A picture taken on March 9, 2021 shows a starfish tentacle at the Marine Station in Concarneau, western France. - They both fascinate and worry: starfish, fond of mussels, oysters and other shellfish, are often considered an invasive species. In order to reduce their impact, Breton researchers are looking, not without difficulty, on their valuation. (Photo by Fred TANNEAU / AFP) (Photo by FRED TANNEAU/AFP via Getty Images)
