THE ROLE OF RENDERED PRODUCTS IN AQUACULTURE FEEDS Dr. Jesse Trushenski
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1 THE ROLE OF RENDERED PRODUCTS IN AQUACULTURE FEEDS Dr. Jesse Trushenski Center for Fisheries Aquaculture & Aquatic Sciences Southern Illinois University Carbondale Carbondale, Illinois USA
2 THE SEAFOOD GAP DILEMMA About 50% of our food-fish supply comes from ocean capture fisheries According to the FAO, only 20% of fish stocks are currently underutilized the remaining 80% are fully exploited or in decline Although seafood only comprises 10% of animal protein intake in North America, in other regions it represents 50% or more
3 Aquaculture production has continually outstripped projections, and there is little reason to believe that it will not continue to do so. World Bank 2006 UNEP 2009
4 INCREASING GLOBAL RELIANCE ON COMPLETE FEEDS Total Aquafeed Production (MMT) Aquaculture Production Using Compound Feeds (%) Tacon and Metian 2008
5 MATURE AQUACULTURE INDUSTRIES Trout Worldwide Sea Bream Europe Sea Bass Europe Tilapias Worldwide Catfish USA Carps Asia Milkfish Southeast Asia Salmon Worldwide Eel Japan
6 Nutritional Demands Regardless of nutritional guild, fish have high protein and lipid demands Omnivores Carnivores
7 Fish have high protein demands Species Dietary Protein (%) Asian sea bass 45 Atlantic halibut 51 Atlantic salmon 55 Tilapias Pacific salmonids Carps Eels Sea basses Sea breams Species Dietary Protein (%) Freshwater basses Trouts Flatfishes Catfish Beef cattle 7-18 Dairy cattle Sheep 9-15 Swine Poultry but require amino acids, not protein Halver and Hardy 2002
8 ESSENTIAL AMINO ACID REQUIREMENTS Essential Amino Acids Estimated Requirement (Rainbow Trout) Fish Meal Composition Arginine Histidine Isoleucine Leucine Lysine Methionine Phenylalanine Threonine Tryptophan Valine All data expressed as % crude protein Halver and Hardy 2002; Omega Protein, Inc. 2006
9 Fish have high lipid demands too Species Dietary Lipid (%) Trout Other salmonids Tilapia <10 Sea breams Carp <18 Sea basses Yellow tail 11 Red drum 7-11 Grouper Species Dietary Lipid (%) Milk fish 7-10 Catfish 5-6 Turbot <15 Sole 5 Beef cattle 1-2 Dairy cattle Sheep Swine 2-6 Poultry ~3 but require fatty acids, not lipid Guillaume et al. 2001
10 18:0 18:1n-9 Δ9 Δ12 18:2n-6 Δ6 18:3n-6 C20 20:3n-6 Δ5 Δ6 Δ15 18:3n-3 18:4n-3 C20 20:4n-3 Δ5 22:6n-3 Short 20:4n-6 24:6n-3 Δ6 24:5n-3 C24 20:5n-3 C22 22:5n-3
11 18:0 18:1n-9 Δ9 Δ12 18:2n-6 Δ6 18:3n-6 C20 20:3n-6 Δ5 Limited physiological functions Δ6 Δ15 18:3n-3 18:4n-3 C20 20:4n-3 Δ5 22:6n-3 Short 20:4n-6 24:6n-3 Distinct physiological functions Δ6 24:5n-3 C24 20:5n-3 C22 22:5n-3
12 18:0 18:1n-9 Δ9 Δ12 18:2n-6 Δ6 18:3n-6 C20 20:3n-6 Δ5 Δ6 Δ15 18:3n-3 18:4n-3 C20 20:4n-3 Δ5 22:6n-3 Short 20:4n-6 24:6n-3 Δ6 24:5n-3 C24 20:5n-3 C22 22:5n-3
13 Species Rainbow trout ESSENTIAL FATTY ACID REQUIREMENTS Advanced Juvenile/ Adult Requirement 18:3n-3 ( %) n-3 LC-PUFA ( %) Fish Oil Composition 18:2n-6 (~1.7%) 18:2n-6 (1.0%) Common carp 18:3n-3 (~2.0%) 18:3n-3 ( %) 18:3n-3 (~2.0%) Tilapia 18:2n-6 ( %) 20:5n-3 (~13%) Various Pacific salmonids Gilthead seabream Red seabream 18:2n-6 (1.0%) 18:3n-3 (1.0%) 20:5n-3 22:6n-3 (~13%) (~15%) n-3 LC-PUFA ( %) LC-PUFA (~30%) 22:6n-3 (~15%) 22:6n-3 (0.5%) 20:5n-3 (1.0%) Striped jack 22:6n-3 (1.7%) All values reported as % of dry diet LC-PUFA (~30%) Halver and Hardy 2002
14 GROWTH HAPPENS WHEN LIMITING RESOURCES BECOME AVAILABLE AND IS AS FAST AS THE SLOWEST PROCESS Protein Micronutrients Lipid Carbohydrates All the building blocks must be available before new molecules or tissues can be synthesized
15 Membrane Competence Reproduction Pigmentation Metamorphosis Metabolic Regulation Behavior Stress Response Endocrine Status Seafood Quality Antioxidative Defense Immunity & Survival Macro- & Micronutrients Growth & Development Biosynthetic Rates Appetite Regulation Osmoregulation Cell Signaling Energy Substrates Tocher 2003, Li et al. 2008
16 GENERALIZED AQUAFEED FORMULATIONS Ingredients High Energy (Carnivorous) Medium Energy (Carnivorous) Low Energy (Omnivorous) Fish meal Soy products Gluten products Cereal grains Fats/oils Other Current price ($USD/MT) > <500 while the inclusion level of fish meal in feed is 25 percent, it actually accounts for 43 percent of raw material costs and 32 percent of total production costs. Alternative proteins such soybean, wheat and corn gluten, which can make up 45 percent of volume, account for 19 percent of raw material costs. Seafood Source 2010
17 WHAT WILL LIMIT THE GROWTH OF AQUACULTURE? Fish Meal Price in $US/MT Aquaculture consumes ~61% of global supply much research has focused on finding replacements for fish meal Partial replacements have been achieved. However, no dramatic breakthroughs have been reported, and the share of fish meal and fish oil used in aquaculture is increasing FAO 2008
18 WHAT WILL LIMIT THE GROWTH OF AQUACULTURE? Fish Oil Price in $US/MT Aquaculture consumes ~74% of global supply given the difficulty in replacing fish oils it is clear that competition for fish oil is likely to be a more serious obstacle for some sections of the aquaculture industry. (FAO 2008)
19 FEEDSTUFF ATTRIBUTES TO CONSIDER Compositional profile and practical feeding value Protein content and quality Carbohydrate levels Presence of antinutritional factors Economic and environmental costs of raw materials Availability Cost-effectiveness relative to marine ingredients AND other feedstuffs Sustainability Influence on product quality Nutritional value Safety
20 FEEDSTUFF ATTRIBUTES TO CONSIDER Compositional profile and practical feeding value Protein content and quality Carbohydrate levels Presence of antinutritional factors Economic and environmental costs of raw materials Availability Cost-effectiveness relative to marine ingredients AND other feedstuffs Sustainability Influence on product quality Nutritional value Safety
21 CARBOHYDRATES IN AQUAFEEDS Digestion is limited by enzyme production Utilization is limited by ability to metabolize effectively Laporte et al., unpublished data
22 ANTINUTRITIONAL FACTORS IN AQUAFEEDS Protease inhibitors reduce protein digestibility Lectins irritate the intestinal epithelium Phytic acid reduces protein and P digestibility Saponins toxic, reduce feed intake Antigenic compounds cause allergic responses 50% soy diet 80% soy diet Burrells et al. 1999, Francis et al. 2001
23 SUSTAINABILITY MARKETING OF FARMED FISH Customers and retailers are increasingly focused on seafood sustainability criteria Fish meal/fish oil usage negatively affects rankings
24 FISH OIL SPARING AND NUTRITIONAL VALUE Line of Equality LC-PUFA 22:6n-3 LC-PUFA 22:6n-3 22:5n-3 22:5n-3 20:5n-3 20:5n-3 20:4n-6 20:4n-6MC-PUFA 18:3n-3 MC-PUFA 18:3n :0 16:0 16:0 18:0 18:0 SFA SFA 16:1n-7 16:1n-7 18:1n-7 18:1n-9 18:1n-7 MUFA 18:2n-6 18:1n-9 MUFA 18:2n :0 Line 67% of FO Equality 67% 33% FO FO 33% 0% FO FO 0% FO Fish oil sparing affects fillet composition and associated nutritional value Trushenski et al. 2011
25 MINIMIZING LOSS OF NUTRITIONAL VALUE n-3 MC-PUFA No growth effects Substantial LC-PUFA loss Trushenski and Boesenberg 2009 SFA No growth effects Limited LC-PUFA loss Trushenski et al MUFA/SFA No growth effects Limited LC-PUFA loss Trushenski 2009
26 RENDERED FATS HELP MAINTAIN NUTRITIONAL VALUE Gause and Trushenski 2013
27 RENDERED FATS HELP MAINTAIN NUTRITIONAL VALUE Gause and Trushenski 2013
28 SAFETY OF FARMED FISH Although there is variability in contamination levels, fish oil is a potential source of persistent organic pollutants Risks of contaminants in farmed fish are largely overblown Risk outweighed by benefits of seafood consumption National Academies Institute of Medicine Food and Agriculture Organization World Health Organization BUT, perception is reality and feeding rendered fats can reduce contaminant burdens
29 THE CHALLENGES Fish meal and oil are finite resources which aquaculture increasingly monopolizes Sources of amino acids abound, but may be improperly balanced, unpalatable Alternative proteins impact production performance, livestock resilience, etc. Sources of essential fatty acids can be limiting Alternative lipids affect fillet nutritional value, product safety reproductive performance, etc.
30 THE OPPORTUNITIES Strategic use of resources including rendered animal products solves problems
31 ACKNOWLEDGMENTS Authors of the various works cited herein Fats and Proteins Research Foundation Center for Fisheries, Aquaculture and Aquatic Sciences
OPPORTUNITIES FOR RENDERED PRODUCTS IN AQUACULTURE Advancing science & industry through partnership
OPPORTUNITIES FOR RENDERED PRODUCTS IN AQUACULTURE Advancing science & industry through partnership Jesse T. Trushenski CENTER FOR FISHERIES, AQUACULTURE, & AQUATIC SCIENCES THE WORLD IS HUNGRY CGIAR CCAFS
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