• Fisheries and Aquatic Sciences
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• 제16권2호
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• pp.63-69
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• 2013

Shucked oysters were soaked in an equal weight of salt water and stored at $3^{\circ}C$ for 7 days. Changes in the free amino acid content of the whole body and in the adductor muscle were evaluated by a practical distribution method. With the exception of aspartic acid and tyrosine, no significant changes in free amino acids or ammonia were observed in whole-body shucked oysters during the storage period. In contrast, the majority of free amino acids in the adductor muscle decreased significantly. Most of these free amino acids were detected in considerable amounts in the surrounding salt water after 7 days of storage. Both the weight of the whole body and the salinity of the surrounding salt water decreased significantly during the storage period. These results suggest that free amino acids were eluted from the cutting surface of the adductor muscle and indicate that the free amino acid content per shucked oyster and in the adductor muscle, decreases during cold storage.

• 한국수산과학회지
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• 제44권3호
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• pp.259-266
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• 2011

To produce cupped oyster sprat consistently, we investigated the efficiency of nine settlement substrates using selective breeding of Pacific oyster Crassostrea gigas, with the goal of popularizing off-bottom culture on the west coast of Korea. We also compared the growth and survival of selectively bred sprat (diploid) with triploid sprat from an off-bottom culture system. Considering, the attachment rate and detachment efficiency, producing cupped oyster in a polypropylene gunny bag proved to be the most effective method. There were no differences in shell growth or total weight between the diploids from selective breeding and triploids from off-bottom culture for 5 months. However, the survival rate was 8 times higher in the diploids than the triploids. Transplanting sprat from selective breeding is one way to restore oyster farms and nurture off-bottom culture along the west coast.

• 한국수산과학회지
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• 제49권6호
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• pp.766-771
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• 2016

The pacific oyster Crassostrea gigas has a desirable taste and flavor that differs from those of other fish and shellfish. In order to develop a high value-added product from individually quick-frozen oyster extract (IQFOE), we prepared an oyster granular flavor seasoning (OGS) from IQFOE and characterized its qualities. The OGS was prepared by granular molding and fluidized bed drying with inosine monophosphate (IMP, 0.1%), yeast extract powder (1.4%), tangle extract powder (0.6%), monosodium glutamate (MSG, 5.0%), microcrystalline cellulose (0.6%), lactose (27.5%), salt (33.0%), spray-dried IQFOE (22.5%) as a powdered materials, and IQFOE ($Brix\;25^{\circ}$, 7.0%), soy sauce (0.4%) and water (1.7%) as a liquid materials. The moisture, crude protein, pH and salinity of the OGS were 3.4%, 12.5%, 6.50 and 32.0%, respectively. Especially, the OGS revealed very higher amino-N content (1,856.0 mg/100 g) than that (1,291.2-1,610.2 mg/100 g) of other commercial flavor seasonings. In taste-active compounds, free amino acid contents was 1,359.0 mg/100 g, and major ones were glutamic acid, taurine, hydroxyproline, glycine, lysine, phosphoserine, proline in order. And OGS showed good organoleptic qualities for taste, odor and general preference compared with commercial flavor seasonings on a local market.

• 한국어업기술학회:학술대회논문집
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• 한국어업기술학회 2002년도 춘계 수산관련학회 공둥학술발표회
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• pp.266-266
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• 2002

• 한국패류학회:학술대회논문집
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• 한국패류학회 2002년도 추계학술발표회
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• pp.21-22
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• 2002

• 한국양식학회:학술대회논문집
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• 한국양식학회 2002년도 춘계 한국양식학회 학술대회 발표요지
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• pp.240.2-241
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• 2002

• 한국어업기술학회:학술대회논문집
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• 한국어업기술학회 1997년도 수산관련공동학술대회발표요지집
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• pp.173.1-174
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• 1997

• 한국양식학회지
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• 제9권4호
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• pp.445-452
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• 1996

어류 및 폐류내에 내재하는 내재성 ${\beta}-galactosidase$의 활성도를 분석함으로서 외래유전자의 이식시 기초자료로 활용하고자 어류 6종 및 패류 4종을 대상으로 본 실험을 행하였다. 어류에 있어서의 X-gal 염색 결과 혈청 및 근육을 제외한 모든 조직에서 모두 positive ( + ) 염색 양상을 보였다. 패류에 있어서도 어류와 같은 양상을 보여 근육을 제외한 모든 조직에서 모두 positive 염색 양상을 보였으며 더욱이 참굴에 있어서는 폐각근 및 근육에 있어 매우 진한 염색 반응을 보였다. 근육으로 부터 DNA를 추출한 후 PCR을 수행한 결과 모든 종에서 positive (+) 결과를 나타내었으며, 어패류간 그리고 각 개체간 차이는 없었다. 각 장기별 ${\beta}-galactosidase$의 활성도 측정결과 모든 종에 있어서 혈청의 활성도는 무시할 만한 수준이었고, 근육에서 가장 낮게 나타났다. 미꾸라지와 잉어에서는 신장에서 가장 높은 활성을 보였고, 틸라피아는 소화관에서 가장 높은 값을 보였다. 해산어인 넙치의 경우 돌가지미, 문치가자미의 경우에 비해 간에서 활성이 높았다. 그러나 돌가자미 및 문치가자미인 경우 신장에서 가장 높은 값을 보였다. 패류에 있어서는 소화맹낭에서 가장 높은 활성값을 나타내었고 폐각근 및 외투막에서 매우 낮은 활성값을 나타내었다. 그러나, 참굴에 있어서는 참전복, 피조개 및 진주조개 보다는 상대적으로 폐각근 및 외투근에서 높은 활성을 나타내었다.

• 한국패류학회지
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• 제32권4호
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• pp.269-277
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• 2016

본 연구는 2015년 우리나라 서해안에서 양식된 3배체 굴의 일반성분, 지방산, 아미노산 조성 및 글리코겐 함량의 계절적 변화를 조사하였다. 지방 함량은 겨울철에 가장 높았으며 (2월, $2.10{\pm}0.06%$), 단백질 함량은 가을철에 (11월, $9.09{\pm}0.04%$) 에서 가장 높았고 수분과 회분은 여름철 (8월, $86.00{\pm}0.12%$ 및 $2.67{\pm}0.03%$) 에 가장 높았다. 총아미노산 함량은 겨울철 (1,011.5 mg/100 g) 에 가장 높았고, 점차적으로 감소하여 여름철에 가장 낮았다 (486.7 mg/100 g). 아미노산조성은 taurine, aspartic acid, glutamic acid, glycine 및 alanine 등이 주요 아미노산으로 분석되었다. 지방산 조성에서 전체 지방산 함량의 50 % 이상을 차지하는 지방산은 EPA와 DHA로 확인되었다. 글리코겐 함유량은 여름철에 가장 높았으며 ($1.26{\pm}0.03g/100g$), 다른 시기에는 $0.69{\pm}0.04-0.86{\pm}0.01g/100g$의 범위로 일정한 함량을 보였다. 이상의 결과를 종합해 볼 때, 3배체 굴은 불임처리를 통해 산란을 하지 않아 여름철에 글리코겐 함량이 높아 겨울철뿐만 아니라 여름철에도 상업적 가치가 높은 것으로 확인되었다.

• 환경생물
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• 제20권3호
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• pp.268-275
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• 2002

Seasonal variation in reproductive condition of the Pacific oyster Crassostrea gigas was investigated from a suspended cultured oyster population in Gosung Bay, South Korea using histological techniques, Gametogenesis of oysters initiated in February when water temperature reached 11 to $13^\circ{C}$. Increase in oocyte size and the number resulting in follicle expansion was observed from March to May First spawning of oysters observed in mid Jun when the surface water temperature reached 22 to $25^\circ{C}$. Spawning activity of oysters extended from mid June to late September with two marked spawning peaks in June and August. Most oysters collected from October to December exhibited few residual eggs in packed follicles exhibiting a typical spent condition. No gametes were observed from December to February from oysters collected in the Bay. Gonadal development of oysters in the Bay seemed to follow a seasonal fluctuation in environmental conditions such as water temperature and food availability in the water column. Spawning of oysters in late June was in part associated with sudden drop in salinity due to vast amount of freshwater input in the Bay after the summer flooding. Sex ratio of oysters was 59.5% male and 39.8% female. Less than 1 percent (0.6%) of the oysters examined were hermaphrodite; few eggs were observed in testis.