• Many fish appear to hang effortlessly in the water while they wait for prey, defend a nest or pause between bursts of activity. • But our research shows that this quiet stillness is anything but effortless. • Hovering, the behavior that allows a fish to remain suspended in one place, is far more energetically demanding than scientists once believed.
Article Summaries:
- New research reveals that the seemingly effortless hovering of fish-remaining suspended while waiting for prey, guarding nests, or pausing between bursts-requires far more energy than previously assumed. Scientists measured metabolic rates during this behavior and found that maintaining stillness demands significant muscular effort, challenging the long‑held view that hovering is energetically cheap. The findings suggest that fish must balance the benefits of stealth or defense against the higher energetic cost, potentially influencing how they allocate time to feeding, reproduction, and rest. This insight reshapes our understanding of fish energetics and behavior in aquatic ecosystems.
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