• Korean Journal of Fisheries and Aquatic Sciences
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• v.55 no.5
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• pp.742-750
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• 2022

This study aimed to monitor the distribution of Cobitidae in Korea by the identification of species using genetic analysis. Based on the genetic analysis, Cobitidae species in four of five domestic fish farms consisted of only Chinese muddy loach Misgurnus mizolepis, but muddy loach Misgurnus anguillicaudatus was also present it in one fish farm. In the case of imported Cobitidae species, in addition to Chinese muddy loach and muddy loach, the harmful species Paramisgurnus dabryanus, was also present. Chinese muddy loach accounted for 20%, 67%, and 60% of the S6, S7, and S8 samples, respectively. An analysis of the total length, body length, and weight showed that domestic Chinese muddy loach showed higher values than imported muddy loach, and imported Chinese muddy loach showed similar values to P. dabryanus. There were no significant differences in the country of origin of the three species. Thus, the mitochondrial cytochrome c oxidase subunit I gene sequence was analyzed and compared the verification of species identification. The three species of Cobitidae were genetically divided into three groups and determined to have genetic differences. These results indicate that it is necessary to reduce the heterogeneous mixing rate through discriminating species by genetic analysis.

• Animal Systematics, Evolution and Diversity
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• v.13 no.1
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• pp.21-27
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• 1997

한국 고유종인 새코미꾸리(Cobitis rotundicaudata)의 집단간 유전적 차이에 따른 종 분화 여부를 밝히고자 4개집단을 대상으로mitochondrial DNA(mtDNA)의 RFLP분석을 실시 하였다. C. rotundicaudata mtDNA를 10개의 6-base cutting 제한요소로 처리한 다음 그 절 편 양상을 비교, 분석한 결과 4개 집단 공히 mtDNA의 전체 genome 크기는 약 16.5$\pm$ 0.5Kbp였으며 공통절편수(F)에서 한강 2개 집단(가평, 진부)과 동해안 마읍천 짐단간의 F값 은 0.911로 매우 가까웠으나 낙동강의 산청집단은 타 3개 집단과 F=0.375로 차이가 있었다. 또한 염기치환율(p)에 있어서도 한강 2개 집단 및 마읍천 집단간은 평균 p=0.005로 매우 유 사하였으나, 산청 집단은 타 집단들과 염기치환율에 있어 p=0.059로 종수준의 뚜렷한 차이 를 나타내어서 이들은 각각 별종으로 사료된다.

• Korean Journal of Ichthyology
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• v.12 no.4
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• pp.223-229
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• 2000

Phylogenetic relationships between 8 species Korean loaches (Cobitidae) were investigated by comparing mitochondrial cytochrome b gene sequences. However our results are in accordance with finding observed using other morphological studies, new interesting interspecific variation in Korean loaches were found. Orthrias and Lefua appeared to be paraphyletic in Cobitidae observed. Their sequence divergence value was agreed with interfamilic sequence divergences between Cobitidae and Cyprinidae ranged from 0.184 to 0.272. Otherwise, the present results support that two species of Iksookimia and Cobitis melanoleuca were early diverged respectively. And another remarkable result was sequence divergence between Misgurnus anguillicaudatus from China and M. anguillicaudatus from Yongdok, Korea. That was 0.099, which was interspecific value. Also the phylogenetic location of some Iksookimia species was suggested as the cobitid intergeneric hybrid origin.

• Korean Journal of Ichthyology
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• v.8 no.2
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• pp.74-83
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• 1996

The ultrastructure of the spermatozoa of the family Cobitidae, 6 genera and 12 species, was examinated under electron microscopes. Spermatozoa of the observed species consist of a head(nucleus), a short midpiece, and a single tai1(flagellum). It is of anacrosomal aquasperm type, lacking an acrosome. However, the spermatozoa of Nemacheilus toni has vestigal acrosome or acrosome-like vesicle in the anterior region of the nucleus during spermiogenesis, The nucleus of Cobitidae is approximately spherical except that N. toni is conic. The mid piece was under $3.0{\mu}m$ in length and contained 5-8 ring-shaped mitochodria. Genera Cobitis, Iksookimia, Niwaella, and Nemacheilus. have shorter midpiece, whereas Misgurnus and Lefua have longer midpiece. The flagellum was uniflagellate consisting of a typical 9+2 axoneme without fins.

• Korean Journal of Ichthyology
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• v.3 no.1
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• pp.36-41
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• 1991

The karyotype of the Niwaella multifasciata, endemic species to the Nakdong River in Korea, is reported for the first time. The sample species, Niwaella multifasciata collected from the Milyang River and the Nam River which are tributaries of the Nakdong River, has a diploid complement of 50 chromosomes composed of 10 metacentric, 28 submetacentric, 12 subtelocentric chromosomes, and 88 arm numbers. The arm number of Niwaella multifasciata was larger than any other species of Cobitidae. Sexual dimophism and intraspecific polymophism of the chromosomes were not observed in this study.

• Korean Journal of Ichthyology
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• v.24 no.3
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• pp.234-241
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• 2012

Kichulchoia brevifasciata belonging to family Cobitidae is an endemic Korean freshwater fish and restricted to very small areas such as Goheung peninsula, and Geogum Island and Geumo Island flowing into the South Sea. As a decrease of its population was further accelerated, a close investigation on the distribution was required. Among a total of 21 sites surveyed, only 5 sites were confirmed in which K. brevifasciata existed. Based on this result, we classified the 5 sites into 3 categories: Being worthy of preserved, being subject to threaten and staying in good condition.

• Animal Systematics, Evolution and Diversity
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• v.13 no.1
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• pp.29-36
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• 1997

한국산 기름종개속 어류중 Cobitis taenia complex의 집단간 유전적 차이에 따른 종 분화 여부를 밝히고자 6개 집단을 대상으로 mitochondrial DNA(mtDNA)의 RFLP분석을 실 시하였다. C. taenia complex mtDNA를 10개의 6-base cutting 제한효소로 처리한 다음 그 절편 양상을 비교, 분석한 결과 6개 집단 공히 mtDNA 의 전체 genome 크기는 약 17.0$\pm$ 0.5Kbp였으며 공동절편수(F)에서 C. t. taenia 2개집단과 C. t. stria와 C. t. lutheri 4개 집단 간의 F값은 평균 0.263으로 차이가 있었으나, C. t. striata 와 C. t. lutheri 사이는 F=0.569로 가깝게 나타났다. 염기치환율 (p)에 있어 C. t. taenia는 C. t. striata 및 C. t. lutheri와 평균 p=0.082로 뚜렷한 종간차이를 보였으나, C. t. striata와 C. t. lutheri 집단들은 p=0.033으로 매우 가까운 유사성을 나타내었다. MtDNA 분석결과 C. taenia complex 중 C. t. taenia는 완전히 종분화가 이루어진 별종으로, C. t. striata와 C. t. lutherisms 아직 종수준의 분화가 이루어지지 않은 아종으로 분류함이 타당하다고 사료된다.

• The Korean Journal of Zoology
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• v.34 no.1
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• pp.110-122
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• 1991

기름종개과의 N. toni, L. costota, N. multifasciata 3종에 대한 형태분석, 핵형분석 및 전기영동법에 의한 유전자 분석을 실시 각 종의 지리적 변이 및 계통적 유연관계를 조사하였다. 형태 측정치에 대한 discriminant 분석결과 연 yoni 월악산집단, 1. costoto 거제도집단 그리고 환multifasc지물 산철집단이 같은 종내 타 집단들과 형태상 완전히 분리 되어졌다. 핵형분석에서 N. muftifosciota와 1. costoto는 2n: 50으로 염색체수는 조사된 전 집단이 변리없이 동일하였다. N to티 삼척과 진부집단은 2n: 50으로 동일하였으나 고성집단은 2n=50, In : 48인 염색체상이 한개체에서 동시에 발견되었고, 인형성부위의 위치 및 형태가 타 집단과 차이가 있었다. 전기영동을 실시하여 총 28개의 유전자를 검출, 분석하였다. 3종중 N. multifosciata 청도집단의 유전적 변이 (HDi 123, HG : .160)가 가장 높았고, N. toni 고성집단이 가장 적었다. ( HD= .017, HG= .015). N. yoni 고성집단과 강릉집단은 각 집단의 고유한 genetic marker를 다수 갖고 있으며 타집단들과 유전적 근연관계도 매우 먼 것으로 나타나 각기 독립된 별종으로 추정된다.

• Korean Journal of Fisheries and Aquatic Sciences
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• v.55 no.1
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• pp.23-29
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• 2022

This study was carried out to clarify the egg, larvae and juveniles development of Misgurnus anguillicaudatus, and relationships of M. anguillicaudatus and M. mizolepis, Cobitididae Fishes. The adult fishes were collected in Samsan-cheon, Haenam-gun, Jeollanam-do, Korea and their spawning inducement was carried by ovaprim injections. The egg shape was circular and the size was average 1.12 mm. The eggs were hatched at 61 to 72 h after fertilization. The newly hatched larvae had an average 3.23 mm in total length (TL). At 5 days after hatching, the larvae reached to post larval stage and they were 10.3 mm in TL. At 19 days after hatching, it reached to juvenile stage and was 25.3 mm in TL. The egg size of M. anguillicaudatus was almost same as M. mizolepis but the hatching period of M. anguillicaudatus has taken longer. It was possible for interspecific distinguishability of M. anguillicaudatus and M. mizolepis when their larvae reached to juvenile stage by the development of keel-like ridges.

• The Zoological Society Korea : Newsletter
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• v.12 no.2
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• pp.83.1-83
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• 1995