Scalloped hammerhead shark Sphyrna lewini relative abundance comparison in three offshore marine protected areas of the Eastern Tropical Pacific

Bravo-Ormaza, Estefanía; Arauz, Rándall; Bessudo, Sandra; Hearn, Alex; Klimley, A. Peter; Archila, Felipe Ladino; López-Macías, Jean; Steiner, Todd; Peñaherrera-Palma, César

doi:10.1007/s10641-023-01454-6

Cited by 1 publication

(1 citation statement)

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“…S. lewini is also characterised by occurring in large aggregations (Harned et al, 2022), particularly at oceanic seamounts (Klimley, 1993). Large aggregations continue to be documented in the Pacific Ocean (Ketchum et al, 2014;Aldana-Moreno et al, 2019;Bravo-Ormaza et al, 2023), including in shallow waters (Lòpez et al, 2022) and near known nursery areas (Brown et al, 2016). In the Atlantic, however, there have been no recent records of aggregations except for an oblique reference to an aggregation in the Gulf of Mexico by Hoffmayer et al (2013).…”

Section: Introductionmentioning

confidence: 99%

Renewed occurrence of schooling scalloped hammerhead (Sphyrna lewini) and of great hammerhead (S. mokarran) sharks in the Cayman Islands

Gore,

Kohler,

Ormond

et al. 2024

Front. Mar. Sci.

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The scalloped hammerhead shark (Sphyrna lewini), a critically endangered species with a decreasing global population, is characterised by its occurrence in large schools. Such schools are still observed today in the Pacific Ocean, but this is generally not the case in the Atlantic Ocean, and in the Cayman Islands not since the 1970s. Here we report a recent record of a school of S. lewini in deep water off Grand Cayman, and describe a recent, concomitant increase in numbers of the species, and its critically endangered congener, the great hammerhead (Sphyrna mokarran), around the Cayman Islands. Relative population trends and seasonal patterns were assessed using data from shallow and deep-water BRUVS, scientific longlining, citizen science projects including the Sharklogger Network and REEF, and social media reports. It appears that S. lewini may be slowly re-occupying the area, selecting and using deeper waters to school, while S. mokarran has also become less scarce than hitherto.

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