Diel Distribution and Movement of Sound Scattering Layer in Kuroshio Waters, Northeastern Taiwan

Lee, Ming-An; Chao, Ming-Hsiu; Weng, Jinn-Shing; Lan, Yang-Chi; Lu, Hang

doi:10.51400/2709-6998.2189

Cited by 7 publications

(3 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The measurement of E. pacifica in the YSBCW was determined using the 38 and 200 kHz. However, the frequencies were mainly used in previous studies of the Yellow Sea [28,29]. Because this study was performed in spring, and given the proliferation of phytoplankton as prey, it was presumed that large numbers of zooplankton would appear in this season; thus, the present study used the frequency of 200 kHz for good resolution in the field acoustic survey.…”

Section: Data Collectionmentioning

confidence: 99%

“…Then, a threshold of −90 dB of Sv was set to accurately extract the center of the SSL. The upward and downward swimming speeds (Vs) were calculated from the rate of change in the SSL as the derivative of D(t) with the time(t) [28],…”

Section: Acoustic Data Analysis and E Pacifica Identificationmentioning

confidence: 99%

“…In the YSBCW, only the characteristics of circadian changes related to changes in temperature structure have been reported, and few studies have been conducted [12,27]. There have also been studies regarding the distribution of the SSL in the southern Yellow Sea [28] and the estimation of the E. pacifica density in the East China Sea [29]; however, the biomass and spatiotemporal distribution of E. pacifica have not been previously assessed in the YSBCW, and the optimal management strategy for this resource remains unclear. Therefore, because this species is an important biological factor that regulates the total biomass of the marine ecosystem and the fishery resources in the YSBCW area, qualitative and quantitative research regarding E. pacifica is continuously needed for effective resource management.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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

View full text Add to dashboard Cite

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.

show abstract

Section: Data Collectionmentioning

confidence: 99%

Section: Acoustic Data Analysis and E Pacifica Identificationmentioning

confidence: 99%