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by _Microft 1849 days ago
Do you maybe mean something like a fish ladder?

https://en.wikipedia.org/wiki/Fish_ladder

2 comments

Am I seeing that right, they have a guy stand there, pick fish up, and load them in to a pressurised cannon?

I wad expecting something a bit more sophisticated/under the fish's control, even given the name!

They also have an automated system: https://www.youtube.com/watch?v=eGzdOpCisnQ
Can all fish jump? Feels like it may be something that salmon are pretty good at, but a gigantic fish may not.
Jumping is not always necessary. You can get an idea of possible designs for fish ladders from the photographs in the section "Types" in the article.