The Shortfin Mako is an offshore littoral and epipelagic species found in tropical and warm-temperate seas to depths of up to 750 m (Compagno 2002, Weigmann 2016). This species reaches a maximum size of about 445 cm total length (TL) (Weigmann 2016). Males reach maturity at about 166-195 cm and females at about 265-280 cm (Pratt and Casey 1983, Stevens 1983, Cliff et al. 1990, Varghese et al. 2017). Age at maturity has been determined in several populations, including New Zealand (7-9 years for males, and 19-21 years for females Bishop et al. (2006)), and the NW Atlantic (eight years for males, and 18 years for females (Natanson et al. 2006)). Longevity has been estimated as 29-32 years (Bishop et al. 2006, Natanson et al. 2006). A study conducted off Brazil reported a longevity of 19-28 years and age at maturity of 7-12 years for females and longevity of 16-23 years and age at maturity of 3-6 years for males (Barreto et al. 2016b).The Shortfin Mako is ovoviviparous and oophagous, but what little is known of its reproductive cycle indicates the gestation period is 15-18 months, with a three year reproductive cycle (Mollet et al. 2002). Litter size is 4-25 pups (possibly up to 30, mostly 10-18), which are about 60-70 cm long at birth (Garrick 1967, Compagno 2001). There are comparatively few records of pregnant females. Among 26 shark species, the Shortfin Mako has an intrinsic rebound potential (a measure of its ability to recover from exploitation) in the mid-range (Smith et al. 1998) with an annual rate of population increase at 0.046 yr^-1. Cortes (2002) calculated a finite rate of increase (lambda) of 1.141 (1.098 to 1.181 95% CI, r = 0.13) and the average reproductive age as 10.1 (9.2 to 11.1 95% CI) years. Generation length is estimated at 24-25 years based on data for this species from New Zealand and the NW Atlantic (Bishop et al. 2006, Compagno et al. 2005, Natanson et al. 2006).