• Korean Journal of Ichthyology
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• v.13 no.3
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• pp.190-194
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• 2001

Two specimens of Sardinella lemuru Bleeker, 1853 were collected for the first time from the adjacent waters of Cheju Island, Korea, in March 1997. S. lemuru is very similar to S. zunasi (Bleeker, 1854) in external features but differs in the number of anal fin rays. While S. lemuru is difficult to differentiate by color from Clupea pallasii valenciennes, 1847 the two are easily differentiated by their gill raker counts. We propose "Bali-paen-dang-i" as a new Korean name for S. lemuru.

• Korean Journal of Ichthyology
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• v.19 no.4
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• pp.286-291
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• 2007

The bitterling, Acheilognathus koreensis spermatozoon has been examined by electron microscopy. The epididymal spermatozoa of A. koreensis are representing typical characteristic of cyprinid spermatozoa including the lateral insertion of flagellum, the organization of centriolar complex in shallow nuclear fossa and the asymmetrical arrangement of mitochondria. The sperm mid-piece contains a large mitochondrion characteristic enclosed by membranous vesicles. The mitochondria aspect is different from that of other cyprinid spermatozoa, which their mitochondria have a conventional aspect and never fuse to form a mitochondrial derivative. In term of sperm evolution, the fused mitochondria are regarded as the apomorphic character in comparison with the separate mitochondria. The single mitochondrion is not found in cyprinid spermatozoon except for Rodeus and Pungtungia.

• Korean Journal of Ichthyology
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• v.32 no.1
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• pp.8-13
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• 2020

The feeding habits of oriental bonito (Sarda orientalis) were studied using 288 specimens collected in the coastal waters of Jeju Island, Korea from January to December 2015. Oriental bonito is pelagic piscivore that consumes mainly fishes especially Engraulis japonicus and Scomber japonicus. Its diet also includes small quantities euphausiids, amphipods and cephalopods. Oriental bonito showed ontogenetic changes in feeding habits. Although fishes were the primary food consumed by all size groups, the ratio of fishes was slightly increased as body size increase. There also was a significant relationships between mean prey number and weight according to size class and season.

• Applied Microscopy
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• v.48 no.1
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• pp.11-16
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• 2018

For Odontamblyopus lacepedii with small and turbid eyes, the gross structure and histology of the olfactory organ, which is important for its survival and protection of the receptor neuron in estuarial environment and its ecological habit, was investigated using a stereo, light and scanning electron microscopes. Externally, the paired olfactory organs with two nostrils are located identically on each side of the snout. These nostrils are positioned at the anterior tip of the upper lip (anterior nostril) and just below eyes covered with the epidermis (posterior nostril). Internally, this is built of an elongated olfactory chamber and two accessory nasal sacs. In histology, the olfactory chamber is elliptical in shape, and lined by the sensory epithelium and the non-sensory epithelium. The sensory epithelium of a pseudostratified layer consists of olfactory receptor neurons, supporting cells, basal cells and lymphatic cells. The non-sensory epithelium of a stratified layer has swollen stratified epithelial cells and mucous cells with acidic and neutral sulfomucin. From these results, we confirmed the olfactory organ of O. lacepedii is adapted to its ecological habit as well as its habitat with burrows at the muddy field with standing and murky waters.

• Development and Reproduction
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• v.19 no.1
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• pp.25-31
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• 2015

We have launched an investigation for Embryonic Development, Larvae and Juvenile Morphology, of Buenos aires tetra in order to build basic data of Characidae and fish seeding production. We brought 50 couples of Characidae from Bizidduck aquarium in Yeosu-si, Jeollanamdo, from Korea on March of 2015. We put them in the tetragonal glass aquarium ($50{\times}50{\times}30cm$). Breeding water temperature was $27.5{\sim}28.5^{\circ}C$ (mean $28.0{\pm}0.05^{\circ}C$) and being maintained. The shape of fertilized egg was round shape, and it was adhesive demersal egg. The egg size was 0.63~0.91 mm (mean $0.74{\pm}0.07mm$, n=20). After getting fertilized egg, the developmental stage was gastrula stage, and embryo covered almost two-thirds of Yolk. Incubation was happened after 16 hours 13 minutes from gastrula stage, and the tail of juvenile came out first with tearing egg capsule. Immediately after the incubation, prelarvae had 3.78~3.88 mm length (mean $3.84{\pm}0.04mm$, n=5), and it had no mouth and anus yet. 34 days after hatching from the incubation, juvenile had 8.63~13.1 mm (mean $10.9{\pm}1.66mm$), and it had similar silver-colored body shape with its mother.

• Animal Systematics, Evolution and Diversity
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• v.9 no.1
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• pp.25-34
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• 1993

Several osteological characters of 45 species belonging to 26 genera and 4 subfamilies in th family Gobiidae were surveyed based on 348 specimens collected from April, 1984 to September, 1992 in the southern part of Korea. The characters include the following: first dorsal-fin pterygiophore formula, vertebral number, epural number, and number of anal-fin pterygiophores anterior to the first haemal spine. The first dorsal-fin pterygiophore formula and epural number showed considerable stability at the generic level, and the apeared useful characters at the species level. Among them, the epural number used formerly to distinguish gobiid subfamilies was considered to be unimpotant taxonomic character in the classification of the subfamily Gobiinae.

• Animal Systematics, Evolution and Diversity
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• v.9 no.1
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• pp.51-59
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• 1993

A gobiid fish, Parioglossus dotui Tomiyama is described from 359 specimens collected at Cheju-do and Pusan, in August 1994 of 1986. This is the first definitive record of the species in the Korean waters. Parioglossus dotui having a small-sized body usually is found swimming in schools. The branchiostegals are 5 in number on each side. It grows up to 40mm in total length. Most of ventral fins are separated and connected with rudimentray membrane. In this species, the lateral line were indistincet or absent. The caudal fin slightly emarginates or truncates in both sexes, with a dark spot at the border of the base. It Inhabits inlet waters and estuaries of rivers. "Deungsul mang-dug" is proposed as Korean name of this species.

• Animal Systematics, Evolution and Diversity
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• v.13 no.4
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• pp.285-290
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• 1997

Two species of Sphyrna lewini (Griffith and Smith, 1834) and Alopias vulpinus (Bonnaterre, 1788) belonging to the Elasmobranchii were collected form the first time from the western coast of Korea. S. lewini is similar to S. zygaena, but differs in some morphological characters: a prominent median indentation on anterior margin of head and free rear tip of second dorsal nearly reaching upper caudal origin. a. vulpinus differs from A. pelagicus in having labial furrows, long terminal lobe and white ventral coloration extending above the pectoral fin bases.

• Korean Journal of Ichthyology
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• v.1 no.1_2
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• pp.64-72
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• 1989

Karyological characteristics were investigated in 3 species of the genus Liobagrus from Korea. The diploid chromosome number in L. andersoni was found to be 28, with 9 pairs of metacentrics and 5 pairs of submetacentric chromosomes, and arm number (AN) was 56. L. mediadiposalis was found with 2n of 42, consisting of 13 pairs of metacentrics and 8 pairs of submetacentric chromosomes (AN=84). In the case of L. obesus 2n was 20, with 20 metacentric chromosomes (AN=40), which was the lowest among the species of the order Siluriformes. Sexual dimorphism or intraspecific polymorphism of the chromosomes was not observed in any species examined.

• Korean Journal of Ichthyology
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• v.9 no.2
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• pp.174-177
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• 1997

Nine speciments of the deep-sea ophidiid fish, Tauredophidium hexii, hitherto known only from two localities in the Indian Ocean are recorded for the first time the Pacific Ocean. Although slight differences were found in the counts of caudal vertebrae, the anal fin origins in relation to vertebral number and the length of the maxilla, there were no differences between the Pacific Ocean and the Indian Ocean specimens at the species level. This species inhabits abyssal floors in the Pacific and Indian Ocean at depths of about 1500 to 2400 m.