Variations of Marine Environments and Zooplankton Biomass in the Yellow Sea During the Past Four Decades

Choi, Jung-Wha; Park, Won-Gyu

doi:10.13000/jfmse.2013.25.5.1046

Cited by 4 publications

(2 citation statements)

References 16 publications

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“…In summer 2002, the density in the East China Sea obtained through acoustic and net surveys was in the range of 20.4-221.4 mg/m 3 [29], similar to our results. According to the regular ocean observations of zooplankton biomass conducted from 1978 to 2010 using the net sampling method of the National Institute of Fisheries Science of the Korean government at Korea Oceanographic Data Center stations, the density of E. pacifica in spring was in the range of 10.4-913.9 mg/m 3 [47]. Thus, the density shows great variability according to season and year.…”

Section: Discussionmentioning

confidence: 99%

Spatial Distribution of Sound Scattering Layer and Density Estimation of Euphausia pacifica in the Center of the Yellow Sea Bottom Cold Water Determined by Hydroacoustic Surveying

Kim

Kım

Kim

et al. 2022

JMSE

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The Yellow Sea Bottom Cold Water (YSBCW) refers to seawater with a water temperature of 10 °C or less found at the bottom of the center of the Yellow Sea. The spatiotemporal variability of the YSBCW directly affects the distribution of organisms in the marine ecosystem. In this study, hydroacoustic and net surveys were conducted in April (spring) to understand the spatial distribution of the sound scattering layer (SSL) and estimate the density of Euphausia pacifica (E. pacifica) in the YSBCW. Despite the shallow water in the YSBCW region, E. pacifica formed an SSL, which was distributed near the bottom during the daytime; it showed a diel vertical migration (DVM) pattern of movement toward the surface during the nighttime. The mean upward and downward swimming speeds around sunset and sunrise were approximately 0.6 and 0.3–0.4 m/min, respectively. The E. pacifica density was estimated in the central, western, and eastern regions; the results were approximately 15.8, 1.3, and 10.3 g/m2, respectively, indicating significant differences according to region. The results revealed high-density distributions in the central and eastern regions related to the water temperature structure, which differs regionally in the YSBCW area. Additional studies are needed regarding the spatial distribution of E. pacifica in the YSBCW and its relationship with various ocean environmental parameters according to season. The results of this study contribute to a greater understanding of the structure of the marine ecosystem in the YSBCW.

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Section: Discussionmentioning

confidence: 99%

Spatial Distribution of Sound Scattering Layer and Density Estimation of Euphausia pacifica in the Center of the Yellow Sea Bottom Cold Water Determined by Hydroacoustic Surveying

Kim

Kım

Kim

et al. 2022

JMSE

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“…Conversely, winter may bring low-layer water temperatures below 5 • C due to the impact of the Yellow Sea Low-Layer Cold Water Stand (YSBCW) [2]. This environment fosters a habitat for Euphausiacea, a primary food source for smaller fish [3]. However, there are currently concerns about marine environmental pollution due to indiscriminate development and reclamation projects along the West Sea coast, and water temperatures are rising due to global warming.…”

Section: Introductionmentioning

confidence: 99%

Age and Growth of Shotted Halibut, Eopsetta grigorjewi (Herzenstein, 1890), in the West Sea of Korea

Choi,

Youn,

Han

et al. 2023

JMSE

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To investigate the age and growth characteristics of shotted halibut, Eopsetta grigorjewi, in the West Sea of Korea, the samples were collected using gill nets throughout 2019. A total of 861 specimens (693 females and 168 males) were analyzed. The BW-TL relations were BW = 0.0034TL3.3278 (R2 = 0.8716) for females and BW = 0.0031TL3.3359 (R2 = 0.8860) for males. This analysis revealed that males exhibited a larger growth rate than females (p < 0.05). Notably, the anterior and posterior sections of the otolith displayed an elongated oval shape, exceeding the radius of the dorsal and ventral regions. By examining the correlation between radii in four directions and total length, the highest correlation was observed between the total length (TL) and the ventral radius (R). The evaluation of the relationship between the fish total length and the otolith ventral radiusresulted in an equation of TL = 14.657R + 9.1601 (R2 =0.7081) for females and TL = 15.037R + 5.0265 (R2 = 0.6992) for males (p < 0.05). The formation of annuli occurred annually, consistently in January each year, as discerned through monthly changes in marginal index (MI) values. The von Bertalanffy growth equations from the relationship between the otolith annuli radius and the total length were Lt = 83.6 (1 − exp−0.046(t+4.70)) in females (n = 693, p < 0.05) and Lt = 56.8 (1 − exp−0.078(t+2.16)) in males (n = 168, p < 0.05).

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Spring and Summer Zooplankton Community near Tongyeong and Namhaedo in the South Sea of Korea

Do¹,

Lee²,

Choi³

et al. 2017

JFMSE

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Variations of Marine Environments and Zooplankton Biomass in the Yellow Sea During the Past Four Decades

Cited by 4 publications

References 16 publications

Spatial Distribution of Sound Scattering Layer and Density Estimation of Euphausia pacifica in the Center of the Yellow Sea Bottom Cold Water Determined by Hydroacoustic Surveying

Spatial Distribution of Sound Scattering Layer and Density Estimation of Euphausia pacifica in the Center of the Yellow Sea Bottom Cold Water Determined by Hydroacoustic Surveying

Age and Growth of Shotted Halibut, Eopsetta grigorjewi (Herzenstein, 1890), in the West Sea of Korea

Spring and Summer Zooplankton Community near Tongyeong and Namhaedo in the South Sea of Korea

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