Overview of Fish Biology and Interactions With Roads
Module Outline
PPT Slide
Fundamental Problem of Culverts
Fish Movement and the Road Network
Salmonid Life Cycle
Barriers to Fish Passage (adapted from Dane 1978)
Road-crossing barriers in a watershed act as filters that determine the amount of habitat available to each species and age-class of fish!
Estimated Frequency of Barriers
Nutrient Supply from Salmon Carcasses
If we build it, they will come...
Culverts from the Fish Eye View
Identifying Your “Design Fish”: Example Freshwater Residence Period by Species and Life Stage (Siletz River, Oregon) .
Get help from an ODFW fisheries biologist or ODF FPF when deciding on your “design fish” and in-stream work window!
In-Stream Work Impacts
Migration and Spawning
Rearing
Sediment in Redds
In-Stream Guidelines (www.dfw.state.or.us/hcd/timing/ timing.html)
Design Flow
Characteristics of Problem Culverts
Water Velocity Barriers
Stream vs. Culvert
How Culverts Become Velocity Barriers
Velocity Barriers
Fish Swimming Ability
Relative Swimming Speeds by Species and Fork Length (Bell 1986)
WDFW Juvenile Coho Fish Passage Study
Maximum Velocity Permitting 80% Passage for Coho Fry and Fingerlings
Maximum Slope Permitting 80% Passage Rate for Coho Fry and Fingerlings
How Fish Navigate Culverts
Juvenile Passage Zones
Outlet Drop Barriers
Jumping Ability of Fish
Ideal Jumping Conditions
Water Depth Barriers
Other Considerations
Culvert and Fish Passage Information Sources
Closing Remarks
Home Page: Fish Passage Short Course