Adult Radiotelemetry (1996-2004)
Event Summary Query
Approach: Detection of a fish near the base of
a dam; records are 'coded' for the first and any subsequent approaches
to a dam. Efficiencies are not calculated for approaches as they are
not associated with a specific route at the dam.
Entrance: a location in a dam
structure where there is access to the fish ladder system for migrating
adult salmonids. Fish entrances are noted and tallied at entrances with
Exit: the action of a fish
leaving a fishway through a downstream path after it has entered a dam
Fallback: an event in which a fish is detected
at a location downstream of a dam after having been above that dam.
These are determined either by records showing the fish's actual
passage route back over a dam, or assumed when a fish is recorded
downstream of a dam after it has originally passed. Fallbacks are one
source of delay in a fish's migration, or can occur if a fish overshot
its natal stream.
Passage: the act of traversing a
dam as part of the upstream spawning migration. Passage times are
calculated based on the time of a fish's first approach to a dam and
the last detection of that fish at the top of a fish ladder.