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What attracts the fish to the tube? The ladders work by providing some water that is going down stream slowly it is an obvious path. If there is no water to swi
by chrisBob 12y ago
What attracts the fish to the tube? The ladders work by providing some water that is going down stream slowly it is an obvious path. If there is no water to swim upstream against I don't understand why a fish would enter a random tube.
- XaspR8d 12y agoAt about 88 secs in the second video[1] they show the inside of some sort of "trap" for the fish where water flows rapidly over a grate (and claim "volitional entry"). But I agree it's still an open question whether you could mitigate the fish's behavior effectively. [1] https://www.youtube.com/watch?v=wSBS2F9VXaE#t=88 https://www.youtube.com/watch?v=wSBS2F9VXaE#t=88
- scott_karana 12y agoThe second video makes it look like there's a downwards "slip and slide", and then the water gets vented out of the tube. If I interpreted it right, there would indeed be an obvious (gentle) downstream. :-)
- micro_cam 12y agoSalmon will swim towards turbulence (as part of a simple navigational strategy) so you can get them to swim into something using that. However, as with fish ladders, I expect it isn't 100% effective. Source: my dad has built some fish hatchery equipment including volitional entry devices.