Monday, August 20, 2007

Technical Advancements in Extruded Shrimp Feeds

Wenger Mfg., Inc., Kansas, USA

This presentation will cover the current possible technology used in production of shrimp feeds via extrusion and the advantages of this method of production.

The review will cover all aspects of this process from the raw materials through to drying and cooling before packaging.

The final product quality aspects of shrimp feeds via extrusion compared to other processing methods will also be presented.

Starter Aqua Feed Technology

Will Henry, Extru-Tech, Inc., Kansas, USA

a. Size Comparison
b. Poor Pellet Construction
c. Preferred Pellet Construction

2. Mixing Considerations
a. Dedication
b. Grinding/Pulverising
c. Sifitng (Pre & Post Production)

3. Starter Diet Production
a. Pellet & Crumble
1. Overview
2. Pros and Cons
b. Direct Extrusion
1. Overview
2. Pros and Cons
c. Spheronise & Agglomerate
1. Overview
2. Pros and Cons

4. Vitamin Survival
a. Vitamin Uses
b. Vitamin Survival
c. Comparison

5. Flexibility

6. Research Results
a. FCR
b. Uniformity
c. Water Quality / Waste Management
d. Survival Rates

7. Q&A

Ingredient Trends and the Effects on the Extrusion Process

Galen J. Rokey, Manager, Wenger Mfg., Inc., Kansas, USA
I. Benefits of proper particle size in raw materials
a. Product appearance
b. Reduction of blocked die orifice
c. Ease of cooking
d. Increase in throughputs

II. Protein constituents in recipe
a. Functional versus non-functional sources
b. Impact of high levels of vegetable proteins

III. Starch components of the recipe
a. Starch functionality
b. Recommended starch levels

IV. Effects of fat in the diet
a. Internal versus external fat addition
b. Impact of fat levels on the product technical properties
c. Proper analysis methods for fat levels

V. Role of minor ingredients
a. Vitamins and pigments
b. Humectants and other preservatives
c. Rework

Wednesday, August 15, 2007

Beyond Pre-Conditioning – Reducing Carbon Footprint and Increasing Quality

Colin Mair, Cormal Technology Ltd., U.K.
Email :

The presentation will be on upstream processing to improve process efficiencies.

It will explore work done on early pre-hydration and the effect on improved production rates, the hydration being either/and combinations of grain tempering and last minute addition of water to ground powders before going into the storage bin that feeds the extruder.

Also there will be discussion of high speed continuous mixer/choppers to hydrate and add other liquids before the conditioner, and the theory that supports these technologies.

Also ways of misting steam and water into existing conditioners and the beneficial effect of these. Also the effect of pre-heating conditioning water.

The presentation will be an overview of techniques that are available to improve product quality through homogenous mixing and heating and to improve production rates and reduce machine wear.

Wednesday, August 01, 2007

The (South Antarctic) Krill Industry - How far can krill derivatives become a real feed ingredient substitute? - A Brief Industry Overview

Dimitri Sclabos, General Manager, Tharos Ltd. E-mail : -

Much has been said about South Antarctic Krill (Euphausia superba, Dana) species products, specifically meals and oils, becoming sustainable, competitively priced aquafeed ingredient replacements for brown fishmeal and fish oils.

Undoubtedly krill meals and oils have unsurpassed nutritional qualities that aquafeeds can and should profit from. Nonetheless, feed manufacturers should count on them as one-more feed component alternative rather than being an entire substitute option.

There are three relevant aspects of this fishery that will preclude South Antarctic Krill derivatives from becoming stable, price-competitive feed ingredients; processing and logistic complexities, owner/processors’ options of alternative higher value-added routes and environmental and regulatory aspects.

Processing complexities abound, no matter how simple it may be seen to process “just another pelagic” species, South Antarctic Krill has not proved to be another “typical pelagic species”. Logistic aspects are also difficult to work with, in relation to the area where it is captured and processed as well as the costs involved for this operation.

For key fishing operators (owners), although feed-grade krill meals and oils are relevant end-product targets, there are also other krill derivatives that may add much more value to the at-sea operation, for example pharma-grade krill oils (phospholipids-rich), food-grade whole frozen krill and white tablecloth food-grade meats.

Environmental and regulatory aspects will and need to be seriously addressed in order to prevent the South Antarctic Krill face the same detrimental fishing effort seen on other species if it wants to become a sustainable and environmental-friendly resource option. The major over fishing risk relies on the South Antarctic Krill species’ being key resource for the entire South Antarctic trophic feed-chain.

For more information and to register for Aquafeed Horizons Asia, visit

Palatability Improvement in Shrimp Feed

Dr Vincent FOURNIER, R&D Manager AQUATIV. Email:

To contend with the palatability problems that have arisen as a result of fishmeal replacement in aquafeed, Aquativ has been developing and selling natural attractants for more than four years. Excellent feed intake and growth improvement have already been obtained in laboratory and with aquafeed producers in various species such as european seabass, atlantic salmon, yellowtail.

Some recent trials were conducted in shrimp (penaeus vannamei) in well known testing facilities: the objective was to demonstrate if a good level of palatability could be reached using natural attractants in shrimp diets containing low levels of fish meal.

Growth and preference trials were conducted. Several PE were added to feed formula containing low fish meal levels (LFM), and compared with formula containing a high level of fish meal (HFM) without PE. Shrimps were fed to satiety by feeding trays for 70 and 15 days in growth and preference trials, respectively.

No significant difference was observed between HFM and LFM diet showing that scarce raw materials like fish meal could be successfully replaced with more available plant based raw material when using natural attractants.

For more information and to register for Aquafeed Horizons Asia, visit

The Development Of Novel Feeding Attractants For Sustainable Aquaculture

Centre for Environment, Fisheries and Aquaculture Science, Pakefield Road,Lowestoft, Suffolk NR33 0HT, United Kingdom. Email:

Since 2001 the Centre for Environment, Fisheries and Aquaculture Science (CEFAS) has been developing a range of novel feeding attractants to support the development of sustainable aquaculture. The attractants, which are nature identical chemosensory stimulants have been shown in a series of laboratory tank trials to increase feeding activity in a range of fish species.

The feeding attractants, which are in the form of a liquid-formulation are added to the water prior to the addition of the feed. The feeding attractants developed for European cod, (Gadus morhua) tilapia (Oreochromis niloticus) and a penaeid shrimp (Litopenaeus vannamei) have been tested under commercial conditions in hatcheries and production facilities in Norway, China and Thailand.

Initial data from the feeding trials indicate that the application of the feeding attractants resulted in a significant increase in growth of all three species. The results of the studies are also discussed in relation to the application of the feeding attractants for use with reduced fish protein based commercial feeds.

For more information and to register for Aquafeed Horizons Asia, visit