Spawning and Reproduction Flashcards
Homing
to return to ones natal area
Straying
NOT returning to ones natal area
Olfaction
a fish’s sense of smell
Escapement
Portion of fish population that “escapes” predators, fisheries, etc., and is able to spawn naturally
Fecundity
The number of eggs per female spawner
Redd
area of stream/lake bottom excavated by female salmonids during spawning
Olfactory hypothesis
Rivers differ in chemical composition, differences are constant over season/years, fish are attracted to learn odors and can smell their natal system
Imprinting
special form of learning that takes place during smolting, involves no reward or punishment, that is retained over long periods of time without reinforcement
Sign stimulus
detection of odors from natal sites stimulate salmon to swim upstream; absence of odors salmon swim downstream; along coastline salmon will investigate but not ascent if odor is absent
Order of salmon species spawning
Chinook, sockeye, and pink first; coho second; chum last
Optimal spawning conditions
Flow, gravel, depth, competition
