• Journal of Environmental Health Sciences
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• v.29 no.2
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• pp.77-79
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• 2003

Seventeen metazoan parasites were recovered from Sebastes crameri collected from Newport fish market. Nine Trochopus australis and 8 Neobrachiella robusta were found on gill arches of canary rockfishes. The commonest sites of metazoan parasites were the posterodorsal region and second gill arches of Sebastes crameri. T. australis were most commonly found on the second gill arches, but in N. robusta. the first gill arches were the most frequented position. No N. robusta were discovered on the fourth gill arch. Metazoan parasites infected gill arches I, II, and posterodorsal regions of S. crameri, occurring less frequently on the gill arches III, IV anteriorventral and middle regions.

• Applied Microscopy
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• v.39 no.4
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• pp.319-324
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• 2009

Morphology of the gill in Lateolabrax japonicus was investigated after staining the gill, as a result, we found the gill is composed of gill raker, gill arch, gill filament and gill lamellae. The number of gill raker was 7~10 in the upper and 13~18 in the lower. Ultrastructure of the gill in Lateolabrax japonicus were examined by means of the light and transmission electron microscopes. The gill have primary filament and secondary filament (lamellae). The following cells are identified and described: pavement cell, pillar cell, blood cell, mucose cell and chloride cell etc. Simple epithelial layer consists of squamous epithelium contained large nucleus, intracellular organelles etc. and the surface is covered with some of microridges. The lamella pillar structures are characterized by the axial microtubules and lateral membrane interdigitations. The mucous cells were globular in shape, and had almost the mucous granules of same size with various electron density. Chloride cells contain a lot of mitochondria and specifically developed tubular systems.

• Korean Journal of Environmental Biology
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• v.21 no.2
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• pp.177-180
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• 2003

Four genera of metazoan parasites were recovered from 3 of 6 Sebastes pinniger examined during January 2003. Two hundred forty-five metazoan parasites were recovered. Trochopus trituba Sekerak and Arai, 1977 and Anisakis larvae were found to he infected S. finniger Gill and te be abundant in this rockfish. One hundred eleven worms of monogenean trematodes and 134 larval anisakine nematodes were also found in this fishes. Precise positions with regard to gills, fins, and gastrointestinal tracts were recorded on S. pinniger to determine distribution of metazoan parasites of Trochopus trituba, Anisakis simplex larva, Contracaecum sp. larva, and Pseudo terranova decipiens larva. The monogenean trematodes, T. trituba were attacked to the gill arches and fin, and the larval anisakine nematodes, A. simplex, Contracaecum sp.,and P. decipiens were found on the visceral organs such as intestine, omentum and stomach wall. The second gill arches were the most heavily infested and posterodorsal region of the gill arches contained most monegenenn trematodes. The nam site of infestation of larval anisakine nematodes were the intestine.

• Korean Journal of Ichthyology
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• v.17 no.1
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• pp.57-63
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• 2005

The digestive apparatus and food of the Korean bitterling, Acheilognathus signifer, from the upper reaches of the Hongcheon River were investigated by examining their gill rakers, pharyngeal teeth, and digestive-tube contents. Gill rakers of the first arch were relatively few (17 to 21, mean = 19) and short (mean = 0.36 mm, SD = 0.035). The 2nd to 5th pharyngeal teeth were well developed, while the first tooth was poorly developed. Gill rakers and pharyngeal teeth were completely formed early in life. The digestive tube was long and arranged in many coils. The digestive-tube contents of Korean bitterling mainly consisted of phytoplankton and detrital microorganisms.

• Korean Journal of Fisheries and Aquatic Sciences
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• v.26 no.3
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• pp.258-265
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• 1993

Monthly changes in the occurrence and infection levels of a parasitic copepod Acanthochondria yui(Poecilostomatoida, Chondracanthidae) on a gobiid fish Acanthogobius flavimanus were studied for a year from April 1990 to March 1991. This parasite was not found on the fish for four months from September to December. Prevalence of the parasite increased from $2.9\%$ in January to $88.9\%$ in June. Relative density and mean intensity also increased from January to June. Prevalence of A. yui increased with host size. A. flavimanus samples were never found carrying A. yui larvae of three copepodid stages(CI to CIII), although a few CIV and CV larvae were identified from April and May samples. This indicates that A. flavimanus was not the sole host of A. yui. Adult females and copepodites of A. yui were usually found in the gill arch($74.8\%$) and gill filament($80.6\%$), respectively. This suggests that copepodites select the gill filament as the most suitable place on their host A. flavimanus, and the adult females move toward the gill arch.

• Journal of Environmental Health Sciences
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• v.28 no.5
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• pp.102-105
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• 2002

The gills of seven black rockfish, Sebastes melanops collected from Hatfield Marine Science Center Aquarium during September 19-October 3,2001 were examined for parasites attached to the gills. The species of Sebastes melanops were Microcotyle sebastis baled on the number of clamps and testes. The prevalence of 42.9％ was recorded for host and fourteen worms of three black rockfish were recovered. Mean intensity of infection of Microcotyle sebastis individuals per infected host for black rockfish was 2.0(range 1-11). Monogenea helminth sites were mainly consist of second and third gill arch's filaments of black rockfish. The results revealed that surface area of the 2nd and 3rd pair of gills might affect the distribution of Microcotyle sebastis.

• Korean Journal of Ichthyology
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• v.22 no.2
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• pp.132-135
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• 2010

A specimen of Arnoglossus polyspilus (G$\ddot{u}$nther) (229.0 mm standard length) belonging to the family Bothidae, collect from the coastal waters of Jeju Island, represents the first record of the species from Korea. This species is characterized by having caudal fin with two simple rays on both upper and lower margins, several anterior dorsal fin rays somewhat elongated, upper jaw extending to below anterior 1/3 of lower eye, and one gill raker on the upper limb of the first gill arch. We add this species to the Korean fish fauna and propose its new Korean name, "No-rang-ban-jeom-ga-ja-mi".

• Korean Journal of Ichthyology
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• v.19 no.4
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• pp.365-370
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• 2007

Two species, Psettina tosana and Pseudorhombus oculocirris, were collected firstly off the Saryang Island, South Sea of Korea. P. tosana is clearly distinguished from its related species, P. gigantea and P. iijimae, in having 9~10 pectoral fin rays, fewer number of lateral line scales, colorless snout region, and no gill rakers on the upper limb of gill arch. P. oculocirris much differs from P. pentophthalmus in having flattish and free rays of anterior dorsal fin, lots of scales in the lateral line, and tubular anterior nostril with flap on ocular side only.

• International Journal of Naval Architecture and Ocean Engineering
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• v.8 no.3
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• pp.277-300
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• 2016

The motion of a floating body and the free surface flow are the most important design considerations for ships and offshore platforms. In the present research, a numerical method is developed to simulate the motion of a floating body and the free surface using a fixed rectilinear grid system. The governing equations are the continuity equation and Naviere-Stokes equations. The boundary of a moving body is defined by the interaction points of the body surface and the centerline of a grid. To simulate the free surface the Modified Marker-Density method is implemented. Ships advancing in regular waves, the interaction of waves by a fixed circular cylinder array and the response amplitude operators of an offshore platform are simulated and the results are compared with published research data to check the applicability. The numerical method developed in this research gives results good enough for application to the initial design stage.

• The Korean Journal of Zoology
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• v.38 no.4
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• pp.570-579
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• 1995

Ultrastructural and histochemical changes of mucous cells In the freshwater and seawater-adapted guppy (Poecflia reticulatus) gills were observed by the light, scanning-and transmisslon~lectron microscopes. The mucous cells were usually located in the epithelium of primary lameilne projected from the gill arch. The rough endoplasmic retIculum and Golgi complex were hIghly developed In immature mucous cells. The mature mucous cells were nearly filled with the mucous granules. In the freshwater guppy, the histochemical properties of the mucous cells were a mixture of the neutral mucin, sialomucin and sulfomucin. When guppy was adapted to the seawater, the content of acid glycoproteins (slalomucln and sulfomucin) was decreased. In addition, the number of mucous cells in the seawater-adapted group was less than a third of those in the freshwater one. These results suggest that the seawater-adapted guppy would react to the changed osmotic stress of the seawater. And also, the environmental change by the increased salt concentraion might lead to reduce the chance of infections.