Tracking Radio-tagged Masu Salmon (Oncorhynchus masou) from the Sky by Use of Drone

Abstract Excerpt:
In order to track the location and movement of salmonids in rivers and lakes, several types of external tags such as fin-clipped, ribbon, spaghetti, elastomer (Choe and Yamazaki 1996), etc. are traditionally used. However, it has been a problem that such tags should be checked visually by recapturing the released fish in various locations, as the tag detection rate largely depends on the sampling locations and procedures. In order to improve the recapture rate, fish collection procedures by use of net, trap, fishing rod, electric fisher, etc. have also been developed.