Ready-to-run solutions
MILIEU designs and
manufactures complete eel ladders for hydroelectric dams and generating
stations. Our eel ladders are recognized as the most efficient and
durable in North America.
The eel ladders designed by MILIEU consist of an aluminum trough which
holds and supports the plastic climbing ramp. This ramp, or substrate,
includes plastic anchors to provide traction. The trough is equiped
with hinged covers that provides a dark environment to encourage
migration. MILIEU's exclusive photoelectric eel counter can be included
in the design of the eel ladder, offering a reliable and simple method
of counting the number of eels transiting the eel ladder.
Some eel ladders designed and manufactured by Milieu Inc :
- Luray Generating Station,Virginia, United States
- High Dam, New York, United States
- Raquette River,Norwood and Norfolk Generating Stations, New York, United States
- Raquette River,Raymondville, East Norfolk and Yaleville Dams, New York, United States
- Oswego River, Minetto, Fulton and Oswego Falls Dams, New York, United States
- Warren Dam, Western Virginia, United States
- Millville Dam, Western Virginia, United States
- Chambly Dam, Québec, Canada
- St. Ours Dam, Québec, Canada
MILIEU has designed and fabricated a
photoelectric eel counter for juvenile eels (> 150 mm). It was
designed to count eels as they exit a pipe, particularly at the exit of
an eel ladder or an eel trap. The operation of the counter is based on
the use of a beam of modulated infrared light sent out continuously in
front of a conduit where eels are lead to pass.
MILIEU is the sole manufacturer of this photoelectric counter.
MILIEU manufactures a substrate made of plastic studs for eel ladders and eel traps. The climbing ramp is molded in ABS plastic and it has a series of staggered studs that the eels push against as they climb the eel ladder or eel trap. The sides of the ramp are also undulating which facilitates the upward movement of eels.
The modular ascending ramp targets the passage of juvenile eels that measure between 150 mm and 800 mm. With this module, eels can climb a trap or a ladder installed at an angle of up to 55°. This ramp has been extensively tested since 1998 and has been shown to be very efficient and durable.
The substrate has also been used successfully to trap sea lamprey, in Ontario by Dr Gordon McDonald and in Michigan by Peter Hrodey and Ulrich Reinhardt. No modification to the product is necessary for this purpose.
Click the image to view full-size or save it to your computer.
MILIEU recently developped a climbing ramp for eels smaller than 150 mm. The product is molded in ABS plastic and it has a series of staggered studs that the eels push against as they climb the eel ladder or eel trap. The sides of the ramp are also undulating which facilitate upward movements of eels.
Click the image to view full-size or save it to your computer.
MILIEU has developped several specialized software for the recording, display and analysis of fish related data.
Passive Integrated Transponders (PIT) tags
This Microsoft Windows software records PIT tag data and is compatible with Biomark's FS2001 field reader. It allows real time recording of additional morphological data in addition to easy exporting to Microsoft Excel compatible files.
Side-scan sonar
MILIEU uses Humminbird side-scan sonars to record the American Shad migration in the Montreal region. The raw recordings created by the sonars are transformed and analyzed using our proprietary software in order to obtain precise data of fish migration patterns.
Scanning sonar
At the Rivière-des-Prairies Generating Station, MILIEU routinely installs Imagenex scanning sonars to monitor the migration of American shads. The software developped by the company controls the sonar, records the data, and analyses the returns in real-time.This gives administrators added flexibility when determining the best conservation strategy. Extra analysis can also be performed, such as fish density maps in the viewing area for controlled periods of time.
