Baroiller jean francois
Cadre sup CIRAD

My current research aims to describe the genetic and epigenetic bases of two traits of interest, sex differentiation and salinity tolerance using different tilapia species. By analyzing through genomic approaches (RADseq, RNAseq), how high temperatures can induce sex reversals (TISR) and influence sex ratios, promote changes in the sex determination system and/or sex chromosomes I seek to answer the following questions:

(a) how and why genetic (GSD) and environmental factors co-exist in sex determination of the Nile tilapia at the population level;

(b) under which conditions and at what frequency the TISR can override the GSD in the natural environment;

© what are the consequences (fitness) for TISR individuals and for the population resilience.

Identification of thermosensitivity markers is also a part of my activities and a prerequisite for an environmental control of sex in tilapia.

By similar approaches, adaptation/tolerance to salinity are studied by comparing tilapia species with high (O. mossambicus or Sarotherodon melanotheron) or low (O. niloticus) euryhalinity subjected to different challenges.

Finally, I also participate in projects that aim to enhance aquatic biodiversity and limit the impact of aquaculture on the environment (integrated systems).

  • Baroiller, J.F., D’Cotta, H., 2017. Sex control in tilapias. In: Sex Control in Aquaculture (Wang, H.P., F. Piferrer & S.L. Chen Eds.). ISBN: 978-1-119-12726-0 (sous presse). Wiley-Blackwell.
  • Baroiller JF, D’Cotta H, 2016: The reversible sex of gonochoristic fish: insights and consequences. Dev., 10 (5-6): 242-266; doi: 10.1159000452362.
  • Gammerdinger WJ, Conte MA, Baroiller JF, D’Cotta H, Kocher TD, 2016. Comparative Analysis of a Sex Chromosome from the Blackchin Tilapia, Sarotherodon melanotheron. BMC Genomics. DOI: 1186/s12864-016-3163-7.
  • Ahmadi, N., Baroiller, J.F., D’Cotta, H., Morillon, R., 2016. Adaptation to Salinity, in “Climate Change and Agriculture Worldwide”, Chapter 4. E. Torquebiau, ed., Publisher Springer Netherlands, Éditions Quæ pp. 45-58. DOI: 1007978-94-017-7462-8_4.
  • Brawand D, et al., 2014. The genomic substrate for adaptive radiation: genomes of five African cichlid fish. Nature, 513: 375–381. DOI : 1038/nature13726
  • Link K, Berishvili G, Shved N, D’Cotta H, Baroiller JF, Eppler E, Reinecke M, 2010. Seawater and freshwater challenges affect the insulin-like growth factors IGF-I and IGF-II in liver and osmoregulatory organs of the tilapia. Molecular and Cellular Endocrinology, 327: 40-46. DOI: 1016/j.mce.2010.05.011
  • Baroiller JF, D’Cotta H, Bezault E, Wessels S, and Hoerstgen-Schwark G, 2009. Tilapia sex determination: Where temperature and genetics meet. Comparative Biochemistry and Physiology, Part A, 153: 30–38. DOI: 1016/j.cbpa.2008.11.018