Many data are provided in guide books, scientific papers, web sites. I used more particularly the following ones.
Some useful guide books (in French)
Augier Henry, 2007. Guide des fonds marins de Méditerranée. Les guides du naturaliste. Delachaux et Niestlé, 456p.
Simeonidis, Noelle & Dinos. La vie dans les mers grecques et la Méditerranée. Mediterraneo Editions, 245p. ISBN : 978-960-6848-26-1.
Weinberg Steven, 1998. La Méditerranée. Nathan Nature, 351p. ISBN 2.09.260663.8
Interesting websites (in French)
https://doris.ffessm.fr
https://www.fishipedia.fr/fr/poissons/native_regions/mer-mediterranee
Jellyfish – additional references
İsinibilir, M. Yuksel, E., & Dalyan, C. (2021). First record of Cotylorhiza tuberculata (Macri, 1778) from the sea of Marmara. Aquatic and Engineering, 36(1), 38-41.
Kikinger, R. (1992). Cotylorhiza tuberculata (Cnidaria: Scyphozoa) – Life History of a Stationary Population. Mar. Ecol. 13 (4), p.333 – 362.
Lilley, Martin K. S., Martina Ferraris, Amanda Elineau, Léo Berline, Perrine Cuvilliers, Laurent, Gilletta, Alain Thiéry, Gabriel Gorsky, and Fabien Lombard. 2014. “Culture and Growth of the Jellyfish Pelagia noctiluca in the Laboratory.” Marine Ecology Progress Series 510: 265–73
Prieto L, Astorga D, Navarro G, Ruiz J (2010) Environmental Control of Phase Transition and Polyp Survival of a Massive-Outbreaker Jellyfish. PLoSONE 5(11): e13793. doi:10.1371/journal.pone.0013793