Determination of quarantine period in African catfish (Clarias gariepinus) fed with pig (Sus sp.) offal to assure compliance with halal standards

► The period of quarantine period for catfish fed with pig offal for halal markets was determined. ► The absence of pig DNA in the gastrointestinal tract was used as a marker. ► Maximum istihālah (transformation) time was 36 h (stomach), 6 h (midgut) and >2 h (hindgut). ► In many cases shorter periods of istihālah were observed. ► The minimum quarantine period for catfish fed with fresh pig offal is 1.5 days.