The John dory is a carnivore, feeding primarily on fishes, crustaceans, and cephalopods. Prey species selection is influenced by the availability and accessibility of prey. The dominant species in the diet is likely to be the most abundant prey in the habitat. In the North Atlantic, juveniles, 3—10 in (8—25 cm), feed mainly on benthic fishes, for example, dragonets (family Callionymi-dae) and Norway pout (family Gadidae). Adults, 10—22 in
(25—56 cm), switch to a diet of larger schooling fishes, primarily blue whiting, Micromesistius poutassou (Risso, 1826), and snipefish, Macroramphosus scolopax (Linnaeus, 1758), of the family Macroramphosidae. Adults have few predators, except for great white sharks and goosefishes (Lophius spp.). Juveniles are probably eaten by piscivorous predators.
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A time for giving and receiving, getting closer with the ones we love and marking the end of another year and all the eating also. We eat because the food is yummy and plentiful but we don't usually count calories at this time of year. This book will help you do just this.