Kalmar "brown bullhead" yawanci tana nufin wani nau'in kifi na ruwa mai tsabta wanda ke cikin dangin catfish. A cikin ƙamus, "brown bullhead" za a bayyana shi azaman kifi na Arewacin Amirka (Ameiurus nebulosus) wanda yawanci launin ruwan kasa ne kuma yana da kai mai laushi, ƙananan idanu, da wutsiya mai yatsa. Fitaccen kifin wasa ne kuma ana iya samun shi a cikin tafkuna, tafkuna, da rafuka a cikin yawancin Arewacin Amurka.