A5085882082- Marine and fisheries research
- Fish Ecology and Management Studies
- Marine Bivalve and Aquaculture Studies
- Microplastics and Plastic Pollution
- Turtle Biology and Conservation
- Aquaculture Nutrition and Growth
- Recycling and Waste Management Techniques
- Ship Hydrodynamics and Maneuverability
- Fish Biology and Ecology Studies
- Water Quality Monitoring Technologies
- Ichthyology and Marine Biology
- Marine animal studies overview
- Food Industry and Aquatic Biology
- Crustacean biology and ecology
- Cephalopods and Marine Biology
- Coastal and Marine Management
- Genetic and phenotypic traits in livestock
- Underwater Vehicles and Communication Systems
- Identification and Quantification in Food
- biodegradable polymer synthesis and properties
- Fluid Dynamics Simulations and Interactions
- Avian ecology and behavior
- Reproductive biology and impacts on aquatic species
- Engineering Applied Research
- Amphibian and Reptile Biology
Tokyo University of Marine Science and Technology
2015-2025
Institute for Marine Biosciences
2009
The University of Tokyo
2000-2004
Towa Pharmaceutical (Japan)
1998
Nippon Suisan Kaisha (Japan)
1998
Japan Fisheries Research and Education Agency
1986-1997
Hokkaido University
1994
National Fisheries Institute
1991
Chugoku Electric Power (Japan)
1990
Shikoku (Japan)
1990
To investigate concentrations of pelagic micro- (< 5 mm in size) and mesoplastics (> mm) the East Asian seas around Japan, field surveys using two vessels were conducted concurrently summer 2014. The total particle count (pieces km− 2) was computed based on observed m− 3) small plastic fragments (both mesoplastics) collected neuston nets. microplastics within study area 1,720,000 pieces 2, 16 times greater than North Pacific 27 world oceans. proportion increased upstream northeastward ocean...
Abstract Laboratory-based studies have suggested that marine organisms can be harmed by ingesting microplastics. However, unless the current and future microplastic abundance in ocean environment is quantified, these experimental could criticized for using an unrealistic density or sparsity of Here we show secular variations pelagic Pacific Ocean from 1957 to 2066, based on a combination numerical modeling transoceanic surveys conducted meridionally Antarctica Japan. Marine plastic pollution...
A field survey to collect microplastics with sizes <5mm was conducted in the Southern Ocean 2016. We performed five net-tows and collected 44 pieces of plastic. Total particle counts entire water column, which is free vertical mixing, were computed using surface concentration (particle count per unit seawater volume) microplastics, wind speed, significant wave height during observation period. at two stations near Antarctica estimated be order 100,000pieceskm-2.
A numerical model was established to reproduce the oceanic transport processes of microplastics and mesoplastics in Sea Japan. particle tracking model, where surface ocean currents were given by a combination reanalysis current product Stokes drift computed separately wave simulated movement. The results corresponded with field survey. Modeled indicated micro- are moved northeastward Tsushima Current. Subsequently, selectively moves during winter toward Japanese coast, resulting increased...
Abstract A total of 8218 pelagic microplastic samples from the world’s oceans were synthesized to create a dataset composed raw, calibrated, processed, and gridded data which are made available public. The raw abundance obtained by different research projects using surface net tows or continuous seawater intake. Fibrous microplastics removed calibrated dataset. Microplastic fluctuates due vertical mixing under oceanic conditions was standardized. An optimum interpolation method used data; in...
An interlaboratory comparison exercise was conducted to assess the consistency of microplastic quantification across several laboratories. The test samples were prepared by mixing one liter seawater free plastics, microplastics made from polypropylene, high- and low-density polyethylene, artificial particles in two plastic bottles, analyzed concurrently 12 experienced laboratories around world. minimum requirements quantify examined comparing actual numbers these sample bottles with measured...
Two neuston nets, mesh opening 1.00 mm and 0.333 mm, were towed in parallel. The net collected more microplastics of longest length ≤2.00 than the net. Mesh selection curve for was estimated with SELECT analysis by comparison size distributions two nets. Selection net, often used as a standard microplastic sampling, also on assumption geometrical similarity between given retention probability. Approximately 60% amount (0.4–1.0 mm) sampling passed through thus unaccounted for. can retain at...
A nested double neuston net was prepared and used to collect samples from the surface of coastal waters around Japan obtain information about properties both small microplastics (SMPs; <350 μm) large (LMPs; >350 μm). The SMP concentrations ranged 1000 5900 pieces m-3 in open ocean averaged approximately 3000 inner part Tokyo Bay. were 20-60 times greater than LMP concentrations. By analyzing seawater, we obtained a microplastic size distribution that spanned 50-5000 μm. LMPs mainly comprised...
Polystyrene foam is widely used due to its lightweight, impact resistance, and excellent thermal insulation properties. Meanwhile, weak adhesion between beads in polystyrene leads fragmentation, generating a substantial amount of microplastics (<5 mm). Such debris littered on beaches diminishes the aesthetic value coastal areas, negatively impacting tourism. Due density lower than other plastics, macroplastics float sea surface and, thus, they are significantly influenced by wind drag during...
Marine debris on the seafloor has not been thoroughly investigated, and there is little information compared to other types of marine debris. We conducted bottom trawl surveys determine present situation in offshore areas around Japan. The survey was three sea with different characteristics. As a result, it found that amount submarine canyons (2926.1 items/km2) higher than continental shelf. It revealed most comprised plastic products, retains its condition for long time (over 30 years)...
Square mesh panels are often inserted in the codend or extension of a fishing net to allow under-sized fish an extra opportunity escape. The effectiveness panel can be quantified by placing small-mesh cover over catch all that escape through it. This paper develops methodology for modelling data from such covered experiments. selection process is modelled two stages: first, area, and second, conventional selection. Several different curves describing area investigated. These include separate...