Fish passage Flashcards
What do fish passages do?
- control invasive species
What is an example of an invasive species that passages control?
- sea lamprey are parasitic to commercial species
What are the main characteristics of low head barrier dams?
- 0.4 - 2m in height
- overhanging lip (15-30cm)
- plunge pools
What do barrier dams do?
- impede movement of fish
How many barrier dams are in the great lakes basin?
61
What does the overhanging lip on barrier dams do?
- lamprey can scale wall vertically but cannot pass the lip
What are typical fishways built for?
- reproduction
What are typical fishways?
- partial barrier slots
- disrupt flow –> fish can pass
What are the 2 main types of typical fishways?
- vertical slot
- denil
Explain how a vertical slot works
- positive rheotaxis (swim into flow)
- exert force past “gates”
- rest and recover between to repay O2 debt (low flow area)
- 2nd sprint to rest
vertical slot fishways require _____ swimming. Explain.
- burst
- high flow area, anaerobic (use white muscle) and have oxygen rest
Explain denil fishways
- plate with U shaped opening; mounted at an angle
- easier to flow upstream at lower flow
denil fishways require ____ swimming
- prolonged
Explain rotary valve assembly
- fish attracted by controlled stream flow, enter rotary valve (positive rheotaxis)
- exit valve and continue upward (buoyancy = positive = efficient)
What is a passive integrated transponder (PIT) tags?
- track individual fish when they pass through an array
- ex. downstream migration of juvenile salmonids
What are satellite pop-up tags?
- float to surface and transmit data
- large tags on large fish
What is electromyogram telemetry?
- muscle activity and locomotion at different depths
What are doppler flow probes
- measure speed
What does biotelemetry record?
- location
- depth
- speed
- muscle activity