Electrical Barrier To Keep Asian Carp Out Of Great Lakes
A permanent electrical barrier will go into use in February to protect the Great Lakes from Asian carp that are moving up the Mississippi river. The Chicago Sanitary and Ship Canal Dispersal Barrier stretches two rows of electrodes across the canal (approximately 220 feet apart) to create an Asian carp fence. The electrodes pulse direct current into the water; this causes the fish to turn back rather than pass through the electric current.
(From Schematic Diagram of Chicago San-Ship Canal Barrier)
Asian carp (bighead and silver) were imported by catfish farmers in the south in the 1970's to remove algae and suspended matter out of their ponds. Floods in the 1990's caused many of these farms to overflow their banks; Asian carp were released into the Mississippi River basin. They are voracious eaters and reproduce rapidly; they out-compete native fish that are used by people along the river. They grow up to four feet in length, weighing 100 pounds; they are the most abundant species in some areas of the river. Ecologists fear that they could become a dominant species in the Great Lakes.
(From Asian carp may grow to 100 pounds)
The electrical barrier will cost $9.1 million; 75% is paid from federal funds. It will cost about $500,000 per year to operate. About thirty barges per day pass through the canal.
SF author Roger Zelazny wrote a series of stories published as My Name is Legion in 1976. One of them is set in a marine park in Florida. The park is divided into four separate areas by sonic curtains, which are described as a "sound barrier" that protects the species in the park. Each sonic curtain is controlled by a switches on the bottom; in an unusual touch, dolphins in the park teach each other how to use the controls so they can move freely.
Sonic curtains are similar to a known behavior of humpback whales called bubble feeding. Humpback whales blow air from blow holes while slowly spiraling to the surface; the sound and bubbles concentrate their small prey in a small area. The whales then swim through this narrow spiral, gulping their prey more efficiently.
For another example of an adjustable animal barrier, see the sonobarrier from Frank Herbert's 1977 novel The Dosadi Experiment. Read more about the Asian Carp Fence.
Scroll down for more stories in the same category. (Story submitted 1/13/2005)
Follow this kind of news @Technovelgy.
| Email | RSS | Blog It | Stumble | del.icio.us | Digg | Reddit |
you like to contribute a story tip?
Get the URL of the story, and the related sf author, and add
Comment/Join discussion ( 2 )
Related News Stories -
Stick-On Tape Speakers, As Predicted By Bruce Sterling
Flexible tape speakers, someday.
Has Climate Change Already Been Solved By Aliens?
'I had explained," said Nessus, "that our civilisation was dying in its own waste heat.' - Larry Niven, 1970.
Skin Electronics 3D Printed
'June's body is a tracery of lambent lines, like some arcane capillary circuitry...' - Paul Di Filippo, 1985
Super-Resolution Microscopy Provides '4D' Views
View the magnified interior of living cells.
Technovelgy (that's tech-novel-gee!)
is devoted to the creative science inventions and ideas of sf authors. Look for
the Invention Category that interests
you, the Glossary, the Invention
Timeline, or see what's New.
Superstrong Multilayer Metal-Graphene Composite Material
Negligible increase in weight increased material strength by hundreds of times.
Deepfakes Imperil Democracy (George Orwell, Right Again)
'All history was a palimpsest, scraped clean and reinscribed exactly as often as was necessary.'
String Art Courtesy Of Robot Artist
The number of different ways to span a thread between a larger number of hooks is astronomical.
Still Wondering If You'd Work For A Robot Boss?
'This is all coming to you courtesy of the simstim unit wired into your deck, of course.'
World's First Autonomous Tram In Germany
What's it like for autonomous trams when they're turned off at night?
Sleeep PRO Earplug For Maximum Rest
'Merton... placed the electrodes of the sleep-inducer on his forehead.'
Inspired By Japan, Nap Pods For Hajj
It's always a good time for a nap.
Amphibio 3D Printed Gill Shirt
'... we can descend and live down there at one of those year-round aquatic resorts.'
How Do You Put An Asteroid Into Earth Orbit? Carefully!
'...she would have to be coaxed by another series of pats into a circular orbit.'
PD Aerospace Space Plane By 2023
'The sleek, tapered space shuttle lay immobile upon the private landing field...'
Foldimate Folds Your Clothes Perfectly
Look ma, my room is clean! I can hear you now.
Robots Help People Get Dressed, As Predicted In 1931
Yes, people of the future, robots will dress you.
International Space Station Leak Plugged - With Finger
'These tag-alongs search out stray leaks.'
Robot Snake Flies, Fights Fires
Just a prototype, but still amazing.
IPAL Chinese Robot Babysitter
'But Nanny is different...'
ZKZM-500 LASER Assault Rifle
'The Iranian reached back into the locker and got a pair of laserifles.'
More SF in the News Stories
More Beyond Technovelgy science news stories