• Journal of Life Science
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• v.17 no.8 s.88
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• pp.1104-1110
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• 2007

The number of investigated fish collected from the Andong and the Imha reservoir were 2,540 individuals 20 species belonging to 7 families, 850 individuals 11 species belonging to 4 families respectively from May 2005 to March 2006. The total number of the common 3 species individuals investigated caught from the Andong reservoir and the Imha reservoir were 486 individuals and 124 individuals respectively. The investigated individuals is similar(${\pm}2.5$ mm) to 171 individuals make a comparative study. The Opsariichthys uncirostris, Culter brevicauda, Hemiculter eigenmanni of length-weight relationship were TW = $0.00007TL^{3.0543}$, TW = $0.0000009TL^{3.3654}$, TW = $0.00000^{3.3872}$ in the Andong reservoir and TW = $0.00002TL^{2.8493}$, TW = $0.00001TL^{2.8744}$, TW = $0.000004TL^{3.1082}$ in the Imha reservoir respectively. The Condition factor(K) of the Andong reservoir showed the positive slopes in all three species and to be in a good nutrition condition; where as the condition factor(K) of the Imha reservoir showed the negative slopes in two species except in H. eigenmanni and appeared to be in a little bad nutrition condition. Relative condition factor(Kn) indicating that O. uncirostris and C. brevicauda in Andong reservoir is more rotund than ones of Imha reservoir but H. eigenmanni in the Imha reservoir is more rotund than the ones of the Andong reservoir.

• Korean Journal of Ichthyology
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• v.10 no.1
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• pp.77-86
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• 1998

The ichthyofauna and the structure of fish community were surveyed from August 1995 to October 1997 at twenty one stations in the Wicheon river which is a first tributary located at the middle reach of the Nakdong river system. During the surveyed period, 40 species belonging to ten families were collected. Of them cyprinid fish occupied 65.0% (26 species) and cobitid fish 12.5% (5 species). Sixteen species (40.0%) were known as Korean endemic species. Dominant species were Zacco temmincki (15.35%), Zacco platypus (14.12%), and Squalidus gracilis majimae (11.32%). Rare species which occupied less than 0.1% of total individuals were Cyprinus carpio, Culter brevicauda, Misgurnus mizoiepis, Cobitis rotundicaudata, Leiocassis ussuriensis, Silurus asotus, Macropodus chinensis, and Channa argus. A tendancy were shown in regional distribution that Moroco oxycephalus dominated in upper stream, Zacco temmincki, Squalidus gracilis majimae, and Niwaella multifasciata in mid - upper stream, acheilognathid fishes and Zacco temmincki in mid - lower stream, and Zacco platypus and microphysogobioid fishes in lower stream. St. 9, 10, and 11 which located in mid - reach of main stream and St. 17, 18 and 19 which located in mid - reach of the Ssanggye stream had the most stable and diverse community structure.

• Korean Journal of Ichthyology
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• v.10 no.1
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• pp.67-76
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• 1998

The ichthyofauna and the structure of fish community were surveyed from April to November 1997 at eighteen stations in the Yonggang river which is a first tributary located at the middle reach of the Nakdong river system. During the surveyed period, 32 species belonging to ten families were collected. Of them cyprinid fish occupied 53.1% (17 species) and cobitid fish 15.6% (5 species). Thirteen species (40.6%) were known as Korean endemic species. Dominant species were Zacco temmincki (32.78%) and Moroco oxycephalus (15.10%). Zacco platypus, Pungtungia herzi. Niwaella multifasciata, and Odontobutis platycephala were common species. Rare species which occupied less than 0.1% of total individuals were Lampetra reissneri, Pseudorasbora parva, Squalidus chankaensis tsuchigae, Microphysogobio koreensis, Gobiobitia naktongensis, Cobitis rotundicaudata, Nemacheilus toni, Silurus asotus, Silurus microdorsalis, Siniperca scherzeri, and Oreochromis niloticus. A tendancy were shown in regional distribution that Moroco oxycephalus dominated in upper stream, Zacco temmincki and Moroco oxycephalus in mid - upper stream, Zacco temmincki and Niwaella multifasciata in mid - lower stream, and Zacco platypus and microphysogobioid fishes in lower stream. St. 11 which located in mid- reach of Yongam stream and St. 15 and 18 which located in main stream had the most stable and diverse community structure, but St. 1, 5, and 7 were unstable and the simplest community structure.

• Korean Journal of Ecology and Environment
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• v.41 no.3
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• pp.374-381
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• 2008

Spatial and temporal changes of fish communities were studied at four study sites in the Cheonggye Stream from October 2005 to August 2006 after the rehabilitation process. During the survey period, 19 species in 6 families were sampled. Species Rhynchocypris oxycephalus and Zacco platypus were identified as dominant species. Korean endemic species such as Acheilognathus yamatsutae and Zacco koreanus were observed in the sites. Overall, species richness and abundance increased as time passes after the rehabilitation, reflecting colonization process of the fish community. Meanwhile species richness and abundance were higher at the downstream than at the upstream. Community indices such as dominant index, richness index and diversity index showed also similar spatial and temporal pattern. Nonmetric multidimensional scaling (NMDS), multivariate ordination technique, was used to analyze spatial and temporal variation of the fish communities, and the results showed spatial variation of fish communities with high species richness at downstream as well as the temporal variation of fish communities with high values of species richness and diversity index at later part of the study period, presenting colonization process of the fish community after the rehabilitation project.

• Korean Journal of Ecology and Environment
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• v.48 no.1
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• pp.38-50
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• 2015

Appearance patterns of freshwater fish were investigated in the western Demilitarized Zone (DMZ) adjacent areas near Imjin River in Gyeonggi-do, Korea, of 2014. A total of 61 species belonging to 14 families were found in the river during the survey. The dominant and subdominant species were Zacco platypus (Relative abundance, 20.3%) and Zacco koreanus (12.6%), respectively. Other abundant species include Rhinogobius brunneus (9.2%), Pungtungia herzi (4.4%), Acheilognathus yamatsutae (4.4%), and Pseudogobio esocinus (4.0%). Among the residing species, 24 species (39.3%) were endemic to Korea; and 1 species, Carassius cuvieri, was non-indigenous species. Hemibarbus mylodon is a natural monument, and Lethenteron reissneri, Acheilognathus signifer, Pseudopungtungia tenuicorpa, Gobiobotia brevibarba, G. macrocephala, and G. naktongensis are endangered species in Korea. In addition, Anguilla japonica and Plecoglossus altivelis are catadromous and amphidromous species, respectively. Among the investigated sites, the lower part of Sami Stream (St. 5, 6) and Gunnarm-dam region (St. 11, 14) are particularly valuable for the conservation of species diversity, because many fish species (33~42 species) including a natural monument and several endangered species inhabit in these regions.

• Korean Journal of Environment and Ecology
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• v.32 no.2
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• pp.154-164
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• 2018

We investigated the ichthyofauna and fish community structure of the Mudeungsan National Park, Korea from 2014 to 2016 to prepare a conservation plan. We collected 21 species of 6 families collected from 8 survey stations through skimming nets and cast nets during the period. The dominant and subdominant species were Zacco temminckii (43.0%) and Rhynchocypris oxycephalus (15.1%), respectively. The other abundant species were Z. platypus (11.2%), Pungtungia herzi (10.1%), Squalidus gracilis majimae (8.9%), and Z. koreanus (4.5%). Among the fish collection, 13 species (61.9%) were Korean endemic species, but, endangered species and exotic species were not found. Similarity indices based on species composition and abundance showed the clear division of the fish community into two river systems (Yongsan River drainage system (St. 1-7) and Seomjin River drainage system (St. 8)). The Youngsan River system was further divided into the uppermost (St. 1, 2, 4, 6, and 7) and the upper-middle (St. 3 and 5) regions. The number of species appearing in a year was similar at 19 to 20 throughout the survey period. However, the individual number of fish in 2015 (2,670) was 20% less than that of 2014 (3,366) and 2016 (3,429), respectively. The probable reason for this decline is the rapid decline of stream level in 2015 compared to the other years. During the survey period, river works were undergoing at 3 out of 8 stations, having created disturbance in fish habitat and especially impacted on benthic fishes.

• Korean Journal of Environment and Ecology
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• v.27 no.4
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• pp.437-448
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• 2013

The ichthyofauna and fish community were studied in Daecheon Stream from April to October 2012. During the survey period a total of 42 species belonging to 13 families were collected. Dominant species by number was Zacco platypus(32.3%) and Tridentiger brevispinis(12.8%). In biomass, the dominant species was Z. platypus(27.7%) and Chelon haematocheilus(11.9%). Also, eight Korean endemic fish species and one endangered species (Rhodeus pseudosericeus) were collected. In addition, two exotic species(Carassius cuvieri and Micropterus salmoides) and migration fish species(Anguila japonica) were observed. Based on the length-weight relationship of Z. platypus, the b value was 3.21~3.29, and the condition factor(K) was 0.89 on average with stable condition. According to similarity analysis, fish communities in Daecheon Stream were divided into three groups; the upper reaches near a reservoir(St. 1), the middle reaches (St. 2 to 4) and the lower reaches near a weir(St. 5). Dominant species at each group were Zacco koreanus(St. 1), Z. platypus(St. 2 to 4) and T. brevispinis(St. 5). This result suggested that artificial structures such as dam and a weir have a marked effect on the distribution of fish communities in Daecheon Stream.

• Korean Journal of Ichthyology
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• v.19 no.3
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• pp.225-235
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• 2007

The freshwater fish fauna and physical characteristics of streams in Yeosu peninsula and Geumo Islands were surveyed at thirty nine stations in the period of 2003 and 2005. Most of the streams were short in length and narrow in flowing water width. Main materials of riverbed in most stations were cobble, pebble and gravel; those in the stations adjacent river mouth gravel and sand. In the river type, eighteen stations out of surveyed stations were upstream type: Aa. Thirty nine fish species belonging sixteen families were caught in this survey region. Among them twenty seven species were primary freshwater fishes and nine were peripheral. In the species composition of each family, there were the most species in Cyprinidae and Gobiidae, twelve and ten species, respectively. Endemic species of Korean peninsula in this region were eight species. One exotic fish species, Lepomis macrochirus was found in Yeosu peninsula. Dominant species in each district was Zacco temminckii in Yeosu peninsula, Rhinogobius brunneus in Dolsan Island, Leucopsarion petersii in Geumo island and Oryzias latipes in Gae island. In the analysis of community structure, it was appeared that the community of Yeosu peninsula was the most diverse and stable in this region; as the size of island became smaller, diversity and richness of community decreased. Kichulchoia brevifasciata did not caught in this survey, and it is possible that the species was extincted in this island. Acanthorhodeus gracilis and L. petersii were reported firstly in this region.

• Korean Journal of Ecology and Environment
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• v.54 no.2
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• pp.96-101
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• 2021

In this study, we wanted to obtain the information of the ecological impact of alien species on native fish communities. The Ichthyofauna and fish community in Joongchosan Reservoir and Bukchosan Reservoir in Gunsan-si Korea were investigated over the period from March to October 2020. During the survey period, a total of 1,895 individuals representing eight species, five families, and four orders were caught in the Joongchosan Reservoir. In the Bukchosan Reservoir, a total of 171 individuals were caught, representing seven species, five families, and three orders. The dominant species and subdominant species of Joongchosan Reservoir were Pseudorasvora parva (661 individuals, RA: 34.7%), and Rhodeus ocellatus (660 individuals, RA: 34.7%). Conversely, Micropterus salmoides (77 individuals, RA: 45.0%), and Carassius auratus (60 individuals, RA: 35.1%), were the two most common species in the Bukchosan Reservoir. The community indices showed a dominance of 0.697, diversity of 1.483, evenness of 0.713, and species richness of 0.928 in the Joongchosan Reservoir. In comparison, the community indices in the Bukchosan Reservoir showed a dominance of 0.801, diversity of 1.304, evenness of 0.670, and species richness of 1.167. This study confirms that the number of native fishes and the associated community diversity have decreased due to the influence of Micropterus salmoides. This highlights the need for removal of alien species from reservoirs, while simultaneously preventing future introductions.

• Korean Journal of Ichthyology
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• v.35 no.4
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• pp.270-277
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• 2023

Since its introduction in 1973, the bass, Micropterus salmoides, has spread to dams and rivers in Korea, adversely affecting native fish communities. In this study, after complete removal of bass from Bukchosan Reservoir, an farm reservoir that has lost its function, an attempt was made to indirectly confirm the adverse effects of bass on fish by comparing fish communities in reservoirs of a similar size where bass inhabit. The study was conducted three times a year from 2019 to 2022. As a result of the study, in Bukchosan Reservoir, where the species composition of fish was judged to be simplified due to the habitat of bass, only four species such as Carassius auratus and Rhinogobius brunneus that could be used as a food source for bass appeared before the removal of bass, but after the removal of bass. The appearance and increase of the population of the introduced small freshwater fish (Oryzias sinensis, Rhinogobius giurinus) were confirmed. When comparing Gangjeong Reservoir, Susim Reservoir, which are other reservoirs inhabited by bass investigated in this study, and Bukchosan Reservoir, this result is judged to show a trend of stabilization and recovery of fish species after removal of bass in small reservoirs with high predation pressure of bass.