• Korean Journal of Ichthyology
• /
• v.7 no.1
• /
• pp.64-70
• /
• 1995

Vertical distribution of eggs and larvae of Maurolicus muelleri were studied in the south-eastern waters of Korea during 1985 and 1986. Samples were collected vertically at three different layers, 0~30 m, 30~50m and 50~100m. The densities of egg and larva were high in August. Eggs and zooplankton were abundant around the thermocline in the temperature range of $10{\sim}15^{\circ}C$ at the layers of 50 m depth in 1985, and 30~100m depth in 1986. Eggs in the cleavage stage were abundant at the layer of 50~100m depth, while those of processing embryonic body formation were tended to concentrate at the layer of 30~50m depth. The vertical distribution of each developmental stage differed according to sampling time. They were distributed uniformly at water column from 30 m to 100m depth in the midnight, but concentrated at the layer from 30 m to 50 m from dawn to sunset. Before and after midnight, eggs in the cleavage stage were most abundant. It was assumed that M. muelleri spawned at the layer of 50~100m depth around the midnight, and the eggs ascended to the layer of 30~50m depth with development.

• Korean Journal of Fisheries and Aquatic Sciences
• /
• v.33 no.3
• /
• pp.243-249
• /
• 2000

Seasonal variation in species composition and abundance of shallow water fish off Yongwon, Jinhae in the southern coast of Korea was determined by the analysis of monthly samples collected by a beach seine from January to December, 1998. Among 54 species identified, the resident species such as Favonigobius gymnauchen, Chaenogobius laevis, Pholis nebulosa and juvenile Hyporhamphus intermedius were predominated in abundance. The temporal species such as Sardinella zunasi, Leiognathus nuchalis and Takifugu niphobles were collected between April and September. Mean abundance (322 individuals/1000 $m^2$ or 806 g/1000 $m^2$) was higher than that in the shallow sand surf zone of Teachon, but lower than that in the shallow mud area of Chonsu Bay in the western coast of Korea. A large number of H. intermedius were collected in cold months between November and January. The dominant resident species began to be collected from february, and the number of species and biomass were increased until July. A small number of temporal species were collected and subsequently the abundance was low from August to October when high abundance was expected as in the other shallow waters by recruitment of a large number of juveniles of temporal species. The low abundance in these warm months seemed to be related to the water quality by weak water circulation in this shallow mud area.

• Korean Journal of Ichthyology
• /
• v.23 no.2
• /
• pp.119-127
• /
• 2011

Fish species composition in eelgrass bed of Geoje island, Korea was determined using monthly samples collected by a surf net from August 2009 to July 2010. A total of 31 species, 1,387 individuals and 4,776.5 g of fishes were collected. The dominant species were Rudarius ercodes, Gymnogobius heptacanthus, Ditrema temminckii, Takifugu niphobles, Hypodytes rubripinnis, Chaenogobius annularis, Aulichthys japonicus, Syngnathus schlegeli, Pterogobius elapoides which accounted for 89.3% of total number of individuals of fish collected. Eelgrass biomass showed a peak in August (DW 154 g/$m^2$), low values in November (DW 31 g/$m^2$) to February (DW 41 g/$m^2$), and started growing from May (DW 78 g/$m^2$). The biomass of fish increased by the catch of a large number of Gymnogobius heptacanthus, Chaenogobius annularis, Pterogobius elapoides, Rudarius ercodes and Pseudoblennius percoides in May and September when the eelgrass grew fast. Meanwhile, Syngnathus schlegeli, Urocampus nanus and Aulichthys japonicus were collected year-round with no clear relationship to the biomass of eelgrass bed.

• Journal of Food Hygiene and Safety
• /
• v.32 no.2
• /
• pp.147-153
• /
• 2017

The purpose of this study was to isolate Escherichia coli from flies and to assess pathogenic genes and antibiotic resistance of the isolates. A total of 188 flies were captured in agricultural environment including fruits farms (n = 19), fermented soybean farms (n = 9), municipal waste (n = 46), livestock farms (n = 66), slaughterhouses (n = 38), and manure ground (n = 10). E. coli isolates of captured flies were tested for pathogenic gene and antibiotic resistance using PCR methods and VITEK2 systems. As a result, E. coli from 63% (119/188) of the captured flies has been detected, and the detection rate of E. coli was the highest (89%, 31/34) in flies captured at particular slaughterhouse. Of the 34 isolates, 94% (32/34) were pathogenic gene (ST gene) positive. Twenty-six percent (31/119) of the E. coli isolates were observed being resistant to one or more antibiotics. Markedly, one of E. coli isolates from Livestock farms was resistant to 7 antibiotics including ampicillin, ampicillin/sulbactam, cefazolin, cefotaxime, gentamicin, levofloxacin, and trimethoprim/sulfamethoxazole. In addition, it was ESBL positive. The results of the present study may suggest a risk of transmission of pathogenic and antimicrobial resistant bacteria from flies to livestock environment Therefore, it may need to prevent introducing flies into the agricultural production environment for safe food production.

• Korean Journal of Fisheries and Aquatic Sciences
• /
• v.20 no.3
• /
• pp.177-184
• /
• 1987

The quantitative mechanics on the sideways walking of the crabs may provide a basic solution for entanglements of the walking legs in gillnets. The gaiting behaviour of the crabs on the flat board and the nettings 10, 16 and 23 mm in mesh size were experimented concerning about stepping positions and times in the laboratory using video set on July, 1984, It was found that the irregular movements of walking crabs in stepping positions and patterns were appeared on the nettings due to the absence of mechanical contact in spite of neural control of compensating, while on the flat surface evolved systematic leg movements. The mean stride length and walking velocity, which were increased with the carapace width on the flat board, as well as the step period and forward by backward stroke time were greater than those values on the netting, not associated with the carapace or the mesh size. Also, the step period and the Phase difference on the nettings revealed larger fluctuation than on the flat board. The joint angles of the walking legs, on the nettings in meropodite-carporodite and thorax-meropodite, which joint was varied especially up to below horizon because of the falling legs through the netting twine, were virtually wider than those on the flat substrate.

• Korean Journal of Ichthyology
• /
• v.20 no.4
• /
• pp.291-302
• /
• 2008

Seasonal variation of species composition in the coastal waters off Wangdol-cho were investigated using the catches by gill net and trammel net from 2002 to 2004. A total of 58 species was collected and classified into 15 orders and 34 families. Of the 58 species identified, Scorpaeniformes and Perciformes accounted for 62.1% of the species. 35 species in 11 orders and 22 families were collected by gill net and 51 species in 15 orders and 30 families were collected by trammel net. The number of species was high in summer and autumn and lowest in winter. Catches were correlated with sea water temperature. The numbers of individuals and their biomass were 5,295 inds. and 1,890 kg, with the highest values achieved in summer and the lowest in spring. The most dominant species were Pleurogrammus azonus and Gadus macrocephalus. The seasonal species community showed a high similarity between summer and autumn.

• Korean Journal of Ichthyology
• /
• v.19 no.2
• /
• pp.164-167
• /
• 2007

A single specimen (213.5 mm SL) of the epaullete surgeonfish, Acanthurus nigricauda Dunker and Mohr, belonging to the family Acanthuridae was collected by a set net in coastal waters of Busan, Korea. The species has a distinctive dark band above pectoral fin and on mid-lateral part of caudal peduncle. We describe this species as new to Korean fish fauna and propose its new Korean name, "Yang-jwi-dom".

• The Korean Journal of Mycology
• /
• v.8 no.2
• /
• pp.95-98
• /
• 1980

More than 100 specimens of higher fungi were collected at Mt. Mudeung area during the period of 1979 to May, 1980. These higher fungi were identified and included 2 clas­ses, 6 orders, 18 families, 32 genera and 45 species. Among them, Hygrophorus imazekii Hongo, Xeromphalina cauticinalis (Fr.) $K{\ddot{u}}hner$ et Marie, Paneolus campanulatus (L. ex Fr.) $Qu{\acute{e}}l$. and Cortinarius melliolens P.D. Orton were new to be Korea.

• Animal Systematics, Evolution and Diversity
• /
• v.7 no.2
• /
• pp.241-256
• /
• 1991

The systematic study of freshwater rotifers was conducted on the materials collected from 197 sites in South Korea. As a result, 9 species of Family Colurellidae were identified, 4 species ( 1 species and 3 subspeices) of which are new to the Korea fauna ; Courella uncinata uncinata, Squatinella rostrum rostrum, Lepadella patella patella, and L.elliptica. Total 165 species representing 13 families and 40 genera are now recorded by addign the species described in the present paper.

• Korean Journal of Ichthyology
• /
• v.12 no.2
• /
• pp.96-100
• /
• 2000

A rare species of unicornfishes, Naso lituratus (Schneider) was recently collected from coastal waters in Cheju-do, Korea. This species was described and figured as first record from Korea. A key of three species belonging to the genus Naso from Korea is presented.