Health and performance of ranched southern bluefin tuna

TL;DRAbstract

The Australian southern bluefin tuna (SBT) industry is continually looking for ways to improve fish health within the ranching environment, both for increased profitability and concern for animal welfare. This thesis utilized current and newly acquired knowledge about southern bluefin tuna health to make educated manipulations of their ranching environment and/or husbandry practices. SBT health, parasites and performance where then monitored as a measurement of success. Five major projects were completed, all projects completed on the commercial scale. Three projects focused on environmental and/or husbandry manipulations: (chapter 2) dietary supplementation of immunostimulants and vitamins; (chapter 4) moving cages further offshore; (chapter 6) an assessment of two management strategies for blood fluke, Cardicola forsteri, infection. While two projects aimed to gain more information about ranched SBT health: (chapter 3) a detailed description of the first two months of ranching; (chap

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