Identificación de un periodo fotosensible a la luz continua para reducir la precocidad en machos juveniles de lubina (Dicentrarchus labrax)

Abstract

The objective of this study was to identify a photolabile period (PP) to continuous light (LL) exposure by analyzing the levels of 11-ketotestosterone (11-KT), the rates of testicular maturation and spermiation in juveniles male sea bass. Two trials (T1, T2) were organized: T1; LL all year round (G1LL); LL during August-September (G2LL), LL September-October (G3LL), LL October-November (G4LL), in otherwise simulated natural photoperiod (SNP), respectively and SNP all the time (G5SNP). G2LL was the most efficient treatment to reduce early puberty. Thus, the period August-September was re-screened to refine the location of the PP and six treatments were organized in T2: LL all the time (G1LL); LL during August-September (G2AS), LL during August (G3AA); LL from 15August to 15September (G415AS), LL during September (G5SS) in otherwise SNP, respectively and SNP all year round (G6SNP). Our results demonstrate that the G5SS (September) was the most effective treatment to reduce the levels of 11-KT, the rates of advanced stages of maturation and the rates of spermiating males and consequently early puberty in male sea bass.