• 한국수산과학회지
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• 제51권1호
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• pp.47-53
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• 2018

The presence of pathogens in wild fish is a potential threat to the fish being raised nearby fish farm. Surveillance of these pathogens in the wild is, thus, highly important to keep fish in the farm safe from serious communicable diseases. Fish and crustacean were sampled 4 times at Soyang Lake in 2016. Pathogens for five reportable communicable diseases including KHVD (koi herpesvirus disease), SVC (spring viraemia of carp), EUS (epizootic ulcerative syndrome) and WSD (white spot disease), and parasites were investigated. In Soyang Lake, pale chub Zacco platypus was the most abundant. Forty seven pale chub, 8 Korea piscivorous chub Opsarichthys uncirostris, 3 oily shiner Sarcocheilichthys variegatus wakiyae and 2 crucian carp Cyprinus carassius were investigated for detection of target diseases of fish. Seventeen Caridina denticulata denticulata, 12 Oriental river prawn Macrobrachium nipponense and 1 Chinese mitten crab Eriocheir sinensis were used for detection of WSD. As the result, reportable communicable diseases were not detected in all the freshwater animals. Dactylogyrus was detected in Korea piscivorous chub. Copepoda was also detected in pale chub and Korea piscivorous chub. Metacercaria was detected in the pale chub sampled in September and October. Those were not metacercaria of liver fluke Clonorchis sinensis.

• 한국수산과학회지
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• 제51권3호
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• pp.248-253
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• 2018

Freshwater farms are primarily located adjacent to rivers and lakes, facilitating the introduction and spread of pathogens into natural systems. Therefore, it is necessary to continuously monitor natural aquatic organisms, the breeding environment, and infection rates by pathogenic organisms. Fish and crustaceans were sampled 4 times in the Geum River estuary in 2016. The samples were analyzed for the presence of pathogens for reportable communicable diseases, including KHVD (koi herpesvirus disease), SVC (spring viraemia of carp), EUS (epizootic ulcerative syndrome) and WSD (white spot disease); parasite abundance was also examined. The dominant fish species were deep body bitterling Acanthorhodes macropterus (21.4%), followed by skygager Erythroculter erythropterus (12.7%). For crustaceans, Palaemon paucidens and Chinese mitten crab Eriocheir sinensis were dominant. Sixty fish and 36 crustacean species were examined for reportable communicable diseases. When using a specific primer set for each disease, PCR analysis did not detect any reportable communicable diseases in the samples. Some instances of Dactylogyrus, copepods, nematodes and metacercaria were detected. However, the PCR results indicated that the metacercaria were not Clonorchis sinensis.

• 생명과학회지
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• 제27권3호
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• pp.339-345
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• 2017

Carotenoid는 천연 지용성 색소이며, 세균, 조류, 식물 등이 생산한다. 세계 시장의 대부분을 차지하는 합성 염료의 대안으로서 현재는 조류나 세균, 갑각류 등의 원료로부터 아스타잔틴의 생산, 정제, 이용이 주목 받고 있다. 이 연구는 UV와 EMS를 이용하여 P. haeundaensis의 돌연변이를 유도하고, 결과적으로 astaxanthin을 과잉 생산하는 돌연변이주를 선별하고 특성을 확인하기 위해 다양한 배양 및 영양 조건을 이용하여 astaxanthin 생산량을 확인하였다. 실험 결과 UV 조사 시간이 증가하거나, EMS 농도가 증가할수록 균주의 생존율이 감소하였다. Astaxanthin 과잉 생산 돌연변이 균주의 경우 400 mM EMS와 UV 20분을 순차적으로 처리한 방법에서 선별된 변이주가 가장 높은 astaxanthin 생산량을 보이는 것을 확인하였으며, 이 균주의 이름을 PUE로 명명하였다. PUE의 최적 배양 조건은 $25^{\circ}C$, pH 7-8, 3% NaCl이며, 1% raffinose, 3% potassium nitrate 첨가 시 astaxanthin 생산량이 증가하는 것으로 밝혀졌다. PUE에서는 wild type 균주에 비해 astaxanthin 생산량이 1.58배 증가함을 확인할 수 있었다. 본 연구의 실험 결과, 돌연변이 유도에 의해 선별된 변이주는 astaxanthin의 산업적 생산에 활용 가능한 후보가 될 수 있을 것으로 사료된다.