Please use this identifier to cite or link to this item: http://hdl.handle.net/1893/19630
Appears in Collections:Aquaculture Journal Articles
Peer Review Status: Refereed
Title: Exposure of Larvae to Daily Thermocycles Affects Gonad Development, Sex Ratio, and Sexual Steroids in Solea senegalensis, Kaup
Authors: Blanco-Vives, Borja
Vera, LM
Ramos, Jesus
Bayarri, Maria Jose
Mananos, Evaristo
Sanchez-Vazquez, F Javier
Contact Email: luisa.veraandujar@stir.ac.uk
Issue Date: 1-Mar-2011
Publisher: Wiley-Blackwell
Citation: Blanco-Vives B, Vera L, Ramos J, Bayarri MJ, Mananos E & Sanchez-Vazquez FJ (2011) Exposure of Larvae to Daily Thermocycles Affects Gonad Development, Sex Ratio, and Sexual Steroids in Solea senegalensis, Kaup, Journal of Experimental Zoology Part A: Ecological Genetics and Physiology, 315A (3), pp. 162-169.
Abstract: The effect of water temperature during the development of fish larvae on sex differentiation is well known, but not so well known is the impact of the daily thermocycles. Our aim was to investigate the effect of early exposure of Senegal sole larvae to different temperature cycles on gonad development, sex ratio, and sex steroid (11-ketotestosterone (11-KT); estradiol (E2); and testosterone, (T)) content in muscle extracts of juveniles. From 1 to 97 days posthatching (DPH) fish larvae and post-larvae were subjected to three temperature regimes: Thermophase-Cryophase (TC), Cryophase-Thermophase (CT), and constant temperature. In fish exposed to TC, sex determination occurred earlier, because 90% of soles were males/females at 110 DPH, whereas 45% of fish under CT were undifferentiated at that time. Fish under TC showed the highest growth rates, followed by fish under constant temperature and by fish under CT, the differences being statistically significant between the TC and CT groups. Regarding sex ratio, juveniles exposed to TC showed a higher proportion of females than fish under CT or constant temperature. Under TC, fish showed the highest concentration of E2, whereas 11-KT concentration was highest in fish under CT and constant temperature. Fish under constant temperature and CT showed higher T levels than those under TC. These results provide the first insights into the effect of daily thermocycles on sex differentiation in fish, and underline the key role of natural environmental cycles on the control of sex ratios during larval development, which may be applied to the manipulation of sex ratio in aquaculture.
Type: Journal Article
URI: http://hdl.handle.net/1893/19630
DOI Link: http://dx.doi.org/10.1002/jez.664
Rights: The publisher does not allow this work to be made publicly available in this Repository. Please use the Request a Copy feature at the foot of the Repository record to request a copy directly from the author. You can only request a copy if you wish to use this work for your own research or private study.
Affiliation: University of Murcia
Aquaculture
Spanish Council for Scientific Research
Spanish National Research Council (CSIC)
Spanish Council for Scientific Research
University of Murcia

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