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Gonadal Development and Reproduction in the Trumpet Shell, Charonia sauliae
강경호,김재민,선승찬,김현정,Kang, Kyoung-Ho,Kim, Jae-Min,Seon, Seung-Cheon,Zhuo, Liang Liang,Lim, Sang-Min,Kim, Hyeon-Jeong The Malacological Society of Korea 2009 The Korean Journal of Malacology Vol.25 No.1
This study devised and tested a histological staging system for gonadal development in the trumpet shell, Charonia sauliae, which was collected along the south coast of Jeju Island, South Korea. This paper details for the first time the gonadal development characteristics of C. sauliae. Ovary and testis development in C. sauliae can be roughly divided into five stages: growing, mature, spent, degenerative, and resting. The trumpet shelll has multiple fecundation and fertilization during the spawning season for out-of-step gonadal development in high-temperature and low-salinity environments. Female trumpet shell tended to have larger shells and were more abundant than males (64.26% of all animals collected were female).
실험실 사육에 의한 두토막눈썹참갯지렁이, Perinereis aibuhitensis(Grube)의 저질 선택성과 굴의 형태
강경호,이재학,유성규,장영진,KANG Kyoung Ho,LEE Jae-Hac,YOO Sung Kyoo,CHANG Young Jin 한국수산과학회 1997 한국수산과학회지 Vol.30 No.4
한국산 갯지렁이류 중에서 산업적으로 가장 중요한 청충의 양식기법 개발에 관한 기초자료를 얻기 위하여, 청충의 서식생태에 관하여 조사한 결과는 다음과 같다. 1. 청충은 입경이 0.10mm 이하인 저질에서 가장 좋은 일간 성장률과 생존율을 보였다. 2. 유리 수조 실험 결과, 청충이 저질 속에 잠입하여 만든 굴의 형태는 J형, L형, O형, S형, Y형 및 I형 등이 었고, 한 개의 굴에 한 개체가 서식하는 것이 일반적이었으며, 배설시 청충의 체위는 굴 속에서 두부와 미부를서로 반전하여 항문을 굴밖의 저질 표면에 노출 시킨채로 배설하였다. 3. 청충이 저질속에 잠입하는 깊이는 10cm 전후의 저질이며, 먹이를 먹기 위해서는 굴 밖으로 몸체를 완전히 이탈하여 이동하였다. In order to obtain the basic knowledges for the effective seed production of Perinereis aibuhitensis, sediment preference, burrow shape and behavior with in burrow were investigated in the laboratory. The highest value in both sediment preference and survival rate of P. aibuhitensis were shown at fine sand below 0.10 mm in the mean diameter. The worm made various types of burrows, such as J, L, O, Y and I shapes. Generally, only one individual inhabits in a burrow with head-up, but when excreting, it positions up-side down.
강경호,손승찬,김재민,김현정,Kang, Kyoung-Ho,Seon, Seung-Cheon,Kim, Jae-Min,Zhuo, Liang Liang,Lim, Sang-Min,Kim, Hyeon-Jeong The Malacological Society of Korea 2009 The Korean Journal of Malacology Vol.25 No.1
The trumpet shell Charonia sauliae is an endangered and valuable species with potential for aquaculture. For artificial propagation of C. sauliae, the effects of three different food microalgae on the development, growth, and survival rate of the larvae and spat were investigated. For the larval feeding experiments, we utilized six microalgae species as food sources, namely Pavlova lutheri, Tetraselmis suecica, Nannochloris oculata, Isochrysis galbana, Chaetoceros calcitrans, and Phaeodactylum tricornutum; for the larval and spat growth and survival experiments, we utilized T. suecica, C. calcitrans, and P. tricornutum. The results showed that the temporal digestion index (TDI) for the veliger larvae was significantly different for C. sauliae fed the different microalgae species (p < 0.05), that the T. suecica, C. calcitrans, and P. tricornutum cultivars were better suited for larval consumption (p < 0.05), and that the growth and survival of the larvae and spat were significantly influenced by food type, specifically P. tricornutum (p < 0.05). Further research is needed to evaluate the effects of other microalgae species, different algal concentrations, and biochemical composition on the growth and survival of C. sauliae.
Influence of Water Temperature and Salinity on Sand Ejection of Manila Clam, Ruditapes philippinarum
강경호,김재민,김영훈,Kang, Kyoung-Ho,Kim, Jae-Min,Kim, Young-Hun 한국패류학회 2005 The Korean Journal of Malacology Vol.21 No.1
In this study, the influence of water temperature and salinity on sand ejection of Manila clams, Ruditapes philippinarum, was investigated. The result showed that, under different water temperature, the highest quantity of sand ejection was at $20^{\circ}C$, the value of which was 0.091 g, while the smallest one was only 0.058 g at 0$^{\circ}C$. The highest releasing rate, 95.79%, could be seen in $20^{\circ}C$ group, while $0^{\circ}C$ group was the lowest one, 85.29%. Under different salinity, 30 psu group had the highest value, 0.057 g, and 0 psu (freshwater) group was the lowest one, only 0.026 g. At the same time, the highest releasing rate appeared at 25 psu, which was 90%. 0 psu group was the lowest one in releasing rate, 60.47%. According to these results, we recommend that the clams should be placed into the clear seawater with about 25 psu of salinity at near $20^{\circ}C$ to let the clams perform the self-depuration. Better quality of clams containing less impurity in the aquaculture and commerce could be obtained from this pre-treatment.
강경호(Kyoung-Ho Kang),윤병조(Byung-Jo Yun),어동진(Dong-Jun Euh),백원필(Won-Pil Baek),유선봉(Sun-Bong Yu) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
An advanced flow meter applicable to large diameter piping system was developed using the average BDFT(Bidirectional Flow Tube). This flow meter can be used to measure the flow rate of discharged gas having fine floating particles in the stack of the chemical reactor and the large-sized boiler. Also it can be applied to the large-sized industrial piping system having flow of oil without structural instability. As a first step of commercialization, we designed and manufactured the flow meters which are applicable to piping system having diameter of 200㎜ and 500㎜. The calibration test results indicated that this flow meter has linaerity within 0.5% in the Re number range of above 10,000 where is meaningful in terms of application.
가리비, Patinopecten yessoensis 유생사육 및 치패의 성장
강경호(Kyoung Ho Kang),김재민(Jae Min Kim) 전남대학교 수산과학연구소 1999 수산과학연구소논문집 Vol.8 No.-
In order to obtain the basic for the effective seed production in scallop, Patinopecten yessoensis, rearing experiments of the scallop larvae and spat were studied under the laboratory conditions. As feed of scallop larvae and spat, yellow-brown flagellate, Chaetoceros simples var. calcitrans, one of excellent food organisms was cultured under continuous illumination with 3000 lux and 20±1℃. In 7 hours after fertilization, the first cleavage was initiated and Trochophore larvae appeared after 24 hours. About 0.7% of the D-shaped larvae survival into the attachment spat.