Yoshimi Takao

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Central-place foragers that must return to a breeding site to deliver food to offspring are faced with trade-offs between prey patch quality and distance from the colony. Among colonial animals, pinnipeds and seabirds may have different provisioning strategies, due to differences in their ability to travel and store energy. We compared the foraging areas of(More)
Acoustic tags were used to examine the spatial and temporal distribution of southern bluefin tuna (SBT) in southern Western Australia, which is in a region where fishery-independent acoustic surveys of the recruitment abundance index of SBT have been historically undertaken. We investigated patterns of SBT distribution within and inshore of the acoustic(More)
The J-QUEST instrument package, a quantitative 70kHz split-beam echo sounder and a stereo TV camera, is being developed to observe mesopelagic fish. In situ acoustic and optical measurements of single fish within aggregations include swimming speed, target strength, length, and tilt angle. Acoustic data and two video signals are monitored in real-time via(More)
Target strength (TS) of fish is important in order to convert acoustic integration values obtained by acoustic survey into estimates of fish abundance. A large indoor tank has been used in underwater acoustics experiments such as measurements of the target strength pattern of fish. It was equipped with an electric flatcar for the purpose of loading and(More)
Japanese approaches to mitigate bycatch of juvenile bigeye tuna by purse seine on FAD in the western and central Pacific Ocean in recent years are reviewed. These attempts are collaborative works between Japanese fishery industry, Fishery Research Agency of Japan and Japanese government, which are corresponding to CMM2008-01 Paragraphs 25 and 26 (Juvenile(More)
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