Starter Feeds – size and quality & live food substitution
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Transcript of Starter Feeds – size and quality & live food substitution
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Starter Feeds – size and quality& live food substitution
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• Tank design : Shape/Volume …
* Tank Hydrology : SWIMBLADDER/FEEDING SYSTEM …
* Water Management
* AERATION SYSTEM AND STRATEGY
* INSTALLATION OF JET SURFACE CLEANERS
* USE OF AUTOMATIC FEEDERS : ARTEMIA / ARTIFICIAL DIETS
* INSTALLATION OF BOTTOM SIPHONING DEVICES
* LIGHT SYSTEM AND STRATEGY
FEEDING - WEANING STRATEGY, -REGIME, -FREQUENCY
PHYSICAL AND BIOLOGICAL CRITERIA
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Feed technologiesExtrusion technologies
Species specific requirements
Legislative restriction of ingredients, labeling and traceability
Bio-availability of macro and micro components
Natural solutions promoting health and performance
Environmental impact concerns ( Nitrogen, Phosphorous etc.)
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Feeding & nutrition during early larval stages
Feed characteristics:• Reduced food particle encounter & catchingReduced food particle encounter & catchingTriggering mechanismTriggering mechanismParticle floatabilitParticle floatabilit
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Early weaning 1. Essential co-feeding
2. High quality diet3. Management
strategy
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Weaning 1. Division of the tank into Zones
2. Good water exchange
3. Tactical feed distribution
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Artemia
Feeder WaterInlet
Air stone
SurfaceOutlet
BottomOutlet
25-35 % 65-75 %
Hydrology - good
30 % Angle inflow
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Artemia Feeder WaterInlet
Air stone
BottomOutlet
Hydrology - Bad
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Feeders
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Automatic & Semi-automatic Feeding Automatic & Semi-automatic Feeding systemssystemsLive food feeding Pond and tank feeding
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Early weaning, co-feeding diets vs live food
LIVE FOOD DRY FEEDNaturally perfectly buoyant Mostly sinking
Naturally perfectly encapsulated
Very fast leaching
Contains large fractions of soluble protein, small peptides: digestibility
Insoluble protein
Nutritionally imbalanced Nutritionally well balanced
Not always right size All sizes possible
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Optimal phospholipid level in larval diets (Cahu et al. , in press)
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Highest levels of phospholipids, p-choline and p-inositol gave the best survival and lowest malformations
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Performances of Mediterranean sea bass fed experimental diets to day 40
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"Gemma Micro"PL+DTPVit- def.
11% of phospholipids is sufficient to ensure good larval development.An addition of protein hydrolysate induces lower growth and survival rate.A decrease in vitamin and mineral content creates high percentage of deformed larvae.
Nutreco
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Development of New weaning diets
STABLEBUOYANT
PARTICLE SIZEPALATABLEDIGESTIBLENUTRITIOUS
Feed technologyFormulation
Development enzymatic capacityNutritional requirements
Zootechnics
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Physical characteristics
STABLEBUOYANT
PARTICLE SIZEPALATABLEDIGESTIBLENUTRITIOUS
• processing– twin screw extrusion– break and sieve
technology• formulation
technology– internal fat– binding
• quality control
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Palatability• selection of raw
materials– protein quality
• TVN• biogenic amines• soluble protein• free amino acids• AA balance• others..
– fat quality• POV, Totox, Anisidine
• nutritional balance
STABLEBUOYANT
PARTICLE SIZEPALATABLEDIGESTIBLENUTRITIOUS
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Digestibility
• Digestible protein– screening/selection of
protein sources• Digestible fat• Digestible starch• Digestible/metabolisable
energy– reduce starch– reduce ash content– high dig protein– high dig fat
• Gentle processing
STABLEBUOYANT
PARTICLE SIZEPALATABLEDIGESTIBLENUTRITIOUS
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Feed development
• Feeding strategies evolved over years– Broodstock
• Egg quality, Larval quality, nutrition– Live food
• Optimization – Nutrition >> enrichment– Production >> high density cultures, hatching
• Automation >> devices• Hygiene >> Disinfection• Availability >> Sources
– Feeds• Co-feeding practices >> early weaning• Fast weaning
• Concerns• What is the effect on deformities???
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Bream Protocol per M³
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Co Feeding
Protocol for small larvae
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ITC feeding protocol for Bass
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Protocol for larger larvae
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Wet feeding technique
During the co-feedingco-feeding stage, ‘wet’ feeding is recommended.
Add some diet in a beaker of water at 10g/l
Stir very gently Feed to larvae in small doses like feeding Artemia
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Second phase: adaptation of the larvae : START of weaning As soon as the larvae are used to the presence of the feed particles, the amount of Artemia is gradually decreased in favour of the diets.
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Third phase: MID weaning
Artemia concentration continues to decrease. At the same time part ofthe PROTON 2 (150-300 µm) is gradually replaced by PROTON 3(200-400 µm) .
Final phase: END weaning
Feeding Artemia is coming to an end. As larvae continue to grow, thePROTON 2&3 are further replaced by PROTON 4 until it is used asthe sole diet.
Nursery/pre-growth phase
Compound feeding is ± 100% automatically and no Artemia is given.The PROTON 4 is gradually replaced Lansy W3-NRD 3/5-ALFA 1.These diets are gradually replaced by the larger sizes of NRD-ALFAas the fish grow (see feeding regimes).
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Weaning fry at transfer - 40 days
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Larvae development(Cod)
• Yolk sac
• First feeding
• Larvae
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Larval development (Cod)• Newly hatched 4.5 mm• Open mouths Day 3• Take dry feed Day 14 (7mm)• metamorphosis Day 30 - 40 (12 mm)• sensitive period Day 45 - 60• first grading Day 60 at 0.2 gram• 2 gram size Day 90
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Cod larvaeDays Length Weight0 4 2.0 mg7 6 2.5 mg14 7 3.4 mg21 8 5.1 mg28 10 10.0 mg35 12 17.3 mg
Metamorphosis
Days Length Weight35 12 17.3 mg42 15 33.8 mg49 20 80.0 mg56 25 155 mg63 30 270 mg71 35 425 mg
First grade 1.5 mm
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Growth - length
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mm
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Growth - weight (CF=1)
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Larval survival
• Collection of good eggs - 80% (60 to 100%)• incubation of eggs - 65% (50 to 80%)• Hatched larvae to 8 mm - 45% (30 to 60%)• Weaning 8 to 14 mm - 30% (10 to 50%)• Nursery 14 to 40 mm - 65% (60 to 70%)Total survival from stocked egg to 40 mm 8%