Paired-laser photogrammetry as a simple and accurate system for measuring the body size of free-ranging manta rays Manta alfredi

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Size and structure of a photographically identified population of manta rays Manta alfredi in southern Mozambique (2011, background): “Manta rays have natural markings on their ventral surface from birth (Beebe and Tee-Van 1941; Marshall et al. 2008) that allow for individual identification ( Deakos 2010; Kitchen-Wheeler 2010; Marshall and Bennett 2010a).”
Research Priorities to Support Effective Manta and Devil Ray Conservation (2018, background): “Maturity assessments of mobulids are based primarily on external morphological cues, such as changes in clasper morphology in males, and the presence of visual signs of mating or pregnancy in females (Deakos, 2010; Marshall and Bennett, 2010; Stevens, 2016) (Figure 3).”
Characteristics of a manta ray Manta alfredi population off Maui, Hawaii, and implications for management (2011, methodology): “The DW of 154 different individuals from this population was measured using paired-laser photogrammetry (Deakos 2010), and all values were >2.5 m.”
Movements and habitat use of reef manta rays off eastern Australia: offshore excursions, deep diving and eddy affinity revealed by satellite telemetry (2014, methodology): “Prior to tag deployment, each individual was identified, its size (disc width, WD) was estimated and its sex was determined using con- ventional manta ray photographic identification and laser photogrammetry techniques (Deakos 2010, Couturier et al. 2011, Marshall & Pierce 2012).”