Jong-Cheol Han

National Fisheries Research and Development Institute

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U-Cheol Jeong

Gyeongsang National University

Seok-Joong Kang

Gyeongsang National University

Jong-Kuk Choi

Gyeongsang National University

Feng Jin

Weifang Medical University

Seok-Joong Kang

Korea Fisheries Resources Agency

Byong-Dae Choi

Byeong-Dae Choi

Gyeongsang National University

Yeon-Min JEONG

Haeng Woon Kim

Hee-Woong Kang

National Fisheries Research and Development Institute

Cooperative Institutions

Gyeongsang National University

National Fisheries Research and Development Institute

Pukyong National University

Korea Fisheries Resources Agency

Beijing Forestry University

Bangladesh Agricultural University

Chittagong Medical College

Pohang University of Science and Technology

Korea Environment Institute

Seoul National University

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Lipid and Fatty Acid Composition in Nannochloropsis oculata Cultured in Varying Salinities

Korean Journal of Fisheries and Aquatic Sciences (2013)

U-Cheol Jeong Jong-Cheol Han Byeong-Dae Choi Seok-Joong Kang

The quality and quantity of food organisms in fish seed production are important. The marine microalgae Nannochloropsis oculata are used as initial food organisms in the field. We investigated the effects of salinity (0, 10, 20, 30, 40 and 50 psu) on the lipid and fatty acid composition of N. oculata. Cultivation of N. oculata at varying salinities showed the highest growth rate at 20 psu. Total lipid content ranged from 17.26 to 18.63% at salinities from 0 to 50 psu). The nonpolar lipid content increased markedly at 30 psu and was highest at 15.55%. The polar lipid content was lowest at 30 psu, by 84.45%. It was also found that the omega-3 and EPA contents were inversely proportional to salt concentration. For the polar and nonpolar lipid compositions, there was no significant effect of salinity. Omega-3 polyunsaturated fatty acid content especially the content of EPA in the seawater larvae is the essential fatty acid in this food organism. It is thus advantageous to culture N. oculata at 20 psu.

Nannochloropsis

10.5657/kfas.2013.0252

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Morphometric Characteristics between Silver Pomfret, Pampus punctatissimus and Korean Pomfret, Pampus argenteus

Journal of Fisheries and Marine Sciences Education (2021)

Hee-Woong Kang Jong-Cheol Han Young-Guk Jin Kyung-Mi Lee Yeon-Min JEONG

The external morphometric characteristics of silver pomfret, Pampus punctatissimus and Korean pomfret, P. argenteus of Stomateidae in Korea were investigated through direct distance. The 16 measurements were expressed as a ratio to the total length, resulting in 8 measurements of P. punctatissimus were found to be larger than those of the P. argenteus (p<0.05). The factors by components in the morphometric characteristics were extracted into three sub-factors, among which factor 1 was length component of species division, factor 2 was length component of body shape, and factor 3 was length component of pectoral section. As for the correlation between the length factor between P. punctatissimus and P. argenteus, DFL-DH showed the highest positive correlation by 0.923. The most remarkably distinguishable factor for the morphometric trait of Stomateidae was the length in dorsal and anal fin shapes, DH and AH, which were longer in the P. punctatissimus than in P. argenteus.

Dorsal fin

10.13000/jfmse.2021.8.33.4.994

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Effects of DHA-rich Fermented Soybean Meal as a Dietary Protein Replacement for Fish Meal in the Parrot Fish Oplegnathus fasciatus

Korean Journal of Fisheries and Aquatic Sciences (2014)

U-Cheol Jeong Feng Jin Jong-Cheol Han Byeong-Dae Choi Seok-Joong Kang

This study determined the level of fermented soybean meal (FSM) that could be substituted for fish meal in the diet for parrot fish Oplegnathus fasciatus. Fish meal (FM) was used the sole protein source in the control diet. FSM was substituted for 20, 40, 60, 80, and 100% of the fish meal in the experimental diets. The FSM resulted in increased crude protein, crude fat, and crude ash, but decreased crude fiber. The methionine and tryptophan contents in the FSM increased, while lysine and threonine decreased. The 18:2n-6 fatty acid content decreased from 55.30% to 28.67%. Fermentation increased 20:5n-3 (EPA) and 22:6n-3 (DHA) by 2.03% and 15.54%, respectively, although the differences were not significant. Based on growth performance, we concluded that FSM could replace up to 60% of FM for the maximum growth of juvenile parrot fish.

10.5657/kfas.2014.0376

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상향식 수류 장치를 이용한 어린 개체굴의 양성 효과

Lim Hyun Jeong In Joon Hwang Jong-Cheol Han Jin Ok Choi Saebom Sohn

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Cloning, Expression, and Characterization of a Cold-Adapted Shikimate Kinase from the Psychrophilic Bacterium Colwellia psychrerythraea 34H

Journal of Microbiology and Biotechnology (2016)

Wahyu Nugroho Dongwoo Kim Jong-Cheol Han Young Baek Hur Soo‐Wan Nam

Psychrophile

Shikimate pathway

Enzyme Kinetics

Mesophile

10.4014/jmb.1608.08049

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Sea Cucumber Apostichopus japonicas Growth in Pond-bottom and Lantern-net Cultures

Korean Journal of Fisheries and Aquatic Sciences (2016)

U-Cheol Jeong Jong-Cheol Han Seok-Joong Kang

Sea cucumbers have been an important part of human diets throughout history; demand is increasing every year, making the species a target for coastal resource development. New harvesting technologies have been developed in response to demand, including nursery production and insemination aquaculture, but such methods produce relatively few individuals and productivity per unit area is very small. For example, captures are prohibited during July and August due to the breeding season, and sea cucumbers aestivate during the hot season and hibernate during the cold season, all factors that limit natural-environment production in Korea. Problems with slow growth of sea cucumbers have been encountered in previous rearing experiments. To assess the importance of feeding ecology on sea cucumber growth, we conducted pond-bottom and lantern-net culture experiments. Results showed that sea cucumbers in bottom cultures grew from 3.06 to 102.59 g, but those in lantern cultures only grew from 25.60 to 28.03 g.

Apostichopus japonicus

10.5657/kfas.2016.0337

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A Laboratory-scale Recirculating Aquaculture System for Sea Cucumber Apostichopus japonicus

Korean Journal of Fisheries and Aquatic Sciences (2016)

U-Cheol Jeong Feng Jin Jong-Kuk Choi Jong-Cheol Han Byong-Dae Choi

The sea cucumber Apostichopus japonicus is a commercially valuable aquaculture species in Korea. Aquaculture species require specific nursery culture conditions to increase survival and growth rates. Sea cucumbers hibernate during the high temperatures of summer and during the low temperatures of winter, and suboptimal temperature conditions decrease sea cucumber growth and survival rates. The natural South Korean environment is very unfavorable for culturing sea cucumber; therefore, developing a recirculating aquaculture system (RAS) capable of breeding and growing sea cucumber year-round is necessary. The aim of this study was to investigate growth performance of juvenile sea cucumber in a RAS. Growth and survival rates of juvenile sea cucumber were high during our 24-week experiment. Sea cucumber survival rates were 87.8-93.3%, and specific growth rates were 0.4689-0.7846.

Apostichopus japonicus

10.5657/kfas.2016.0343

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Effect of High Water Temperature on the Growth and Lipid Compositions of the Sea Cucumber Apostichopus japonicus

Korean Journal of Fisheries and Aquatic Sciences (2019)

U-Cheol Jeong Md Anisuzzaman Feng Jin Jong-Kuk Choi Jong-Cheol Han

Apostichopus japonicus

10.5657/kfas.2019.0400

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고수온에서의 해삼(Apostichopus japonicus) 성장과 체지방 조성

한국수산과학회지 (2019)

U-Cheol Jeong A Anisuzzaman Feng Jin Jong-Kuk Choi Jong-Cheol Han

The optimum growth temperature of sea cucumber is 18°C, above 20°C, the appetite declines and the digestive tract is atrophied. At 25°C or more, it is known that the digestive tract is degenerated as growth is stopped by minimizing metabolic activity. Because of these physiological and ecological characteristics, the growth period of sea cucumber Apostichopus japonicus is relatively short in the natural environment of Korea where four seasons are clear. Therefore, maintenance of water temperature in sea cucumber culture is very important. This experiment was conducted to investigate the growth and lipid compositions of sea cucumbers at high temperature. Results showed that the growth and survival rates of sea cucumber were not significantly different until 26°C (P>0.01). The fatty acid compositions of total lipid of sea cucumber tended to increase with saturated fatty acid content and decrease with n-3 fatty acid content at higher water temperature.

Apostichopus japonicus

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