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(2) Development of acoustic survey for mid- and deep-sea fish biomass

@Acoustic technique enables us to estimate size and number of fish by supersonic waves. Analytical methods as well as acoustic techniques and devices are now being developed to identify mid- and deep-sea fish and to estimate biomass of them. Recently, the results of acoustic surveys were combined with those of quantitative net samplings of fish, which revealed the existence of prey-predator interactions between small pelagic fish (e.g. sardine and mackerel) and mid- and deep-sea fish (e.g. myctophid fish) off Doto and Sanriku areas.


Echogram obtained in the subarctic region (left) and schematic diagram of the prey?predator relationships among mid- and deep-sea fish and small pelagic fish.


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Tohoku National Fisheries Research Institute

E-mail: hsaito@affrc.go.jp