SCIENCE•March 7, 2026

Can sharks smell blood from miles away?

Official Determination
MISLEADINGEvidence Consensus: Verified
Submit Related Claim→

Short Answer

Sharks possess exceptional olfactory sensitivity, but odor molecules must physically drift through ocean currents to reach their nostrils.

Detailed Explanation & Evidence

Sharks can detect amino acids in concentrations as dilute as one part per 25 million to one part per 10 billion depending on species. However, scent transmission relies on hydrodynamic dispersion. In calm or counter-current waters, smell molecules travel slowly. Unless currents carry the plume, a shark miles away will receive zero stimulus.

Sources & Peer-Reviewed References

2 Citations Indexed
  1. 01

    Meredith, T. L., & Kajiura, S. M. (2010). Olfactory morphology and sensitivity in elasmobranchs. Journal of Experimental Biology.

  2. 02

    Florida Museum of Natural History Shark Research Olfaction Guide.

Have another myth you want investigated?

Our editorial team evaluates claims based on empirical research and scientific consensus.

SUBMIT A MYTH NOW→