1 / 19

What to feed yellowtail kingfish cultured in cold water?

What to feed yellowtail kingfish cultured in cold water?. JENNA BOWYER PhD Supervisors A/Prof. Jian Qin Flinders University Dr. David Stone SARDI Aquatic Sciences (SUSTAINABLE FEEDS & FEED MANAGEMENT FOR YELLOWTAIL KINGFISH). Introduction. Y ellowtail kingfish, Seriola lalandi (YTK).

petrick
Download Presentation

What to feed yellowtail kingfish cultured in cold water?

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. What to feed yellowtail kingfish cultured in cold water? JENNA BOWYER PhD Supervisors A/Prof. Jian Qin Flinders University Dr. David Stone SARDI Aquatic Sciences (SUSTAINABLE FEEDS & FEED MANAGEMENT FOR YELLOWTAIL KINGFISH)

  2. Introduction Yellowtail kingfish, Seriola lalandi (YTK) Clean Seas Tuna (CST) currently produces 5000 Mt yr-1

  3. CST YTK aquaculture sites in SA Port Augusta Arno Bay SPENCER GULF Port Lincoln CST plan to boost production to 10,000 Mt yr-1

  4. YTK are grown at fluctuating water temps in Spencer Gulf (11-24°C) Water temp (°C)

  5. Production cycle of YTK grown at fluctuating water temps in Spencer Gulf (11-24°C) stocking harvest Water temp (°C) Harvest at 3 - 4kg (1 winter) Stock fish at 5 g (Oct/Nov) Miss harvest window = loss of productivity 15-18 month production cycle

  6. Effects of water temperature on growth YTK are grown at fluctuating water temps in Spencer Gulf (11-24°C) Best growth Moderate growth (Shoulder periods) Water temp (°C) Low or no growth

  7. To improve the condition coming into winter (sub-optimal temperatures, 17-19°C) in an attempt to get better growth coming out of winter to meet harvest schedule Aim Shoulder period Shoulder period Water temp (°C) Need better understanding of the nutritional requirements of YTK cultured at 17-19°C

  8. Objectives • Explore baseline growth performance, condition and feed efficiencies for YTK cultured at different water temperatures ranging from 12 to 24°C • Determine effective protein: energy ratios for YTK at optimal (24°C) & sub-optimal temperatures (18°C) • Replace fish meal & fish oil with sustainable alternative plant & animal protein & lipid sources at optimal (24°C) & sub-optimal temperatures (18°C)

  9. Experimental facilities • South Australian Research & Development Institute – Aquatic Sciences • Temperature controlled recirculating & flow-through systems • Nutrition laboratory • 24 × 700-L fibreglass tanks • Aquarium room • 36 × 170-L fibreglass tanks

  10. Experimental facilities • Department of Primary Industries, NSW Port Stephens Fisheries Institute • Temperature controlled recirculating & flow through systems Source: Dr. Mark Booth, PSFI, NSW

  11. Experiments

  12. Experiment 1: Growth performance, condition & feed efficiencies of YTK at 12 to 24°C Aim: Benchmark growth performance of YTK • Location: NSW DPI, Port Stephens Fisheries Institute (PSFI) • Diet : Reference diet (45% protein, 20% lipid) • Fish size: ~500g YTK • Replication: 3 tanks/treatment • Duration: 8 weeks

  13. Experiment 2a & 2b: Optimum protein: energy ratios for small & large YTK at 18 & 24°C Aim: Determine optimum P:E ratios for YTK • Experiment 2b • ~250g (initial) YTK • 2 tanks/ treatment • 8 weeks • Experiment 2a • ~5g (initial) YTK • 3 tanks/ treatment • 4 weeks • Location: SARDI Aquatic Sciences, West Beach SA • Diets: formulated using fish meal & fish oil as the primary ingredients

  14. Experiments 3 & 4: Evaluation of alternative protein sources at 18°C & 24°C Aim: Investigate the suitability of sustainable alternative protein sources to replace fish meal for YTK • Location: SARDI Aquatic Sciences, West Beach SA • Test products: soybean, canola, lupin & poultry (TBD) • Diets: 5 diets to be formulated to contain equal amounts of protein, lipid & energy (TBD) & balanced for lysine & methionine • Fish size: ~5g (initial) • Replication: 3 tanks/treatment • Duration: 4 weeks

  15. Experiments 5: Alternative lipid sources (canola oil, poultry fat) at 18°C & 24°C Aim: Investigate the growth performance of YTK when fed sustainable alternative lipid sources to replace fish oil • Location: SARDI Aquatic Sciences, West Beach SA • Test products: canola oil & poultry fat (TBD) • Diets: test products to replace fish oil in dietary formulation • Fish size: small fish ~5g • Replication: 3 tanks/treatment • Duration: 4 weeks

  16. Sample analysis • Growth performance/ condition/ feed efficiency • Specific growth rate (%BW/ day), daily feed intake, feed conversion ratio, condition index, protein & energy retention efficiencies, fillet yield, hepatosomatic index • Apparent digestibility coefficient (ADC) • Run after completion of growth trial • Faeces will be collected by manual stripping • Proximate composition of faeces and diets • Fillet fatty acid composition • product quality • Proximate composition • Nutrient retention efficiencies & product quality • Lipid oxidation (liver) • Thiobarbituric acid reactive substances (TBARS) • Vitamin E

  17. Rainbow trout, (Oncorhynchus mykiss) digestive tract Sample analysis • Gut bacterial flora • Identify the bacterial communities in the anterior & posterior gut sections, using Terminal Restriction Fragment Length Polymorphism (TRFLP) • Histology • Identify any physical changes in sections of the anterior & posterior digestive tract • Enzyme analysis • Determine the enzymatic activity of pepsin, trypsin, chymotrypsin, lipase & amylase from sections of the digestive tract • Plasma • Cholesterol • Triacylglycerides Normal villi of large intestine, longitudinal section of outer muscular layer, a thin pink-staining stratum compactum & villi.  Villi are long, have space between them. Apical vacuoles seen in mucosal epithelium.  Fusion of intestinal villi.  Villi are somewhat shortened adjacent to the fused ones.

  18. Outcomes • Directly benefit YTK industry in Australia • By providing information to develop sustainable, cost effective dietary formulations, i.e. • Identification of optimum P:E ratios • Replacement of fish meal & fish oil with more sustainable plant & terrestrial sources to reduce ingredient costs • Leading to enhanced sustainable productivity of YTK cultured at sub-optimal water temperatures

  19. “ This work formed part of a project of the Australian Seafood Cooperative Research Centre, and received funds from the Australian Government’s CRCs Programme, the Fisheries R&D Corporation and other CRC Participants”. Acknowledgements • Australian Seafood CRC • Clean Seas Tuna Ltd. • Mr. Mike Thomson • Mr. Chester Wilkes • Flinders University • Dr. Kathy Schuller • SARDI-Aquatic Sciences • Dr Valeria Torok • Department of Primary Industries Port Stephens • Dr. Mark Booth • University of Tasmania • Dr. Louise Ward

More Related