▁ ▁and ▁its ▁typical ▁habitat ▁is ▁over ▁sand y ▁or ▁mud dy ▁se ab eds , ▁often ▁in ▁se agr ass ▁me adows . ▁ ▁Be hav iour ▁Amer ic am ysis ▁b ah ia ▁is ▁found ▁on ▁or ▁just ▁above ▁the ▁se ab ed , ▁t ending ▁to ▁be ▁concentr ated ▁in ▁slight ▁de press ions ▁and ▁facing ▁towards ▁the ▁current . ▁At ▁night ▁it ▁makes ▁vertical ▁migr ations ▁to ▁feed ▁at ▁the ▁surface . ▁O pos sum ▁sh rim ps ▁are ▁om n iv ores ▁and ▁although ▁the ▁di et ▁of ▁Amer ic am ysis ▁b ah ia ▁in ▁the ▁wild ▁has ▁not ▁been ▁studied , ▁exam ination ▁of ▁the ▁st om ach ▁contents ▁of ▁the ▁closely ▁related ▁Amer ic am ysis ▁al my ra ▁showed ▁ 3 1 % ▁v asc ular ▁plant ▁de br is ▁and ▁ 1 1 % ▁co pe pod s ▁and ▁di at oms . ▁In ▁the ▁labor atory ▁it ▁is ▁usually ▁fed ▁on ▁the ▁lar va e ▁of ▁the ▁br ine ▁sh rim p ▁Ar tem ia ▁sal ina . ▁O pos sum ▁sh rim ps ▁play ▁an ▁important ▁part ▁in ▁the ▁food ▁chain ▁and ▁are ▁consum ed ▁in ▁large ▁quantities ▁by ▁such ▁fish ▁as ▁the ▁in land ▁sil vers ide , ▁wh iffs ▁and ▁fl ound ers . ▁ ▁Life ▁cycle ▁Fem ale ▁Amer ic am ysis ▁b ah ia ▁sh rim ps ▁become ▁m ature ▁between ▁the ▁tw elf th ▁and ▁tw enti eth ▁day , ▁depending ▁on ▁di et ▁and ▁temperature