The elasmobranchs of Malpelo Flora and Fauna Sanctuary, Colombia.

Management and conservation actions in marine-protected areas require baselines for monitoring threatened marine fauna such as elasmobranchs. This article provides evidence of the occurrence of 34 species of elasmobranchs (21 sharks and 13 batoids) in the Malpelo Flora and Fauna Sanctuary, Colombia, including five new records of sharks and three of rays. From 1987 to 2021, new records were obtained by underwater visual census using SCUBA, manned submersibles and deep-ocean cameras to depths of up to 2211 m.

Concentrations of Silver, Chrome, Manganese and Nickel in Two Stranded Whale Sharks (Rhincodon typus) from the Gulf of California.

Concentrations of Ag, Cr, Mn and Ni were measured in tissues of two whale sharks (Rhincodon typus) stranded in La Paz Bay (LAP) and Punta Bufeo (PB), Gulf of California, during 2017 and 2018. The concentration range of Ni (0.012-1.

Residency and diel movement patterns of the endangered scalloped hammerhead Sphyrna lewini in the Revillagigedo National Park.

This study is the first description of the residency and diel movements of Sphyrna lewini at the Revillagigedo National Park, Mexico. Eleven adult scalloped hammerheads of total length 200-300 cm were monitored using acoustic telemetry during 2013-2015 at four sites at San Benedicto Island. Diel and residency patterns were described based on 58,055 detections by four autonomous receivers.