• Journal of Life Science
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• v.30 no.12
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• pp.1063-1069
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• 2020

Two crucian carp species (Carassius auratus and C. cuvieri) inhabit Lake Yedang in South Korea, and C. auratus is known to be native to Korea. Classification of these two freshwater fish species is often confused because of their morphological similarity. To distinguish the two species, we conducted phylogenetic and population genetic analyses of C. auratus and C. cuvieri based on their mitochondrial DNA sequences of the cytochrome b gene (CYTB). We also compared our partial CYTB sequence (<1,056 bp) with 10 Chinese, nine Japanese, and two Russian crucian carp fishes. The results of our phylogenetic analysis showed that C. auratus and C. cuvieri were clearly divided into two phylogroups. The nucleotide diversity (π) of C. auratus from Korea, China, and Japan showed a range of 0.146%~0.421%, while the range of π of C. cuvieri from Korea and Japan was lower than those of C. auratus (0.0%~0.054%). Moreover, the comparison of CYTB divergence among crucian carp fishes in China, Japan, and Korea indicated that Korean Carassius fishes were distantly related to those from China and Japan, with two exceptions: the pairwise Fst value between Korean C. auratus and northern Chinese C. auratus was not significantly different. In addition, no significant genetic divergence between Korean and Japanese C. cuvieri was detected. We conclude that, despite the morphological similarities, C. auratus and C. cuvieri should be considered as separate freshwater fish resources in conservation efforts for genetic diversity.

• Journal of Marine Life Science
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• v.7 no.2
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• pp.187-195
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• 2022

Crucian carp, Carassius carassius (Weight 28.1±3.7 g, Length 10.0±1.0 cm) were challenged with Aeromonas hydrophila at 0, 2.0×10⁴, 2.0×10⁵, 2.0×10⁶, 2.0×10⁷ CFU/ml for 2 weeks. The lethal concentration 50 (LC₅₀) at 2 weeks of C. carassius challenged with A. hydrophila was 19.776×10⁵ CFU/ml. In hematological parameters, the hemoglobin and RBC counts were significantly decreased by A. hydrophila challenge, whereas there was no significant change in hematocrit. The inorganic plasma components such as magnesium and calcium were significantly decreased. In organic plasma components, glucose and cholesterol were significantly increased by A. hydrophila challenge, whereas total protein was significantly decreased. In enzymatic plasma components, ALP (Alkaline phosphatase) were significantly increased by A. hydrophila challenge. The results of this study suggest that the A. hydrophila challenge to C. carassius induced the significant physiological changes in the hematological parameters and plasma components as deadly pathogenic bacteria.

• Journal of fish pathology
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• v.36 no.2
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• pp.323-336
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• 2023

This study was conducted to find out the effect of yeast by-products discarded after beer production as feed additives for carp (Cyprinus carpio). After producing feed by adding high-temperature dried beer yeast by-products (HD), freeze-dried beer yeast by-products (FD), and freeze-dried fermented beer yeast by-products (FF) after lactobacilli fermentation, innate immunity indicators, survival rates, and challenge experiments were evaluated. Both ACH50 and lysozyme activity were significantly increased (p<0.05) in the experimental group of FF 0.2% and 0.5% compared to the control group from day 7 to day 21. In addition, phagocyte activity was significantly increased (p<0.05) in the group of FF 0.5% compared to the control group at all time points. Both IL-1β and TNF-α expression levels increased significantly in the FD and FF groups on day 21 compared to the control group (p<0.05). In addition, the FF 0.5% group showed significantly higher expression levels (p<0.05) at all time points. Similarly, IL-10 expression increased significantly (p<0.05) in FF 0.2% and 0.5% groups at all time points. SOD gene expression was significantly increased in FD 0.5% and all FF groups on day 14 and 21 (p<0.05). The results of a 10-day challenge experiment using Edwardsiella piscicida (E. piscicida) showed a higher relative survival rate than the control group at all concentrations that fed FD and FF. In summary, it is estimated that 0.5% FF can effectively improve the innate immunity, growth rate, and antibacterial properties of carp rather than using discarded beer yeast supernatant alone as a functional feed additive.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2010.10a
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• pp.291-292
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• 2010

• Proceedings of the Korea Contents Association Conference
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• 2017.05a
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• pp.143-144
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• 2017

최근 여가생활의 중요성이 부각되며 스포츠 관람도 여가생활로써 각광받고 있다. 구단도 브랜드라고 볼 수 있다. 스포츠 구단을 응원하기 위한 방법은 관람뿐만 아니라 구단의 라이선싱 상품을 구입하는 것도 방법이다. 한 브랜드의 판매상품을 구성하려면 구매자들의 문화를 파악하고 분석하여야 한다. 이 발표는 일본인들의 문화의 하나인 '오미야게' 문화에 대해 알아보고 그로 인해 일본의 야구 구단의 판매상품 구성에 끼친 영향에 대해 연구하고자 한다.

• Proceedings of the Korean Society of Fisheries Technology Conference
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• 2003.05a
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• pp.223-224
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• 2003

Information on the fate of the added nutrients is essential for the assessment of the food utilization, pond fertility, water quality and processes in the sediment (Boyd, 1985). Also, they are useful for qualifying environmental impacts of aquaculture and for environmental management. The purpose of this experiment was to assess the fate of nitrogen and organic matter entering aquaculture ponds and the relative importance of the different resources. (omitted)

• Proceedings of the Korean Society of Fisheries Technology Conference
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• 2003.05a
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• pp.156-157
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• 2003

In teleost, vitellogenin (Vtg) is synthesised in the liver in response to estrogens and transported by the blood to the growing oocytes where it is incorporated by micropincytosis (Selman and Wallace, 1982). Generally, Vtg is not induced in normal male fish but male fish are capable of synthesis Vtg in reponse to exogenous estrogen and xenoestrogens. (omitted)

• Proceedings of the Korea Society of Environmental Toocicology Conference
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• 2002.05a
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• pp.67-67
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• 2002

• Proceedings of the Korean Society of Toxicology Conference
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• 2002.11b
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• pp.174-174
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• 2002

Metallothioneins (MTs) are known to be induced by heavy metals in various organs of different species and represent a potential biomarker of aquatic contamination by heavy metals. In this work, cloning and sequencing of a metallothionein gene in crucian carp (Carassius auratus) was done and sensitivities and specificities of the gene expressions were compared.(omitted)

• Proceedings of the Korea Society of Environmental Toocicology Conference
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• 2000.12a
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• pp.60-60
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• 2000