• Proceedings of the Korean Society of Crop Science Conference
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• 1997.05a
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• pp.108-109
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• 1997

• Proceedings of the Korean Society of Crop Science Conference
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• 2001.05a
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• pp.162-163
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• 2001

• Proceedings of the Korean Society of Crop Science Conference
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• 2001.05a
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• pp.212-213
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• 2001

• Proceedings of the Malacological Society of Korea Conference
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• 2003.11a
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• pp.9-9
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• 2003

• Korean Journal of Veterinary Research
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• v.32 no.3
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• pp.451-456
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• 1992

Seventeen antiserum identified by stormont method were used for investigation of appearance type of red blood cell in Cheju horse. Phenotype $A_1$, A', Z, $ZZ_2$, C, K, $P_1$, Q, R, S, $U_2$, X and $N_1$ were classified by Hemolytic reaction and agglutination in $E_2$, H, J and $T_1$, Hokkaido horse and Thoroughbred horse were compared with the type of red blood cell. The results obtained are as follows ; 1. According to the appearance frequency of red blood cell the phenotypes could be classified by 6 groups among horses tested; I group : C, $A_1$, $ZZ_2$, $E_2$, S, Q, II : $P_1$, $U_2$, X, III : A', R, IV : $T_1$, K, V : H, J, VI, $N_1$, Z. 2. In group I the type of C, $A_1$ and $ZZ_2$ showed the Similar frequency among horses but the type of $E_2$, S and Q was lower in Cheju horse than Hokkaido and Thoroughbred horse. 3. In group II there was no differences in the type of $P_1$ and among three species, but Thoroughbred horse was lowest as 11.2 percent than Cheju and Hokkaido horse. 4. The type of $U_2$ and X were highest in Cheju and Hokkaido horse but lowest in Thoroughbred horse. 5. The type of A' and R observed higher appearance frequency in Hoklcaido horse but in the Thoroughbred and Cheju horse appearance ratio were Strikingly lowered. 6. The type of $T_1$ and K was shown higher appearance frequency in Cheju and Thoroughbred horse similarily but lowered in Hokkaido horse. 7. In group V the type of H and J showed similarily as 30 to 40 percent in Cheju and Thoroughbred but no observation in Hokkaido horse. 8. The type of $N_1$ and Z which are group VI was great difference between Cheju and Hokkaido horse but higher in Hokkaido than Cheju horse while there was no observation in thoroughbred horse.

• Journal of Embryo Transfer
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• v.22 no.2
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• pp.97-100
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• 2007

The objective of the present study was to investigate relationships between Caslick's index and fertility for different age groups of Cheju mares. Ninety-one Cheju mares were used for this study. Caslick's index was measured the effective length and angle of declination of the vulva in the mare. They were mated naturally by stallions from February to October during the years $2002{\sim}2005$. The classification used in the present study was : Group I - good conception every years, Group II - conception every other year and Group III - Barren. Younger aged group ($3{\sim}7$ years) had a lower Caslick's index (<50) compared with $8{\sim}14$ aged group and older aged group (> 15 years). In this study, Caslick's index was increasing by increasing age of Cheju horse like Thoroughbred. However, fertility was decreasing by increasing Caslick's index. Hence, there was significant association between the different Caslick's index and fertility. Further research is needed to determine relationship between different Caslick's index and endometritis.

• Korean Journal of Fisheries and Aquatic Sciences
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• v.34 no.4
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• pp.365-369
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• 2001

Streptococcus spp. of bacterial pathogen of fish were isolated from the cultured flounder (Paralichthys olivaceus) in fish farm of Jeju Island. Clinical signs of the infected flounder which are the most commons symptoms are as follows: erratic swimming, darkening of the body colour, unilateral or bilateral exophthalmia, corneal opacity, hemorrhages in the opercular and the bases of the fins, and the ulceration of the body surface. Biochemical characteristics of pathogenic fish Streptococcus spp, were gram positive, spherical form, catalase negative, oxidase negative and $\beta$-haemolytic, respectively, The viable cells counted from the tissue of the diseased flounder were the largest in the order of the ulcer, the kidney, the blood and the brain, The drugs used were ampicillin, ciprofloxacin, doxycycline, gentamycin, tetracycline, erythromycin, streptomycin and oxytetracycline, Streptococcus spp. were found to be sensitive to ampicillin, ciprofloxacin, doxycycline and gentamycin, but were resistant to tetracycline, erythromycin, streptomycin and oxytetracycline. The pathogenicity of Streptococcus spp. on the cultured flounder with an abdominal cavity injection was high. The haemolytic activity of the toxin against the sheep red blood cells reached the maximum after 30 min incubation at $37^{\circ}C$ or $50^{\circ}C$. The toxin showed highest activity at pH $5.5\sim6.5$.

• Journal of the Korean Society of Fisheries and Ocean Technology
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• v.34 no.2
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• pp.117-134
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• 1998

The study on the Assembling Mechanism of the Hairtail, Trichiurus lenpturus, at the Fishing Grounds of the Cheju Strait had been investigated by analyzing the relationship of the oceanographic conditions and the fishing ground of the Hairtail in the Cheju Strait. 1. The fishing grounds of the hairtail at the Cheju Strait are formed at the bottom of a high temperature of the tidal front at the coast. area of northern Cheju Island, the tip of the linguiform is high in salinity at the eastern and western entrances of Cheju Island, low salinity eddy on the surface and its surrounding front, various water masses in the Strait and coastal waters of the South Sea in Korea. 2. The fishing grounds of the Hairtail at the Cheju Strait begins with the sea surface temperature higher than $15^{\circ}C$ and the incoming of low salinity water now from the East China Sea. 3. Estimation of optimum temperature and salinity per season based upon analysis for relationship between temperature of water and salinity of the bottom layer and the catch is : 15.2~$16.4^{\circ}C$, 34.20~34.40${\textperthousand}$ in spring(June); 14.4~ $17.0^{\circ}C$, 33.70~34.30${\textperthousand}$ in summer(July~September); and 15.7~ $18.6^{\circ}C$, 33.70~34.50$\textperthousand$ in autumn(October~December). Hairtail are mostly caught at the Yellow Sea Warm Current and Tsushima Current with temperature over $14.5^{\circ}C$ and salinity over 33.70${\textperthousand}$ at the bottom layers of the Cheju Strait. 4. Considering the relationship between the amount of hairtail catch and the water temperature of bottom layer, when the bottom water being above $14.0^{\circ}C$ flowed into Cheju Strait through the western entrance of the strait in summer, the ca-h appears to have been abundant. In contrast, the catch has been poor when the temperature of such water was recorded to be below $13^{\circ}C$ Therefore, distribution patterns of water at the bottom layer can be used as a forecast index whether the catch of a certain year will be good or poor.

• Animal Systematics, Evolution and Diversity
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• v.5 no.1
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• pp.59-76
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• 1989

In order to carry out a systematic study of ascidians in Cheju Island, the authors identified and classified specimens collected from 11 sites around Cheju Island from December 1 1969 to January 1989. Using the information gathered from this study as well as previous s studies, the authors prepared a detailed list of the ascidians of Cheju Island. A As a result of this study, the ascidians of Cheju Island are 50 species in 10 families. Among them, 3 species (Dideηmum apersum, Didemnum translucidum, Botrylloides perspicuum) had not previously been known to exist in Korean waters. Description and drawings of these three species are presented in this report. It was also discovered that ten of the fifty species are found only in the Cheju Island area. The fifty species recorded in the Cheju Island area account for 68% of the seventy three species recorded from all Korea. Classifying them by t the temperature of the water where they are found, the authors found the following: one cold water species (2% of the total), seven cold-temperate water species (14%), thirty eight warm-temperate water species (76%) and four tropical water species (8%)

• Proceedings of the Korean Society of Developmental Biology Conference
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• 2003.10a
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• pp.64-64
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• 2003

The sex differentiation of fishes occurs under the control of genetic and various environmental factors. DM-domain containing genes are novel zinc finger transcription factors and play key roles in sex determination. In order to isolate the wrasse DMRT (wDMRT) cDNA from the protogynous wrasse (Halichoeres tenuispinnis), the wrasse testis cDNA library was screened using the $^{32}$ P-labeled PCR products, which were amplified with the degenerate primers from conserved DM-domain regions of several DMRT genes. Among a few positives obtained through screening, the full length wDMRT cDNA of 2.9kb size encoding a predicted 300 amino acid residues was isolated. The sequence analysis exhibited 60%, 43% sequence identity with rainbow trout and tilapia DMRT1, respectively. RT-PCR assay showed that wDMRT was expressed specifically in male testis. Also, wDMRT gene was strongly expressed in May during reproductive season, when the reproductivity of wrasse is most active. This results suggested that wDMRT gene function in testis differentiation The conserved DM-domain regions were amplified using PCR from DMRT genes of several species among Labridae, and their sequences were determined. The sequence of DM-domain region of Halichoeres. tenuispinis was identical to those of Pseudolabrus japonicus, Pteragogus flagellifera, and showed 94% identity with that of Halichoeres poecioptrerus.