 Over 90% of the sicklefin lemon shark's diet consists of bottom- and shore-dwelling teleosts, including herring, mullets, mackerel, silversides, needlefish, smelt-whitings, porgies, sea catfish, triggerfish, parrotfish, and porcupinefish.Occasionally, they may also take cephalopods and crustaceans, and older individuals have been known to consume stingrays and guitarfish.This species may be preyed upon by larger sharks.