@












Recommended browser of this site inspection is InternetExplorer.
We will recommend the latest version.
Please download here and see when Flash of top page is not reproduced.



 


Project

Mission/DEEP/FRECS2/
Monitor


(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.

 




To the top of this page

 


Contact:
Tohoku National Fisheries Research Institute

E-mail: hsaito@affrc.go.jp