scholarly journals Contamination of Dioxins and PCBs in Sediment Core in Tokyo Bay

2003 ◽  
Vol 13 (2) ◽  
pp. 397-407 ◽  
Author(s):  
Yoshihito TAKEDA ◽  
Kouji KASSAI ◽  
Fuminari IIMURA ◽  
Takaaki TSUKUI ◽  
Hidetoshi YOSHIOKA ◽  
...  
Keyword(s):  
Sediment Core ◽  
Tokyo Bay

Vertical Profiles of Dioxin-like and Estrogenic Activities Associated with a Sediment Core from Tokyo Bay, Japan

2000 ◽  
Vol 34 (17) ◽  
pp. 3568-3573 ◽  
Author(s):  
Kurunthachalam Kannan ◽  
Daniel L. Villeneuve ◽  
Nobuyoshi Yamashita ◽  
Takashi Imagawa ◽  
Shinya Hashimoto ◽  
...  
Keyword(s):  
Sediment Core ◽  
Tokyo Bay ◽  
Vertical Profiles

scholarly journals Evaluation of Pollution Sources of Zinc in Tokyo Bay Based on Zinc Isotope Ratio in Sediment Core

2019 ◽  
Vol 07 (08) ◽  
pp. 141-154
Author(s):  
Masahiro Sakata ◽  
Shohei Okuizumi ◽  
Asami Suzuki Mashio ◽  
Takeshi Ohno ◽  
Shuhei Sakata
Keyword(s):  
Sediment Core ◽  
Isotope Ratio ◽  
Pollution Sources ◽  
Tokyo Bay ◽  
Zinc Isotope

Partitioning of heavy metals into mineral and organic fractions in a sediment core from Tokyo Bay

1980 ◽  
Vol 44 (9) ◽  
pp. 1279-1285 ◽  
Author(s):  
Yasushi Kitano ◽  
Masahiro Sakata ◽  
Eiji Matsumoto
Keyword(s):  
Heavy Metals ◽  
Sediment Core ◽  
Tokyo Bay ◽  
Organic Fractions

Spatial distribution and vertical profile of polybrominated diphenyl ethers and hexabromocyclododecanes in sediment core from Tokyo Bay, Japan

2007 ◽  
Vol 148 (2) ◽  
pp. 409-417 ◽  
Author(s):  
Nguyen Hung Minh ◽  
Tomohiko Isobe ◽  
Daisuke Ueno ◽  
Keizo Matsumoto ◽  
Masayuki Mine ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Sediment Core ◽  
Polybrominated Diphenyl Ethers ◽  
Vertical Profile ◽  
Tokyo Bay ◽  
Diphenyl Ethers

Time trends of perfluorinated compounds from the sediment core of Tokyo Bay, Japan (1950s–2004)

2010 ◽  
Vol 158 (3) ◽  
pp. 756-763 ◽  
Author(s):  
Yasuyuki Zushi ◽  
Masafumi Tamada ◽  
Yutaka Kanai ◽  
Shigeki Masunaga
Keyword(s):  
Sediment Core ◽  
Time Trends ◽  
Perfluorinated Compounds ◽  
Tokyo Bay

Production of asari (Manila) clams, Ruditapes philippinarum, during the period of harvest decrease in the 2000s in the Banzu tidal area, Tokyo Bay

2020 ◽  
Vol 33 ◽  
pp. 14
Author(s):  
Mitsuharu Toba ◽  
Jun Kakino ◽  
Kazuo Tada ◽  
Yutaka Kobayashi ◽  
Hideharu Tsuchie
Keyword(s):  
Field Investigation ◽  
Ruditapes Philippinarum ◽  
Management Style ◽  
Seed Stock ◽  
Tokyo Bay ◽  
Yearly Variation ◽  
Culture Area ◽  
Stock Biomass ◽  
Tidal Area ◽  
High Level

In Tokyo Bay, the harvestable quantity of asari (Manila) clams Ruditapes philippinarum has been decreasing since the late 1990s. We conducted a field investigation on clam density in the Banzu culture area from April 1988 to December 2014 and collected records spanning January 1986 to September 2017 from relevant fisheries cooperative associations to clarify the relationship between the temporal variation in stock abundance and the production activities of fishermen. The yearly variation in clam abundance over the study period was marked by larger decreases in the numbers of larger clams. A large quantity of juvenile clams, beyond the biological productivity of the culture area, may have been introduced as seed stock in the late 1980s despite the high level of harvestable stock. The declines in harvested quantity began in the late 1990s and may have been caused by decreases in harvestable stock despite the continuous addition of seed stock clams. The harvested quantity is likely to be significantly dependent upon the wild clam population, even within the culture area, as the harvestable quantity was not correlated with the quantity of seed stock introduced during the study period. These declines in harvested quantity may have resulted from a decreasing number of operating harvesters due to the low level of harvestable stock and consequently reduced profitability. Two findings were emphasized. A certain management style, based on predictions of the contributions of wild and introduced clams to future stock biomass, is essential for economically-feasible culturing. In areas with less harvestable stock, actions should be taken to maintain the incomes of harvesters while avoiding overexploitation, even if the total harvest quantity decreases.

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