The interest towards several marine microalgal species as sustainable dietary sources alternative to fish meal /oil and able in maintaining fish performances and health benefits of their flesh consumption, has good grounds. In fact microalgae can represent a potential alternative ingredient to supplement the diet of high-value fish species or in organic-based aquaculture systems, due to their high content of good-quality protein, bio-active compounds, antioxidants, vitamins, minerals and long chain n-3 and n-6 PUFAs (ARA, EPA, DHA). Oil extracted from microalgae have proven to successfully replace marine fish oil in diets for sea bream (Ganuza et al., 2008). Microalgae produced in controlled conditions using innovative photobioreactor technologies can supply products of constant and suitable quality to be included in aquafeed at relatively moderate prices. The marine microalga Isochrysis aff. galbana (T- ISO), showed high protein quantity and quality, lipids rich in LC-PUFA, DHA in particular, and a good vitamin pattern, therefore could have the potential to become a sustainable alternative dietary source and contribute to meet the increasing demand for fish meal/oil that is a critical limiting factor for the future expansion of aquaculture activities. A study was carried out to evaluate growth response, feed utilization and quality traits of the edible portion of sea bass (Dicentrarchus labrax) fed organic diets including dried Isochrysis aff. galbana (T-ISO). Three test isoproteic (50% DM) and isolipidic (18% DM) diets were compared. All preparations were formulated using "organic" ingredients. Isochrysis aff. galbana was incorporated to replace 10% (T- ISO10) and 20% (T- ISO20) protein supplied as dried fish meal which was the major protein source in the control diet (ORG). All diets were offered to apparent satiety to 12 groups of European sea bass juveniles under controlled environmental conditions (temperature 23°C; salinity 28 psu; light-dark cycle 12L:12D) according to a completely random design. Feeding the test diets over 70 days resulted in similar fish growth and feed utilisation. Apparent digestibility coefficients (ADCs) were measured in vivo using acid insoluble ash as indigestible marker. The effects of the dietary algae inclusion on the fillet composition were also considered.

Inclusion of the microalga Isochrysis aff. galbana in organic diets of European sea bass juveniles: effects on growth, feed utilisation and fillet composition

TULLI, Francesca;TIBALDI, Emilio;
2011-01-01

Abstract

The interest towards several marine microalgal species as sustainable dietary sources alternative to fish meal /oil and able in maintaining fish performances and health benefits of their flesh consumption, has good grounds. In fact microalgae can represent a potential alternative ingredient to supplement the diet of high-value fish species or in organic-based aquaculture systems, due to their high content of good-quality protein, bio-active compounds, antioxidants, vitamins, minerals and long chain n-3 and n-6 PUFAs (ARA, EPA, DHA). Oil extracted from microalgae have proven to successfully replace marine fish oil in diets for sea bream (Ganuza et al., 2008). Microalgae produced in controlled conditions using innovative photobioreactor technologies can supply products of constant and suitable quality to be included in aquafeed at relatively moderate prices. The marine microalga Isochrysis aff. galbana (T- ISO), showed high protein quantity and quality, lipids rich in LC-PUFA, DHA in particular, and a good vitamin pattern, therefore could have the potential to become a sustainable alternative dietary source and contribute to meet the increasing demand for fish meal/oil that is a critical limiting factor for the future expansion of aquaculture activities. A study was carried out to evaluate growth response, feed utilization and quality traits of the edible portion of sea bass (Dicentrarchus labrax) fed organic diets including dried Isochrysis aff. galbana (T-ISO). Three test isoproteic (50% DM) and isolipidic (18% DM) diets were compared. All preparations were formulated using "organic" ingredients. Isochrysis aff. galbana was incorporated to replace 10% (T- ISO10) and 20% (T- ISO20) protein supplied as dried fish meal which was the major protein source in the control diet (ORG). All diets were offered to apparent satiety to 12 groups of European sea bass juveniles under controlled environmental conditions (temperature 23°C; salinity 28 psu; light-dark cycle 12L:12D) according to a completely random design. Feeding the test diets over 70 days resulted in similar fish growth and feed utilisation. Apparent digestibility coefficients (ADCs) were measured in vivo using acid insoluble ash as indigestible marker. The effects of the dietary algae inclusion on the fillet composition were also considered.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11390/883279
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