“…Both liquid injections and controlled-release delivery systems (implants) that release GnRHa for a prolonged period of time have been shown to be effective in inducing maturation in females (Duncan et al, 2012(Duncan et al, , 2013Fernández-Palacios et al, 2014;Mylonas et al, 2013a). In the case of a single injection of GnRHa, lower total fecundity was obtained due to the fact that a GnRHa injection induced only 2-3 spawns (Duncan et al, 2012(Duncan et al, , 2013Fernández-Palacios et al, 2014), while the species has the capacity for multiple spawns (Gil et al, 2013;Mylonas et al, 2013b). On the other hand, GnRHa implants produce multiple daily spawns (Mylonas et al, 2013a), as described in various other fishes with a protracted spawning season and asynchronous or group synchronous ovarian development, which undergo many cycles of oocyte maturation in the course of many weeks (Guzmán et al, 2009;Kokokiris et al, 2005;Larsson et al, 1997;Zohar et al, 1995).…”