▁in ▁the ▁world , ▁this ▁local ▁solution ▁could ▁not ▁scale ▁to ▁the ▁current ▁rate ▁of ▁consumption . ▁ ▁Animal ▁f ats ▁are ▁a ▁by - product ▁of ▁meat ▁production ▁and ▁cook ing . ▁Although ▁it ▁would ▁not ▁be ▁efficient ▁to ▁raise ▁animals ▁( or ▁catch ▁fish ) ▁simply ▁for ▁their ▁fat , ▁use ▁of ▁the ▁by - product ▁adds ▁value ▁to ▁the ▁liv est ock ▁industry ▁( h ogs , ▁cattle , ▁p oul try ). ▁Today , ▁multi - feed stock ▁b iod ies el ▁facilities ▁are ▁producing ▁high ▁quality ▁animal - f at ▁based ▁b iod ies el . ▁Currently , ▁a ▁ 5 - mill ion ▁doll ar ▁plant ▁is ▁being ▁built ▁in ▁the ▁US , ▁with ▁the ▁intent ▁of ▁producing ▁ 1 1 . 4   mill ion ▁lit res ▁( 3   mill ion ▁gall ons ) ▁b iod ies el ▁from ▁some ▁of ▁the ▁estimated ▁ 1   b ill ion ▁kg ▁( 2 . 2   b ill ion ▁pounds ) ▁of ▁ch icken ▁fat ▁produced ▁ann ually ▁at ▁the ▁local ▁T ys on ▁p oul try ▁plant . ▁Similarly , ▁some ▁small - scale ▁b iod ies el ▁fact ories ▁use ▁waste ▁fish ▁oil ▁as ▁feed stock . ▁ ▁An ▁EU - fund ed ▁project ▁( EN ER F IS H ) ▁suggests ▁that ▁at ▁a ▁Vietnam ese ▁plant ▁to ▁produce ▁b iod ies el ▁from ▁cat fish ▁( bas a , ▁also ▁known ▁as ▁p ang as ius ), ▁an ▁output ▁of ▁ 1