Aggregations numbering up to a hundred have been observed off Gran Canaria in the summer. Known parasites of this species include the tapeworms Grillotia smaris-gora, G. angeli, and Christianella minuta, the fluke Pseudocotyle squatinae, the monogenean Leptocotyle minor, and the isopod Aega rosacea.
Off Gran Canaria, aggregations of up to a hundred individuals have been observed during the summer.  The species is known to be parasitized by tapeworms (Grillotia smaris-gora, G. angeli, and Christianella minuta), flukes (Pseudocotyle squatinae), monogeneans (Leptocotyle minor), and isopods (Aega rosacea).