Inland Fisheries Research Institute

Gyeonggi do, South Korea

Inland Fisheries Research Institute

Gyeonggi do, South Korea
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Kim J.-W.,Gyeongsang National University | Lee J.-H.,Inland Fisheries Research Institute | Bae J.-S.,Gyeongsang National University | An C.M.,South Korean National Fisheries Research and Development Institute | And 3 more authors.
Developmental and Comparative Immunology | Year: 2015

Thioredoxin-interacting protein (TXNIP) is an important regulator of glucose metabolism that functions by inhibiting cellular glucose uptake. The full-length rock bream (. Oplegnathus fasciatus) TXNIP (RbTXNIP) cDNA (2499 bp) contains an open reading frame of 1188 bp encoding 396 amino acids. Furthermore, multiple alignments showed that the arrestin domain was well conserved among the other TXNIP sequences tested. RbTXNIP was predicted to contain a PxxP and PPxY motif. Phylogenetic analysis indicated that RbTXNIP is most closely related to Fugu rubripes TXNIP. RbTXNIP was expressed significantly in the RBC, intestine, and spleen. RbTXNIP mRNA expression was also examined in several tissues under conditions of bacterial and viral challenge. Generally, all tissues examined from fish infected with Streptococcus iniae, Edwardsiella tarda and red sea bream iridovirus (RSIV) showed significant downregulation in RbTXNIP expression compared to controls. However, RbTXNIP expression showed significant upregulation in the spleen and kidney after injection of recombinant rock bream TRx1 protein. These findings provide a molecular foundation for functional studies and applications in teleosts. © 2015 Elsevier Ltd.

Zhang M.-M.,Pukyong National University | Oh C.-W.,Pukyong National University | Lee W.-O.,Inland Fisheries Research Institute | Na J.-H.,Pukyong National University
Journal of Environmental Biology | Year: 2013

The population biology of Micropterus salmoides were examined in Goe-san Lake from March 2010 to February 2011. The development of ovary and testis was separated into 5 stages by the criteria. The ratio of females to males increased with total length. Females were sampled in slightly larger size and greater number. Mean size and age was greater for females (255 mm total length and 2.03 years, respectively) than males (227 mm and 2.44 years, respectively). Growth was described by 3 parameter von Bertalanffy model by otoliths as Lt = 459.01(l-exp[-0.126(t+0.416)]). The spawning season of M. salmoides was from April t|o June, with a peak in May by the gonadosomatic indices and the monthly proportions of female and male gonad stages. Ripe females were collected during the spawning period. Mean fecundity was 27656±1424 oocytes every female. Fecundity was positively correlated with total length, and it was described by mean fecundity 202.4 Total length - 38188. Higher fecundity well indicated that the largemouth bass has a flexible spawning strategy and has acclimatized well to Goe-san Lake. © Triveni Enterprises, Lucknow (India).

Song M.-Y.,Inland Fisheries Research Institute | Lee W.-O.,Inland Fisheries Research Institute | Kim K.-H.,Inland Fisheries Research Institute | Park Y.-S.,Kyung Hee University | Bae M.-J.,Nakdonggang National Institute of Biological Resources
Annales de Limnologie | Year: 2016

Dams can cause fragmentation of the natural structure and function of fish communities up- and downstream of the dam. In this study, we examined the effects of the Goesan Dam on the longitudinal distribution of fish in the Dal stream, using two computational methods: a self-organizing map (SOM) and spatial autocorrelation. Fish were collected at 16 different study sites in two seasons (spring and autumn). SOM classified the study sites into four clusters (1-4), reflecting differences in the longitudinal distribution patterns of fish, and the effects of the dam on fish community composition. Samples in clusters 1 and 2 mostly originated from tributaries and the upstream section of the dam, whereas samples in cluster 4 originated from downstream study sites of the dam. Cluster 3 included study sites originating directly from up- and downstream of the dam. Species turnover and spatial autocorrelation results confirmed the fish community alteration near the dam. Species turnover was the highest between study sites directly up- and downstream of the dam. The Mantel correlogram was positive when applied to short distances between the study sites. However, it was negative for the farthest distance, including sites near the dam, indicating that the dam caused significant alterations to the fish community. Overall, our results suggest that the habitat alterations (e.g., fragmentation of longitudinal gradients and disruption of flow regimes) due to dam construction have caused fragmentation of fish communities. © 2016 EDP Sciences.

Kim D.-H.,Pusan National University | Song M.-Y.,Inland Fisheries Research Institute | Chon T.-S.,Pusan National University
Annales de Limnologie | Year: 2016

Species abundance distributions (SADs) are an efficient means of assessing community structure to define macroecological states and ecological integrity in responding to environmental impacts. Rank abundance distributions of benthic macroinvertebrate communities collected from streams with different levels of pollution in Korea were obtained and used to confirm water quality classification based on empirical assessment. The pollution states were broadly divided into weak and strong pollution groups according to SAD models, log-normal distribution and geometric series, respectively. A lower γ value in the log-normal distribution also differentiated weak pollution from strong pollution. Lower coefficient variation in the SAD slopes was further suitable in dividing less and slightly polluted states within the weak pollution group. Within the strong pollution group, a mixture of log-normal distribution to geometric series separated, polluted and severely polluted states. Higher correlation coefficients were observed between γ and other water quality parameters, as well as community and biological water quality indices. Similar patterns in SADs were presented between spring and fall; however, γ values of the less polluted state differed between seasons. Overall, developing SADs of related parameters is an efficient method of addressing ecological integrity that could serve as a reference system describing anthropogenic impact in streams. © 2016 EDP Sciences.

Bae S.-H.,University of Tokyo | Kim B.-R.,Inland Fisheries Research Institute | Kang B.J.,Japan International Research Center for Agricultural science | Tsutsui N.,Japan International Research Center for Agricultural science | And 6 more authors.
Fish and Shellfish Immunology | Year: 2012

To investigate the effects of dietary β-glucan (0.5 or 1 g kg-1 diet: 0.5-BG, 1-BG) and rutin (0.5 or 1 g kg-1 diet: 0.5-RT, 1-RT) after 10 days in the absence of pathogen challenge on the immune response of Fenneropenaeus chinensis, we determined total hemocyte count (THC) and the expression of four immune-related genes in hemocytes: those for prophenoloxidase (proPO), peroxinectin (PX), lipopolysaccharide and/or β-glucan binding protein (LGBP), and c-type lectin (CL). As a prerequisite for subsequent experiments, cDNA encoding proPO of the fleshy shrimp, Fenneropenaeus chinensis (f-proPO) was obtained from hemocytes; it had a full length of 3023bp, with an open reading frame (ORF) of 2061bp, a 105-bp 5'-untranslated region, and a 906-bp 3'-untranslated region containing the poly A signal. The THCs of shrimp fed β-glucan of 1 g kg-1 diet, and rutin of 1 g kg-1 diet were significantly higher than that of the control (P < 0.05). The expression of proPO mRNA was slightly downregulated and that of LGBP mRNA was upregulated (except in 1-RT). PX and CL mRNA remained constitutively expressed in all groups. Our results reveal that β-glucan and rutin dietary supplements have minimal effect on immune response in the absence of pathogen challenge. © 2012 Elsevier Ltd.

Beon M.S.,Chonbuk National University | Oh M.K.,Chonbuk National University | Lee Y.J.,Jeonju National University of Education | Kim C.H.,Inland Fisheries Research Institute | Park J.Y.,Chonbuk National University
Journal of Applied Ichthyology | Year: 2013

Epidermal structure of the amphibious mudskipper, Scartelaos gigas (Gobiidae), was investigated in relation to their terrestrial adaptation whereby a histological study on the epidermis of 15 regions including nine body regions, five fins and the sucking disc was carried out. The structure of the epidermis consists of three layers: an outermost layer with polygonal cells or rather flattened cells, small cells and mucous cells; a thick middle layer with voluminous cells swollen by epidermal cells; and the stratum germinativum. A dermal bulge was located at each apical area of the epidermis of almost all body regions, but was not existent in the operculum and the appendages, including none of the fins or the sucking disc. In the epidermis of the body regions, the dermal bulges had numerous dermal capillaries just beneath the stratum germinativum. By contrast, the appendages never had dermal capillaries due to the absence of the dermal bulge. Based on these results, the cutaneous air uptake in S. gigas would seem to be more effective in the upper body regions that are most often exposed to air than in the lower body regions, however, cutaneous air uptake is not likely to occur in the appendages. © 2012 Blackwell Verlag GmbH.

Suk H.Y.,Yeungnam University | Chung O.-S.,Chungnam Development Institute | Lee J.-Y.,Yeungnam University | Oh K.-C.,Nakdong River Basin Environmental Office | And 2 more authors.
Animal Cells and Systems | Year: 2014

Throughout the long history of landscape ecology, scientists have devoted substantial efforts to understand potential forest patch size and isolation effects on the abundance and diversity of woodland species. Which bird species flourish or perish as a response to forest fragmentation may compose fundamental information for the reserve design and landscape management in a region. Here, we designed a bird survey of the urban forest areas in Dangjin city located on South Korea's west coast to test (1) if bird species richness follows the pattern predicted by species-area relationship and (2) if there is seasonal variation in the pattern. As expected, patch area was the most significant variable explaining patch occupancy of resident and summering woodland birds in every season. Our data about the number of dominant vegetation suggest that larger areas contain greater habitat heterogeneity and more diverse niches. About half of the resident species did not appear to be area-sensitive and were categorized as edge species. On the other hand, many summering species showed strong area-sensitivity, potentially avoiding small patches that are almost entirely edge habitats in urban landscape. Our results suggest that lots of contemporary forest edges, fragmented by agricultural or urban development, do not any more function for feeding or nesting places for those species. © 2014 © 2014 Korean Society for Integrative Biology.

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