 Experiments have shown that the shark's capacity for osmoregulation is dependent on how well it has fed.The pyjama shark feeds on a wide variety of small animals, including bony fishes such as anchovies, gurnards, and hakes, hagfishes, smaller sharks and rays and their egg cases, crustaceans, cephalopods, bivalves, and polychaete worms; it has also been known to scavenge on fish offal.Although it has a predilection for cephalopods, the dietary composition of this opportunistic predator generally reflects the locally available prey types.