The Bentfin Devil Ray is usually pelagic or epipelagic in shallow, productive, neritic waters of <100 m depth (Notarbartolo di Sciara 1988, Croll et al. 2016), although it is also caught in offshore pelagic waters (Mas et al. 2015), and around seamounts in the Mid-Atlantic Ridge (Mendonça et al. 2012). Segregation by size and sex is seasonal, with all size classes and sexes appearing together during the summer months (Notarbartolo di Sciara 1988). The species is observed either solitarily or in small groups (2-“6 individuals); it is not a schooling species (Notarbartolo di Sciara 1988). Maximum size is reported to at least 189 cm disc width (DW) and both females and males are estimated to mature at around 154 cm disc width (DW), while size at birth is estimated at 65-“85 cm DW (Notarbartolo di Sciara 1988, Last et al. 2016). Size at 50% maturity was estimated at 153.8 cm DW for males (White et al. 2006b). The mode of reproduction is matrotrophic viviparity. Embryos obtain nutrients initially via yolk, then through absorption of enriched uterine fluid from the mother (Wourms 1977). Only the left ovary is functional and litter size is one pup after a 12-month gestation period (Wourms 1977, Notarbartolo di Sciara 1988). It is estimated that the maximum intrinsic population growth rate (r_max) of devil rays is similar to manta rays, and these productivity rates are among the lowest of all chondrichthyans (Dulvy et al. 2014, Pardo et al. 2016). Mating, parturition, and early life history are reported to take place in the shallow water during summer and perhaps early autumn (Notarbartolo di Sciara 1988).For the Spinetail Devil Ray (up to 310 cm DW), Cuevas-Zimbrón (2012) estimated age at maturity to be 5-“6 years and a minimum lifespan of 14 years, giving a generation length of 10 years. While accurate age at maturity and longevity information is unavailable for the Bentfin Devil Ray, it can be inferred according to the smaller maximum size that it would be close to but slightly shorter than that of its congener. As there are not enough data to estimate an exact generation length for this species, an approximate, suspected generation length is used. A midway point of 7.5 years between a very conservative low of five years, and the larger Spinetail Devil Ray's 10-year generation length is suspected to be the approximate generation length for the Bentfin Devil Ray until more accurate information becomes available.