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Tokyo, Japan

Tokyo University of Marine Science and Technology is a national university in Japan. The main campus is located in Minato, Tokyo and another campus is in Koto, Tokyo. Wikipedia.

Kanda J.,Tokyo University of Marine Science and Technology
Biogeosciences | Year: 2013

The rate of cesium-137 (137Cs) release to the sea from the Fukushima Dai-ichi Nuclear Power Plant for the period until September 2012 was estimated. Publicly released data on 137Cs radioactivity in seawater near the power plant by Tokyo Electric Power Company strongly suggest a continuing release of radionuclides to the sea. The plant has an artificial harbour facility, and the exchange rate of harbour water with surrounding seawater was estimated by the decrease in radioactivity immediately after an intense radioactive water release. The estimated exchange rate of water in the harbour was 0.44 d-1 during the period from 6 to 19 April. The 137Cs radioactivity in the harbour water was substantially higher than that of seawater outside and remained relatively stable after June 2011. A quasi-steady state was assumed with continuous water exchange, and the average release rate of 137Cs was estimated to be 93 GBq d-1 in summer 2011 and 8.1 GBq d-1 in summer 2012. © 2013 Author(s). Source

Kitada S.,Tokyo University of Marine Science and Technology
Fisheries Science | Year: 2014

This study reviews the present status of the Japanese chum salmon Oncorhynchus keta stock enhancement program and considers the ecological sustainability of wild populations while providing fishery production, exemplified by the hatchery-based Kitami region set net fishery. The return rate and the number of returns have been historically high in the Sea of Okhotsk, but have decreased in other regions since 2005. Natural spawning of chum salmon occurred in at least 160 rivers in Hokkaido. The genetic diversity of Japanese chum salmon was similar to or higher than that of other Pacific Rim populations. Numbers of alleles were high at microsatellite loci, but the loss of rare haplotypes was observed in all populations. The estimated N e/N ratio for the Kitami region was >0.15 % including hatchery and wild fish under the present high fishing pressure. Four regional populations were inferred in Hokkaido, however, genetic differentiation was weak and some river-populations were nested. Substantial changes in run timing were observed, but it has recovered gradually owing to the recent practice of escapement. Our analyses highlight the importance of juvenile quality and the vital roles of escapements in enhanced and non-enhanced rivers. New research is needed to minimize the genetic risks associated with hatchery programs. © 2014 The Author(s). Source

Takeuchi T.,Tokyo University of Marine Science and Technology
Fisheries Science | Year: 2014

In seedling production of seawater fish, providing appropriate nutrition is a necessity for successful production of quality larvae and juveniles. Mass-produced live prey organisms, such as the rotifer Brachionus plicatilis species complex and brine shrimp Artemia spp., alone do not provide sufficient nutrition to the larvae and juveniles of seawater animals. This inadequacy has led to various problems related to fish quality and health, including increased incidence of morphological and behavioral abnormalities and mass mortalities. It is, therefore, important to identify the factors associated with these problems to improve seedling production techniques. This review collates the efforts made during the past two decades in larval nutrition-focusing on advances made in the use of certain nutrients, such as docosahexaenoic acid, vitamin A derivatives, and taurine that are important for the mass production of seawater fish larvae and juveniles-with an aim to improve the quality and health of fish. © 2014 The Author(s). Source

Fukuda Y.,Tokyo University of Marine Science and Technology
Fisheries Science | Year: 2014

Imitation crab meat, first developed in Japan, is very popular in restaurants in Paris, appearing as "surimi" on the menu. Today, more than 300,000 tons of imitation crab meat are produced in modern imitation crab meat plants in North America, Europe, and Russia, and the term "surimi" has gained acceptance internationally. The term "surimi" originally referred to frozen surimi, an intermediate material for fish paste products. Frozen surimi was developed from walleye pollock, in Japan, in 1959, marking the beginning of the use of intermediate material for aquatic food products. As intermediate food materials such as wheat flour and starch paved the way for the modernization of the agricultural food industry and the industrialized production of agricultural food, so the development of frozen surimi made worldwide production of imitation crab meat possible, and paved the way for the modernization of the aquatic food industry and the industrialized production of aquatic food based on the results of chemical and technical research. Two major developments, namely frozen surimi and imitation crab meat, promoted the use of walleye pollock and led to innovation in aquatic food production technology. © 2014 The Japanese Society of Fisheries Science. Source

A new supply source of enzymes useful for modification of phospholipids for example, and a method for producing 2-acyl lysophospholipid, a method for producing monoacylglycerol, and a method for producing ceramide, as well as a new method for degumming fat and oil. A novel microorganism is provided, which belongs to

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