Image located at

Portuguese Men of War feed on a wide variety of soft bodied prey, including fish, fish larvae, cephalopods, and eel larvae. They are prevented from capturing hard bodied organisms due to the structure of their nematocysts.  Like wise, larger fish, such as flying fish and mackerel, usually manages to escape the tentacles.

Once a prey item is caught, the tentacles contract and bring the prey into contact with the multiple digestive polyps or gastrozooids located on the underside of the pneumatophore. These bag-like stomachs, each complete with individual mouths, digest the prey via enzymes secreted to breakdown proteins, carbohydrates, and fats and eventually liquify the organism.

Following digestion, any indigestible remains are expelled though the mouths of the gastrozooids. The nourishment provided by the digested food is then absorbed into the body and is eventually circulated to the different polyps in the colony.