Fish passage Flashcards
1
Q
What do fish passages do?
A
- control invasive species
2
Q
What is an example of an invasive species that passages control?
A
- sea lamprey are parasitic to commercial species
3
Q
What are the main characteristics of low head barrier dams?
A
- 0.4 - 2m in height
- overhanging lip (15-30cm)
- plunge pools
4
Q
What do barrier dams do?
A
- impede movement of fish
5
Q
How many barrier dams are in the great lakes basin?
A
61
6
Q
What does the overhanging lip on barrier dams do?
A
- lamprey can scale wall vertically but cannot pass the lip
7
Q
What are typical fishways built for?
A
- reproduction
8
Q
What are typical fishways?
A
- partial barrier slots
- disrupt flow –> fish can pass
9
Q
What are the 2 main types of typical fishways?
A
- vertical slot
- denil
10
Q
Explain how a vertical slot works
A
- positive rheotaxis (swim into flow)
- exert force past “gates”
- rest and recover between to repay O2 debt (low flow area)
- 2nd sprint to rest
11
Q
vertical slot fishways require _____ swimming. Explain.
A
- burst
- high flow area, anaerobic (use white muscle) and have oxygen rest
12
Q
Explain denil fishways
A
- plate with U shaped opening; mounted at an angle
- easier to flow upstream at lower flow
13
Q
denil fishways require ____ swimming
A
- prolonged
14
Q
Explain rotary valve assembly
A
- fish attracted by controlled stream flow, enter rotary valve (positive rheotaxis)
- exit valve and continue upward (buoyancy = positive = efficient)
15
Q
What is a passive integrated transponder (PIT) tags?
A
- track individual fish when they pass through an array
- ex. downstream migration of juvenile salmonids
