Communication and Perception
External fertilization in Chinook Salmon requires precise communication in order to ensure proper timing of gamete release. During the courtship, which can last up to several hours, the male vibrates and crosses in front of the female, while the female is preparing for spawning by digging the redd. The female has been shown to selectively choose larger males, who vibrate more. A few seconds before depositing her eggs, the female will shake quickly next to the male, inducing sperm release (Berejikian, Tezak, and LaRae, 2001).
Other Communication Modes: vibrations