• Korean Journal of Environment and Ecology
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• v.29 no.2
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• pp.210-220
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• 2015

We quantified temporal and spatial changes in the habitat for fish populations, the distribution of mandarin fish(Siniperca scherzeri) and an introduced species, largemouth bass(Micropterus salmoides) in Lake Paro and inflowing streams. The number of fish species identified in Lake Paro and the tributary streams included 10 families, 24 species and 10 families 30 species, respectively. The dominant fish species in Lake Paro were Zacco platypus, Hemibarbus labeo, Squalidus gracilis majimae, S. scherzeri and Tridentiger brevispinis, Z. platypus, Z. koreanus, and S. gracilis majimae in the inflowing streams. Although the habitat segregation for S. scherzeri and M. salmoides occurs, these two species showed the use of the fishes of the family Gobiidae as an important prey item based on IRI analysis. S. scherzeri and M. salmoides preyed mainly on T. brevispinis(67.4 %) and R. brunneus(84.0 %), respectively. The species preyed on by S. scherzeri and M. salmoides were benthic fishes that inhabit shallow water depths around the lake and have little swimming ability.

• Korean Journal of Environment and Ecology
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• v.29 no.3
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• pp.401-409
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• 2015

The fish community and introduced fish were surveyed at eight stations of Lake Soyang from March to October, 2013. A total of 41 species of twelve families were collected from the survey stations and among them, two species: Hemibarbus mylodon and Siniperca scherzeri (albino type) were identified as natural monument. There were fifteen Korean endemic species (36.6 %) including Acheilognathus yamatsutae. When compared with previous data (2003), A. yamatsutae, Pseudorasbora parva, Sarcocheilichthys nigripinnis morii, Sarcocheilichthys variegatus wakiyae, Orthrias nudus, Leiocassisuss ussuriensis, Oncorhynchus mykiss, and Micropterus salmoides appeared new in the lake. Dominant species were Hypomesus olidus (St. 1, 3, 6, 7, 8), Lepomis macrochirus (St. 2, 4) and Zacco platypus (St. 5). Of the 12 introduced species fishes in Lake Soyang, Anguilla japonica, Hemiculter eigenmanni, H. nipponensis, Rhinogobius giurinus and Tridentiger brevispinis were introduced and released from other native river water zones in Korea but Cyprinus carpio (Israeli type), Carassius cuvieri, O. mykiss, Ictalurus puntatus, L. macrochirus, and M. salmoides originated from foreign countries.

• Korean Journal of Ichthyology
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• v.17 no.1
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• pp.73-83
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• 2005

The fish fauna and the dynamics of fish community structure in Lake Uiam, Korea, were investigated from July 2003 to May 2004. During the surveyed period, 41 species belonging to 13 families were collected. There were 11 Korean endemic species (26.8%), including Rhodeusuyekii, Acheilognathus yamatsutae, Sarcocheilichthys nigripinis morii, Squalidus gracilis majimae, Squalidus japonicus coreanus, Microphysogobio yaluensis, Iksookimia koreensis, Koreocobitis rotundicaudata, Silurus microdorsalis, Liobagrus andersoni, and Odontobutis platycephala. Dominant species were Hemibarbus labeo (16.2%), Zacco platypus (13.8%), A. yamatsutae (11.8%), S. gracilis majimae (10.4%), Pungtungia herzi (5.8%), and Hypomesus olidus (4.3%). The biomass of collected fishes were H. labeo (35.9 kg), Cyprinus carpio (22.5 kg), Micropterus salmoides (5.5 kg), Lepomis macrochirus (5.2 kg), Carassius cuvieri (3.3 kg) and Z. platypus (2.4 kg). Of the 9 introduced fishes in Lake Uiam, Cyprinus carpio (Israeli type), Carassius cuvieri, Oncorhynchus mykiss irideus, Lepomis macrochirus, and Micropterus salmoides originated in foreign countries, but Anguilla japonica, Hypomesus olidus, Chaenogobius urotaenius, and Rhinogobius giurinus were introduced from other native river systems.

• Korean Journal of Ecology and Environment
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• v.46 no.4
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• pp.541-550
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• 2013

The objective of this study was to understand the distribution characteristics of largemouth bass as an exotic species in relation to water chemistry. The survey was conducted in 10 reservoirs in Korea that showed different properties in size, location and eutrophic state. Total number of fish species observed in the artificial reservoirs was 52 (13 family) and the relative abundance of the bass was 13% of the total, which is the third dominant species in the whole sample. The relative abundance of bass was the highest in the Pyungtak reservoir (60%), whereas the Daechung reservoir showed the lowest abundance (only 3%). Although no significance difference statistically were founded in the relationship between bass abundance and water quality parameters. The reservoir trophic state showed some relationships. As result, the higher abundance was observed in hypertrophic reservoirs that located in the esturine regions compared to other large and medium reservoirs classified as meso- or eutrphic state. In conclusion, bass distribution in the reservoir ecosystem can not be directly explained by water chemistry only but other environmental factors should be considered.

• Korean Journal of Environment and Ecology
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• v.32 no.3
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• pp.274-288
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• 2018

This study investigated the environmental factors and fish assemblage in 42 wetlands between spring and autumn of 2017 to evaluate the fish distribution and deduce the management strategy for improving biodiversity in created wetlands located at the Nakdong River basin. The investigation identified a total of 30 fish species and found that the most of wetlands were dominated by exotic fishes such as Micropterus salmoides and Lepomis macrochirus. Fish species such as Rhinogobius brunneus, Opsariichthys uncirostris amurensis, Zacco platypus were less abundant in the area with high density of Micropterus salmoides (static area) because they preferred the environment with active water flow. The pattern analysis of fish distribution in each wetland using the self-organizing map (SOM) showed a total of 24 variables (14 fish species and 10 environmental variables). The comparison of variables indicated that the distribution of fish species varied according to water depth and plant cover rate and was less affected by water temperature, pH, and dissolved oxygen. The plant cover rate was strongly associated with high fish density and species diversity. However, wetlands with low plant biomass had diversity and density of fish species. The results showed that the microhabitat structure, created by macrophytes, was an important factor in determining the diversity and abundance of fish communities because the different species compositions of macrophytes supported diverse fish species in these habitats. Based on the results of this study, we conclude that macrophytes are the key components of lentic freshwater ecosystem heterogeneity, and the inclusion of diverse plant species in wetland construction or restoration schemes will result in ecologically healthy food webs.

• Korean Journal of Environment and Ecology
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• v.35 no.5
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• pp.503-524
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• 2021

A largemouth bass (Micropterus salmoides) is an ecosystem disturbance fish species at the highest rank in the aquatic ecosystem, causing a serious imbalance in freshwater ecosystems. Although various attempts have been made to eradicate and control largemouth bass, no effective measures were found. Therefore, it is necessary to find an approach to maximize the effective population reduction based on the unique characteristics of largemouth bass. This study used the transcriptome analysis to derive 182,887 unigene contigs and select 12 types of final target sequences for applying the CRISPR/Cas9 system in the genes of IZUMO1 and Zona pellucida sperm-binding protein, which are proteins involved in sperm-egg recognition. After synthesizing 12 types of sgRNA capable of recognizing each target sequence, 12 types of Cas9-sgRNA ribonucleoprotein (RNP) complexes to be used in subsequent studies were prepared. This study searched the protein-coding gene of sperm-egg through the Next Generation Sequencing (NGS) and edited genes through the CRISPR/Cas9 system to induce infertile individuals that produced reproductive cells but could not form fertilized eggs. Through such a series of processes, it successfully established a composition development process for largemouth bass. It is judged that this study contributed to securing the valuable basic data for follow-up studies to verify its effect for the management of ecological disturbances without affecting the habitat of other endemic species in the same water system with the largemouth bass.

• 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 Environment and Ecology
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• v.28 no.5
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• pp.559-565
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• 2014

The fish and attached fish eggs by artificial floating island in lake Soyang was investigation from May to June 2013. The observed fish at the floating island during the survey period were Zacco platypus (5.2 %), Siniperca scherzeri (1.0 %), Lepomis macrochirus (90.8 %) and Micropterus salmoides (3.0 %) at the Cheongpyeong-ri, Cyprinus carpio (0.4 %), Z. platypus (54.6 %), L. macrochirus (20.3 %) and M. salmoides (24.7 %) at the Ungjin-ri. The collected species at the neighboring facility were 22 species belonging the seven families. Among them, exotic species such as Carassius cuvieri, L. macrochirus and M. salmoides. Also, Z. platypus (30.4 %), L. macrochirus (18.9 %), Opsariichthys uncirostris amurensis (15.4 %) and Hemibarbus labeo (9.3 %) were numberous. Attached fish eggs number were 708,800 (800 per $m^2$) at the Cheongpyeong-ri and 974,500 (1,100 per $m^2$) at the Ungjin-ri. The fish eggs number were 504,920 of the Carassius auratus (212,640 at the Cheongpyeong-ri, 292,280 at the Ungjin-ri) and 1,178,380 of the C. carpio (496,160 at the Cheongpyeong-ri, 682,220 at the Ungjin-ri). The hatched eggs number were 350,505 of the C. auratus(102,067 at the Cheongpyeong-ri, 248,438 at the Ungjin-ri) and 811,222 of the C. carpio (238,157 at the Cheongpyeong-ri, 573,065 at the Ungjin-ri).

• Korean Journal of Ichthyology
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• v.17 no.4
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• pp.271-278
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• 2005

The ichthyofauna and fish community were studied in Miho Stream from May 2004 to August 2005. During the surveyed period 41 species belonging to 10 families were collected. Twelve of the species (29.3%) are endemic to Korea. Exotic fishes were Carassius cuvieri, Lepomis macrochirus, and Micropterus salmoides. Dominant species was Zacco platypus (54.7%). Comparing the present result with that of Son (1982), the indices of diversity,evenness and richness were lower and the dominance index was higher; Lampetra reissneri, Anguilla japonica, Acheilognathus macropterus, Coreoleuciscus splendidus, Pseudopungtungia nigra, Gobiobotia naktongensis, Lefua costata, Pseudobagrus koreanus, Monopterus albus and Iksookimia choii did not appear; Carassius auratus, Rhodeus uyekii, Rhodeus notatus, Acheilognathus lanceolatus, Pseudogobio esocinus, Hemibarbus longirostris, Microphysogobio yaluensis, Cobitis lutheri, Iksookimia koreensis, Pseudobagrus fulvidraco, and Rhinogobius brunneus, remarkably decreased, and Z. platypus, Pseudorasbora parva, and Squalidus gracilis majimae increased.

• Korean Journal of Ecology and Environment
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• v.33 no.3 s.91
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• pp.274-281
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• 2000

The dynamic of fish community was investigated in the Wonju stream from March 1998 to February 1999. The collected species during the surveyed period were 24 species belonging to eight families. Eight species (33%) of them were endemic species of Korea. According to relative abundance in the studied areas, Moroco oxycephalus (30.7%), Zacco platypus (29.6%), Carassius auratus (10%), Pseudogobio esocinus (9.4%) and Rhinogobius brunneus (3.6%) dominated. Hemibarbus longirostris, Pungtungia herzi, Squalidus japonicus coreanus, Zacco temmincki, Cobitis rotundicaudata, Silurus asotus, Silurus microdorsalis and Micropterus salmoides were rare to the areas, which occupied less than 0.1% in relative abundance. Dominant species was M. oxycephalus (Kumda-ri, Kwanseol-dong, Hanggu-dong, heongyang-ri), Z. platypus (Gaeun-dong) and C. auratus (Jusan-ri). It was revealed by the analysis of community that St. 3 was the most diverse among all study stations. Coreoleuciscus splendidus and Coreopera herzi have been assumed vanished in the Wonju stream. The species occurring in suddenly decreasing trend were Microphysogobio yaluensis, Liobagrus andersoni, Cottus poecilopus and R. brunneus. The species occurring in representative increasing trend were Cyprinus carpio, C. auratus, P. esocinus, M. oxycephalus, and Z. platypus.