• 한국수산과학회지
• /
• 제53권4호
• /
• pp.572-576
• /
• 2020

As grouper aquaculture production intensifies worldwide, hybrids are increasingly produced to induce heterosis of traits such as rapid growth and strong environmental adaptability. In this study, we compared the morphological characteristics of a hybrid grouper to those of its parent species Epinephelus moara and E. lanceolatus. The coefficients of external and skeletal traits evaluated using soft X-rays did not differ significantly among groups; however, several patterns were detected among measured traits. The body depth (BD), length of caudal peduncle (LCP), and pre-anal fin length (PAL) of the hybrid were the same as those of E. moara, whereas the pre-pectoral fin length (PPL) and interorbital width (IOW) of the hybrid were the same as those of E. lanceolatus. Traits that did not differ significantly among the three groups included pre-dorsal fin length (PDL), pre-ventral fin length (PVL), length of anal fin (LAF), and length of dorsal fin (LDF), whereas the depth of caudal peduncle (DCP) and snout length (SNL) showed intermediate traits, and eye diameter (ED) was significantly smaller in the hybrid. Therefore, intermediate traits such as DCP and SNL and specific traits such as ED may be used as indices for hybrid classification.

• 원예과학기술지
• /
• 제29권1호
• /
• pp.77-80
• /
• 2011

경남농업기술원 화훼연구소에서 황색 대륜계 '99-가-2'를 모본, 복색 중륜계 '99-나-3-1'을 부본으로 인공교배를 실시하여 복색 소륜계 거베라 'Sun Cap'을 육성하였다. 특성 검정 포장에 정식하여 2004년부터 2007년까지 3회에 걸쳐 생육 및 수량특성 검정을 실시하였다. 'Sun Cap'은 선명한적/황의 복색(RHS 45-B/9-A)과 녹색의 화심이 잘 조화되는 화경이 강건하고 안정된 화형의 홑꽃 소륜화이다. 년간 주당평균수량은 약 102.6본 정도이며, 평균 절화수명은 약 13.5일 정도이다.

• 한국작물학회지
• /
• 제30권2호
• /
• pp.154-157
• /
• 1985

본 시험은 6월 14 일에 4년생 인삼 식물체의 각 기관별, 10월 1 일에 6년생을 근상태별로 구분하여 호흡량을 측정하였던 바 그 결과는 다음과 같다. 1. 기관별 호흡량은 유과≒엽>화경>경≒근의 순이었다. 2. 15$^{\circ}C$~3$0^{\circ}C$ 사이에서의 기관별 호흡계수는 유과 2.39, 엽 1.75, 근 1.57, 경 1.17, 화경 1.16이었다. 3. 채굴 당시 대편삼(117$\pm$8.8g)과 소편삼(54$\pm$4.0g)간에 호흡량의 차이는 인정되지 않았다. 4. 근내 수분함량이 감소할수록 호흡량은 저하되었으며 그 정도는 소편삼에서 현저하였다. 5 . 건전삼에 비해 근적변삼에서 근호흡량이 현저히 많았다.

• 한국어류학회지
• /
• 제35권4호
• /
• pp.378-383
• /
• 2023

우리나라 전 해안을 대상으로 미끈망둑 (Luciogobius guttatus)에 대한 분류학적 재검토를 실시하였다. 그 결과 41개체 (31.3~54.4 mm SL)가 L. martellii로 분류되었다. 본 종의 형태학적 특징은 다음과 같다: 복추골 수 16개; 총 척추골 수 35~37개; 등지느러미 기저부의 길이가 미병부 상부의 길이보다 길거나 같음; 가슴지느러미 상부에 1개의 유리연조; 꼬리지느러미 끝이 하얀색인 특징이 있다. 그중에서 L. guttatus와 형태학적으로 가장 뚜렷한 차이점인 등지느러미 기저부 길이와 미병부 상부의 길이의 차이는 L. martellii의 총모식표본과도 잘 일치하였다. 본 종의 한국명으로 "검정미끈망둑"을 제안한다.

• 제어로봇시스템학회:학술대회논문집
• /
• 제어로봇시스템학회 2003년도 ICCAS
• /
• pp.1580-1586
• /
• 2003

This paper presents the design and the analysis of a "fish-like underwater robot". In order to develop swimming robot like a real fish, extensive hydrodynamic analysis were made followed by the study of biology of the fishes especially its maneuverability and propel styles. Swimming mode is achieved by mimicking fish-swimming of carangiform. This is the swimming mode of the fast motion using its tail and peduncle for propulsion. In order to generate configurations of vortices that gives efficient propulsion yawing and surging with a caudal fin has applied and in order to submerge and maintain the body balance pitching and heaving motion with a pair of pectoral fin is used. We have derived the equation of motion of PoTuna by two methods. In first method, we use the equation of motion of underwater vehicle with the potential flow theory for the power of propulsion. In second method, we apply the method of the equation of motion of UVM(Underwater Vehicle-Manipulator). Then, we compare these results.

• Animal Systematics, Evolution and Diversity
• /
• 제30권2호
• /
• pp.103-107
• /
• 2014

A new gastrotrich species of the genus Dendrodasys (Dactylopodolidae) is described on the basis of specimens collected from sublittoral fine sandy bottoms at Uljin, East Sea and at Gujwa, the northeastern coast of Jeju Island, South Korea. Dendrodasys duplus is characterized by a triangular head with lateral lobes extending outward, two pairs of pestle organs posterior to the lateral cephalic lobes, a pair of anterior adhesive tubes, the absence of dorsal, lateral and ventral adhesive tubes, large posterior adhesive tubes arising from the anterior third of the caudal peduncle, and paired testes of different lengths. The genus Dendrodasys is recorded for the first time in East Asia.

• Ocean Science Journal
• /
• 제41권3호
• /
• pp.191-193
• /
• 2006

Two specimens of Lutjanus inermis, the most unusual species of the genus in the tropical eastern Pacific region, were collected at La Ventana, Baja California Sur, Mexico in November 2005, 400 km northward from the type locality. The golden snapper can be recognized by its long anal fin, and its yellowish peduncle and caudal fin that sometimes present a reddish phase. Present it record is the first documented and verified report supported by voucher specimens of L. inermis inside the Gulf of California since its original description in the last quarter of the nineteenth century, setting the northern geographic limit to the Cortes Province.

• 한국수산과학회지
• /
• 제50권5호
• /
• pp.589-593
• /
• 2017

A single specimen of Kentrocapros flavofasciatus (measuring 145.9 mm in length) belonging to the family Aracanidae, order Tetraodontiformes, was collected for the first time in 2017 on Jeju Island, Korea. This specimen had isolated bony plates on a caudal peduncle, a carapace with six ridges, and a tail depth equal to its tail length. It is similar to K. aculeatus and K. rosapinto but differs from K. aculeatus in that its carapace is without spines; it differs from K. rosapinto in that the anterior end of its gill opening does not reach below the center of its eye. We propose new Korean names: Yug-gak-bok-gwa for the family Aracanidae, and Hwang-Jul-yug-gak-bok for the species K. flavofasciatus.

• 수산해양교육연구
• /
• 제20권1호
• /
• pp.121-126
• /
• 2008

This study presents the results of basic sighting surveys conducted for dolphin watching from 2004 to 2006 in the northeastern waters of Jeju. The sighting probability of dolphins (bottlenose dolphin, Tursiops truncatus) was 71.9% (82 sightings out of 114 surveys). The dolphin's attractive behaviors observed included leaping, tail or peduncle slapping and surfing. The findings of this study provide useful baseline data for dolphin watching in the northeastern waters of Jeju.

• Journal of Ginseng Research
• /
• 제8권1호
• /
• pp.45-56
• /
• 1984

This study was carried out to obtain the basic information on the development of flower bud and to clarify the characteristics of flower organ and flowering in Korean ginseng (Panax ginseng) and American ginseng (Panax quinquefolium). The formation of flower bud in the dormancy bud of Korean ginseng was initiated about the middle of June and completed late in September. The ovary, style and anther of Panax ginseng, violet-stem and yellow-berry variants, were formed earlier than those of Panax quinquefolium. Panax ginseng, therefore, flowered earlier by one month in comparison with Panax quinquefolium. As for the effect of temperature on the flowering of ginseng, both species, Panax ginseng and Panax quinquefolium, grown at 20 $^{\circ}C$ flowered earlier than those at 15 $^{\circ}C$ and field conditions, but did not flower at 30 $^{\circ}C$. Seed characters were better in Panax ginseng than in Panax quinquefolium and the amount of seeds showed the highly significant positive correlation coefficient with peduncle length in both Panax ginseng and Panax quinquefolium.