movements
that result in an alternation between two or more separate habitats and which
occur with a regular periodicity, involving a large proportion of the
population.
Potadromous
migrations entirely within freshwater
(Oceanodromous
migrations entirely
within the sea)
Diadromous
migrations between freshwater and the sea - three sub-classes:
1
Anadromous
S →
F
2
Catadromous
F →
S
3
Amphidromous
S ↔
F