1. Advances in eel reproductive physiology and endocrinology / Karine Rousseau, Anne-Gaelle Lafont, Jeremy Pasquier, Gersende Maugars, Cecile Jolly, Marie-Emilie Sebert, Salima Aroua, Catherine Pasqualini and Sylvie Dufour -- 2. The swimbladder / Bernd Pelster -- 3. Morpho-functional design of the eel heart / Daniela Amelio, Filippo Garofalo, Sandra Imbrogno and Bruno Tota -- 4. Sex differences in energy metabolism / Philippe Sebert -- 5. Sensory systems / David M. Hunt, Nathan S. Hart and Shaun P. Collin -- 6. Intestinal absorption of salts and water / Masaaki Ando and Yoshio Takei -- 7. Endocrine control of osmoregulation / Takehiro Tsukada, Marty Kwok-Shing Wong, Maho Ogoshi and Shinya Yuge -- 8. Regulation of drinking / Shigenori Nobata and Masaaki Ando -- 9. Renal sulfate regulation / Akira Kato and Taro Watanabe -- 10. Cell volume regulation in eel intestine / Maria Giulia Lionetto, Maria Elena Giordano and Trifone Schettino -- 11. The immune system / Michael Engelbrecht Nielsen, Joanna J. Meist and Jacob Gunther Schmidt -- 12. Stress physiology / Jonathan Mark Wilson.