Animals with loggers or pingers record their behavior by themselves. We have become able to track their lives under the water.
While data are accumulated in a tag for biologging, they are transmitted from the remote distance to a researcher for biotelemetry.
![](https://repun-app.fish.hokudai.ac.jp/pluginfile.php/2162/mod_label/intro/%E5%9B%B35%20%282%29.png)