• Korean Journal of Ichthyology
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• v.28 no.3
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• pp.147-155
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• 2016

This study describes the cell type, ultrastructure and histochemical characteristics as a preliminary study for the research on integument of the smooth lumpsucker, Aptocyclus ventricosus in accordance with the physiological and environmental changes using light and electron microscopes. The SEM revealed the presence of well-developed finger printing structure in the skin surface. The skin surface of the smooth lumpsucker showed an irregular folds in cross section of light microscope. Integument is composed of outer epidermal and inner dermal layer. The epidermal layer is a stratified layer composed of epithelial cells, mucous cells, vacuolar cells, and granular cells. Epithelial cells are classified into superficial, intermediated, and basal cell. The superficial cells were the squamous with well-developed microridges on the free surface, and the microridges were covered with glycocalyx. The mucous cells of unicellular gland were mainly distributed in the apical layer of epidermis and contained mucosal materials of neutral glycoprotein. The vacuolar cells of unicellular gland were mainly distributed in the mid and basal layer of epidermis. The proportion of mucous cells and vacuolar cells were $7.0({\pm}1.07)%$ and $40.6({\pm}3.31)%$ of epidermal area, respectively. The granular cells contained membrane bounded secretory granules with high electron density and developed cell organelles in the cytoplasm. The dermal layer was loose connective tissue layer and composed of mainly collagen fibers. It also contained blood vessels and chromatophores of melanophores and reflecting platelets.

• Proceedings of the Korean Aquaculture Society Conference
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• 2006.05a
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• pp.267-268
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• 2006

• Korean Journal of Fisheries and Aquatic Sciences
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• v.53 no.6
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• pp.809-815
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• 2020

The food components of the muscles and roes of the smooth lumpsucker Aptocyclus ventricosus and korai bikunin Liparis ingens from the East Sea, Korea were determined. The proximate composition of the muscles of the smooth lumpsucker was 88.35%, 8.30%, 2.24%, and 1.08% and that of the korai bikunin was 91.62%, 6.88%, 0.45%, and 1.15% of moisture, protein, lipid, and ash, respectively. The roes of the smooth lumpsucker contained 83.25%, 11.28%, 3.65%, and 1.07% moisture, protein, lipid, and ash, respectively, whereas for korai bikunin, it was 81.53%, 15.09%, 1.97%, and 1.14%, respectively. The prominent fatty acids of the muscles were 16:0, 18:0, 18:1n-9, 18:1n-7, 20:4n-6, 20:5n-3 (eicosapentaenoic acid, EPA), and 22:6n-3 (docosahexenoic acid). The prominent fatty acids of the roes were similar to those of the muscles, although showing a higher ratio of EPA than that of the muscles. The major amino acids in the muscles were glutamic acid, lysine, leucine, and arginine, whereas they were glutamic acid, aspartic acid, leucine, serine, and arginine in the roes.

• Korean Journal of Fisheries and Aquatic Sciences
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• v.47 no.6
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• pp.945-959
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• 2014

This study was conducted to provide basic data for optimal fisheries management through the accurate understanding the catches, fishing level, species composition, distribution characteristics and fisheries status of trammel net in Gangwon Province. As the results of trammel net survey, Pisces were collected 77 species, 1,983.0 kg, Crustacea 9 species, 569.0 kg, Cephalopoda 5 species, 75.3 kg, Gastropoda 12 species, 16.5 kg in the coastal waters of Sokcho and Pisces 55 species, 3,681.5 kg, Crustacea 6 species, 2,229.8 kg, Gastropoda 10 species, 72.8 kg, Cephalopoda 4 species, 10.1 kg in the coastal waters of Donghae, respectively. The catches of important species with season and depths showed that the main target species is Pleuronectidae spp. at all depth and Aptocyclus ventricosus at <100 m in Sokcho, Liparis spp. and Dasycottus setiger at 200-500 m in Donghae, respectively. The mean total length (cm) of Gadus macrocephalus and Aptocyclus ventricosus didn't appear significant difference, but the mean total length of Pleuronectidae spp., Liparis spp. and D. setiger in Donghae is bigger than in Sokcho. From the cluster and MDS analysis based on Bray-Curtis similarity matrix of fourth root transformed, catches data of dominant species in the coastal waters of Sokcho and Donghae was divided into three different groups of the demersal organisms community in 12 survey of Donghae (Group A) and Jul., Oct.-Dec. survey of Sokcho (Group B) and Jan.-Jun. and Aug.-Sep. survey of Sokcho (Group C).

• Korean Journal of Fisheries and Aquatic Sciences
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• v.20 no.2
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• pp.157-165
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• 1987

On January 16, 1986, mature adults of smooth lumpsucker, Aptocyclus ventricosus (Pallas) were collected from the coastal water of Okkye, Myongju-gun, Kangwon-do, Korea. The authors carried out artificial insemination on the boat. The eggs were incubated and the larvae were reared in laboratory. During the incubation period water temperature fluctuated between $7.5^{\circ}C$ and $21.4^{\circ}C$. The eggs of smooth lumpsucker are demersal and adhesive. The eggs diameters were varied from 2.28 to 2.36 mm. The hatching took place in ca. 725 hours after fertilization. The newly hatched larvae were 6.0-6.9 mm in total length. The features of the hatched larvae lie in the tadpole-like body form and in the well developed sucking disk, namely the ventral fins. 17 days after hatching, the larva attained 9.1 mm in total length. The gill opening retained a small opening at its upper part. Melanophores were developed on the tail. 31 days after hatching, the larva attained 10.6 mm in total length, and became juvenile. The first dorsal fin was disappeared. 105 days after hatching, the larvae attained 15.4-17.5 mm in total length.