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http://dx.doi.org/10.3796/KSFT.2015.51.4.527

Distribution and morphological development of a Gnathophis nystromi (Congridae: Anguilliformes) leptocephalus collected from southeastern waters of Jeju Island  

JI, Hwan-Sung (Fisheries Resources Management Division, National Fisheries Research and Development Institute)
CHOI, Jung Hwa (Southeast Fisheries Research Institute, National Fisheries Research and Development Institute)
YOON, Sang Chul (Dokdo Fisheries Research Center, East Sea Fisheries Research Institute, National Fisheries Research and Development Institute)
JOO, Hyeong Woon (Fisheries Resources Management Division, National Fisheries Research and Development Institute)
Publication Information
Journal of the Korean Society of Fisheries and Ocean Technology / v.51, no.4, 2015 , pp. 527-534 More about this Journal
Abstract
The twenty six specimens of leptocephali (15.8-32.6 mm TL) of the family Congridae, collected from southeastern waters offshore of Jeju Island during August 2014, and were identified by means of morphology and genetics. Those specimens were identified as belonging to the family Congridae based on various combinations of morphological characters. An analysis of the partial 12S rRNA sequences (886 base pairs) of mitochondrial DNA showed that our specimens must be Gnathophis nystromi, because their sequences were concordant with those of G. nystromi adult (genetic distance= 0.001), furthermore their total myomeres being consistent with those of G. nystromi adult. Catch rates of G. nystromi leptocephali were higher in the offshore regions than coastal regions of Jeju Island. The smallest leptocephali (< 20 mm TL) were collected offshore from Jeju Island. We hypothesize that one of the spawning grounds of G. nystromi is located offshore in the Jeju Island. In conclusion, the hatched preleptocephali of G. nystromi might have been transported from offshore near Jeju Island to the Korea Strait by the Kuroshio Current and Tsushima Warm Current.
Keywords
Gnathophis nystromi; Leptocephalus; Catch rate; morphology; Spawning ground;
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