Danish North SeaArticle: Reduction of harbour porpoise (Phocoena phocoena) bycatch by iron-oxide gillnetsTarget catch: CodStudy Type: Field study in the wildEffect on target catch: Reduced by 30%Effect on bycatch species: Reduced harbour porpoise bycatchBycatch species: Phocoena phocoena (Harbor porpoise)Fishing Gear: GillnetsReduction technique: Metal oxide/barium sulfate nets