▁in ▁fresh water ▁habit ats , ▁where ▁they ▁can ▁surv ive , ▁and ▁there ▁have ▁been ▁reports ▁of ▁individuals ▁in ▁New ▁Ham pshire ▁p onds , ▁as ▁well ▁as ▁the ▁upper ▁Ohio ▁River ▁and ▁Be aver ▁River . ▁ ▁The ▁m umm ich og ▁is ▁a ▁common ▁fish ▁in ▁coast al ▁habit ats ▁such ▁as ▁salt ▁mar sh es , ▁mud dy ▁cre eks , ▁tid al ▁channels , ▁bra ck ish ▁est u aries , ▁e el gr ass ▁or ▁cord gr ass ▁b eds , ▁and ▁shelter ed ▁sh or elines . ▁It ▁can ▁be ▁found ▁within ▁coast al ▁rivers ▁but ▁s eld om ▁beyond ▁the ▁head ▁of ▁t ide . ▁A ▁few ▁land locked ▁populations ▁may ▁exist ▁in ▁fresh water ▁la kes ▁close ▁to ▁shore , ▁for ▁example ▁on ▁Dig by ▁Ne ck , ▁Nova ▁Scot ia . ▁ ▁Diet ▁ ▁M umm ich ogs ▁are ▁om n iv orous . ▁Anal ys es ▁of ▁their ▁st om ach ▁contents ▁have ▁found ▁di at oms , ▁am ph ip ods ▁and ▁other ▁cr ust ace ans , ▁m oll us cs , ▁fish ▁eggs ▁( including ▁their ▁own ▁species ), ▁very ▁small ▁fish , ▁insect ▁lar va e , ▁and ▁bits ▁of ▁e el gr ass . ▁ ▁Phys i ology ▁This ▁fish ▁is ▁well ▁known ▁for ▁its ▁ability ▁to ▁with stand ▁a ▁variety ▁of ▁environmental ▁conditions . ▁They ▁can ▁surv ive ▁temper atures ▁between ▁; ▁even ▁within ▁the ▁same ▁tid al ▁cycle ▁they ▁can ▁toler ate ▁rapid ▁temperature ▁changes