Abstract
This chapter describes diseases in ranched and farmed bluefin tunas. Blood fluke infection, caused by three different species from genus Cardicola is the main problem in ranching in Australia and farming in Japan. These infections have been managed using praziquantel applied as oral treatment. Swimmer syndrome caused by a scuticociliate Uronema nigricans caused mortalities in southern bluefin tuna (SBFT) but does no longer appear to be an issue. Photobacterium damsela subsp. piscicida caused mortalities in ranched Atlantic bluefin tuna (ABFT) in 2003 and 2004. Closing life cycles for SBFT and ABFT will result in more health issues as naïve fish from hatcheries will be transferred to marine cages, as has been witnessed for hatchery-reared Pacific bluefin tuna (PBFT) in Japan. Intensification of ranching and global challenges may contribute to other health problems. While there are some species-specific and regional differences there are many common issues suggesting effectiveness of international research collaborations.
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