• Korean Journal of Fisheries and Aquatic Sciences
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• v.22 no.2
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• pp.59-69
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• 1989

The goby genus Tridentiger of Korea is reviewed and keys to following four species of the genus Tridentiger are provided for T. trigenocephalus, T. obscurus, T. nudicervicus and T. brevispinis. Among them, T. brevispinis is reported for the first time from Korea with the descriptions and illustrations of other three species of this genus in this paper. The external features of T. brevispinis are very similar with those of T. obscurus, however T. brevispinis is distinguished from T. obscurus by having the shorter 3rd dorsal spine, lesser number of gill rakers and longer intestine length. T. obscurus lives in the river mouth and esturaies around the coast of Korea, while T. brevispinis is collected from only the fresh water area.

• Development and Reproduction
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• v.22 no.3
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• pp.205-212
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• 2018

This study is to observe the developmental process of the larval skeleton according to the growth of the trident goby, Tridentiger obscurus belonging to the larvae and juveniles and use it as the basic data of the taxonomic study. 8 days after hatching, the parasphenoid was ossified with an average total length of 3.62 mm, and basioccipital began to ossify. Caudal vertebrae and neural spine ossified in vertebra. 17 days after hatching, the average total length of the long hairs was 4.32 mm, pterotic and epiotic were ossified, and interhyal and subopercle were ossified. 52 days after hatching, the average total length of the juvenile was 18.2 mm, and lateral ethmoid, hypohyal ossified, vertebrae were parapophysis, and epural bone was osseous to the bone.

• Animal Systematics, Evolution and Diversity
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• v.11 no.3
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• pp.359-377
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• 1995

Morphological and isozyme analyses were used to examine closely related species of Tridentiger obscurus and \ulcorner: brevispinis, a pair of cryptic species which has intricate problem with regard to species boundary, and to clarify the taxonomic position. In this study, it was revealed from their 17 allopatric streams that there are differences of band ornamentation on the lateral side and three genetic markers between two species. However, genetic relationship between them (S = 0.813, D = 0.192) was within the intraspecific level of similarity. However, at the sympatry of two species no hybrid was found except at Bangjuk stream where the electrophoretic hybrids with slight deficiency of heterozygosity were observed. It is shown that at sympatry there is a finer microenvironmental subdivision between two species at all populations including Bangjuk stream. To manifest the extent of assortative mating, four syrnpatric subpopulations at Bangjuk stream were analyzed for departure from Hardy-Weinberg equillibrium by F-statistics. All subpopulations were deviated significantly from the expectation under random mating. The evidences presented here supports the recognition of Tridentiger obscurus and T. brevispinis as semispecies in the late stage of reproductive isolation

• The Korean Journal of Zoology
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• v.33 no.4
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• pp.402-410
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• 1990

The osteological characteristics of Mudhopper, P. cantonensis, was described and compared with its related species, Tridentiger obscurus, Synechogobius hasta and Odontogobius platycephala The skeletal structures of P. canionensis were distinctly different from those of other species in many respects: the form of the neurocranium, the pterygoid, the radial and the parhypural, the fused state between ribs and hypomerals. However, in respect of having five branchiostegals, two epurals and hypomerals, P. cantonensis were in common with T obscurus, S. hasia and O. platycephala.

• 한국수산학회:학술대회논문집
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• 2005.05a
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• pp.123-124
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• 2005

• Animal cells and systems
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• v.14 no.3
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• pp.161-167
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• 2010

This study investigated the estrogenicity of 4-nonylphenol (NP) and diethylstilbestrol (DES) in vitro during oocyte maturation in the marine fish, Tridentiger obscurus, using steroid hormone assays and GVBD assay. Vitellogenic (0.53mm diameter) and fully vitellogenic (0.75mm diameter) oocytes were in vitro exposed to NP (0.045 453.82 nM and DES (0.037 372.62 nM). In vitellogenic oocytes, 45.38 and 453.82nM NP and 3.73 372.62nM DES increas the estradiol-$17{\beta}$ (E2)/testosterone (T) ratio. In fully vitellogenic oocytes, 0.45, 45.38 and 453.82nM NP and 3.73nM DES increased E2/T. In the GVBD assay, 0.45 and 4.54nM NP and 0.037, 3.73 and 37.26nM DES inhibited GVBD. These results suggest that NP and DES have estrogen-agonistic effects in oocyte maturation in T. obscurus. In addition, NP and DES have different sensitivity according to the oocyte developmental stage, and the estrogenagonistic effects of DES were greater than were those of NP.

• Proceedings of the Zoological Society Korea Conference
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• 1996.10a
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• pp.119.1-119
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• 1996

No Abstract, See Full Text

• Development and Reproduction
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• v.10 no.1
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• pp.47-54
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• 2006

The Tridentiger obscurus were collected of Ocheon-dong and Dolsan-do in Yeosu from Apirl to July 2003, and were carried to the laboratory to investigate their development of spawning habit, egg development, larvae and juveniles. The fertilized eggs were measured $0.86{\sim}1.07{\times}0.53{\sim}0.74\;mm$ in diameter. Hatching of the embryo began about 154 hrs 40 mins after fertilization in water temperature of $18.4{\sim}23.2^{\circ}C$(mean $21.2^{\circ}C$). The newly-hatched larvae were $2.72{\sim}2.87mm$(mean 2.83mm) in total length (TL), their mouth and anus were opened, and the yolk sac was completely absorbed. At 21 days after hatching, the postlarvae were $5.32{\sim}7.23mm$(mean 6.02mm) TL, and the tip of the caudal notochord was flexed $45^{\circ}$ upward. The juveniles stage was reached when all fin-rays were formed at 45 day after hatching, and $11.62{\sim}14.32mm$(mean 13.45mm) TL.

• Korean Journal of Ichthyology
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• v.18 no.3
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• pp.184-192
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• 2006

To investigate reproductive cycle of Tridentiger obscurus in Jeju, total 408 fish were collected in brackish area (May 2004 to August 2005) and total 271 fish were collected in tidal pool (July 2004 to August 2005), respectively. Water temperature ranged $11.0{\sim}21.6^{\circ}C$ in brackish area. Water temperature of tidal pool ($11.1{\sim}24.5^{\circ}C$) in 2005 was similar to that of brackish area although it were highest $30.1{\sim}29.2^{\circ}C$ from July to August in 2004. In brackish area, female gonadosomatic index (GSI) increased in April and maintained high values from May to August. The reproductive cycle can be grouped into the following successive stages in the ovary: immature (November to May), maturing (March to September), ripe and spawning (May to September), and degenerating (July to December). In the tidal pool, female GSI rapidly increased in April and maintained high values until July in 2005. However, it has been low in July 2004 when water temperature was highest. The reproductive cycle can be grouped into the following successive stages in the ovary: immature (August to April), maturing (March to August), ripe and spawning (March to July), and degenerating (July to August 2004 and August 2005). Fecundity of mature female ranged from 1,214 to 12,109 in brackish and ranged from 2,427 to 13,892 in tidal pool area. The fecundity of fish in the tidal pool was significantly higher than that of fish in brackish area. Fecundity was correlated positively with total length and body weigh. Although the large group (> 111 mm total length) in brackish area observed only in spawning season, one in the tidal pool observed from October 2004 until next spawning season. Frequency of the large group was 0 to 12% and 11.4 to 57.9% in brackish area and tidal pool, respectively. These results were indicated that gonadal development of T. obscurus was affected to water temperature and day length.

• Korean Journal of Ichthyology
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• v.5 no.1
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• pp.41-52
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• 1993

During the investigation of fish fauna from the Kokunsan Islands off west coast of Korea from 1989 to 1993, authors confirmed 102 fish species belonging to 81 genera, 50 families and 12 orders. Of these the following 8 species were common : Herengila zunasi, Engraulis japonica, Johnius grypotus, Pholis fangi, Repomucenus ornatipinnis, Chasmichthys gulosus, Tridentiger trigonocephalus, and Cynoglossus joyneri. Of the twelve orders recognized herein, Perciformes, Scorpaeniformes and Pleuronectiformes include approximately 74% of the fish fauna in this area. The largest family is the Gobiidae representing 12 species. Pholis fangi, Repomucenus ornatipinnis, Repomucenus koreanus, Takifugu flavidus and Takifugu obscurus collected are endemic to the Yellow Sea. Fifteen specimens of an unknown Sebastes species was collected. This species resembles Sebastes hubbsi and Sebastes longispinnis, but the species differs from other sebastes species reported in Korea in the number of dorsal fin rays, lateral line pores, gill rakers and in color patterns of body sides.