Cobia Aquaculture Under Queensland Conditions
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Cobia aquaculture under Queensland conditions A project within the Queensland Aquaculture Development Initiative 2007–2009 This publication was edited by Paul J Palmer of Agri-Science Queensland, Department of Agriculture and Fisheries. Contributors Trevor Borchert Michael Burke Luke Dutney Steven Nicholson Paul J Palmer Sizhong Wang Daniel J Willett Front cover Top left – Capture vessel Top right – Road transporter 2nd top left – Newly captured wild broodstock 2nd top middle – Gonad biopsies being taken 2nd top right – Larviculture harvest 3rd top left – Hatched larvae 3rd top right – Fry being weaned Bottom left – Juveniles resting on the bottom Bottom right – Raceway harvest of juveniles at industry facility © State of Queensland, 2020 The Queensland Government supports and encourages the dissemination and exchange of its information. The copyright in this publication is licensed under a Creative Commons Attribution 4.0 International (CC BY 4.0) licence. 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Table of contents Foreword .................................................................................................................................................. 8 Executive summary and overview ........................................................................................................... 8 Background ............................................................................................................................................ 8 The primary RD&E plan ......................................................................................................................... 9 Objectives ................................................................................................................................................ 9 Broodstock collection and maintenance ................................................................................................ 9 Induced spawning, egg incubation and hatching .................................................................................. 9 Refinements of larviculture support systems ....................................................................................... 10 Rearing larvae through to metamorphosis .......................................................................................... 10 Producing fingerlings for grow-out trials .............................................................................................. 10 Preliminary assessments of health and growth under tank and pond conditions ............................... 10 Summary of results ................................................................................................................................ 11 Broodstock collection and maintenance .............................................................................................. 11 Induced spawning, egg incubation and hatching ................................................................................ 11 Refining larviculture support systems .................................................................................................. 11 Rearing of larvae through to metamorphosis ...................................................................................... 11 Producing fingerlings for grow-out trials .............................................................................................. 12 Preliminary assessments of health and growth under tank and pond conditions ............................... 12 1. The capture and management of broodstock cobia from Moreton Bay........................................ 13 Abstract ................................................................................................................................................ 13 Introduction .......................................................................................................................................... 13 Materials and methods ........................................................................................................................ 14 Broodstock collection ......................................................................................................................... 14 Broodstock culture system and maintenance .................................................................................... 15 Results ................................................................................................................................................. 17 Broodstock collection ......................................................................................................................... 17 Broodstock growth ............................................................................................................................. 17 Broodstock health .............................................................................................................................. 18 Discussion ........................................................................................................................................... 19 References .......................................................................................................................................... 20 Appendix 1 ........................................................................................................................................... 22 Broodstock vitamin supplement......................................................................................................... 22 2. Maturation, hormone induction and spawning of cobia ................................................................ 24 Abstract ................................................................................................................................................ 24 Introduction .......................................................................................................................................... 24 Materials and methods ........................................................................................................................ 25 Gonad development .......................................................................................................................... 25 Cobia aquaculture under Queensland conditions, Department of Agriculture and Fisheries 3 Hormone induction ............................................................................................................................ 25 Egg collection .................................................................................................................................... 27 Results ................................................................................................................................................. 28 Gonadal development in 2007/08 ..................................................................................................... 28 Gonad development in 2008/09 ........................................................................................................ 29 Sperm development in 2008/09......................................................................................................... 30 Hormone induction and spawning ..................................................................................................... 30 Discussion ........................................................................................................................................... 31 References .......................................................................................................................................... 33 Appendix 2. .......................................................................................................................................... 34 Broodstock inductions 2009 .............................................................................................................. 34 3. Live food culture management at the Bribie Island Research Centre .......................................... 36 Abstract ................................................................................................................................................ 36 Introduction .......................................................................................................................................... 36 Materials and methods ........................................................................................................................ 37 Laboratory-scale microalgal cultures and media ............................................................................... 37 Outdoor intermediate and mass microalgal cultures ......................................................................... 40 Mass microalgal culture investigations .............................................................................................