Also, some data collected during the surveys in the Balearic Sea and the Ionian Sea found one specimen at 800 m in the western Ionian Sea, suggesting that the population of O. centrina, in the Eastern central Mediterranean, has an unknown population.
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At the beginning of the 1960s, he was a close friend of the French painter Maurice Boitel, who painted many pictures on the Pitxot family's property in Cadaqués, a small port town on the Balearic Sea near the French border, that was also painted by Pablo Picasso and André Derain.