4 ms·
However fish that needs to travel upstream have a hard time. It can be solved to some extent.
by fetbaffe 12y ago
However fish that needs to travel upstream have a hard time. It can be solved to some extent.
- sjwright 12y agoWith cannons. https://www.youtube.com/watch?v=kICS32kady4 https://www.youtube.com/watch?v=kICS32kady4