Do trout defend their spawning areas?

Fiercely, while spawning is under way — but only until it ends. A female rainbow or brook trout defends the redd she is cutting, driving off other females and egg-eating intruders, while males fight each other over access to her; a spawning riffle is a continuous low-grade battlefield. This aggression is exactly why targeting fish on redds is poor sport: they attack anything near the nest out of defense, not feeding, and every fight costs energy the spawn needs. Once spawning finishes, defense stops dead — trout provide no parental care, and the gravel itself is the only guardian the eggs get. Lake trout skip territorial defense entirely, broadcasting eggs communally over shoals at night.

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