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Effects of long-term feeding at maintenance ration on the onset of puberty of male sea bass (Dicentrarchus labrax L.): Special emphasis on seasonal plasma levels of IGF-I and leptin

AuthorsEscobar, Sebastián ; Felip, Alicia ; Ballester-Lozano, Gabriel F. ; Johansson, Marcus; Pérez-Sánchez, Jaume ; Thrandur Björnsson, Björn; Zanuy, Silvia ; Carrillo, Manuel
Issue Date25-Aug-2014
Citation27th Conference of European Comparative Endocrinologists (2014)
AbstractThe study investigates the effects of long-term (14 months) feeding restriction, during the second year of life of prepubertal male sea bass, on the first reproduction cycle and the relationships between nutritional status and plasma IGF-I and leptin levels. The experiment was done in triplicate and consisted of two groups: control fish (CT) fed until visual satiety and experimental fish (EX) which received food near to maintenance ration (0.35% body weight). EX fish had lower growth and muscle lipid content than CT, as well as lower gonadosomatic indeces, low rates of spermiation and a delay in its accomplishment. Nevertheless, all experimental fish achieved full maturation. EX exhibited a moderate delay of testicular maturation compared with CT, likely related to the smaller number of proliferating spermatogonial cells and larger proportion of apoptotic bodies found in this group. Plasma leptin levels of both groups appear correlated to the amount of fat stored. In EX fish, plasma IGF-I levels decreased during the experimental period. Although no correlation was observed between plasma IGF-I and leptin levels, current data suggest that in male sea bass IGF-I has a crucial role through pregametogenesis and post-gametogenesis notably during cell proliferation, while leptin could act as a permissive signal so that puberty occurs in due time.
DescriptionTrabajo presentado en la 27th Conference of European Comparative Endocrinologists, celebrada en Rennes (Francia), del 25 al 29 de agosto de 2014
Appears in Collections:(IATS) Comunicaciones congresos
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