The effective distance of the fish finder, which is often used in conventional fisheries resource surveys, ranges from several tens of meters to several hundred meters at maximum. "Ocean Acoustic Waveguide Remote Sensing" developed at the Massachusetts Institute of Technology in the United States, is an epoch-making technology that enables weather radar-like visualization of schools of pelagic fish which has been demonstrated out to radii of roughly 60 km. It uses the resonance frequency of fish swim bladders, which is much lower than the ultrasonic sounds used by fish finders, to image pelagic fish resources over vast areas in real time, and make minute to minute updates of areal population densities. The technology also has been demonstrated to detect, track and classify cetaceans that emit their own sounds out to ranges between 100-200 km, as well as the local sounds fish shoals emit during the breeding season.  If this technology is introduced to the fishing grounds of pelagic resources, it will not only save the searching time of target shoals and aid efficient capture, but it will also enable adaptive management of fish resources referring to the current status of the biomass distributions, and spatio-temporal quantification of behavioral dynamics.

At this Ocean Forum hosted by the Ocean Policy Research Institute of the Sasakawa Peace Foundation (OPRI-SPF), we will welcome Professor Nicolas Makris and Professor Purnima Ratilal Makris, who developed this technology, and discuss the application of this technology to the management of various Asian fisheries resources.
 

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