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Abstract

This paper investigates the impact of different thermo- and photo-cycles of distinct wavelengths on Solea senegalensis larvae from day 1 to 30 post-hatching. In experiment 1, larvae were exposed to 12h light:12h dark (12L:12D) cycle and (A) constant temperature (20.7°C), (B) thermocycle of 12h thermophase: 12h cryophase, 22.1°C day: 19.0°C night (referred to as TC) or (C) 12h cryophase: 12h thermophase, 19.2°C day: 22.0°C night (referred to as CT). In experiment 2, larvae were kept under constant temperature (20.8°C) and exposed to (A) continuous light (LL), (B) continuous darkness (DD), and LD 12L:12D cycles of (C) white light (LDW), (D) blue light (LDB) or (E) red light (LDR). The sole larvae achieved the best performance, and showed fastest development and lowest degree of deformity under natural thermocycle conditions (TC) with a deformity percentage of 31.1% and LDB cycles with 27.7% of malformation, conditions which were nearest their natural aquatic environment. Larvae reared under TC started eye migration at 9day post-hatching (DPH), while larvae exposed to CT started eye migration at 11 DPH. In larvae under the LDB treatment the migration of the eye started earlier than in the other treatments (9 DPH), while larvae reared under LL and DD photoperiods died before metamorphosis. These findings highlight the importance of light and temperature cycles during the early development of S. senegalensis larvae, which should be taken into consideration in experimental or rearing protocols. © 2010 Elsevier B.V.

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Blanco-Vives, B., Villamizar, N., Ramos, J., Bayarri, M. J., Chereguini, O., & Sánchez-Vázquez, F. J. (2010). Effect of daily thermo- and photo-cycles of different light spectrum on the development of Senegal sole (Solea senegalensis) larvae. Aquaculture, 306(1–4), 137–145. https://doi.org/10.1016/j.aquaculture.2010.05.034

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