Half a century of global decline in oceanic sharks and rays

Nathan Pacoureau, Cassandra L. Rigby, Peter M. Kyne, Richard B. Sherley, Henning Winker, John K. Carlson, Sonja V. Fordham, Rodrigo Barreto, Daniel Fernando, Malcolm P. Francis, Rima W. Jabado, Katelyn B. Herman, Kwang Ming Liu, Andrea D. Marshall, Riley A. Pollom, Evgeny V. Romanov, Colin A. Simpfendorfer, Jamie S. Yin, Holly K. Kindsvater, Nicholas K. Dulvy

Research output: Contribution to journalArticlepeer-review


Overfishing is the primary cause of marine defaunation, yet declines in and increasing extinction risks of individual species are difficult to measure, particularly for the largest predators found in the high seas1–3. Here we calculate two well-established indicators to track progress towards Aichi Biodiversity Targets and Sustainable Development Goals4,5: the Living Planet Index (a measure of changes in abundance aggregated from 57 abundance time-series datasets for 18 oceanic shark and ray species) and the Red List Index (a measure of change in extinction risk calculated for all 31 oceanic species of sharks and rays). We find that, since 1970, the global abundance of oceanic sharks and rays has declined by 71% owing to an 18-fold increase in relative fishing pressure. This depletion has increased the global extinction risk to the point at which three-quarters of the species comprising this functionally important assemblage are threatened with extinction. Strict prohibitions and precautionary science-based catch limits are urgently needed to avert population collapse6,7, avoid the disruption of ecological functions and promote species recovery8,9.

Original languageEnglish
Pages (from-to)567-571
Number of pages5
Issue number7843
Publication statusPublished - 27 Jan 2021


Dive into the research topics of 'Half a century of global decline in oceanic sharks and rays'. Together they form a unique fingerprint.

Cite this