Delphine Thibault MIO Mediterranean Institute of Oceanography spoke (from 38'10") about jellyfish and gelatinous bodies on Le club de la Terre au carré France Inter.
Every year, holidaymakers on beaches and in lagoons are stung by jellyfish. Jellyfish strandings also occur along our coastlines and are regularly reported in the press. These strandings are studied by scientists. Jellyfish sometimes indicate highly polluted areas where the ecosystem has been particularly disturbed. But who are these gelatinous animals, so elegant in the water, and how do they end up stranded on our coasts? What role do they play in the environment?
Jellyfish are 95 % water, they have no brain and a simple neuron system, but they have some of the fastest growth rates in the terrestrial and marine animal world combined. They are able to survive temperature variations of well over ten degrees and significant variations in salinity. They also survive in places with very low oxygen levels.