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Non-native plants clog Japanese river

October 22nd, 2008 by James

water lettuce

Part of the Kyu-yoshino river in Kagoshima Prefecture has turned green:


The surface of the river is covered in water lettuce plants. Water lettuce is not native to Japan, and it is illegal to cultivate it here, but somehow a few plants managed to find their way into the river and multiply. It is feared that the plants are suffocating the river and killing local plants and fish, so authorities are making their best efforts to remove all the water lettuce. They expect the clean-up to cost hundreds of millions of yen.



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16 Comments »

Comment by Montsan
2008-10-22 17:08:48

Too bad it’s not edible. Would have made one heck of a salad bar. :(

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Comment by Level3
2008-10-22 18:16:27

hundreds of millions of yen?

If the extent of the problem is just what’s in the photo, I can do it for 1 million plus boat rental expenses by myself in a week.

And I’ll charge a mere 10 million yen to the government.

Shit, give homeless guys 100 yen per kilo gathered.

Why do I slave away at my job when the environmental cleanup business looks so lucrative? And it’s not like this is hazardous waste or anything.

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Comment by LB
2008-10-22 18:22:26

A cleanup costing hundreds of millions of yen? Haven’t these guys heard of napalm and flamethrowers? Much cheaper, very effective, and a whole lot more fun.

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Comment by 404error
2008-10-22 19:59:52

KILL IT WITH FIRE!!!!^^

na srsly that would damage the river even more^^

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Comment by Colin
2008-10-22 20:16:37

Ask any British gardener about Japanese Knotweed and you’ll probably get a look of unrestrained horror. Unfortunately the Japanese won’t be getting much sympathy from us.

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Comment by helical
2008-10-22 22:58:21

SYMPATHY!? NO SYMPATHY! Because we totally unleashed Japanese Knotweed on Britain in a surprise attack with the full intent to slowly strangle the native wildlife with a belligerent alien species! It’s even named after us! Let the gardeners suffer and know who did it to them!
Muahahahahah!

hahaha… ha….

… heh, or something like that, I guess?

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Comment by one
2008-10-23 01:45:02

I am willing to bet this was planted by the people who will charge all that money to clean it up. So called “experts”.

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Comment by Colin
2008-10-23 07:06:51

WHOA theres another Colin. I read his comment and was like “Wait. What? This is my first time looking at this topic”

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Comment by Alex
2008-10-23 08:59:48

Farrell.

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Comment by jmadsen
2008-10-23 10:24:52

ok, so I thought – “nah, there has to be more to it”

so, I actually followed the link to learn about it, and how ot clean it up…

“Control Options
Mechanical/Physical

Water lettuce can be removed by raking or seining it from the pond’s surface.”

someone is making a killing….

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Comment by Durf
2008-10-24 11:15:44

Yes, because it costs no money whatsoever to arrange a fleet of trucks and cart off tons of plant matter and find a place to legally dump it. It’s just as simple as scooping it out of the water and tossing it up on the nearby roads, I suppose?

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Comment by jmadsen
2008-10-24 11:29:25

of course it does, but not “hundreds of millions of yen”

I imagine it would make decent fertilizer, for example (from reading, it doesn’t seem like it would “sprout” or leave seeds if placed in a muddy field in the fall after the crop has been harvested.) I’m sure the professionals could think of a few other ways.

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Comment by jmadsen
2008-10-23 10:34:48

oh! an idea (cause I’m in a good mood :-) )

let’s all get together for a big picnic/water lettuce raking party this weekend….do it for free… a few beers…ask the locals to help us dispose of the stuff in a bonfire…

probably get arrested or something…

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Comment by D-San
2008-10-23 12:45:12

I’m down with that!

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Comment by Dave Faulkmore
2008-10-23 22:01:31

If there is money in cleaning it up. Then there is more money in spreading the water lettuce to rivers that grow wasabi. You know those crystal clean rivers that Japanese brag about. Bet water lettuce likes clean water, too.

Then we can create jobs for foreigners in Japan.

Don’t burn the water lettuce. It’s golden…

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