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RISS 인기검색어
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- 저자 : 최낙중 ( Nack Jung Choi ) (검색결과 4 건)
- 무료
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피조개의 생존과 대사에 미치는 수온, 염분 및 저산소의 영향
신윤경,김병학,최낙중,정춘구,박민우,Shin, Yun-Kyung,Kim, Byoung-Hak,Choi, Nack-Joong,Jung, Choon-Goo,Park, Min-Woo 한국패류학회 2008 The Korean Journal of Malacology Vol.24 No.1
본 연구는 피조개의 용존산소에 대한 내성을 구명하기 위하여 경남 진해만에 서식하는 피조개를 대상으로 수온과 염분에 대한 용존산소 농도별 생존율, 산소소비율 및 외부 형태 변화 등을 조사하였다. 피조개의 용존산소에 대한 $LC_{50}$은 수온 $15^{\circ}C$-일반해수와 염분 $26{\pm}1$ psu에서 7일 동안 각각 1.98mg/L (신뢰한계: 1.45-2.39 mg/L)와 2.63 mg/L (신뢰한계: 1.76-3.37mg/L)였다. 한편 $25^{\circ}C$-일반해수와 염분 $26{\pm}1$ psu에서는 각각 3.89 mg/L (신뢰한계: 3.36-4.55 mg/L)과 3.74 mg/L (신뢰한계 3.19-4.43 mg/L)으로 고수온에서 용존산소에 대한 내성이 약한 것으로 나타났다. 산소소비율은 모든 실험구에서 저산소 노출기간동안 감소하였으며, 회복가능성을 파악하기 위하여 일반해수로 전환시킨 경우 산소소비율을 증가시키며 산소부채에 의한 회복반응을 보였으나 모두 폐사하였다. 저산소 노출기간동안 패각 각정부위의 색깔이 검게 변화하는 것이 관찰되었다. 이 자료는 피조개 집단 폐사원인 구명을 위한 기초자료로 활용할 수 있을 것으로 여겨진다. The ark shell, Scapharca broughtonii were collected from the Jinhae bay in Kyungnam, Korea from April 2006 to October 2007. To assess how much they have tolerance against hypoxia under the compound condition of temperature and salinity, survivorship, oxygen consumption rate and external features of Scapharca broughtonii were measured, The 7 days-$LC_{50}$ of dissolved oxygen (DO) for Scapharca broughtonii at $15^{\circ}C$-ordinary sea water and $26{\pm}1$ psu was 1.98mg/L (confidence limit: 1,45-2.39 mg/L) and 2.63mg/L (confidence limit: 1.76-3.37mg/L) respectively. Whereas 3 days-$LC_{50}$ at $25^{\circ}C$-ordinary sea water was 3.89mg/L (confidence limit: 3.36-4.55 mg/L) and 4 days-$LC_{50}$ at $25^{\circ}C-26{\pm}1$ psu was 3.74mg/L (confidence limit: 3.19-4,43 mg/L). Oxygen consumption rate with each experimental group was decreased during the period exposed to hypoxia. To recovery, they were replaced to ordinary and oxygen consumption rate was increased a little, but all died, The color of the umbo of shell in Scapharca broughtonii was changed dark during hypoxia. These data will provide important fundamental information for examining the causes of mass mortality of shellfish in the summer.
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고등어(Scomber japonicus ) 치어의 마취제로서 Clove oil, MS-222 및 2-Phenoxyethanol의 평가
한석중 ( Seock Jung Han ),김경민 ( Kyong Min Kim ),최낙중 ( Nack Jung Choi ),구준호 ( Jun Ho Koo ),박충국 ( Chung Kug Park ),이원교 ( Won Gyo Lee ),지승철 ( Seung Chul Ji ) 한국수산과학회(구 한국수산학회) 2011 한국수산과학회지 Vol.44 No.6
The efficiency of clove oil, MS-222, and 2-phenoxyethanol was evaluated as anesthetics in juvenile Scomber japonicus . Stage A5 of anesthesia was assumed to be sufficient for conducting routine aquaculture procedures in less than 3 min, with recovery (stage R5) in less than 5 min. The lowest effective doses of the three anesthetics were 50 mg L-1 clove oil (anesthetic time of 71.3 s and recovery time of 167.0 s), 100 mg L-1 MS-222 (anesthetic time of 70.7 s and recovery time of 115.7 s), and 400 mg L-1 2-phenoxyethanol (anesthetic time of 86.7 s and recovery time of 95.0 s). Anesthetic times decreased with increasing doses for all three anesthetic agents, and fish anesthetized with clove oil exhibited the longest recovery times. After 30 min, the highest plasma cortisol and lactate levels were detected with the use of clove oil, whereas the lowest values were observed with 2-phenoxyethanol. In addition, high glucose levels were maintained during recovery with clove oil, but the treatments did not significantly differ. The most effective of the three anesthetic agents was 2-phenoxyethanol, although all were considered acceptable for use in cultures of juvenile Scomber japonicus
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소양호산 쏘가리 Siniperca scherzeri(Pisces , Centropomidae)의 산란 생태와 초기 생활사
이종윤,이완옥,최낙중,손송정 한국어류학회 1997 韓國魚類學會誌 Vol.9 No.1
쏘가리의 양식과 자원 증강을 위한 기초 자료를 얻기 위하여 1996년 6월부터 10월까지 강원도 춘천시 북면의 소양호내에서 산란 생태와 초기 생활사를 조사하였다. 성체의 동소종으로 6과 10속 11종이, 자치어의 동소종으로 3과 4속 4종이 채집되었다. 암수 성비는 1 : 1.24이었다. 본 종의 식성은 성체와 치어 모두 육식성 중에서도 어식성이었고, 파랑볼우럭, 피라미, 잉어 와 미동정 어류, 새우를 섭식하였다. 수정란은 구형의 침성 분리란이었으며, 난막은 투명하였다. 난황은 연한 황색이었으며, 대형 유구(0.5∼0.7㎜)가 1개 있었다. 수정란은 1.72∼2.05㎜(n=30)이었으며, 수정후 30분이 지나면 난막이 팽창하여 2.27∼2.58㎜가 되었다. 수온 20∼25℃에서 수정후 130∼155시간에 부화되었고, 부화 직후의 자어의 크기는 5.5∼7.1㎜였다. 갓 부화된 자어는 난황 표면과 미병부의 복부에 흑색소포가 발달되어 있었다. 부화 10일 후에는 난황의 흡수가 완료되고, 두부와 이빨이 발달되었다. 20일 후에는 모든 지느러미가 성체와 같았고, 전장도 13.6∼15.6㎜로 성장하였다. 부화 55일 후에는 성체와 체형과 체색이 유사하였다. 부화 후 4개월이 지나면 전장 86.4∼95.3㎜ (n=7), 체중 8.77∼14.78g (n=7)의 치어기에 도달하였다. The early life history and reproductive ecology of Siniperca scherzeri were studied to obtain fundamental information in aquaculture and reinforcement of natural population in Soyang Lake, Buk - myon, Chunchon - shi, Kangwon - do from June to October 1996. Symptric species with adult fishes (+1 ages) of Siniperca scherzeri were 11 species belonging to 6 families and 10 genera and those with Juveniles (2∼3 months) were 5 species belonging to 4 families and 5 genera. The sex radio of this species were 1 (female, 85) : 1.24 (male, 105). Adult and juvenile of this species were predominantly piscivores. Bluegill, Lepomis macrochirus, Zacco platypus, co㎜on carp, Cyprinus carpio, unidentified fish and shrimp were important components of the food items. The spherical eggs were demersal and separative without a colorless transparent chorion and slightly yellowish yolk containing one large oil globule (0.5∼0.7㎜). The egg just after fertilization were measuring 1.72∼2.05㎜ (n=30), and expanded to 2.27∼2.58㎜ (n=30) in diameter after 30 min. Hatching occurred 130∼155 hrs after fertilization at water temperature of 20∼25℃ and newly hatched larvae measuring 5.5∼7.1㎜ in total length. In the newly hatched larvae, numerous branched malanophores were distributed on the yolk and abdomen of caudal peduncle. In ten - day old larvae, the yolk was mostly absorbed and the head spines and the teeth were well developed. All fin rays were formed and total length of the larvae were reached 13.6∼15.6㎜ at 20 days after hatching. In fifty - five day old larvae were similar in both body shape and color to adult. The juvenile stage at 4 months after hatching were attained 86.4∼95.3㎜ (n=7) in total length and 8.77∼14.78g (n=7) in body weight.
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