Damselfish can be fastidious farmers. They prune and cultivate small patches of algae, often no more than half a square meter (5 square feet) in area, ensuring they have a steady food source. One species in the Caribbean even herds tiny mysid shrimp around their underwater “gardens,” which the shrimp dose with their fecal fertilizer. … Continue reading Invasive rats topple ecological domino that affects reef fish behavior