Description of some of our current and past projects:
Investigation of Atlantic Salmon Smolt Survival Passing Through Turbines of the Mitis 1 Power - Hydro-Québec, Qc, Canada
Station.
This study was performed with salmon smolts obtained from aquaculture which had similar lengths to the downstream migrants observed in the study area in the spring.
The experiment consisted of marking individual fish with a floating device, injecting the specimens in the turbine intake and capturing them downstream of the Power Station.
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Reproduction of Lake Sturgeon (Acipenser fulvescens) in the Western Part of Lake St. Louis - Hydro-Québec, Qc, Canada
The objective of this study was to verify the use in the spring of the Cascades-Nord
area, downstream of the northern part of the Pointe-des-Cascades Dam, by Lake Sturgeon.
A search for eggs was done using drift nets and fishing with gill nets was performed.
Some fish were also tagged for radio-telemetric monitoring.
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Operation and Monitoring of an Eel (Anguilla rostrata) Ladder at the Chambly Dam - Hydro-Québec, Qc, Canada
At the Chambly Dam, on the Richelieu River, a plastic moulded eel ladder was installed by MILIEU
at a 52o slope on a concrete cut-off. MILIEU has been monitoring the passage of eels at the Chambly Dam for over 10 years. A photoelectric eel counter
developed and supplied by MILIEU was also installed to record eel passages.
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Operation and Monitoring of American Eel Upstream Migration at the Beauharnois Power Dam - Hydro-Québec, Qc, Canada
MILIEU has been monitoring the passage of eels at the the Beauharnois
Power Dam for over 10 years. Two eel ladders and two photoelectric eel counters are in place at the Power Dam, one of each at each end of the Dam. The two photoelectric eel counters were
developed and supplied by MILIEU to record eel passages.
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Operation and Monitoring of the Eel-Passage Facility at the Robert Moses Power Dam - New York Power Authority, NY, U.S.A.
MILIEU participated in the design and construction of the eel ladder
at the Robert Moses Generating Station. MILIEU has also been responsible for the operation,
maintenance and monitoring of the Eel-Passage facility during the eel migration period
since 2006.
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Passage Pipe Capacity Study at the Eel-Passage Facility at the Robert Moses Power Dam - New York Power Authority, NY, U.S.A.
The objective of this study was to evaluate the capacity of the passage pipe to pass a large number of eels. This was accomplished by releasing 1,200 eels in
batches over an approximate one-hour period. Eels were released in batches to more closely simulate how eels exit the ladder and enter the passage-pipe system.
The capacity of the passage pipe was evaluated by determining the rate of travel of the eels through the passage pipe.
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Design, Construction, and Installation of an Eel Ladder at the Dam at the Saint-Ours National Historic Site - Parks Canada, Qc, Canada
MILIEU was given the mandate by Parks Canada
to design, construct, and install an eel ladder at the Saint-Ours Dam located on the
Richelieu River. MILIEU monitored the passage of eels at the
the eel ladder for three years.
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Validation of the Efficiency of the Fishway at the Dam at the Saint-Ours National Historical Site - Parks Canada, Qc, Canada
The objective was to monitor the movement of all fish travelling in the multispecies fishway and to characterise the
hydraulic conditions in the fishway. One of the objectives of this project was to monitor the passage of five fish species, of which the populations are in precarious states
(i.e. Copper Redhorse, River Redhorse, American Shad, Lake Sturgeon, and American Eel).
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Survival Study of Downstream Migrating American Eels Passing Through Turbines at the Beauharnois Power Dam - Hydro-Québec, Qc, Canada
When the generation of electrical power was at its maximum at the Beauharnois Power Station, a study of eel survival after
passage through turbines, either of Francis or Propeller types, was undertaken. Eels were launched in the turbines
and their survival was assessed.
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Transport of Adult American Eels Trapped in the Upper St. Lawrence and in Lake Ontario, and Release into the Lower St. Lawrence River - Ontario Power Generation, On, Canada
Previously one of the most abundant fish species in the St. Lawrence River, the American Eel (Anguilla rostrata) population has declined
since the 1980s. This decline is in part attributed to the mortality of eels passing through turbines of hydroelectric dams. The objective of these studies were to test a
possible mitigation strategy for turbine mortality which involves the trapping of large yellow eels in the upper St. Lawrence River and Lake Ontario (Ontario waters),
their transport and re-introduction into the lower St. Lawrence River.
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Operation and Monitoring of the Eel-Passage Facility at the R.H. Saunders Generating Station - Ontario Power Generation, On, Canada
MILIEU was responsible for the operation,
maintenance and monitoring of the Eel-Passage facility during the eel migration period. MILIEU
was notably responsible for the operation of the photoelectric eel counter and the PIT tag reader.
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Monitoring of the Downstream Migration of American Shad and Testing of a Sound Barrier at the Rivière-des-Prairies Generating Station - Hydro-Québec, Qc, Canada
The effect of periodic shutdowns of the generating station and discharges through the spillway on the downstream
migration of adult American Shad was assessed. The study also aimed at assessing a sound barrier on shad behavior.
The ultrasonic barrier, made up of transducers operating at 125 KHz, was installed and the accoustic
echoes from one scanning sonar were used to calculate an abundance index for American shad in front of the generating station.
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Managing the Project for the Design, Construction, and Installation of a Seasonal Lamprey Barrier - U.S. Fish and Wildlife Services, VT, U.S.A.
MILIEU is presentely managing the project for the design, construction, and installation of a flow-through screen barrier that will be operational
from April to mid-June on the Morpions Stream during the upstream migration of adult Sea Lampreys. Presently, the unimpeded
Morpions Stream provides almost 30 km of suitable spawning and rearing habitat for Sea Lampreys. Control programs for Lamprey
populations are essential since this species has been and continues to devastate various fish communities, such as Lake trout, in Lake Champlain.
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Avoidance of Light by American Eel in the Headrace of Les Cèdres Generating Station - Hydro-Québec, Qc, Canada
The objectif of this study was to assess the potential of using artificial light to guide adult eels over a long distance
in the St. Lawrence River. Adult eels were tagged with accoustic tags surgically implanted and their movement in
the light zone was recorded.
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Design and Fabrication of Eel Ladders - Allegheny Energy Supply, U.S.A.
MILIEU desgined and fabricated eel ladders for the Lurray Hydroelectric Station in Virginia, for the Warren Dam in West
Virginia, and for the Millville Dam in West Virginia.
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Design and Fabrication of Eel Ladders - Brookfield Power, U.S.A.
MILIEU desgined and fabricated eel ladders on the Raquette River for Norwood and Norfolk Hydroelectric Stations and for Raymondville, East Norfolk and Yaleville Dams in New York State.
MILIEU also designed and fabricated eel ladders on the Oswego River for the Minetto, Fulton, and Oswego Falls Dams in New York State.
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Provide Elver Ramp - Dominion North Carolina Power, U.S.A.
MILIEU provided the elver substrate for the eel ladders at the Roanoke Rapids Power Station and Dam in North Carolina.
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Design and Fabrication of an Eel Ladder - Oswego City, U.S.A.
MILIEU desgined and fabricated an eel ladder for the High Dam in New York State.
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