• Korean Journal of Ichthyology
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• v.34 no.2
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• pp.73-85
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• 2022

The cynoglossid fishes are popular for food in the world including Korea, China and Japan, and among them, Paraplagusia japonica lives all over the sea of Korea. In order to establish appropriate management measure, it is essential to clarify population structure of P. japonica from the morphological and molecular perspectives. We collected a total of 132 individuals of P. japonica from six localities in Korea between 2008 and 2021. Canonical discriminant analysis results showed that the West Sea population (Incheon) slightly differed from the South (Tongyeong, Busan) and East Sea populations (Pohang, Donghae, Sokcho). Similar results were also shown in Kruskal-Wallis test of meristic characters. Furthermore, neighbor-joining and maximum-likelihood trees based on 849 base pairs of mitochondrial DNA cytochrome b sequences showed that P. japonica was divided into two lineages (designated as A and B) with a high significance (Φ_st=0.0781, P<0.001). Interestingly, however, the two lineages in the admixture area (South-East Sea) were not different in morphological characters. Our results suggest that P. japonica had undergone differentiated history during the Late Pleistocene, but secondary contact may occur at the admixture area.

• Korean Journal of Fisheries and Aquatic Sciences
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• v.27 no.6
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• pp.803-813
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• 1994

Eight species belonging to three genera in the family Cynoglossidae of Korea are reviewed and provisional keys to species and genera are provided, with synonyms and their distribution. Among them six species collected from 1992 to 1993 are redescribed and figured in the present study; Cynoglossus interruptus, C. joyneri, C. robustus, C. semilaevis, C. abbreviatus and Paraplagusia japonica. Three species of Areliscus rhomaleus. A. trigrammus, and A. hollandi were considered as synonyms of Cynoglossus semilaevis, C. abbreviatus and C. gracilis respectively. Many tonguefishes inhabit commonly in the western and southern coast of Korea. And although Cynoglossus interruptus and C. abbreviatus are restricted only in the southern coast, C. semilaevis in the western and southwestern coast of Korea, Paraplagusia japonica occurs widely along all of the coasts of Korea.

• Animal Systematics, Evolution and Diversity
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• v.11 no.3
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• pp.329-334
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• 1995

The epicranial bony system of the six species of the family Cynoglossidae were examined based on the specimens collected from the coast of Korea from 1992 to 1994. They were divided into four groups by the morphological features of epicranial bony system as follow: 1. Paraplagusia japonica, 2. Cynoglossus joyneri and C. robustus, 3. C. semilaeuis and C. abbreuiatus, and 4. C. interruptus. Among them, P japonica showed the most derived character in the erisma and frontal elements of the epicranial bony system. And it was remarked that the number of proximal radials supporting erisma show much differences among the species. It is discussed that the morphological differences in the epicranial bony system are significant character for interspecific relationships in family Cynoglossidae.

• Korean Journal of Fisheries and Aquatic Sciences
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• v.54 no.3
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• pp.329-339
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• 2021

The monthly variation in species composition of fishes in the Gujora and Mangchi coastal waters in Geoje, Korea, was investigated between June 2018 and May 2019 through monthly fish collections using a gill net. A total of 46 species, numbering 410 individuals weighing a total of 96,645.0 g, were collected during the study period. The dominant species in terms of numbers were Chelidonichthys spinosus, Stephanolepis cirrhifer, Ditrema temmincki, Sillago japonica, Sebastes inermis, and Paraplagusia japonica. The number and biomass of fishes peaked in July. The peak in species diversity indices occurred in September. The cluster analysis revealed that there were four groups of fishes depending on the season. In addition, subtropical fishes were recorded in the study area, indicating the gradual subtropicalization of the coast of Geoje. Furthermore, the need to understand the changes in marine ecosystems owing to subtropicalization through continuous monitoring is emphasized.