Projects
Our projects
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- American Eel
- American Shad
- Lake Sturgeon
- Salmon
- Sea Lamprey
- Lake Trout
American Eel Migration at the Beauharnois Dam
MILIEU has been monitoring the
passage of eels at the the Beauharnois Power Dam for the past 20 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.
Learn
more Eel-Passage Facility at the Robert Moses Power Dam
MILIEU participated in the design
and construction of the eel ladder at the Robert Moses Generating
Station on the Saint Lawrence River. MILIEU has also been responsible
for the operation,
maintenance and monitoring of the Eel-Passage facility during the eel
migration period since 2006.
Learn
more Monitoring of an Eel Ladder at the Chambly Dam
At the Chambly Dam, on the
Richelieu River, a plastic moulded eel ladder was installed in 2002 by
MILIEU 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.
Learn
more American Eel Telemetry in the Beauharnois Canal
In 2017 and 2018, Hydro-Québec mandated MILIEU to install an acoustic telemetry array in the Beauharnois Canal to monitor downstreammigrating American eels.
Learn
more Fish Migration Infrastructure at the Vianney-Legendre Dam
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. Furthermore,
MILIEU worked at the
new multi-species facility to optimize its operation.
Learn
more Transport of Adult Eels along the Saint Lawrence River
Along with MILIEU,
Ontario Power Generation (OPG) designed a strategy to mitigate the
impact of downstream migrating adult eel mortality in hydroelectric
turbines. Adult eels are fished in St-Francis Lake, transported by
truck and released
downstream in the St-Louis Lake.
Learn
more American Shad Migration Monitoring
Periodic shutdowns
of the generating station are performed to help with the
downstream migration of adult American Shad. The study
also aims at assessing a sound barrier on shad behavior. The barrier is
installed yearly and the accoustic echoes from scanning sonars are used
to
calculate an abundance index.
Learn
more American Shad Guidance Trials in the Montreal Region
MILIEU works with the
Institut de Recherche d'Hydro-Québec to verify if downstream
migrating
American Shads can be guided away from the Des Prairies River entrance.
The use of alternative ways allows the shads to bypass the
hydroelectric facility downstream and thus
increase
survival rates.
Learn
more Design and Construction of a Seasonal Lamprey Barrier
MILIEU managed a
project for the design, construction, and installation of a
flow-through screen barrier on the Morpions Stream. The previously
unimpeded Morpions Stream provides a large spawning and rearing habitat
for Sea Lampreys, who
have a sizable impact on the Lake Champlain ecosystem.
Learn
more Design and Fabrication of Eel Ladders - Raquette River
MILIEU designed 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.
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more Design and Fabrication of Eel Ladders - Shenandoah River
MILIEU designed 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.
Learn
more Smolt Survival at the Mitis Dam, Quebec
The survival of smolts going
through the Mitis-1 Power Dam was assessed by MILIEU. The smolts were
tagged, released into the turbine and collected downstream.
Learn
more Eel Migration at the Carillon Dam
The Carillon Dam impedes the
upstream migration of juvenile eels in the
lower reaches of the Ottawa River. Traps and PIT tagging were used in
order to to assess the density and behaviour of the eels.
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more Light Avoidance by Migrating Adult Eels
In 2004, Hydro-Québec and MILIEU
conducted a study in the Les Cèdres Generating Station intake canal to
assess the potential of three types of light sources to guide adult
eels over long distance in the St. Lawrence River.
Learn
more Lake Sturgeon Reproduction in Western Lake St. Louis
The Lake Sturgeon is a closely
watched species because of its precarious status and its historical
importance to the commercial fishing industry. MILIEU conducted a study
to determine if the west of Lake St. Louis was used by
sturgeon as a spawning ground.
Learn
more Elver Substrate -
Roanoke River
Elver-specific substrates created
by MILIEU was used by Dominion North Carolina for their eel ladders on
the Roanoke River.
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more Design and Fabrication of an Eel Ladder - Saint-Lin
MILIEU designed and fabricated two eel ladders on the L'Achigan River, in the Lanaudière region, Quebec. One of them is located in downtown Saint-Lin and is equipped with an electronic eel counter.
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more Design and Fabrication of an Eel Ladder - L'Épiphanie
MILIEU designed and fabricated two eel ladders on the L'Achigan River, in the Lanaudière region, Quebec. One of them is located in L'Épiphanie and is equipped with an electronic eel counter.
Learn
more Eel Migration at the Penman's Dam
In 2013, MILIEU designed and performed a study for the City of Saint-Hyacinthe. Two traps were set-up to investigate eel presence in the Yamaska River.
Learn
more Lake trout reproduction in Cabot Lake
In 2015, MILIEU installed scanning sonars in Cabot Lake in order to detect spawning Lake Trout.
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