• 한국수산과학회지
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• 제56권6호
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• pp.916-922
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• 2023

An abnormal shape of Bathyraja brachyurops was first reported from the catch of a bottom trawl in the southwest Atlantic Ocean in June 2022. Both pectoral fins of the specimen did not fuse with the head, resulting in a horn-like structure separated from the sides of the eyes. Analysis of mitochondrial DNA cytochrome c oxidase subunit I sequences showed that our specimen was perfectly matched to Bathyraja brachyurops registered with the National Center for Biotechnology Information. Our specimen possessed the following morphological features: a pair of flexible but elongated and pointed horns on the head; rough dorsal disc, densely covered with numerous small denticles on the head, anterior margin of pectoral fins and median line of the disc; a thorn between the first and second dorsal fins; and a pair of large ocelli at the base of pectoral fins. Unlike the normal B. brachyurops, our specimen had a slender clasper and no nuchal thorns, which may be related to the morphological abnormality. The horn-like structure on the head may be owing to the lack of fusion between the pectoral fins and head during early embryonic development.

• 한국전산유체공학회:학술대회논문집
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• 한국전산유체공학회 2008년도 춘계학술대회논문집
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• pp.97-100
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• 2008

Various flyers in nature have attracted great interests with a recent need for developing versatile and small-size flight vehicles. In the present study, we focus on the flying fish which has been observed to glide a long distance just above a seawater surface. Since previous studies have depended on the field observation or measurement of the physical parameters only, quantitative data of the flying fish flight has not been provided so far. Therefore, we evaluate the wing performance of the flying fish in gliding flight by directly measuring the lift, drag and pitching moment on real flying fish models (Cypselurus hiraii) in a wind tunnel. In addition, we investigate the roles of wing morphology like the enlarged pectoral and pelvic fins, and lateral dihedral angle of pectoral fins. With both the pectoral and pelvic fins spread, the lift-to-drag ratio is larger and the longitudinal static stability is enhanced than those with the pelvic fins folded. From the glide polar, we find that the wing performance of flying fish is equivalent to those of medium-size birds like the petrel, hawk and wood duck. Finally, we examine the effect of water surface underneath the flying fish and find that the water surface reduces the drag and increases the lift-to-drag ratio.

• 환경생물
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• 제20권4호
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• pp.300-302
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• 2002

The occurrence and infection level of parasitic Copepod, Clavella adunca on the black rockfish, Sebastes melanops at the Hatfield Marine Science Center Aquarium were studied. C. adunca was usually found on the base of fins, preferably on the pectoral fins. Seven specimens of black rockfish, Sebastes melanops were collected from Oregon Coast Aquarium. Copepods of ten Clavella adunca were present as ectoparasites attached to the fins in the black rockfish. The prevalence and relative density of Clavella adunca were 28.6% and 1.4 respectively. It is considered that the tissue of the fin membrane offers the most favorable conditions toy the attachment of C. adunca.

• 한국어류학회지
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• 제20권3호
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• pp.233-235
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• 2008

가슴지느러미에 골질반을 가지고 있는 왕종개 암컷 1개체(전장 123.2 mm)가 2008년 5월 5일 회야강에서 채집되었다. 이 암컷은 정상적인 암컷과 마찬가지로 성숙한 난소를 가지고 있었으나 가슴지느러미는 정상적인 다른 암컷보다는 큰 반면에 정상적인 다른 수컷보다는 작았고, 골질반은 다른 정상 수컷의 골질반과 유사하였지만 미약한 발달을 보였다. 난소는 포란수 3,148개, 난경 $1.26{\pm}0.11mm$의 성숙한 알을 가지고 있었다.

• 한국정밀공학회지
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• 제33권7호
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• pp.571-577
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• 2016

In this paper, we propose a novel propulsion method for a Biomimetic underwater robot, which is a bio-inspired approach. The proposed propulsion method mimics the pectoral fins of a real fish. Pectoral fins of real fish are able to propel and change direction. We designed the propulsion mechanism of 1 D.O.F. that has two functions (propel and change direction). We named this propulsion system 'Flipper'. The proposed propulsion method can control forward, pitch and yaw motion using the Flipper. We made an experimental underwater robot system and verified the proposed propulsion method. We measured its maximum speed and turning motion using an experimental underwater robot system. We also analyzed the thrust force from the maximum speed, using the thrust equation. Experimental results showed that our propulsion method enabled the thrust system of the biomimetic robot.

• Animal Systematics, Evolution and Diversity
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• 제28권4호
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• pp.308-311
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• 2012

A single specimen (134.3 mm standard length) of a snailfish, Careproctus notosaikaiensis was collected from a fish trap in Goseong-gun, Gangwon-do, East Sea, Korea. It is characterized by having the teeth strongly trilobed; dorsal fin rays 52; anal fin rays 47; pectoral fin rays 35; caudal fin rays 10; vertebrae 58; ribs 2 pairs; cephalic pores, 2-6-7-2; gill slit extending to the fifth pectoral fin ray; chin pores paired and equal in size; dorsal and anal fins with distinct reddish margins. We describe this species as the first record to Korea, and proposed the new Korean name, "Dong-hae-bun-hong-ggom-chi" for this species.

• Ocean Science Journal
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• 제41권4호
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• pp.207-210
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• 2006

Leptocephali of the genus Saurenchelys in the family Nettastomatidae were collected from the coastal area of Pohang, Korea and described as the first record from Korean waters. S. stylura and S. lateromaculatus are characterized by two intestinal swellings, the pattern of pigments in the notochord, and by smaller pectoral fins than those of other genus. They are very similar to each other but they are distinguished by the pattern of pigments in the notochord and the intestinal swellings.

• 한국동물학회지
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• 제11권1호
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• pp.1-4
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• 1968

1. Lamprotula coreana 가 棲息하는 現地에서는 體長 2-4cm 되는 피라미의 稚魚에서 만 本種의 幼生이 附着하고 있는 것을 觀察할 수 있었다. 2. 本種의 幼生의 魚體附着은 4月初에 이루어짐을 알았다. 3. 피라미의 個體當 幼生附着數는 1.6이었다. 4. 附着된 幼生은 4月末에서 5月初에 걸쳐서 完全히 脫落되었다. 5. 放出된 幼生은 大部分이 지느러미에 附着디며 少數는 눈, 코, 입, 아가미 等에도 附着한다는 事實을 밝혔다. 6. 幼生이 가장 많이 붙는 部位눈 魚體의 꼬리지느러미이었고 다음이 가슴지느러미이었다.

• 한국발생생물학회지:발생과생식
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• 제18권3호
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• pp.173-178
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• 2014

In order to monitor the developmental features of embryos, larvae, and juveniles of Oryzias latipes (Temminck and Schlegel), Oryzias latipes was caught in river of Shinduck-dong, Yeosu-si, Jeollanam-do, on May 2011, and experiments were carried out in Ichthyology laboratory at Chonnam National University. The blastodisc step was the first level for natural spawning. The optic vesicle, Kupffer's vesicle, myotome began to appear 75 hours 57 minutes later. After blastodisc development, the pectoral fins were made at 143 hours 37 minutes and the tail was separated started at the same time. Hatching was observed at 167 hours 27 minutes after blastodisc. The total length of the hatched larvae was 4.95~5.10 mm (mean, 5.01 mm), the mouth and anus were opened. Larvae used yolk completely after 3 days after hatching. The total length larvae was 5.45~5.56 mm (mean, 5.52 mm) after 8 days after hatching, and appeared the stems for tail. The stems pectoral, anal fin were showed after 14 days and the stems dorsal, ventral fin were appeared after 19 days. For 35 days after hatching, the total length of larvae 13.95~15.30 mm (mean, 14.64 mm), and at this time, fins and body were transferred like the adult Oryzias latipes.

• 한국어류학회지
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• 제8권2호
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• pp.23-32
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• 1996

1993년 4월부터 1994년 8월까지 우리나라의 제주도와 남해안 등지에서 채집된 자리돔속 Chromis 어류 3종, 자리돔 Chromis notata 연무자리돔 Chromis fumea 노랑자리돔 Chromis anlis에 대한 외부형태학적 검토 및 검색표를 제시하였다. 노랑자리돔은 체장에 대한 체고의 비가 자리돔과 연무자리돔에 비해 크며, 자리돔은 채집지역에 따른 형태적 변이를 보였는데 제주도에서 북쪽으로 갈수록 가슴지느러미 기저의 흑색 무늬가 삼각형에서 원형으로 되며 배지느러미의 길이는 더욱 짧아졌다. 연무자리돔은 자리돔과 가슴지느러미 기저의 흑색 무늬의 유무, 전새개골의 형태에서 서로 달랐다. 본 조사에서 자리돔은 남해안 및 제주도에 걸쳐 광범위하게 서식하며, 노랑자리 돔과 연무자리돔은 제주도에만 서식하였다.