[HN Gopher] Fish Doorbell
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Fish Doorbell
Author : yamman
Score : 83 points
Date : 2021-03-31 09:07 UTC (1 days ago)
(HTM) web link (dutchreview.com)
(TXT) w3m dump (dutchreview.com)
| agotterer wrote:
| I read the article, but I feel like I still missed the point. Why
| are they preventing the fish from just swimming through on their
| own? Is this only to raise local awareness or is there some
| benefit I missed for the fish?
| Vinnl wrote:
| It's a sluice, so the fish can only swim through when it's
| open. In the summer it's regularly opened for passing boats,
| but during winter they have to do so explicitly just for the
| fish.
| zck wrote:
| For places humans have dammed a river, a fish ladder can be
| installed to let fish continue to swim upstream:
| https://en.wikipedia.org/wiki/Fish_ladder. I wonder why that's
| not used here.
|
| Perhaps it's related to this being a _lock_, not a dam. In
| addition to having water loss from the lock, the middle part of
| the lock goes up and down, so you'd have to have separate fish
| ladders for each part.
|
| For the most fun fish transport I've seen, check out the Salmon
| Cannon: https://www.youtube.com/watch?v=nopg9JSTTzg and
| https://www.youtube.com/watch?v=eGzdOpCisnQ. It uses a
| pressurized tube to transfer salmon from the low to high side. In
| the second video, the distance is over a kilometer.
| wunderflix wrote:
| From the Wikipedia article you referenced to:
|
| _> Fish ladders have a mixed record of effectiveness. They
| vary in effectiveness for different types of species, with one
| study showing that only three percent of American Shad make it
| through all the fish ladders on the way to their spawning
| ground_
|
| I guess that's what they call artificial selection pressure.
| _jal wrote:
| If we're going the route of applying selection pressure to
| other species for human amusement, then we should just go
| straight to unicycles.
| dtgriscom wrote:
| ... so, you think fish will need unicycles more than they
| do bicycles?
| wunderflix wrote:
| Are you aware that computers are a "bicycle for the
| mind"?
| timwaagh wrote:
| I'm from the city in question and not that happy the
| municipality chooses to throw away money on a vanity campaign.
| If all they wanted was to transport fish this webcam wouldn't
| be necessary.
| crote wrote:
| It's a tiny monumental lock dating back to the middle ages. It
| has a history going back to the 1300s, as do the buildings
| around it.
|
| Adding a traditional fish ladder isn't really a realistic
| option at this location.
| Vinnl wrote:
| It's more of an awareness campaign than purely for the benefit
| of the fish. One of the people involved with it said in a Dutch
| interview that there are other locations where this _is_
| automated.
| jvolkman wrote:
| There are some locks in Seattle with a ladder:
| https://en.wikipedia.org/wiki/Ballard_Locks#Fish_ladder
| hinkley wrote:
| They achieved this by putting the ladder on the opposite side
| of the channel from the locks.
|
| So the think with salmon is that they orient by sound. If
| they don't know where to go next they head toward the sound
| of running water - the next rapids upstream. To get them to
| traverse a dam you have to make waterfall noises in the
| correct spot and _not_ make them in the wrong spot. I believe
| I've read of people using this to trick salmon into going
| through locks, but the ladders seem to be simpler.
| _31 wrote:
| Even the fish from Amsterdam are trying to get to the Culture
| Boat.
| xaedes wrote:
| What a nice idea. I mean one could probably automate the button
| with machine learning (it just needs to look for fish). But damn,
| it is wholesome to manually watch and help them.
|
| Here is the link to the live stream with the "door bell" button.
|
| https://visdeurbel.nl/
| tempodox wrote:
| As the article says, it's a lot more fun this way. I love it.
|
| Also, looks like the live stream is currently being hugged to
| death. Maybe it wasn't such a good idea to post this here,
| after all ;-)
| athenot wrote:
| > live stream is currently being hugged to death
|
| Perhaps someone should ring the doorbell so it flows again...
| StavrosK wrote:
| Aw, it doesn't show a button for me...
| user568439 wrote:
| That's the point. This creates awareness about the life in the
| water and hopefully it helps to reduce people throwing trash in
| it
| msrenee wrote:
| Thanks for the link. I just enjoy watching fish. I'll visit
| once traffic dies down a little here.
| A_No_Name_Mouse wrote:
| I thought this had to be an April fools day prank, but apparently
| it went live a couple of days ago and was on the news.
|
| Anyway, this means a second stream beside the Iceland vulcano on
| my 2nd monitor. It's about 1km. from where I live, and I had to
| learn about it on HN...
|
| Edit: link to cam is on https://visdeurbel.nl/
| daveslash wrote:
| If I interpret this correctly, the fish don't hit the doorbell --
| human bystanders see fish and use their mobile devices to hit the
| doorbell.
|
| There's probably a solution that could detect the fish without
| human intervention, but it seems like one of the points is to
| help the citizens engage more an build awareness of the
| human/wild-life interaction.
| Jeremy1026 wrote:
| From the article:
|
| > Why did the city decide to go for a digital doorbell instead
| of an automatic sensor? Because it's a lot more fun, of course.
| Udik wrote:
| So Dutch.
| mnd999 wrote:
| I didn't manage to get past the Dutch cookie consent. How do I
| say no cookies or legitimate interest in Dutch?
| oh_sigh wrote:
| You should try setting your user agent to default block
| javascript + cookies. It's actually not that bad. I'm not a
| zealot, I just whitelist sites as I come across them that don't
| work without those things. In the end, most websites I visit
| work _better_ without javascript /cookies rather than degrading
| in performance. For example basically every newspaper that
| prevents you from reading too many articles lets you read as
| many as you want without javascript running.
| notanote wrote:
| A surprisingly high number of links posted to HN can be read
| while having js and cookies disabled. It's not for everyone,
| but it does work to bypass the consent popup in this case as
| well.
| throwawayfire wrote:
| This is a tricky one.
|
| There is one route to revoke consent and another route to
| object to legitimate interest, and it doesn't seem that you can
| precisely follow both routes. I assume the second option does
| both, but it's not clear.
|
| I've seen this same pattern in English also, so I'll include my
| translation:
|
| Meer Opties (More Options) -> Gerechtvaardigd Belang
| (Legitimate Interest, small link on bottom left) -> Bezwaar
| Tegen Alles (Object to All) -> Opslaan en Afsluiten (Save and
| Close)
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