ube ▁to ▁the ▁top ▁of ▁a ▁tower ▁sil o . ▁ ▁Ana er ob ic ▁dig estion ▁ ▁Sil age ▁may ▁be ▁used ▁for ▁an a er ob ic ▁dig estion . ▁ ▁Fish ▁sil age ▁ ▁Fish ▁sil age ▁is ▁a ▁method ▁used ▁for ▁conser ving ▁by - products ▁from ▁fish ing ▁for ▁later ▁use ▁as ▁feed ▁in ▁fish ▁far ming . ▁This ▁way , ▁the ▁parts ▁of ▁the ▁fish ▁that ▁are ▁not ▁used ▁as ▁human ▁food ▁such ▁as ▁fish ▁g uts / ent rails , ▁fish ▁heads ▁and ▁tr imm ings ▁are ▁instead ▁util ized ▁as ▁ing red ients ▁in ▁feed ▁pel lets . ▁The ▁sil age ▁is ▁performed ▁by ▁first ▁gr inding ▁the ▁remains ▁and ▁mixing ▁it ▁with ▁form ic ▁acid , ▁and ▁then ▁storing ▁it ▁in ▁a ▁tank . ▁The ▁acid ▁helps ▁with ▁pres ervation ▁as ▁well ▁as ▁further ▁dissol ving ▁the ▁resid ues . ▁Process ▁plants ▁for ▁fish ▁sil age ▁can ▁either ▁come ▁in ▁the ▁form ▁of ▁t anks ▁on board ▁ships ▁or ▁at ▁land . ▁During ▁fish ▁sil age , ▁workers ▁should ▁take ▁ca ution ▁to ▁minim ize ▁the ▁d angers ▁of ▁health , ▁fire ▁or ▁explos ion ▁due ▁to ▁the ▁use ▁of ▁form ic ▁acid . ▁ ▁See ▁also ▁Ar tt uri ▁Il m ari ▁V irt an en ▁Gra in ▁cr imp ing ▁My co estro gen ▁Tr if ol ium ▁pr at ense ▁X eno estro gen ▁ ▁Foot notes ▁ ▁References ▁ ▁M aking ▁and ▁Fe eding ▁Sil age , ▁John ▁Mur do