BARRIERS TO FISH MIGRATION
For most freshwater fish, getting to and from the places they need to spawn and complete their life cycle. This can be made difficult and even impossible due to man made constructions like dams and culverts.
Fish Migration upstream/downstream
The successful life cycle for many fish depends on reaching the headwaters of rivers and streams.
LINKS:
The fish highway - Science learning hub
Science learning hub ‘Streams works for fish.’
Barriers to fish passage
Weirs and culverts can prevent fish from completing their migration process.
LINKS:
BOP regional council fish passage fact sheet
NIWA - New Zealand fish passage guidelines
NIWA - Fish passage assessment tool
Auckland council - caring for urban streams - fish passage