▁d ors al ▁and ▁anal ▁fins ▁are ▁dus ky ▁in ▁colour , ▁while ▁the ▁ca ud al ▁fin ▁is ▁dus ky ▁yellow ▁with ▁black ▁dist al ▁marg ins . ▁ ▁Distribution ▁and ▁habitat ▁The ▁imp oster ▁tre v ally ▁inhab its ▁the ▁tropical ▁waters ▁of ▁the ▁Indian ▁and ▁west ▁Pacific ▁O ce ans . ▁Its ▁range ▁extends ▁from ▁the ▁G ulf ▁of ▁O man ▁through ▁to ▁India ▁and ▁Sri ▁L anka ▁in ▁the ▁west , ▁with ▁a ▁break ▁in ▁records ▁from ▁Sri ▁L anka ▁to ▁the ▁G ulf ▁of ▁Th ailand . ▁In ▁the ▁west ▁Pacific ▁the ▁imp oster ▁tre v ally ▁inhab its ▁South ▁East ▁Asian ▁waters ▁from ▁the ▁G ulf ▁of ▁Th ailand ▁to ▁Sum atra ▁and ▁Bor neo . ▁It ▁is ▁distributed ▁east ▁towards ▁the ▁Philippines ▁and ▁Gu am , ▁and ▁south ▁to ▁Australia . ▁ ▁The ▁imp oster ▁tre v ally ▁inhab its ▁coast al ▁waters ▁throughout ▁its ▁range , ▁often ▁found ▁over ▁the ▁sand y ▁contin ental ▁sh elf ▁in ▁the ▁waters ▁off ▁North ▁West ▁Australia . ▁Here ▁it ▁is ▁known ▁to ▁form ▁coh ab it ▁with ▁Car ango ides ▁co er ule op inn atus ▁and ▁Car ango ides ▁mal ab ar icus ▁in ▁waters ▁ 3 0 ▁to ▁ 1 4 0 ▁m ▁deep . ▁ ▁Bi ology ▁and ▁fish ery ▁Only ▁one ▁study ▁has ▁thoroughly ▁recorded ▁the ▁di et ▁of ▁the ▁imp oster ▁tre v ally , ▁which ▁was ▁carried ▁out ▁in ▁Al bat ross ▁Bay , ▁Australia . ▁It ▁was ▁found ▁tele ost ▁fish