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 |

Would you like to contribute a story tip? It's easy:
Get the URL of the story, and the related sf author, and add it here.

Comment/Join discussion ( 2 )

Related News Stories - (" Engineering ")

Crazyflie Drone Swarm Technology
'...Programmed to hang in space in a hexagonal grid pattern.' - Neal Stephenson, 1995.

L16 Revolutionary Optics Spells End For Ordinary DSLRs?
Time for Esper Photo Analysis, Blade Runner fans.

MIT Tunes Ions For Frictionless Surface - Superlubricity!
'My telelubricator here neutralizes the interatomic bonds the surface of any solid...' - L. Sprague de Camp, 1940.

RFly Drones Rule The Warehouse
'The wasp homed unerringly on the face of the honeycomb...' - James P. Hogan, 1979.

 

Google
  Web TechNovelgy.com   

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.

 

 

 

 

 

Current News

Dubai Scorpion Police Hoverbike Ready To Pull Young Kirk Over
'Is there a problem, officer?'

HEXA Robotic Help For Plants
Then some unknown race had chanced upon the dreamers and decided to "help them out."

Korean Tesla Model S Video 'Excelsior' Is Indeed Our Motto
'Improving man by bringing him close to Nature, while they combine the sensations of coasting with the interest of seeing the country well...'

DIY Robot Shoots You In The Face
'...there were automatic guns that fired ligamine darts.'

A Bayesian Approach to Safe Imitation Learning For AIs and Robots
Um, how about that pension for the humans who serve as the models for robot behavior?

Qoobo Headless Robotic Therapy Cat Was Anne McCaffrey's Idea
'...used as surrogates in intense dependency cases.'

Autonomous Cars Talk To Each Other At MCity
'My cars talk to one another.'

PUFFER Robots - From Philip K DIck's Second Variety?
'Across the ground something small and metallic came, flashing in the dull sunlight of midday.'

Russian Space Garden
'We saw the gardens, flooded with artificial sunlight...'

Targeted Neuroplasticity Training For 'Downloading Skills'
'I know kung-fu.'

U of M's MCity To Feature Asimov's Automatobuses
Should you turn autonomous buses off?

Crazyflie Drone Swarm Technology
'...Programmed to hang in space in a hexagonal grid pattern.'

Our GodBot, Who Art In Cyberspace
Vaal hungers! We must serve him.

easyJet Short-Haul Electric Jets
Have a little faith, will you? They're working on it.

Meet Assist-e Honda's Self-Balancing Motorcycle
'He had never ridden any motorized device that lacked onboard steering and balance systems...'

Kalashnikov's One-Seater Hovercraft
Not for windy days.

More SF in the News Stories

More Beyond Technovelgy science news stories

Home | Glossary | Invention Timeline | Category | New | Contact Us | FAQ | Advertise |
Technovelgy.com - where science meets fiction™

Copyright© Technovelgy LLC; all rights reserved.