The life cycle of Cardicola forsteri (Trematoda: Aporocotylidae), a pathogen of ranched southern bluefin tuna, Thunnus maccoyi

► Aporocotylid blood flukes are emerging as one of the most significant pathogens of finfish culture. ► Terebellid polychaetes are a major host group for aporocotylids. ► This work is only the second elucidated marine aporocotylid life-cycle. ► The first to utilise molecular matching of intermediate and adult stages. ► Implications for control.