Spawning tactics of female Miyabe charr (Salvelinus malma miyabei) against egg cannibalism

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Abstract
The number of times a female Miyabe charr, Salvelinus malma miyabei, will spawn in a single nest decreases with the number of males resident in the stream (so-called sneakers or streakers) that are gathered around the breeding pair. The cumulative egg-predation attempts of resident males probably increases with their number. Females apparently distinguish between fertilization and egg-eating attempts of resident males. From our observations that females deposit more eggs during the first spawning in a nest, we have developed a simple graphical model to suggest that this behaviour has evolved as a tactic against egg predation by resident males in the stream.

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