This research was implemented to study the effects of androgenic gland ablation in the white shrimp Litopenaeus vannamei to explore sex reversal potential as an alternative technology for monosex female mariculture based on the sex dimorphic growth of this species. The surgical procedure was applied to male postlarvae (PL) at different ages, after external sex differentiation, as well as in sex undifferentiated PL. Andrectomized males regenerated normal appendices including pereiopods and pleopods; however, body growth and relative size of regenerated petasmas and appendices masculinae were statistically inferior (P ˂ 0.05) to control males. Spermatogenesis in andrectomized males was active, but a phenomenon of degradation of spermatids and reproductive tissues was detected. No sex reversal was accomplished regardless of PL age from sex undifferentiated stages (PL38) to sex differentiated stages (˃PL55). The complete regeneration of sexual characters in andrectomized L. vannamei (Dendrobranchiata) is different from previous reports from Decapoda.
.
ResumenEl pargo mancha Lutjanus guttatus es una de las especies de peces de mayor importancia comercial capturada en el Golfo de Nicoya, que desde hace muchos años ha venido sufriendo una fuerte presión pesquera, principalmente, por la flota artesanal. De abril del 2015 a abril del 2016, se analizaron 1109 especímenes, con el fin de conocer algunos aspectos biológico pesqueros de la población que se que se distribuye en el Área Marina de Pesca Responsable Paquera-Tambor en este golfo. La relación longitud total-peso total indica que esta especie posee un crecimiento alométrico negativo; tal población está conformada por cuatro cohortes. La talla media de primera madurez sexual se estimó en 30 cm de longitud total y se determinaron dos periodos máximos de reproducción: el primero de mayo a agosto y el segundo de octubre a noviembre. Los parámetros de crecimiento estimados fueron L∞ = 65 cm de longitud total, K = 0,32 anual y to = -0,42. Las tasas de mortalidad estimadas fueron M =
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.