Persistent organic pollutants in marine fish from Yongxing Island, South China Sea: Levels, composition profiles and human dietary exposure assessment

Beachrock is considered a good archive for past sea-levels because of its unique formation position (intertidal zone). To evaluate sea-level history in the northern South China Sea, three well-preserved beachrock outcrops (Beigang, Gongshanbei, and Hengling) at Weizhou Island, northern South China Sea were selected to examine their relative elevation, sedimentological, mineralogical, and geochemical characteristics. Acropora branches with well-preserved surface micro-structures were selected from the beachrocks and used to determine the ages of these beachrocks via U-series dating. The results show that the beachrocks are composed of coral reef sediments, terrigenous clastics, volcanic clastics, and various calcite cements. These sediments accumulated in the intertidal zone of Weizhou Island were then cemented in a meteoric water environment. The U-series ages of beachrocks from Beigang, Gongshanbei, and Hengling are 1712–768 ca. BP, 1766–1070 ca. BP, and 1493–604 ca. BP (before 1950 AD) respectively. Their elevations are 0.91–1.16 m, 0.95–1.24 m, and 0.82–1.17 m higher than the modern homologous sedimentary zones, respectively. Therefore, we concluded that the sea-level in the Meghalayan age (1766–604 ca. BP) was 0.82–1.24 m higher than the present, and that the sea-level over this period showed a declining trend.

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Deep seafloor plastics as the source and sink of organic pollutants in the northern South China Sea

The Science of The Total Environment ◽

10.1016/j.scitotenv.2020.144228 ◽

2021 ◽

Vol 765 ◽

pp. 144228

Author(s):

Shamik Dasgupta ◽

Xiaotong Peng ◽

Hengchao Xu ◽

Kaiwen Ta ◽

Shun Chen ◽

...

Keyword(s):

South China Sea ◽

Organic Pollutants ◽

South China ◽

Northern South China Sea ◽

China Sea ◽

Source And Sink

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Spatiotemporal variations of extreme sea levels around the South China Sea: assessing the influence of tropical cyclones, monsoons and major climate modes

Natural Hazards ◽

10.1007/s11069-019-03596-2 ◽

2019 ◽

Vol 98 (3) ◽

pp. 969-1001 ◽

Cited By ~ 1

Author(s):

Dat T. Pham ◽

Adam D. Switzer ◽

Gabriel Huerta ◽

Aron J. Meltzner ◽

Huan M. Nguyen ◽

...

Keyword(s):

South China Sea ◽

Tropical Cyclones ◽

South China ◽

The South China Sea ◽

Spatiotemporal Variations ◽

The South ◽

Sea Levels ◽

Climate Modes ◽

China Sea ◽

Extreme Sea Levels

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Organic pollutants in the central and coastal Beibu Gulf, South China Sea

Marine Pollution Bulletin ◽

10.1016/j.marpolbul.2015.10.023 ◽

2015 ◽

Vol 101 (2) ◽

pp. 972-985 ◽

Cited By ~ 10

Author(s):

David Kaiser ◽

Ines Hand ◽

DanielaUnger ◽

Detlef E. Schulz-Bull ◽

Joanna J. Waniek

Keyword(s):

South China Sea ◽

Organic Pollutants ◽

South China ◽

Beibu Gulf ◽

China Sea

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Optimization of a Marine Fish Release Strategy: A Case Study of Black Sea Bream Acanthopagrus schlegelii in the Zhanjiang Estuary, Northern South China Sea

Frontiers in Environmental Science ◽

10.3389/fenvs.2021.779544 ◽

2021 ◽

Vol 9 ◽

Author(s):

Shenzeng Zhang ◽

Lin Lin ◽

Xuefeng Wang

Keyword(s):

South China Sea ◽

Black Sea ◽

Marine Fish ◽

South China ◽

Northern South China Sea ◽

Sea Bream ◽

Fish Stock ◽

Acanthopagrus Schlegelii ◽

China Sea ◽

Release Strategy

The release strategy (choice of the species and locations stocked, releasing mode, and stocking size and times) is an important part of quantitative evaluations of marine fish stock enhancement, while optimization of the release strategy can contribute to assess the stocking success intended to alleviate declining fishery resources and to increase the income of fishers. In this study, a typical fish species released in the northern South China Sea, black sea bream Acanthopagrus schlegelii, was taken as the research object. The biological characteristics of this sparid were determined from samples collected from waters in the Zhanjiang estuary during June, July, and September 2020 to April 2021, and the data were applied to estimate its length frequency and its growth parameters using the ELEFAN I run in FiSAT II. We then simulated and evaluated the stocking effects of five scenarios under different release strategies, while assuming a fixed total quantity of released fish and a constant of mortality rate at different life stages. The results showed that (1) the breeding season of black sea bream in this region is mainly from December to March of the next year, which is also the period when most significant sexual reversal in this species occurs, and (2) the relationship between standard length and weight in black sea bream is W = 5.092 × 10–5L2.906, L∞ = 54.39 cm, K = 0.15, and t0 = −0.967. (3) The recommended period to release black sea bream in Zhanjiang waters is from June to October. It appears more productive if the total quantity of fish released can be divided into two batches. The growth potential of released juvenile fish in this study was evaluated based on a density-dependent theory, and the stocking effect of released stocks was simulated with the consideration for biological parameters and field sampling technique. This study provides a reference for the optimization of fish release strategies in coastal waters.

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Metals in Fishes from Yongshu Island, Southern South China Sea: Human Health Risk Assessment

Journal of Toxicology ◽

10.1155/2017/2458293 ◽

2017 ◽

Vol 2017 ◽

pp. 1-12 ◽

Cited By ~ 2

Author(s):

Zhai Wu ◽

Ye Xu ◽

Minggang Cai ◽

Sha-Yen Cheng ◽

Huorong Chen ◽

...

Keyword(s):

South China Sea ◽

South China ◽

Human Health Risk ◽

Dietary Exposure ◽

Dry Weight ◽

Potential Ecological Risk ◽

National Standard ◽

Human Consumption ◽

Southern South China Sea ◽

China Sea

In order to assess the bioaccumulation of metals associated with gender, tissues, and their potential ecological risk, four species of fish were collected from the Yongshu Island in the Southern South China Sea. Metals and stable Pb isotopes in their tissues (muscle, gill, liver, intestine, and ovary) were determined. The concentrations of metals (mg/kg, dry weight) in these species were ND–21.60 (Cd), 1.21–4.87 (Cr), 0.42–22.4 (Cu), 1.01–51.8 (Mn), 0.30–3.28 (Ni), 6.04–1.29 × 103 (Zn), 14.89–1.40 × 103 (Fe), and 0.22–3.36 (Pb). In general, the liver and intestine absorbed more metals than the other tissues. Metals accumulation can be influenced by gender and feeding behavior and in fact, female fish and dietary exposure are more prone to accumulate metals. In addition, Pb isotopic ratios indicated that all species had significant biological fractionation, which may not make them good tracers for source identification. The metal concentrations of most samples were lower than the national standard values of the FAO (USA), which suggested that human consumption of these species may not cause health risks. However, since the surrounding areas are developing rapidly, the potential environmental risk of metals will intensify and should receive more attention.

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