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Alterations of Hematological Parameters, Plasma Constituents and Antioxidant Responses in the Sablefish Anoplopoma fimbria Depending on Salinity

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Copyright © 2016 The Korean Society of Fisheries and Aquatic Science pISSN:0374-8111, eISSN:2287-8815

서 론

해산어류에게염분은가장중요한환경요인하나이며

,

분의변화는어류체내의다양한영향을일으킬있다

.

해산어 류에게낮은염분은이온과수분평형에혼란을일으키고

,

삼투 조절에영향을미쳐어류의생리적변화로인한스트레스를 래한다

(Kim et al., 2004).

그리고염분은어류의부력에영향 미치는요인으로어류의난의수직운동에도영향을미친다

(Sclafani et al., 1993).

또한염분농도는염분에따른중금속

(Ag)

형태를전환시킴으로써생체이용률에영향을주어

(Ag)

생물축적에도밀접한관계를가진다

(Webb and Wood,

2000).

염분에대한내성은어종마다차이가다양하게나타나

는데

,

초기성장기에많은영향을받는다

(Panfill et al., 2006).

어류의염분변화에따른노출광염성어류

,

혐염성어류에 따라차이는있지만

,

일반적으로성장지연생리적으로부정

영향을미치는스트레스요인으로작용한다

(Partridge and

Jenkins, 2002).

어류의혈액학적성상은외부환경적변화에따른대사작용 건강상태를확인하기위한지표로많이사용되고있다

(Kim and Kang, 2014).

그리고생태생리학적반응으로적혈구

염분농도에 따른 치어기 은대구(Anoplopoma fimbria)의 혈액학적 성상, 혈장성분 및 항산화반응의 변화

김준환·박희주·황인기·김도형·오철웅

1

·이정식

2

·강주찬*

부경대학교 수산생명의학과, 1부경대학교 자원생물학과, 2전남대학교 수산생명의학과

Alterations of Hematological Parameters, Plasma Constituents and An- tioxidant Responses in the Sablefish Anoplopoma fimbria Depending on

Salinity

Jun-Hwan Kim, Hee-Ju Park, In-Ki Hwang, Do-Hyung Kim, Chul Woong Oh

1

, Jung sick Lee

2

and Ju-Chan Kang*

Department of Aquatic Life Medicine, Pukyong National University, Busan 48513, Korea

1

Department of Marine Biology, Pukyong National University, Busan 48513, Korea

2

Department of Aqualife Medicine, Chonnam National University, Yeosu 59626, Korea

Juvenile Anoplopoma fimbria (mean length 15.6±1.4 cm, mean weight 68.7±4.3 g) were exposed to 4 months with the different levels of salinity [100 (35.0), 90 (31.5), 80 (28.0), 70 (24.5), 60 (21.0), 50 (17.5), and 40 (14.0) % (psu)]

for 4 months. Hematological parameters such as red blood cell (RBC) counts, hematocrit (Ht), and hemoglobin (Hb) concentrations were substantially decreased under salinities of 50% psu or lower. Of the measured inorganic plasma constituents, magnesium was notably decreased, whereas there was no effect on calcium. Among organic plasma components, glucose and cholesterol were significantly increased, and total protein was decreased. Among enzyme plasma components, glutamic oxalate transaminase (GOT), glutamic pyruvate transaminase (GPT), and alkaline phosphatase (ALP) were significantly increased under salinities of 50% psu or lower. Antioxidant responses such as glutathione S-transferase (GST) and glutathione (GSH) were significantly decreased at salinities of 50% psu or lower.

The results of this study indicate that salinity affects the blood parameters, plasma constituents, and antioxidant re- sponses of A. fimbria .

Key words: Anoplopoma fimbria , salinity, hematological parameters, plasma components

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.2016.0830 Korean J Fish Aquat Sci 49(6) 830-837, December 2016

Received 19 August 2016; Revised 6 October 2016; Accepted 19 October 2016

*Corresponding author: Tel: +82. 51. 629. 5944 Fax: +82. 51. 629. 5938

E-mail address: [email protected]

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염분농도가 은대구에 미치는 영향

831

,

호르몬

, hematocrit, hemoglobin

농도

,

백혈구수와같은 양한혈액성분의변화가일어난다

(Zarejabad et al., 2010).

혈액 내의혈장성분역시염분변화에따른어류의스트레스를평가

하고건강상태를판단하는주요한지표로판단된다

(Arnason

et al., 2013).

하지만

,

다른환경적요인에따른영향에비해 분에대한연구는많이수행되어있지않다

.

염분이해산어류에 미치는가장주요한환경요인하나임을고려해보았을

,

분농도에따른영향에대한연구가필요할것으로판단된다

.

어류에서염분의변화는생리적인스트레스를유발함으로써

,

활성산소를생성하게된다

(Yin et al., 2011).

어류에서활성산 생성에따른방어작용으로항산화반응을나타내게되는데

, GST

대표적인항산화반응하나이다

. GST

이차해독효 대표적인항산화효소로작용을하며

,

어류에서산화스트 레스에따른산화손상을평가하는지표로많이사용되고있다

(Regoli and Principato, 1995). GSH

역시활성산소를물과 소로전환시킴으로써항산화작용을하는대표적인물질 나이다

(Kim and Kang, 2016a).

이러한항산화물질의중요성 고려해보았을

, GST

활성과

GSH

수준과같은항산화반응 염분변화에따른항산화영향을평가하는좋은지표가 이다

.

실험에사용된은대구는미국캐나다에서양식되고 고부가가치를지닌한해성어종으로

,

높은상품성을지니고 있는어종이다

.

하지만

,

우리나라에서는현재까지양식이이루 어지고있지않다

.

따라서실험의목적은은대구완전양식을 위한실험의일환으로

,

치어기와성어기의생육환경이상이하 다양한염분농도로이동하는생활사에서적정염분농도 염분에대한내성을확인하기위해염분농도에따른성장

,

혈액 성상혈장성분의변화를확인하는데있다

.

재료 및 방법

실험어 및 실험환경

실험에 사용한 실험어는 미국

Troutlodge

사에서 분양

받은 은대구치어를실험어 크기

(

전장

15.6±1.4 cm,

체중

68.7±4.3 g)

성장시킨

,

실험에사용할외관상건강한개체

175

마리선별하였다

.

실험사육수온은해수냉각장치를

이용하여

13±1°C

일정하게유지하였다

.

실험염분농도는

해수

35 psu

100%

보고

100 (35.0 psu), 90 (31.5 psu), 80 (28.0 psu), 70 (24.5 psu), 60 21.0 psu), 50 (17.5 psu), and 40 (14.0 psu)%

염분농도구간을두어염분에따른변화를

4

실시하였으며

, 2

간격으로혈액학적변동을검토하였다

. 혈액성상

실험어는혈액응고를방지하기위해헤파린을처리한

1

회용 주사기를사용하여미부정맥에서채취하였다

.

채혈한혈액으

RBC (Red Blood Cell) count, hemoglobin (Hb)

농도

hematocrit (Ht)

즉시분석하였다

. RBC count

Hendrick`s diluting soluton

으로혈액을

400

희석

, hemo-cytometer (Improved Neubauer, Germany)

이용하여광학현미경으로 계수다시희석배수를곱하여계산하였다

. Ht

Ht

모세관 내로혈액을넣어

, microhematocrit centrifuge(Model; 01501, HAWKSLEY AND SONS Ltd., England)

에서

12,000 rpm, 5

분간원심분리판독판

(Micro-Haematocrit reader, HAWK- SLEY AND SONS Ltd., England)

으로측정하였다

. Hb

농도 임상용

kit (Asan Pharm. Co., Ltd.)

이용하여

Cyan-met- hemoglobin

(Azim et al., 2002)

으로

540 nm

에서측정하였

.

혈장분석을위해채취한혈액은

4°C, 3,000 g

5

분간원심 분리하였다

.

분리한혈장으로무기성분

,

유기성분

,

효소활성의 변화를분석하였다

.

무기성분으로는칼슘

(Calcium),

마그네슘

(Magnesium)

측정하였다

.

칼슘은

OCPC

(Connerty and Briggs, 1966)

의해

570 nm

에서

,

마그네슘은

Xylidyl blue- I

(Kannan et al., 2015)

의해

515 nm

에서시판되고있는 상용

kit (Asan Pharm. Co., Ltd)

이용하여측정하였다

.

유기성분으로는 글루코즈

(Glucose),

콜레스테롤

(Cholester- ol),

총단백질

(Total protein)

측정하였다

.

글루코즈는

GOD/

POD

(Raabo and Terkildsen, 1960)

의해

500 nm

에서

,

레스테롤은효소법

(Allain et al., 1974)

의해

500 nm

에서

,

단백질은

Biuret

(Lubran, 1978)

의해

540 nm

에서각각 판되고있는임상용

kit (Asan Pharm. Co., Ltd)

이용하여 석하였다

.

혈장 효소활성으로는

GOT (Glutamic oxalate trans- minase), GPT (Glutamic pyruvate transminase), ALP (Alka- line phosphatase)

측정하였다

. GOT

GPT

505 nm

에서

Reitman-Frankel

(Hollands and Logan, 1966), ALP King- King

(King and King, 1954)

의해

500 nm

에서시판되고 있는임상용

kit (Asan Pharm. Co., Ltd)

이용하여분석하였

.

항산화반응

간과아가미의항산화반응을측정하기위해

washing buffer (0.1 M KCl, pH 7.4)

세척

, homogenizing buffer (0.1 M PBS, pH 7.4)

Teflon-glass homogenizer

이용하여균질화 하였다

.

균질화한

4°C, 10,000 g

60

분간원심분리하여 등액을실험에사용하였다

.

GST

활성은

Habig (1974)

방법을이용하여측정하였다

.

정량의시료에

0.2 M potassium phosphate (pH 6.5)

증류수 첨가

,

혼합시킨

10 mM GSH

10 mM CDNB

첨가하 실온에서

1

분간반응시켰다

.

반응분광광도계를이용하

340 nm

에서

30

단위로

5

분간측정하여

nmol/ min/ mg protein

으로표시하였다

.

GSH

수준은

Beutler (1984)

방법을이용하였다

.

상등액에

(3)

precipitation solution (metaphosphoric acid, Na

2

EDTA, NaCl)

첨가하여혼합

, 4,500 g

10

분간원심분리 하였다

.

등액에

0.3 M Na

2

HPO

4넣고

, 0.5 nM DTNB

발색시켜 분광광도계로

412 nm

에서흡광도를측정하였다

. GSH

함량은

reduced glutathione standard curve

이용하여 측정하였고

, nmol GSH/ mg protein

으로표시하였다

.

유의성 검정

실험분석결과에대한통계학적유의성은

SPSS

통계프로

그램

(SPSS Inc.)

이용하여

ANOVA test

실시하여

Tukey’s multiple range test

통해

P<0.05

유의성이있는것으로 간주하였다

.

결 과

혈액성상분석

염분농도에따른은대구의혈액성상변화는

Table 1

나타 내었다

. RBC

수치는실험

2

달과

4

50%

염분농도에서 유의적인 감소를 나타내었다

(P<0.05). Hematocrit

실험

2

60%

이하의염분농도에서유의적감소를나타내었고

,

실험

4

50%

염분농도에서유의적감소를나타내었다

(P<0.05). Hemoglobin

실험

2

달과

4

50%

염분농도 에서유의적인감소가나타났다

(P<0.05).

혈장성분 분석

혈장성분변화무기성분변화는

Table 2

나타내었다

.

장무기성분칼슘은염분농도에의한유의적변화는나타나 않았다

.

혈장무기성분마그네슘은실험

4

50%

분농도에서유의적감소를나타내었다

(P<0.05).

혈장성분변화 유기성분의변화는

Table 3

나타내었다

.

글루코즈는실험

2

50%

염분농도에서유의적증가를나타내었으며

,

4

60%

이하의염분농도에서유의적증가를나타내었

(P<0.05).

콜레스테롤은실험

2

유의적변화를나타내지 않았지만

,

실험

4

50%

염분농도에서유의적증가를 타내었다

(P<0.05).

반면총단백질은실험

2

달과

4

60%

하의염분농도에서유의적감소를나타내었다

(P<0.05).

혈장성 분변화효소성분의변화는

Table 4

나타내었다

.

혈장

GOT

실험

2

50%

염분농도에서유의적으로증가하였고

,

실험

4

60%

이하의염분농도에서유의적으로증가하였

(P<0.05). GPT

실험

2

달과

4

50%

염분농도에서 유의적증가를나타내었다

(P<0.05). ALP

역시실험

2

달과

4

50%

염분농도에서유의적증가를나타내었다

(P<0.05).

항산화반응

염분농도에따른

GST

활성의변화는

Fig. 1

나타내었다

.

간과아가미조직의

GST

활성은노출

2

달과

4

50%

분농도에서유의적으로감소하였다

(P<0.05).

염분농도에따른

Table 2. Changes of inorganic plasma components in sablefish Anoplopoma fimbria exposed to the different levels of salinity for 4 months Parameters Period

(month) Salinity (%)

100 90 80 70 60 50

Calcium

(mg/dL) 2 1.75±0.20a 1.73±0.21a 1.74±0.19a 1.73±0.27a 1.67±0.18a 1.70±0.17a 4 1.74±0.18a 1.76±0.20a 1.73±0.20a 1.75±0.25a 1.72±0.25a 1.70±0.18a Magnesium

(mg/dL) 2 3.33±0.29a 3.32±0.31a 3.38±0.34a 3.30±0.38a 3.29±0.23a 3.25±0.32a 4 3.32±0.32a 3.37±0.24a 3.42±0.33a 3.29±0.19a 2.95±0.37ab 1.97±0.25b Values are mean±S.E. Values with different superscript are significantly different at 2 months and 4 months (P<0.05) as determined by Tukey's multiple range test.

Table 1. Changes of RBC (red blood cell) count, Hematocrit and Hemoglobin in sablefish Anoplopoma fimbria exposed to the different levels of salinity for 4 months

Parameters Period (month)

Salinity (%)

100 90 80 70 60 50

RBC count

(×104mm3) 2 340.5±32.8a 335.1±31.5a 337.5±32.8a 341.9±40.9a 328.7±35.5a 260.9±29.8b 4 335.6±32.5a 336.7±34.0a 331.4±26.5a 340.8±35.0a 297.5±31.8ab 235.2±34.5b Hematocrit

(%) 2 42.3±4.1a 41.5±4.0a 41.9±4.2a 42.1±3.6a 37.7±3.9b 35.4±3.2b

4 41.3±3.9a 40.5±3.8a 41.6±4.4a 31.6±4.3b 36.4±4.2ab 29.6±2.9b Hemoglobin

(g/dL) 2 11.8±1.3a 11.6±1.2a 10.65±1.3ab 11.7±1.3a 10.6±1.1ab 9.1±1.2b

4 11.6±1.2a 11.42±1.5a 11.59±1.1a 8.6±1.2b 10.2±1.2ab 8.4±1.0b Values are mean±S.E. Values with different superscript are significantly different at 2 months and 4 months (P<0.05) as determined by Tukey's multiple range test.

(4)

염분농도가 은대구에 미치는 영향

833

GSH

수준의변화는

Fig. 2

나타내었다

.

조직의

GSH

수준 노출

2

달과

4

50%

염분농도에서유의적으로감소를 나타내었고

,

아가미조직의

GSH

수준역시노출

2

달과

4

50%

염분농도에서유의적으로감소하였다

(P<0.05).

고 찰

어류에서염분변화에따른노출은어류의삼투압조절에 요한체내이온평형에문제를일으키고

(Mccormick, 2001),

발달에사용할에너지를체내의항상성유지에소모함으 Fig. 1. Changes of GST (glutathione S-transferase) activity in liver and gill of sablefish, Anoplopoma fimbria exposed to the different levels of salinity for 4 months. Vertical bar denotes a standard error. Values with different superscript are significantly different at 2 months and 4 months (P<0.05) as determined by Tukey's multiple range test.

Months

2 4

G ST (n m ol/ m in /m g pro te in)

0.000 0.001 0.002 0.003 0.004 0.005

a a a a

ab b a a a

ab b

Liver

ND ND

ab 100 %

90 % 80 % 70 % 60 % 50 % 40 %

Months

2 4

G ST (n m ol/ m in /m g pro te in)

0.000 0.001 0.002 0.003 0.004

0.005 100 %

90 % 80 % 70 % 60 % 50 % 40 %

a a a a

b a a

ab b

ND ND

Gill

ab abab

Months

2 4

G SH (n m ol G SH /m g pro te in)

0.000 0.005 0.010 0.015 0.020 0.025 0.030

100 % 90 % 80 % 70 % 60 % 50 % 40 %

a a a a b

a a aab b

ND ND

Liver

ab ab

Months

2 4

G SH (n m ol G SH /m g pro te in)

0.00 0.01 0.02 0.03 0.04 0.05

0.06 100 %

90 % 80 % 70 % 60 % 50 % 40 % aa a

ab b

a a a b

ND ND

Gill

ab abab

Table 3. Changes of organic plasma components in sablefish Anoplopoma fimbria exposed to the different levels of salinity for 4 months Parameters Period

(month) Salinity (%)

100 90 80 70 60 50

Glucose

(mg/dL) 2 93.5±8.6a 96.4±10.2a 95.15±8.7a 115.4±9.1b 104.9±10.2ab 120.33±10.1b 4 94.2±9.3a 95.8±8.3a 96.7±9.5a 108.5±10.8ab 121.9±12.1b 126.4±13.5b Cholesterol

(mg/dL) 2 142.3±14.8a 143.8±14.6a 141.2±14.6a 145.9±15.4a 151.3±16.2a 158.0±17.3a 4 143.5±15.6a 144.2±15.2a 142.6±15.1a 147.3±15.6a 162.4±16.4ab 185.4±18.4b Total protein

(g/dL) 2 4.15±0.44a 4.10±0.43a 4.02±0.36a 3.80±0.44ab 3.31±0.51b 3.22±0.36b 4 4.12±0.36a 4.08±0.40a 3.81±0.51ab 3.75±0.38ab 3.15±0.42b 2.98±0.28b Values are mean±S.E. Values with different superscript are significantly different at 2 months and 4 months (P<0.05) as determined by Tukey's multiple range test.

Table 4. Changes of enzymatic plasma components in sablefish Anoplopoma fimbria exposed to the different levels of salinity for 4 months Parameters Period

(month) Salinity (%)

100 90 80 70 60 50

GOT(karmen unit)

2 2.37±0.28a 2.33±0.26a 2.38±0.29a 2.36±0.25a 2.59±0.26ab 2.96±0.42b 4 2.33±0.24a 2.27±0.22a 2.37±0.32a 2.45±0.29a 3.23±0.33b 3.40±0.27b GPT(karmen unit) 2 1.65±0.17a 1.63±0.16a 1.64±0.22a 1.58±0.16a 1.82±0.15ab 1.95±0.27b 4 1.71±0.17a 1.62±0.32a 1.58±0.17a 1.98±0.27b 1.88±0.26ab 2.01±0.21b ALP(K-A) 2 5.54±0.61a 5.32±0.57a 5.63±0.47a 5.61±0.38ab 6.26±0.58ab 6.90±0.47b 4 5.60±0.53a 5.39±0.54a 5.70±0.61a 6.34±0.61ab 6.42±0.65ab 7.32±0.68b Values are mean±S.E. Values with different superscript are significantly different at 2 months and 4 months (P<0.05) as determined by Tukey's multiple range test. GOT, glutamic oxalate transminase; GPT, glutamic pyruvate transminase; ALP, alkaline phosphatase.

(5)

김준환

박희주

황인기

김도형

오철웅

이정식

강주찬

834

로써성장지연질병에대한저항력을감소시킨다

(Kim et al., 2009; Xiu-mei and Wen-tao, 2005). Saoud et al. (2007)

적정삼투압이하의염분농도는해산어류의성장에영향을 있음을보고한있으며

,

실험에서

40% psu (17.5 ppt)

하의저염분은

rabbitfish

성장을둔화시켰다

.

RBC

수치

, hematocrit,

그리고

hemoglobin

같은혈액학적 지표는외부스트레스영향에의한생리적반응을판단하는 표로많이사용된다

(Kim and Kang, 2016b; Roche and Boge,

1996).

실험에서 저염분농도에서의은대구노출은유의적

혈액학적성상의감소를나타내었다

. Pufferfish

에서저염분 으로갈수록

RBC count

hematocrit

수치가유의적으로 소가보고된있다

(Lee and Huh, 2004). Hematocrit

어류 빈혈과종합적인건강상태를판단하는주요한지표로환경 염분농도에많은영향을받으며

,

저염분에 노출된

cobia

에게

hematocrit

유의적감소를보고한있다

(Denson et al., 2003). Shirangi et al. (2016)

저염분농도에노출된

Persian sturgeon

에서낮은

hematocrit

값을보고했으며

,

이는감소 삼투조절요구에따른조직산소요구량의감소에의한것으 판단된다

. Tavares-Dias et al. (2000)

hemoglobin

농도는

hematocrit

비율과비례해서높은상관관계가있음을발견하였

,

감소된

hemoglobin

농도는서식환경의염분농도저하시 타나는

hematocrit

비율변화

적혈구순환저하의영향에 것으로보고한있다

.

어종에따른이온농도의조절능력차이는서식지의염분변화 종에따라스트레스요인으로작용할있으며

,

혈액의 양한성분에영향을미친다

(Arnason et al., 2013; Imsland et

al., 2008).

혈장무기성분인칼슘과마그네슘은항상성을유지

하기위해이온조절기능을하기때문에

,

환경변화에따른영향 판단하는지표로많이이용되고있다

(Bijvelds et al., 1998).

실험에서염분농도에따른은대구혈장칼슘성분의변화는 나타나지않았지만

,

혈장마그네슘성분은유의적감소를나타 내어

,

저염분이은대구혈장의이온조절에도영향을미치고 음을확인하였다

.

염분저하에따른마그네슘의주요기능인 경자극의전달근이완의저하는성장둔화를유발할

(Bolton et al., 1987).

염분의변화에따른삼투압조절에서 문제가생기면뇌하수체아세틸콜린의분비를초래하며

,

부신피질에서의콜티졸분비를촉진시킨다

.

분비된콜티졸 염류세포의능동수송에의한작용을증대시키고혈당이용 억제함으로써

,

혈중글루코즈의농도를증가시킨다

(Oh et al., 2014).

실험에서저염분의노출은은대구의혈장글루코 즈를유의적으로증가시켰다

. Tsuzuki et al. (2001)

역시낮은 농도의염분노출이

pejerrey

스트레스를유발하여

,

스트레스 따른글루코즈의변화를보고한있다

.

콜레스테롤은 포막필수구조성분이며

,

스테로이드호르몬전구체이다

.

콜레 스테롤의증가는간과신장기능의실패로혈액으로콜레스테 롤의분비에따른결과로판단된다

.

따라서콜레스테롤의증가 환경적스트레스를판단하는주요한지표로이용된다

(Oner et al., 2008).

실험에서낮은염분의노출은은대구의콜레스 테롤수치를유의적으로증가시켰다

. Jave and Usmani

역시 염된환경에노출된

Channa punctatus

에서증가된콜레스테롤 수치를보고한있다

.

총단백질은수분평형과영양상태를 단하는유용한지표이며

,

환경적염분농도에따라민감하게 응한다

(Chang and Hur, 1999).

실험에서저염분노출에 은대구의혈장단백질은유의적으로감소하였다

. Lee and Huh (2004)

pufferfish

총단백질이저염분노출에의해 의적으로변화였다고보고한있다

.

혈장효소성분에서

GOT,

GPT,

그리고

ALP

환경변화에따른조직손상영향을

판단하는 지표로많이사용되고 있다

(Kim and Kang, 2015).

Fig. 2. Changes of GSH (glutathione) level in liver and gill of sablefish, Anoplopoma fimbria exposed to the different levels of salinity for 4 months. Vertical bar denotes a standard error. Values with different superscript are significantly different at 2 months and 4 months (P<0.05) as determined by Tukey's multiple range test.

Months

2 4

G ST (n m ol/ m in /m g pro

0.000 0.001 0.002 0.003

a a a a

ab b a a a

ab b

ND ND

ab 50 %

40 %

Months

2 4

G ST (n m ol/ m in /m g pro

0.000 0.001 0.002 0.003

50 % 40 %

a a a a

b a a

ab b

ND ND

ab abab

Months

2 4

G SH (n m ol G SH /m g pro te in)

0.000 0.005 0.010 0.015 0.020 0.025 0.030

100 % 90 % 80 % 70 % 60 % 50 % 40 %

a a a a b

a a aab b

ND ND

Liver

ab ab

Months

2 4

G SH (n m ol G SH /m g pro te in)

0.00 0.01 0.02 0.03 0.04 0.05

0.06 100 %

90 % 80 % 70 % 60 % 50 % 40 % aa a

ab b

a a a b

ND ND

Gill

ab abab

(6)

염분농도가 은대구에 미치는 영향

835

실험에서은대구의혈장

GOT, GPT,

그리고

ALP

낮은 분농도의노출에의해유의적으로증가를나타냈다

.

이와유사 하게낮은염분농도에노출된

rockfish

혈장

GOT

에서도 의적인증가가나타났다

(Oh et al., 2014). Wickee and Morgan (1976)

역시염분농도에따른

American oyster

GOT

값의 의적변화를보고하였다

. Fazio et al. (2013)

염분농도에

mullet

유의적인

GOT

GPT

변화를보고하기도하였

. Joseph and Philip(2007)

역시낮은농도의염분노출은

gi- ant tiger prawn

에서염분스트레스를유발하여

ALP

같은 액학적성상을변화시켰다고보고하였다

.

실험에서저염분 농도에노출된은대구혈장성분의변화는염분의변화가은대 구의혈장성상에도많은영향을미치고있음을보여주고있다

.

어류에게염분의변화는활성산소를생성함으로써

,

산화스트 레스로작용할있다

(Lushchak, 2011).

실험에서저염분농 도에노출된은대구의

GST

활성과

GSH

수준은유의적으로 소하였다

. Ruiz and Blumwald (2002)

GSH

합성은염분스 트레스에의해유발된산화스트레스로인한영향을받을 다고보고한있다

. Donham et al. (2006)

염분농도에의해

white sturgeon

Chinook salmon

에서

GST

수준이유의적으 변화했음을보고한있다

.

그리고많은연구자들은염분이 수중생물의

GST

활성에영향을미친다고보고한있다

(Lau et al., 2004; Cailleaud et al., 2007).

이와같이

,

염분의변화는 산화스트레스를유발하며

,

실험에서은대구

GST

GSH

같은항산화반응의지표의유의적변화는저염분농도에서산화 스트레스에따른영향을받았을것으로판단된다

.

염분의노출에따른은대구의성장혈액학적성상변화 대한결과는장기간의염분노출이은대구의성장생리 변화에상당한영향을주었으며

,

그리고이러한변화에따른 스트레스또는항상성유지를위한많은에너지를소모했을 으로판단된다

.

실험의결과치어기의은대구에서염분농도

60%

이하의노출은은대구에상당한영향을미칠것이며

,

향후

은대구양식에서저염분노출에따른영향을판단할있는 준이마련되어야것이다

.

사 사

논문은

2016

해양수산부재원으로한국해양과학기술진

흥원의지원을받아수행된연구임

(

은대구인공종묘생산실용 기술개발

).

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수치

Table 2. Changes of inorganic plasma components in sablefish Anoplopoma fimbria exposed to the different levels of salinity for 4 months Parameters Period (month) Salinity (%) 100 90 80 70 60 50 Calcium (mg/dL) 2 1.75±0.20 a 1.73±0.21 a 1.74±0.19 a 1.73±0.
Table 3. Changes of organic plasma components in sablefish Anoplopoma fimbria exposed to the different levels of salinity for 4 months Parameters Period (month) Salinity (%) 100 90 80 70 60 50 Glucose (mg/dL) 2 93.5±8.6 a 96.4±10.2 a 95.15±8.7 a 115.4±9.1
Fig. 2. Changes of GSH (glutathione) level in liver and gill of sablefish, Anoplopoma fimbria exposed to the different levels of salinity for 4  months

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