To examine the habitat usage of adult Pacific bluefin tuna (PBF), electronic tagging was conducted in the Sea of Japan during May and June of 2012-2017. Archival tags were internally implanted and pop-up satellite archival transmitting tags were deployed; data on the horizontal movements and diving behaviours of 36 individual PBF were successfully retrieved. In the summer spawning season, the tagged PBF were concentrated near Sado Island and Oki Island in the Sea of Japan, and they were distributed widely to the southwest (near Tsushima Island) or northeast (near the Tsugaru Strait) in the autumn and winter. We obtained the first long-term tracking record (246 d) for adult PBF, and this individual exhibited residency in a known spawning region during the spawning season in the proximity of warm-core eddy features. This fish spent most of the daytime below the thermocline between 30 and 150 m depths where the surface ambient temperature was 26.0 ± 1.5°C, but at night it ventured into the warm surface layer. Its whole-body heat transfer coefficient increased when it experienced warm waters (≥24°C), which we suggest is a physiological response to avoid overheating. The mean peritoneal cavity temperature was only 1.8°C higher than the ambient temperature, compared with 6.9°C higher during the cooler autumn-winter period. Our hypothesis is that the warm surface temperatures found in the spawning grounds induce a physiology-reproduction trade-off in adult PBF, which must behaviourally and physiologically thermoregulate their body temperature to gain spatial and temporal access to oceanographic conditions that may promote larval survivorship and growth.

5G mobile networks are being applied to various services. Herein, optical access networks based on passive optical network technologies assume the role of aggregating these mobile networks. Although 5G mobile networks and optical access networks have been operated independently, co-operated traffic control between these networks is required to provide end-to- end QoS. This paper proposes a platform using software virtualization to evaluate various traffic control mechanisms. This paper surveys various services across 5G mobile networks and the network requirements for these services. Then, it describes logical models to evaluate the co- operation between the networks and implementation of these models as the platform. Especially, this paper focuses on multiplexing queuing models and their implementation on this platform.

In this study, we propose a bandwidth assignment scheme designed to measure traffic from 5G systems at optical network units of optical access systems and reflect it in dynamic bandwidth allocation (DBA) at optical line terminals. The proposed algorithm applies a linear regression analysis and an extrapolation approximation to enable a simple implementation. Although DBA is conventionally performed independently in optical access networks, the proposed method links it with the amount of traffic from 5G systems to achieve seamless bandwidth allocation.