때문으로판단된다

.

조피볼락은육식성이강하 단백질요구량이높으며

,

에너지원으로탄수화물보다는 이용성이높은것으로보고되었다

(Lee et al. 1993; Lee and Kim 2009). Lee et al.(1993)

broken line model

추정한 피볼락의 단백질요구량을

40%

보고하였으나

,

이차회귀곡

선으로추정한최대성장을위한단백질요구량은

51-57%

보고하였다

.

연구에사용된배합사료의단백질함량은

50

52%

였으나

,

사용된단백질원의종류에대하여명확히 없지만식물성단백질원이첨가되었을경우단백질이용률

감소할있을것으로판단된다

(Lee 2002).

육상수조에서

실험배합사료시판배합사료와

MP

공급하며

15

동안

조피볼락

(

최초체중

125 g)

사육효과를비교한기존의연구

(Lee and Jeon 1996b)

에서도단백질원으로어분과육분

,

콘글 루텐밀

,

대두박혈분을혼합첨가하여제조한실험배합사료 상품배합사료공급구가

MP

공급구에비하여성장률이 소하는결과를나타내었으나

,

단백질원으로어분만을사용한 실험배합사료공급구는

MP

실험구와통계적인차이를보이 않았다

.

또한단백질원으로어분만을사용하여제조한배합 사료로최초체중

69 g

조피볼락을

11

개월간사육하며

MP

사육효과를비교한

Lee et al. (1995b)

연구에서도배합사료

MP

공급구간에성장도에서차이를보이지않았다

.

이러한 결과들로

,

조피볼락배합사료제조시어분이외의단백질 원료를일정수준이상으로혼합할경우

MP

사료에비하여 효능이감소할가능성이높을것으로판단된다

.

현재조피볼 Fig. 1. Mean body weight of Korean rockfish Sebastes schlegeli

and mean water temperature for the experimental periods.

EP; extruded pellet, SEP; Soft extruded pellet, MP; raw fish-based moist pellet.

500 400 300 200

100Initial 1 2 3 4 5 6 7 8 9 10 11 12 13 14

Months (temperature°C)

EP SEP MP

Mean body weight (g)

(12.4)(15.3)(18.9)(20.7)(22.7)(24.4)(19.3)(15.8)(11.9)(8.8)(9.2)(10.4)12.4)(14.7)

Table 2. Growth performance of Korean rockfish Sebastes schlege- li fed the experimental diets

Diets

EP SEP MP

Initial mean weight (g/fish) 134 134 132 Initial total weight (kg/cage) 2,680 2,682 2,515

Mean weight gain (g/fish) 323 301 358

Total weight gain (kg/cage) 3,359 3,925 4,477 Final mean weight (g/fish) 457 435 490 Final total weight (kg/cage) 6,039 6,607 6,992

Survival (%) 66 76 71

Feed efficiency (%)1 38 41 62

1 Fish wet weight gain × 100/feed intake (dry matter).

EP; extruded pellet, SEP; Soft extruded pellet, MP; raw fish-based moist pellet.

(4)

락을양식하는우리나라대부분의양어가들이생사료를사용 하고있다는점을감안할

,

조피볼락배합사료의단백질원 택에더욱더신중하여야하며

,

배합사료단가를낮추기위한 대체단백질원이용성에관해서는단기간의사육실험에 결과도출보다는양식현장에적용이가능한보다실용적 연구들이요구된다

.

실험에사용된종류의배합사료를섭취한실험어

체별평균증체량은

EP

실험구가

SEP

실험구에비하여높았지

,

중체량은오히려

SEP

실험구가

EP

실험구보다높은

과를보였는데

,

이는

SEP

실험구의생존율이 실험구에

하여높았기때문이다

.

이와같이개체별성장도는

EP

실험구 우수하였지만생존율에서는

SEP

나은결과를보였는

,

이러한차이가

EP

SEP

같은사료의형태수분 량의차이에의한것인지연구의결과만으로판단하기는 렵다

.

또한사료의단백질함량은

EP

SEP

각각

51.7

49.5%

였으며지질함량은각각

13.2

16.5%

다소차이는 있으나

,

사료의단백질지질함량과같은영양성분조성만 으로실험어의성장생존율차이에원인을판단하기는어렵

. Lee et al. (2000a)

동일한사료조성으로수분함량만

10.2

36.1%

각기다른사료로조피볼락을사육한결과실험어

생존율

,

성장도사료효율에차이가없는것으로보고한 있어

,

연구결과의이러한차이의대해서는금후사료중의 수분함량사료형태에따른장기사육실험들을통한상세한 연구가수행될필요가있을것으로사료된다

.

연구에서사료효율은

MP

실험구가

62%

였으며

, SEP

험구와

EP

실험구는각각

41%

38%

, MP

실험구가

SEP

EP

실험구에비하여높은결과를보였다

.

이와유사하게 상수조에서조피볼락을

11

개월간사육한기존의연구

(Lee et

al. 1995b)

에서배합사료와생사료실험구의사료효율은각각

71%

91%

였다

.

그리고

Lee and Jeon (1996b)

실험배합 사료

,

시판배합사료습사료를공급하며육상수조에서조피 볼락사육효과를비교한연구에서도사료효율은실험배합사 공급구가

63-79%,

시판배합사료공급구가

54-83%,

습사 공급구가

101%

나타나

, MP

실험구가

EP

실험구에비하 높은사료효율을보였다

.

이와같이

MP

실험구의높은사료 효율또한

MP

사료의영양소단백질과지질함량이

EP

SEP

사료에비하여현저히높기때문으로판단된다

.

또한육상

수조에서수행된기존의연구들

(Lee et al. 1995b; Lee and Jeon

1996b)

비교하여연구에서의사료효율은다소낮은결과

보였는데

,

이와같이사료효율이감소한것은어체크기

,

품질사육수온과같은실험조건의차이를배제할수는

지만

,

연구에사용된가두리의깊이가

7 m

점을감안하여

가두리에공급된침강형태의배합사료육안으로관찰 불가능한사료유실에영향을받았을것으로판단된다

.

사육실험 종료

,

실험어 전어체의 일반성분 분석결과를

Table 3

나타내었다

.

전어체의조단백질함량은

EP

SEP

실험구가

MP

비하여다소높은값을보였으나

,

조지질함량

MP

실험구가

EP

SEP

실험구에비하여높은결과를보였

.

수분회분함량은실험구간에차이가없었다

.

어체 지질함량은양식어의품질에영향을미칠있으며

,

사료내 지질함량증가에따른어체내과잉의지질축적은양식어의 질을떨어뜨릴있다

(Hillestad and Jonhsen 1994).

전어체의 지방산 분석결과를

Table 4

나타내었다

.

모든 실험구에서 어체의 지방산

C16:0, C18:1n-9, C20:5n-3

C22:6n-3

가장많은함량을차지하고있었다

.

실험사료

따른어체의지방산들은차이를보이지는않았으나

, C18:2n-6

EP

SEP

실험구가

MP

실험구에 비하여현저 하게높은결과를보였다

.

이는실험사료중에함유되어있는

C18:2n-6

함량의차이에의한것으로판단된다

.

일반적으로

체의지방산조성에사료지질의지방산조성에영향을받는 으로알려져있으며

(Kim et al. 2002; Kim and Lee 2004),

조피 볼락을대상으로기존의연구에서도연구와유사한결과 보고되었다

(Lee et al. 2000b).

Table 3. Proximate composition of whole body in Korean rockfish Sebastes schlegeli fed the experimental diets

Diets

EP SEP MP

Moisture (%) 65.8 64.8 64.8

Crude protein (%) 17.9 18.1 17.3

Crude lipid (%) 12.7 12.8 14.0

Ash (%) 4.5 4.4 3.8

EP; extruded pellet, SEP; Soft extruded pellet, MP; raw fish-based moist pellet.

Table 4. Fatty acids composition (% of total fatty acids) of whole body in Korean rockfish Sebastes schlegeli fed the experimental diets

Fatty acids Diets

EP SEP MP

C14:0 2.7 3.0 2.8

C16:0 19.3 18.4 18.5

C16:1n-7 6.2 6.5 6.7

C17:0 0.8 0.8 0.8

C18:0 5.1 4.5 4.7

C18:1n-9 20.4 23.3 23.6

C18:2n-6 6.8 8.0 2.8

C18:3n-3 0.9 1.1 0.8

C20:1n-9 1.3 0.9 1.0

C20:3n-6 0.2 0.3 0.1

C20:3n-3

1.6 2.0 2.0

C20:4n-6

0.4 0.5 0.5

C20:5n-3

11.7 8.4 9.2

C22:3n-3

0.3 0.3 0.5

C22:5n-3

3.2 2.8 2.4

C22:6n-3

19.0 19.2 23.7

EP; extruded pellet, SEP; Soft extruded pellet, MP; raw fish-based moist pellet.

(5)

사료종류별어체등근육의관능평가결과를

Table 5

나타 내었다

.

등근육의냄새

,

색택

,

질감평가결과는사료종류 따른차이를보이지않았으며

,

전반적인기호도역시평가자 평균값이

6

(

조금좋다

)

7

(

좋다

)

사이로나타났으며

,

험구간에통계적인차이를보이지않았다

.

어체등근육의물성 측정결과

,

사료종류별로등근육의탄력성

,

검성

,

경도강도 유의한차이가없어

, EP, SEP

MP

공급에따른조피볼락

어체물성에는차이가없는것으로판단된다

(Table 6).

이와같이연구에서

EP

SEP

실험구의성장도가

MP

비하여다소낮기는하였으나

,

사료별로사육된조피볼락의 어체품질은차이가없었으므로배합사료의단백질에너지 함량등을조절하여사료품질을향상시킨다면충분히생사료 효능과유사한배합사료제조가가능할것으로판단된다

.

사 사

연구는국립수산과학원

(

친환경실용배합사료개발품질 관리연구

, RP-2013-AQ-111)

지원에의해운영되었습니다

.

참고문헌

Folch J, Lees M and Sloane-Stanley GH. 1957. A simple method for the isolation and purification of total lipids from animal tissues. J Biol Chem 226, 497-509.

Hillestad M and Jonhsen FT. 1994. High-energy/low-protein di- ets for Atlantic salmon: effects on growth, nutrient retention and slaughter quality. Aquaculture 124, 109-116.

Kim KD and Lee SM. 2004. Requirement of dietary n-3 highly unsaturated fatty acids for juvenile flounder (

Paralichthys olivaceus

). Aquaculture 229, 315-323.

Kim KD, Lee SM, Park HG, Bai SC and Lee YH. 2002. Essenti- ality of dietary n-3 highly unsaturated fatty acids in juvenile Japanese flounder (

Paralichthys olivaceus

). J World Aqua- cult Soc 33, 432-440.

Kim KD, Kang YJ, Lee JY, Kim KW, Lee HY, Kim KM and Lee SM. 2008. Evaluation of extruded pellets for grower Ko- rean rockfish

Sebastes schlegeli

. J Aquaculture 21, 107-110.

Kim KD, Kang YJ, Lee HY, Kim KW, Jang MS, Kim SK and Son MH. 2009. Evaluation of extruded pellets containing dif- ferent protein and lipid levels, and raw fish-based moist pellet for growth of flounder (

Paralichthys olivaceus

). Kor J Fish Aquat Sci 42, 476-480.

Lee SM. 2002. Apparent digestibility coefficients of various feed ingredients for juvenile and grower rockfish (

Sebastes schlegeli

). Aquaculture 207, 79-95.

Lee SM and Jeon IG. 1996a. Evaluation of dry pellet on growth of juvenile Korean rockfish (

Sebastes schlegeli

) by compar- ing with moist pellet and raw fish based moist pellet. J Aqua- culture 9, 247-254.

Lee SM and Jeon IG. 1996b. Evaluation of experimental formu- lated diets and commercial diets for growing Korean rockfish (

Sebastes schlegeli

). J Aquaculture 9, 377-384.

Lee SM and Kim KD. 2009. Effects of dietary carbohydrate to lipid ratios on growth and body composition of juvenile and grower rockfish,

Sebastes schlegeli

. Aquacult Res 40, 1830- 1837.

Lee JY, Kang YJ, Lee SM and Kim IB. 1993. Protein require- ments of the Korean rockfish

Sebastes schlegeli

. J Aquacul- ture 6, 13-17.

Lee SM, Lee JY and Jeon IG. 1995a. Growth pattern of Korean rockfish (

Sebastes schlegeli

) from the indoor culture system.

J Aquaculture 8, 221-229.

Lee JY, Lee SM and Jeon IG. 1995b. Effect of a practical Korean rockfish (

Sebastes schlegeli

) diet ; Comparison with raw fish and moist pellet diet. J Aquaculture 8, 261-269.

Lee SM, Hwang UG and Cho SH. 2000a. Effect of feeding fre- quency and dietary moisture content on growth, body com- position and gastric evacuation of juvenile Korean rockfish (

Sebastes schlegeli

). Aquaculture 187, 399-409.

Lee SM, Lee JY and Jeon IG. 2000b. Dietary squid liver oil and soybean oil ratio on growth and body composition of Korean rockfish

Sebastes schlegeli

. J Aquaculture 13, 207-213.

Lee SM, Seo JY, Lee YW, Kim KD, Lee JH and Jang HS. 2005.

Evaluation of experimental extruded pellet, commercial pel- let and raw fish-based moist pellet for growing flounder,

Paralichthys olivaceus

, J Aquaculture 18, 287-297.

Table 5. Sensory scores of dorsal muscle in Korean rockfish Se- bastes schlegeli fed the experimental diets

Diets Pooled

SEM1

EP SEP MP

Flavor 5.8 5.9 6.0 0.17

Color 6.4 6.2 6.3 0.14

Taste 6.8 6.5 6.3 0.16

Texture 6.6 6.3 6.0 0.16

Overall acceptability 6.6 6.9 6.3 0.15

1Pooled standard error of means: SD/√n.

EP; extruded pellet, SEP; Soft extruded pellet, MP; raw fish-based moist pellet.

Table 6. Textural properties of dorsal muscle in Korean rockfish Sebastes schlegeli fed the experimental diets

Diets

EP SEP MP

Springiness (%) 83±1.4ns 82±2.6 82±0.9 Gumminess (g) 228±11.3ns 247±29.7 259±11.0 Hardness (g/cm2) 232±12.3ns 257±35.5 266±13.9 Strength (g/cm2) 180±9.3ns 201±28.5 207±10.8

ns ; Not significant (P>0.05).

EP; extruded pellet, SEP; Soft extruded pellet, MP; raw fish-based moist pellet.

수치

Table 1. Nutrient contents of the experimental diet Diets
Table 2. Growth performance of Korean rockfish Sebastes schlege- schlege-li fed the experimental diets
Table 3. Proximate composition of whole body in Korean rockfish  Sebastes schlegeli fed the experimental diets
Table 6. Textural properties of dorsal muscle in Korean rockfish  Sebastes schlegeli fed the experimental diets

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