 Over 90 % of the sicklefin lemon shark 's diet consists of <unk> 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 . Known parasites include the tapeworms Paraorygmatobothrium <unk> , <unk> <unk> , Phoreiobothrium <unk> , and Platybothrium <unk> . Sicklefin lemon sharks have been documented resting on the bottom and eliciting cleanings by bluestreak cleaner wrasses ( Labroides dimidiatus ) , during which they may open their mouths and stop respiring for as long as 150 seconds to give the wrasses access to their mouths and gills . 
