• Title/Summary/Keyword: Amblycipitidae

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Morphometric Characteristics of Torrent Catfish (Amblycipitidae) in Korea (퉁가리과(Amblycipitidae) 어류 계측형질 특징)

  • Park, In-Seok;Seol, Dong-Won;Kang, Eon-Jong;Kim, Chi-Hong
    • Korean Journal of Ichthyology
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    • v.18 no.3
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    • pp.209-215
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    • 2006
  • A closely associated set of characteristics was analyzed using both classical and truss dimensions to discriminate the morphometric traits of three species of torrent catfish (Amblycipitidae) in Korea. After arcsine square root transformation, 18 measurements relative to the standard length and three measurements relative to the head length of each species of torrent catfish were compared statistically. Classical and truss dimensions of each of four morphometric traits showed higher values in the bullhead torrent catfish, Liobagrus obesus, than the Korean and south torrent catfish (L. andersoni and L. mediadiposalisa, respectively; P<0.05). Truss dimensions of three morphometric traits were higher in the bullhead and Korean torrent catfish than in the south torrent catfish (P<0.05). There were no significant differences in six morphometric traits among these Amblycipitidae. The dimensions used in this study may be useful as taxonomic indicators to discriminate species of Liobagrus in Korea.

Histological Structure of the Barbels of Liobagrus andersoni and L. obesus (Amblycipitidae: Pices) from Korea (한국산 퉁가리과 (Amblycipitidge) 어류 2종 수염의 조직 학적 구조)

  • Park, In-Seok;Seol, Dong-Won;Im, Soo-Yeon;Kim, Chi-Hong;Kang, Eon-Jon;Gong, Yong-Gun
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.39 no.4
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    • pp.338-343
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    • 2006
  • Histological observations of the barbels of torrent catfish (Amblycipitidae) in Korea are reported. The bullhead torrent catfish (Liobagrus andersoni) and Korean torrent catfish (L. obesus) have eight obvious barbels in two pairs each on the maxilla and mandible. Each barbel is composed of an epidermis, dermis, and central cartilagerod. The epidermis of the maxillary and mandibular barbels of the bullhead torrent catfish is thicker than that of the Korean torrent catfish (P<0.05) and is formed of stratified epithelium that contains many cutaneous taste buds and a few small club cells. There are many taste buds on the upper part of each barbel. The dermis consists of loose connective tissue fibers that enclose blood vessels and bundles of nerve fibers. The barbels of these fish can be categorized into stiff and flexible types and are accessory, feeding, and sensory structures. Our results validate the barbels as gustatory receptor organs for these fishes.

On the Microdistribution of Fresh-Water Fish, Coreoleuciscus splendidus(Gobioninate) from Korea (한국산(韓國産) 담수어(淡水魚), 쉬리 Coreoleuciscus splendidus의 미세분포(微細分布)에 관(關)하여)

  • Choi, Ki-Chul;Choi, Shin-Sok;Hong, Young-Pyo
    • Korean Journal of Ichthyology
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    • v.2 no.1
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    • pp.63-76
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    • 1990
  • Studies on the microdistribution, distributional aspect and affinity of Korean endemic species, SHIRl, Coreoleueiseus splendidus in th southern half of the Korean peninsula were carried out from May, 1966 to November, 1989. This species was found in 14 independent rivers and streamlets of the south Korea ; Yimjin R., Han R., Kum R., Ungchun S., Mangyung S., Dongjin R., Somjin R., Kwangyang East S., Sachun S., Gonyang S., Nakdong R., Samchukosip S., Samhwa S. of Namhae Island and Guchun S. of Geojae Islands, and were not found from Youngsan R., Ansung S. and Sabgyo S. This species was not common and independent comprising less than 25% of the total fish population in all habiting sites. Distributional zone was in the middle or upper streaches of main streams and tributaries. The average slope of distributional zone was 2.6, minimum slope was 0.29 and maximum slope was 5.56. Thirty-three species were found to occur along with this fish and 10 species of them occurred with more than 50% frequency. They were; 20 sp. of Cyprinidae, 5 sp. of Cobitidae, 1 sp. of Salmonidae, 1 sp. of Bagfridae, 1 sp. of Siluridae, 2 sp. of Amblycipitidae, of Serranidae, and 1 sp. of Eleotridae. Some species of fish appeared to have the same ecological position even though they have different distributional zones. These species were as follows; Acheilognathus signifer and A. limbata, Micriophsogobio koreensis and M. yaluensis in Cyprinidae, Cobitis koreensis, C. longicorpus, C. rotundicaudata in Cobitidae, Liobagrus andersoni and L. mediadiposalis in Amblycipitidae.

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The Nuclear DNA Content Determination of 31 Endemic Freshwater Fishes in Korea

  • Park, In-Seok
    • Development and Reproduction
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    • v.25 no.1
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    • pp.25-32
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    • 2021
  • The main purpose of the current study was to obtain nuclear DNA content data among the representatives of the families and subfamilies of 31 endemic fishes that inhabit river of Korea. DNA contents of 31 endemic species were observed to rang from 1.5 to 4.8 pg DNA/nucleus. In Cyprinidae, DNA content of Abbottina springeri (1.5±0.03 pg DNA/nucleus) was the lowest value and DNA content of Carassius cuvieri (4.5±0.32 pg DNA/nucleus) was the highest value in all experimental groups. In Cobitidae, DNA content of Iksookimia longicorpa (3.9±0.17 pg DNA/nucleus) was the highest value and DNA content of Orthrias toni (1.5±0.18 pg DNA/nucleus) was the lowest value in all experimental groups. This study provides new information for a better understanding of the process of genomic evolution in 31 endemic species in river of Korea.

Characteristics of Spawning Sites in the Natural Environment of the Korean Endemic Species, Liobagrus somjinensis (Siluriformes: Amblycipitidae) in the Yocheon (stream), Seomjingang (river), Korea (섬진강 수계 요천에 서식하는 한국고유종 섬진자가사리 Liobagrus somjinensis (Siluriformes: Amblycipitidae)의 자연산란장 특징)

  • Kim, Hyeong Su;Kim, Su Hwan;Park, Jong Young
    • Korean Journal of Ichthyology
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    • v.27 no.4
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    • pp.300-305
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    • 2015
  • The characteristics of 11 spawning sites in the natural environment of the Korean endemic species, Liobagrus somjinensis were investigated in the Yocheon (stream) of Seomjingang (river), located in Sikjeong-dong, Namwon-si, Jeollabuk-do, Korea from May to June 2015. The spawning sites had largely two parts, the upper region close to the surface of the waters and under region at bottom: the upper part was covered with a large and flat boulder over about 256 mm in size, whereas the under part consisted mainly of pebbles and sand. The large boulder put on the upper region may be seen as a bulwark for guarding eggs laid at the under (bottom) region. All the sites under the boulder showed a similar structure having a small hollow filled with an egg mass and an individual (male). The spawning bottoms left clean having no any benthic invertebrates and detritus. The egg shape was spherical, yellow and covered with a transparent membrane and the egg size was $3.31{\pm}0.15mm$ (n=30) in diameter. The development stage of each egg mass under the boulder was almost same from morula stage to formation stage of eye lens. The average number of eggs in 11 spawning sites was $121{\pm}35.5$ (84~176) and the average number of female fecundity in ovary was $143{\pm}31.3$ (110~232).

Karyotypes of Genus Liobagrus (Pisces : Amblycipitidae) in Korea (한국산(韓國産) 퉁가리속(屬) 어류(魚類)의 핵형(核型) 분석(分析))

  • Son, Yeong-Mok;Lee, Ji-Hyun
    • Korean Journal of Ichthyology
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    • v.1 no.1_2
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    • pp.64-72
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    • 1989
  • Karyological characteristics were investigated in 3 species of the genus Liobagrus from Korea. The diploid chromosome number in L. andersoni was found to be 28, with 9 pairs of metacentrics and 5 pairs of submetacentric chromosomes, and arm number (AN) was 56. L. mediadiposalis was found with 2n of 42, consisting of 13 pairs of metacentrics and 8 pairs of submetacentric chromosomes (AN=84). In the case of L. obesus 2n was 20, with 20 metacentric chromosomes (AN=40), which was the lowest among the species of the order Siluriformes. Sexual dimorphism or intraspecific polymorphism of the chromosomes was not observed in any species examined.

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Ultrastructure of Spermatozoa of the Slender Catfish, Pseudobagrus brevicorpus (Teleostei, Bagridae) with Phylogenetic Considerations (꼬치동자개 (Pseudobagrus brevicorpus) 정자의 미세구조와 계통적 고찰(경골어류, 메기목, 동자개과))

  • KIM Kgu Hwan;LEE Joon Il
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.36 no.5
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    • pp.480-485
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    • 2003
  • Morphology of the spermatozoa from the testes of the catfish (Pseudobagrus brevicorpus) was studied by transmission and scanning electron microscopy. The spermatozoa of P. brevicorpus are approximately $82.25\pm0.06\;{\mu}m$ in length and relatively simple cells composed of a spherical head, a short midpiece and a tail as in most teleost fish, The nucleus measuring about $2.00\pm0.02\;{\mu}m$ in length is depressed with a deep nuclear fossa of about $1.05\pm0.03\;{\mu}m$ in length three fifths of the nuclear length. The nuclear fossa contains the proximal and distal centrioles. The two centrioles are oriented approximately $150^{\circ}$ to each other. The mitochondria are arranged in two layers and their number is 12 or more. They are separated from the axoneme by the cytoplasmic canal. The axoneme is the 9+2 microtubular pattern and has inner but no outer dynein arms as in other bagrids. The axonemal fins were the closed to axonemal doublet 3 and 8. The axonemal fins and lost outer dynein arm are shared in Bagridae and the deep nuclear fossa is shared in Siluriformes. The axonemal fins observed in Bagridae and Amblycipitidae of Siluriformes might be the apomorphic character in Ostariophysi.

A Histological Study on the Visual Cell Layer of the Endemic Korean Species Liobagrus mediadiposalis (Pisces: Amblycipitidae)

  • Kim, Jae Goo;Park, Jong Young
    • Applied Microscopy
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    • v.47 no.4
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    • pp.238-241
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    • 2017
  • A study on the visual cell and eyeball of the endemic Korean species Liobagrus mediadiposalis was investigated by light and electron microscopes. The retina of a small and 2 mm-diameter round eye was thin, $151.0{\pm}4.0{\mu}m$ and has two visual cells, a single cone and a rod cell. The single cone cells are short and thick, $18.0{\pm}0.9{\mu}m$ in length and $5.1{\pm}0.7{\mu}m$ (n=30) in diameter, while the rod cells are longer and thinner, $54.8{\pm}2.9{\mu}m$ in length and $3.3{\pm}0.6{\mu}m$ in diameter. The cone cells are seen an irregular and random mosaic pattern, and the rod cells are also randomly situated at between cone cells. As a rare phenomenon, such structure is one of characteristics reflecting the eye of a nocturnal and bottom-dwelling freshwater fish. The ultrastructure of visual cells was observed with scanning and transmission electron microscopy, both cone and rod cells are divided into an inner segment with numerous mitochondria and an outer segment with stacks of membrane discs.

Karyotype Analysis of an Endemic Korean Torrent Catfish Liobagrus hyeongsanensis(Siluriformes: Amblycipitidae) (한국 퉁가리속 고유종 동방자가사리 Liobagrus hyeongsanensis의 핵형 분석)

  • Cho, Yun Jeong;Park, Jong Young
    • Korean Journal of Ichthyology
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    • v.29 no.2
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    • pp.89-93
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    • 2017
  • For the karyotype analysis of Liobagrus hyeongsanensis, an endemic Korean torrent catfish, ten females and five males were used from Yangbuk-myeon, Gyeongju-si, Gyeongsangbukdo, Korea. The diploid number of chromosomes was 42, and its karyotype consisted of 30 metacentrics and 12 submetacentrics; 84 FN (fundamental number), with having no polyploidy and sexual dimorphism. The chromosome number was the same as other closely-related species, L. mediadiposalis and L. somjinensis, but their karyotypes showed a clear difference by species. Such result may be related to chromosomal rearrangements by Robertsonian rearrangement with geographical isolation.

Functional Anatomy of the Olfactory Organ in the Torrent Catfish, Liobagrus somjinensis(Siluriformes, Amblycipitidae) (섬진자가사리 Liobagrus somjienesis(Siluriformes, Adrianichthyidae) 후각기관의 기능 해부학적 구조)

  • Kim, Hyun Tae;Park, Jong Young
    • Korean Journal of Ichthyology
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    • v.30 no.1
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    • pp.65-68
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    • 2018
  • The anatomical study of the olfactory organ in Liobagrus somjinensis, being related to the habitat environment and ecological habit, was carried out using a stereomicroscopy and digital camera. The paired olfactory organs are situated at the dorsal part of the snout, and consisted of two opening (anterior and posterior nostrils) and the olfactory chamber. The tubular anterior nostril is located between the tip of upper lip and the nasal barbel. The posterior nostril flat to the surface is adjacent entirely to the basement of the nasal barbel. The olfactory chamber has a rosette structure with 22~24 lamellae of linguiform, arranged transversely and radially from the medium raphe. These results may prove that L. somjinensis is dependent on olfaction, related to the hiding, the feeding and the nocturnal lifestyle in rapids.