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Spatiotemporal distribution and feeding ecology of the brown croaker (Miichthys miiuy) in the southwestern sea of Korea

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ENVIRONMENTAL BIOLOGY OF FISHES 2025年第1期108卷 17-37页

作者： Jung, Jin Ho Moon, Seong Yong Park, Jeong-Ho Han, Kyeong-Ho Kim, Changsin Natl Inst Fisheries Sci South Sea Fisheries Res Inst Yeosu 59780 South Korea Natl Inst Fisheries Sci Distant Water Fisheries Resources Div Busan 46083 South Korea Chonnam Natl Univ Dept Fisheries Sci Yeosu 59626 South Korea Natl Inst Fisheries Sci Climate Change Res Div Busan 46083 South Korea

This study investigated the spatiotemporal distribution, feeding ecology, and trophic dynamics of the marine fish species brown croaker (Miichthys miiuy) in the southwestern sea of Korea. As a top predator, M. miiuy primarily consumes small fish, especially anchovies and Larimichthys polyactis, with peak catch rates occurring in autumn. Stomach content analysis confirmed that fish dominate its diet across all size groups. However, notable dietary shifts were observed during the spawning season (July to October), when caridean shrimp, cephalopods, and penaeid shrimp became more prominent, likely because of shifts in prey availability and increased reproductive energy demands. Ontogenetic changes were also apparent, with larger individuals selecting larger prey. The species' opportunistic feeding behavior, adjusting to seasonal and environmental variations, underscores its ecological adaptability. These findings highlight M. miiuy's significant role in controlling the abundance of lower trophic species and stress the importance of further research on its trophic interactions to support marine biodiversity conservation and sustainable fisheries management.

关键词： Spatiotemporal distribution Feeding ecology Miichthys miiuy Spawning season Ontogenetic diet shifts

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An investigation of marine wood boring organism's attack on various wood materials in Korea

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HOLZFORSCHUNG 2025年第4-5期79卷 244-250.0页

作者： Yoon, Sae-Min Park, Yonggun Lee, Hyun-Mi Hwang, Won-Joung Jeong, Seong-Jae Kim, Chul-Ki Kim, Min-Ji Choi, Yong-Seok Natl Inst Forest Sci Forest Prod & Ind Dept Seoul 02455 South Korea Natl Inst Fisheries Sci Fisheries Engn Div Busan 46083 South Korea

This study assessed marine borer damage to various wood species along Korea's coast, severe damage was found in 6 Korean and a tropical (Dillenia) species, other tropical (Apitong and Ipe) and modified woods showed resistance to marine borers even after exposure for up to six months. Molecular identification of organisms from wood samples revealed 12 species, including key marine borers Bankia carinata, Teredo navalis, and Limnoria sp. The results of this study are expected to provide useful information on marine borers and marine durability as preliminary data for the use of wood in the marine environment of Korea.

关键词： marine borer Korean wood species tropical wood species marine borer attack

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Development of oyster protein-enhanced scaffolds with seven-band grouper muscle satellite cells for cultured seafood production

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BIOPROCESS AND BIOSYSTEMS ENGINEERING 2025年第5期48卷 857-875页

作者： Ulagesan, Selvakumari Krishnan, Sathish Nam, Taek-Jeong Choi, Youn-Hee Pukyong Natl Univ Div Fisheries Life Sci Busan 48513 South Korea Pukyong Natl Univ Inst Fisheries Sci Busan 46041 South Korea

Cell-based aquaculture holds significant promise for revolutionizing the seafood industry by addressing the limitations of traditional fishing and aquaculture practices. In this study muscle cells from Seven-band grouper (SBG) Epinephelus septemfasciatus were isolated using an enzymatic digestion method. Initial cell attachment and growth were monitored, showing robust proliferation when cultured in L-15 medium supplemented with 10% fetal bovine serum (FBS) and basic fibroblast growth factor (bFGF). We assessed the biocompatibility and cytotoxicity of two protein sources, oyster protein (OP) and soy protein (SP), for their effects on grouper muscle cell viability and growth. OP demonstrated strong biocompatibility, effectively supporting cell viability and significantly promoting muscle cell proliferation. At a concentration of 10,000 mu g/mL, OP increased muscle cell proliferation by up to 90% after 48 h of incubation. SP, however, exhibited dose-dependent cytotoxic effects, with reduced cell viability observed at higher concentrations (10,000 mu g/mL) over 48 h. This comparative analysis indicates that OP maintains cellular health and enhances cell growth, while SP may limit cell viability at elevated concentrations. Following these findings, we prepared a scaffold using Alginate-kappa-Carrageenan (Alg-kappa-Car) combined with oyster protein (Alg-kappa-Car-OP), which showed enhanced gelation and printability properties. 3D bioprinting of grouper muscle satellite cells (GMSC) within Alg-kappa-Car-OP scaffolds resulted in higher cell viability than Alg-kappa-Car scaffolds alone. Taste sensory analysis using an electronic tongue revealed distinct taste profiles, with Alg-kappa-Car-OP-GMSC scaffolds exhibiting the highest umami score. Flavor analysis using flash gas chromatography and an electronic nose differentiated between scaffold types and protein samples, highlighting potential flavor markers. These findings underscore the potential of cell-based aquaculture, es

关键词： Cultured meat Seven-band grouper Cellular aquaculture Oyster Protein Biopolymers 3D Printing Taste analysis

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Trophic niche shifts in Japanese anchovy, Engraulis japonica, during ontogenetic migration in a temperate continental shelf system

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PROGRESS IN OCEANOGRAPHY 2025年 234卷

作者： Kim, Changseong Jang, Jaebin Yang, Jaesik Choi, Jang Han Kang, Hee Yoon Moon, Seong Yong Soh, Ho Young Kim, Heeyong Kang, Chang-Keun Gwangju Inst Sci & Technol Sch Earth Sci & Environm Engn Gwangju 61500 South Korea Chonnam Natl Univ Dept Ocean Integrated Sci Yeosu 59626 South Korea Chonnam Natl Univ Dept Oceanog Gwangju 61186 South Korea Natl Inst Fisheries Sci South Sea Fisheries Res Inst Yeosu 59780 South Korea Natl Inst Fisheries Sci Distant Water Fisheries Res Div Busan 46083 South Korea

Understanding the mechanisms driving ontogenetic niche shifts in fishes has predominantly focused on dietary changes in large predatory migrants. This study investigates trophic niche dynamics in a small, pelagic migratory fish, the Japanese anchovy (Engraulis japonicus). By mapping migratory paths across varied oceanographic regions on a temperate continental shelf of Korean waters, we quantified changes in the trophic niche using delta 13C and delta 15N values across different ontogenetic stages (juvenile, subadult, and adult). We hypothesized that biological and ecological processes associated with fish ontogeny and migration cause trophic niche shifts. Results showed that juvenile anchovies had a narrow trophic niche, which expanded as they matured, indicating a shift from specialist to generalist feeding habits, unlike many large predatory fishes. Limited isotopic niche overlap among life stages suggested niche partitioning within inshore habitats where all stages coexist. Morphological and behavioral traits related to life history likely drive these feeding modes and prey use changes. Isotopic profiles varied with migratory routes, reflecting spatial variations in zooplankton isotope baselines. Adults showed higher delta 13C in the southern offshore (Yangtze River Diluted Water area) and lower delta 15N in the eastern offshore (Tsushima Warm Current area) compared with inshore (South Korea Coastal Water area), resulting in distinct isotopic niches. This isotopic variation is likely due to differing lower trophic-level processes and zooplankton assemblages, as supported by our dietary mixing model. Our findings highlight that ontogenetic changes in feeding habits and adaptive responses to prey availability along their migratory paths facilitate trophic niche shifts in Japanese anchovy.

关键词： Japanese anchovy Ontogenetic migration Trophic niche shift Stable isotopes Resource use Food partitioning South Sea of Korea

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Influence of biotic and abiotic factors on mesozooplankton and fish larvae community structures in a fisheries resource protected area: A case study of Gangjin Bay, Korea

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REGIONAL STUDIES IN MARINE sciENCE 2025年 85卷

作者： Moon, Seong Yong Park, Jeong-Ho Jung, Hyun Suk Kim, Changsin South Sea Fisheries Res Inst Natl Inst Fisheries Sci Yeosu 59780 South Korea Natl Inst Fisheries Sci Distant Water Fisheries Resources Div Busan 46083 South Korea SEAENA Marine Inst Co Yeosu 59623 South Korea Natl Inst Fisheries Sci Ocean Climate & Ecol Res Div Busan 46083 South Korea

Mesozooplankton and fish larvae are critical components of aquatic food webs, and their community structure is essential for effective fisheries management. However, since 1999, no data on these communities have been recorded in Gangjin Bay, Korea, a designated fisheries Resources Protected Area and a crucial spawning and nursery ground for various fish species. This study investigated the community structure of mesozooplankton and fish larvae in Gangjin Bay from March to November 2022 through monthly sampling. In spring, Noctiluca scintillans dominated, while copepods and cirripedian larvae prevailed in summer and autumn, respectively. The biotic and abiotic factors influencing the community structure of Paracalanus orientalis and Acartia ohtsukai included water temperature and concentrations of chlorophyll a in the micro- and pico-fractions. The biotic and abiotic factors influencing the community structure of anchovy and goby larvae included the abundance of P. orientalis and A. ohtsukai, while those affecting Sebastes inermis larvae were influenced by the abundance of Calanus sinicus and mesozooplankton biomass, particularly in the 1.0-mm size class. This study provides baseline data to describe the community structure of mesozooplankton and fish larvae in Gangjin Bay, thereby contributing to the development of policies for fisheries resource protection and management.

关键词： Gangjin Bay Mesozooplankton Fish larvae Community structure Environmental factor

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Cirrhimuraena taiwanensis sp. nov., a new species of cirri-bearing eel (Anguilliformes, Ophichthidae) from Yilan, northeastern Taiwan

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ZOOKEYS 2025年第1224期1224卷 129-140页

作者： Lin, Yen-Ting Lin, Yu-Hsiang Han, Yu-San Natl Taiwan Univ Inst Fisheries Sci Coll Life Sci Taipei Taiwan

A new species of cirri-bearing eel, Cirrhimuraena taiwanensis sp. nov. (Anguilliformes, Ophichthidae), is described based on a specimen collected from the estuary of the Langyang River (Yilan County), northeastern Taiwan. The new species is distinct from all congeners, except C. odishaensis and C. orientalis, in possessing a single row of mandibular teeth. Cirrhimuraena taiwanensis sp. nov. differs from C. odishaensis in having significantly shorter pectoral fins and fewer vertebrae, and it is distinguished from C. orientalis by its larger head, notably more total vertebrae, and a dorsal fin that originates well behind the gill opening. In the neighbor-joining tree based on COI sequences, the new species forms a distinct monophyletic group;thus, it is clearly separable from congeners both morphologically and genetically. With this addition, there are now 13 species in the genus Cirrhimuraena.

关键词： Biodiversity brackish water COI analysis Taiwanese fringe-lip eel taxonomy

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Development of a TGC-based growth model for the olive flounder, Paralichthys olivaceus, , and its application in developing a fish growth simulator architecture

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AQUACULTURE 2025年 594卷

作者： Seo, Junhyuk Park, Jeonghwan Natl Inst Fisheries Sci Adv Aquaculture Res Ctr Chang Won 51688 South Korea Pukyong Natl Univ Coll fisheries Sci Div Fisheries Life Sci Busan 48513 South Korea

Temperature is one of the main factors affecting fish growth. Many studies have proposed a fish growth model considering the effect of temperature. Among these models, the TGC (thermal growth coefficient) model which digitized the influence of temperature on fish growth is the most notable. The original TGC model was made in the form of applying 1/3 as an exponent, but subsequent studies have shown that it is necessary to apply different exponent value or other constant depending on the dynamics of growth. In this study, the original TGC model using 1/3 as an exponent and the new model using 2/3 as an exponent were compared for olive flounder (Paralichthys olivaceus). The seasonal temperature function under the conditions of the flow-through system was applied and the transition point of change in the growth dynamics was obtained by comparing the instantaneous growth rate of the two TGC models. Around 541 g of the transition point was obtained, and a combined TGC model was presented that integrated the two models. However, the growth prediction model based on these statistical techniques does not reflect real-time changes in each parameter and requires academic knowledge, making it difficult to use in the actual field. Recently, as the smart aquaculture industry incorporating ICT (information and communication technologies) has grown rapidly, many solutions such as fish growth prediction simulators using statistical growth models have been developed. Therefore, in this study, input and output variables were classified and software architectures were presented so that the statistical form of fish growth model using TGC derived above could be applied when developing a fish growth prediction simulator. Deriving these growth models and interpreting them into languages in the field of ICT will enhance the field applicability of academic research results as a part of smart aquaculture technology.

关键词： Growth model Olive flounder Smart aquaculture Simulator Architecture

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Establishment, characterization, and sensory characteristics (taste and flavor) of an immortalized muscle cell line from the seven-band grouper Epinephelus septemfasciatus: implications for cultured seafood applications

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IN VITRO CELLULAR & DEVELOPMENTAL BIOLOGY-ANIMAL 2025年第1期61卷 8-23页

作者： Krishnan, Sathish Ulagesan, Selvakumari Moon, Ji-Sung Choi, Youn-Hee Nam, Taek-Jeong Pukyong Natl Univ Inst Fisheries Sci Pusan 46041 South Korea Pukyong Natl Univ Div Fisheries Life Sci Busan 48513 South Korea

Grouper muscle satellite cells (GMSCs) from the seven-band grouper (Epinephelus septemfasciatus) were isolated, and their growth conditions were optimized (10% fetal bovine serum, 24 degrees C, 10 ng/mL bFGF). The cells were immortalized at passage 14 and designated as grouper immortalized muscle satellite cells (GIMSCs). DNA barcoding confirmed the grouper origin of both GMSC and GIMSC lines. GIMSCs exhibited enhanced proliferation, accelerated differentiation, and robust myotube formation compared to pre-crisis GMSCs. Western blot analysis showed upregulation of key myogenic factors (Pax7, MyoD, MyoG) and structural proteins (Desmin) in GIMSC, indicating the differentiation potential. The immortalized GIMSC line maintained consistent morphology, growth rates, and viability across multiple passages. Biocompatibility studies showed GIMSCs were compatible with bio-inks (sodium alginate, gelatin, kappa-carrageenan) at 250 to 10,000 mu g/mL, retaining similar to 80% viability at the highest concentration. Taste sensory analysis revealed GMSCs had the highest umami and lowest saltiness and sourness, contrasting with the muscle of the seven-band grouper, which had higher saltiness and sourness. Flavor analysis identified pronounced fishy, hot fat, and ethereal flavors in the cells at higher level than in the muscle. These findings suggest GMSCs and GIMSCs are promising for producing cultured meat with enhanced umami taste and flavors, advancing cellular agriculture and sustainable food production.

关键词： Cultured seafood Seven-band grouper Immortalized cell line Muscle satellite cells Cellular aquaculture Taste sensory analysis Flavor analysis

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Nitrogen Source Preferences and Ecological Implications of Phytoplankton Primary Production in the Yellow Sea, South Sea of Korea, and East/Japan Sea, 2018

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JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOsciENCES 2025年第2期130卷

作者： Jang, Hyo Keun Kang, Jae Joong Lee, Dabin Kim, Kwanwoo Kim, Myung Joon Park, Sanghoon Kim, Yejin Kim, Jaesoon Joo, Huitae Youn, Seok-Hyun Lee, Sang Heon Natl Inst Fisheries Sci Ocean Climate & Ecol Res Div Busan South Korea Natl Inst Fisheries Sci Marine Environm Res Div Busan South Korea Korea Inst Ocean Sci & Technol Marine Nat Disaster Res Dept Busan South Korea Natl Inst Fisheries Sci Fisheries Resources Res Ctr Tongyeong South Korea Pusan Natl Univ Marine Res Inst Dept Oceanog Busan South Korea

Understanding the partitioning of primary production into new and regenerated productions, based on nitrate or ammonium utilization, is crucial to understanding biogeochemical processes and marine ecosystems. This study addresses the scarcity of information on new and regenerated productions in the Yellow Sea (YS), South Sea (SS), and East/Japan Sea (EJS). Employing the C-13-N-15 tracer method, we quantified carbon and nitrogen uptake rates of phytoplankton across four seasons in 2018. Seasonal nitrate and ammonium uptake rates exhibited distinct ranges in the YS (0.2-6.1 and 0.4-22.3 mg N m(-2) hr(-1)), SS (1.0-15.6 and 4.5-15.4 mg N m(-2) hr(-1)), and EJS (1.5-7.3 and 4.5-15.4 mg N m(-2) hr(-1)). Notably, nitrate uptake rates in the YS (except spring), SS, and EJS were generally lower than ammonium uptake rates, attributed to the dominance of pico-sized (<2 mu m) phytoplankton with a high affinity for ammonium. Carbon uptake rates in all seas displayed significant positive correlations with nitrate uptakes rather than ammonium uptakes, suggesting that the prevailing ammonium assimilations by dominant pico-sized phytoplankton contributed to the lower primary productions in 2018. Estimated annual new productions (30, 24, and 43 g C m(-2) y(-1)) in the YS, SS, and EJS fall within the reported ranges for other regions. However, the EJS exhibited lower productions than previous reports (146 g C m(-2) y(-1)), potentially impacting fishery yields and export production to the deep ocean in 2018. These findings, in the context of rapid environmental changes, provide crucial baseline information for monitoring future marine ecosystems in Korean seas.

关键词： nitrate uptake rates ammonium uptake rates pico-sized phytoplankton yellow sea South sea of Korea East/Japan sea

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Enhancing the performance of Litopenaeus vannamei nursery and grow-out by modifying Mg/Ca ratios in biofloc systems using low-salinity groundwater of Kuwait Desert

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AQUACULTURE 2025年 594卷

作者： Al-Subiai, Sherain N. Jang, In Kwon Bae, Sun-Hye Yoon, Hong-seok Hussain, Sumaiah AlNuaimi, Sabeekah Al-Foudari, Muhammad Al-Hasan, Enas Kuwait Inst Sci Res Environm & Life Sci Res Ctr Aquaculture Program Kuwait Kuwait Natl Inst Fisheries Sci West Sea Mariculture Res Ctr Taean South Korea Pukyong Natl Univ Coll Fisheries Sci Div Fisheries Life Sci Busan South Korea

Kuwait has one of the most arid climates in the world, with brackish groundwater that has excessively high hardness due to limestone-rich aquifers with suboptimal ionic compositions, high evapotranspiration, and scarce water sources for shrimp farming. The study aimed to assess whether increasing the magnesium to calcium (Mg/ Ca) ratio through Mg-supplementation could enhance shrimp performance, despite the absolute magnesium concentration being higher than diluted seawater of the same salinity. The study comprised a 4-week nursery and an 8-week grow-out trial with Pacific White Shrimp (Litopenaeus vannamei) in low-salinity groundwater in a biofloc system. Experimental groups included a groundwater control (Mg/Ca ratio 0.49) and three different Mg/ Ca ratios (about 1, 2 and 3) in three replicates. Postlarvae (0.02 g) and juveniles (0.54 g) were stocked at a density of 1250 and 250 m-3 in the nursery and grow-out trials, respectively, in 1,000 L tanks. In the nursery trial, the control exhibited a final weight of 0.174 g and a survival rate of 58.5%, which was significantly lower in comparison to all Mg+2 treatments, exceeding 0.215 g and 92.5%, with no significant differences between the three treatments. The grow-out trial revealed a proportional increase in growth rate with the Mg/Ca ratio, showing a significantly better performance in treatments with Mg/Ca ratios of 2.12 or higher. The Mg/Ca 2 treatment exhibited the best performance, with a survival rate of 70.8% and a yield of 2.89 kg m- 3 of mean weight 16.3 g. The results showed that Mg/Ca ratios have an affect both survival and growth in postlarvae, but only growth in juveniles and larger shrimp. The study suggests that increasing the Mg/Ca ratio above 1.07 and 2.12 through magnesium supplementation can significantly improve shrimp growth in nursery and grow-out phases in low-salinity water. Additionally, the expression of immune-related genes such as prophenoloxidase (proPO), transglutaminase (TGase) and cy

关键词： L. vannamei Biofloc Ionic modification Inland shrimp farming Kuwait Desert

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