Effects of introduced trout predation on non-diadromous galaxiid fish populations across invaded
Building Fishways to Restore Diadromous Fishes to Connecticut...•By mid 1700s small dams on...
Transcript of Building Fishways to Restore Diadromous Fishes to Connecticut...•By mid 1700s small dams on...
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Building Fishways to Restore DiadromousFishes to Connecticut
Stephen GephardCTDEP/Inland Fisheries Division
Old Lyme, CT
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Anadromous•Matures in saltwater•Spawns in freshwater
Catadromous•Matures in freshwater•Spawns in saltwater
DiadromousFish that migrate betweenfresh and salt water
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DAMS !!
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MILLS Each town had them and that meant dams
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•By mid 1700s small dams on tributaries (especially SouthernNew England) blocked fish access to upstream habitat -extirpated local runs
•~1740- salmon are gone from the Housatonic River.•~1780- salmon are gone from all CT tribs of the CT River.•1798 - 1st dam across the CT River in Turners Falls, MA.•1799 - 1810 – Salmon “already in the system” continue to return•~1811 - Connecticut River Atlantic salmon extinct•1830- first mainstem dam on the Shetucket River•1845- Shetucket River Atlantic salmon extinct- shad reduced.
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The impacts of dams have not been limited to diadromous fish species
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The impacts on these species have not been limited to just dams
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WHY DO FISH NEED TO GO UPSTREAM?
Fish need adequate amounts of habitat to support their young.
Extension services say that horses need about 1.5 – 3 acres of pasture to be sustained.
Fish have such minimum habitat requirements, too. One acre of habitat may support 50 American shad or 1,000 alewives.
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WHY DO FISH NEED TO GO UPSTREAM?
Mill Brook has 500 acres upstream of the salt wedge and therefore
could support a half million alewives
But if you build a dam a few miles upstream and reduce the amount of AVAILABLE habitat
to 100 acres, the brook can only support 100,000 alewives.
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It’s the habitat, stupid!
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BLUEPRINT FOR RESTORING FISH RUNS
Identify existing runs of fish
Identify existing barriers to fish runs
Identify suitable habitat upstream of barriers
Identify potential restoration projects
Reintroduce fish to system (if necessary)
Provide fish passage at barriers
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Species that are valued by residents
Species for which suitable habitat remains
Atlantic salmon- Connecticut River basin only
American shad- Housatonic, Quinnipiac, Connecticut, Shetucket, Quinebaug rivers
River herring in dozens of streams, statewide
American eel- where surveys show dams have reduced upstream numbers
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Other Species
Sea-Run Brown Trout
•striped bass
•gizzard shad
•hickory shad
•white perch
•rainbow smelt
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Sea lamprey
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American shad
Alewife
Blueback herring
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Adults spawn in river in June
Juveniles leave river in October
Sub-adult grow off of coast for four years
Adults return to river of origin to spawn
Life History
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0
100000
200000
300000
400000
500000
600000
700000
1984 1986 1988 1990 1992 1994 1996 1998 2000 2002 2004
Year
Num
ber
Pass
ed o
ver
Hol
yoke
2001 = 10,6032002 = 1,9392003 = 1,392
Numbers of blueback herring passed at the Holyoke Fishlift
2006 = 21
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FISH PASSAGE
A project or activity that allows fish to get from point A to point B safely, typically where a human-made structure that inhibits fish movement is located between the two points and additional human intervention is required.
A
B
Not just upstream, either.
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FISH PASSAGE
Typical options include:
• removal of the structure
• modification of the structure
• building of a fishway around the structure
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Important Facts
• swimming and leaping abilities vary greatly among fish species. Solutions have to be design to match these abilities.
• generally, the weaker swimming fish require more expensive fishways.
• due to limited space and money, most fishways do not pass all fish that arrive at the base of the dam. Typically, the strongest swimmers pass and the others stay behind.
• fishways need to be designed, operated and maintained.
• fishways pass fish but other impacts of the dam remain.
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Large fish and numerous fish in large rivers usually requires large fishways ($$$$)
• damowners who generate and sell electricity must be licensed and fishways are often a condition of that license.
• In CT, if owners of dams that are NOT licensed repair or modify their dam, they need a DEP permit. A fishway can be a condition of that permit.
• As the public learns more about fish restoration, more and more dam owners are seeking to build fishways at their dams voluntarily. These are generally smaller dams.
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HOLYOKE FISHLIFT
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River Herring- passage around dams
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A “steeppass” fishway
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Jordan Millpond
Fishing Brook
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CLARK’S POND FISHWAY- A POOL & WEIR
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CHALKER MILLPOND FISHWAY
SOME FISHWAYS CAN BE QUITE SMALL– BUT STILL IMPORTANT
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LOWER GUILFORD LAKE NATURE-LIKE
FISHWAY
A formerly impassable branch of a stream made passable by the
construction of a 1 on 14 rocky ramp right in the stream.
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NOD BROOK CULVERT FISHWAY
Off-set baffles installed within a box culvert
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If you’re building a fishway, what else can you do besides passing fish upstream?
• viewing window
• count fish
• identify fish
• trap fish
• educate the public
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River Herring- electronic fish counter
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LATIMER BROOK FISHWAY TRAP
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•Catadromous•Spawns at depth in Sargasso Sea and dies •Juveniles remain in larval stage for one year, riding the
Gulf Stream•As larvae near coast, transform into glass eels (2 - 4”)•Arrives in freshwater beginning late winter - ?•Males seem to stay in lower rivers & estuaries•Females head upstream•Develop into elvers (6 - 10”)•“Highly motivated migrants” - able to climb low-head
barriers•Remains in freshwater as yellow eels for many years (10+)•Mature into silver eels late summer - early fall•Migrate back to sea during fall high water events
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Getting eels over barriers…
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Cooperative Fish Passage Projects
• state DEP has no budget for building fishways
• with limited staff, don’t want to own many
• local sponsors/owners mean local buy-in
• lots of funding vehicles available
• most projects have multiple partners
• DEP/IFD maintains technical control, provides technical assistance every step of the way, including longterm operation.
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Hallville Pond Fishway Project
A cooperative project with the Eastern Connecticut Conservation District
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Conceptual Plan- top viewA 12 ft high
steeppass fishwaywith one resting pool, a viewing window, and
an electronic fish counter
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Conceptual plan- profile view
Targeting alewife, blueback herring, sea-run trout
Dam associated with an old paper mill.
Owners cooperative (no cost to them) but need to be
accommodated.
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It’s the habitat, stupid!
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It’s the habitat, stupid!
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Fishways Help Get Fish Home
Thames River
Connecticut River
Pawcatuck River ?