Tài liệu Advances in Shrimp Nutrition pptx

Basic Nutritional RequirementsProtein levels are species and rearing environment dependent Similar Vitamin and Mineral Requirements... Beta 1,3 1,6 glucans Structure very important for

Advances in Shrimp Nutrition

Stephen G Newman Ph.D.

President Aqua-In-Tech Inc.

Basic Nutritional Requirements

Protein levels are species and rearing environment dependent

Similar Vitamin and Mineral Requirements

Beta 1,3 1,6 glucans

 Structure very important for activity

 Continuous feeding unwise practice

 Non-specific immunity

– Short term

– Weakened by stress and high levels of pathogens

Saccharomyces cereviseae

Glucan Structure

Glucan testing

Harbor Branch Oceanographic Institute

3 levels incorporated into feed

Post larval P vannamei

Fed for several weeks prior to exposure to WSSV bacterial suspension

Mortalities followed for 7-10 days and tabulated

Glucan Effective Against WSSV

Bacterial Cell Walls

From both common groups of bacteria Gram Positive-Peptidoglycan

Gram Negative-Lipopolysaccharide

Peptidoglycan

Peptidoglycan

Lipopolysaccharide

Lipopolysaccharide

Itami et al Late 1980’s Kuruma prawns

8 to 11 adults (20 grams each)

1% suspension of dead bacterial material

1-immersion for one hour

2-Sprayed for 10 secs

3-Injected

30 days later injected with virulent strain of vibrio

Comparative survival of kuruma prawns exposed to virulent

vibrio species 30 days post exposure to a dead vibrio suspension (after Itami et al.)

Basic building blocks of DNA and RNA

Needed for all metabolic function

Stimulates Intestinal flora

Increases number of immunocompetent cellsIncreases antibody titers

Modulates glandular activity

No residues

Potentiates activity of antibiotics, vaccines and other compounds

Nucleotides

Fucoidan

Fucoidan

Substantial Protective benefit

Determined to be due to the sulfate group Used a 70% pure product-$1300/kg

Wide variety of compounds being examined with possible beneficial effects including

Levamisole, mushroom extracts such as

VitaStim, lactoferrins, various herbal extracts, MOS, etc

Most IMPORTANT

HUSBANDRY, SPF animals to start with,

Good water quality management

Combination of approaches might be the best

Important that animals have optimal nutrition,

minimal stress and good pathogen control