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Myoung J.-G.,Tong Yeong Marine Living Resources Research and Conservation Center | Myoung S.H.,Pukyong National University | Hwang I.-S.,Korea Marine Environment Management Corporation | Kim B.-I.,Pacific Diving School | Kim J.-K.,Pukyong National University
Ocean Science Journal | Year: 2014

Two specimens of Valenciennea helsdingenii and one specimen of Chromis margaritifer were collected on scuba in October 2011 from Jeju Island, Korea. V. helsdingenii is characterized by a body with two dark stripes that connect the head and caudal fin, and a large dark spot between the third and sixth dorsal fin spines. C. margaritifer is characterized by a body that is dark brown anteriorly but white posteriorly at the boundary between the fifth dorsal fin soft ray and the ninth anal fin soft ray. The Korean name 'Bok-gi-mang-duk-sok' is proposed for the genus Valenciennea, the name 'Du-jul-bok-gi-mang-duk' is proposed for the species V. helsdingenii, and the name 'Huinggo-ri-ja-ri-dom' is proposed for C. margaritifer. © 2014 Korea Ocean Research & Development Institute (KORDI) and the Korean Society of Oceanography (KSO) and Springer Science+Business Media Dordrecht.


Oh S.-Y.,Tong Yeong Marine Living Resources Research and Conservation Center | Oh S.-Y.,Korean University of Science and Technology | Kim C.-K.,Marine Ecosystem Research Division | Jang Y.-S.,East Sea Research Institute | And 2 more authors.
Ocean and Polar Research | Year: 2014

The effect of salinity on the survival, oxygen consumption and blood physiology of Korean rockfish Sebastes schlegelii (body weight 97.4 ± 1.7 g, mean ± SD) was investigated at nine different salinities of 33.4 (control), 33.1, 32.8, 32.2, 31.0, 28.7, 23.9, 14.5 and 3.8 psu, respectively. Survival and blood physiology were measured at each salinity in two separate trials of 96 and 24 hr duration, respectively. Oxygen consumption rate (OCR) was determined at stepwise salinity exposure (33.4→33.1→ 32.8→32.2→31.0→28.7→23.9→14.5→3.8 psu) with an interval of 24 hr for each salinity. No death of fishes were observed in the range of 33.4 to 14.5 psu, but the survival rate was reduced to 26.7% at 3.8 psu after 96 hr. The OCRs were not significantly different in the range 33.4 to 28.7 psu (p > 0.05), but significantly increased until 14.5 psu and then drastically decreased at 3.8 psu compared to the control (p < 0.05). The concentrations of plasma Na+ and Cl- were significantly lower in fish exposed at 3.8 psu compared to the control (p < 0.05). The results of this study provide evidence that S. schlegelii exposed to concentrations below 23.9 psu show significant physiological responses to tolerate salinity changes under the experimental conditions we established.


Lee J.-A.,Tong Yeong Marine Living Resources Research and Conservation Center | Lee J.S.,Oceanographic Measurement and Instrument Calibration Service Center | Kim J.-H.,Oceanographic Measurement and Instrument Calibration Service Center | Myoung J.-G.,Tong Yeong Marine Living Resources Research and Conservation Center | And 2 more authors.
Ocean and Polar Research | Year: 2014

The black scraper Thamnaconus modestus was a commercially important fish species in the 1980s, but suddenly its commercial significance decreased in the 1990s mainly due to continuous overfishing. Recently, in order to reverse the depleted stocks of the black scraper and help the species recover, seed production technology has emerged. This has led to the farming of the black scraper in several parts of the southern coast of Korea. Since detailed research on its metabolism in relation to water temperature has been scanty, this was the investigative focus of the present study. The standard metabolism rates of the black scraper (9-10 months old, total length = 22.6 ± 0.8 cm, wet weight = 140.3 ± 13.9 g) were measured at seven different water temperature settings (12, 15, 17, 20, 23, 26, 28°C) to understand the relationship between metabolism and water temperature. Relationships between water temperature (WT) and oxygen consumption rate (OCR) were obtained as SOCR (weight-specific oxygen consumption rate) = 0.0117WT - 0.0135 (r2= 0.9351) and IOCR (oxygen consumption rate per individual) = 1.8160WT - 5.4007 (r2= 9428). The Q10 (temperature sensitivity), an indicator of the sensitivity of biological function to temperature, was analyzed. In our experiment, when the water temperature increased, the Q10 value decreased. The Q10 value was 6.27 in waters where the temperature ranged from 12-15°C and this was much higher than the values obtained in waters where temperatures ranged between (1) 15-23°C and (2) 23-28°C. Consequently, it was shown that the black scraper is a warm water species and inhabiting waters in the temperature range from 15-28°C is deemed appropriate.

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