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Istituto di scienza dell'alimentazione

Torna all'elenco Contributi in rivista anno 2008

Contributo in rivista

Tipo: Articolo in rivista

Titolo: Rheological behavior of polysaccharide based pellets for crayfish feeding tested on growth in the crayfish Cherax albidus

Anno di pubblicazione: 2008

Formato: Cartaceo

Autori: Volpe M.G., Monetta M., Di Stasio M., Paolucci M.

Affiliazioni autori: Department of Biological and Environmental Sciences, University of Sannio, Via Port'Arsa, 11, 82100 Benevento, Italy ISA-CNR Via Roma 52, 83100 Avellino, Italy

Autori CNR:


Lingua: inglese

Abstract: Two algal polysaccharides: alginate and agar and one polysaccharide from fruit, pectin, have been used as food additives in relation to their structure and their rheological behavior, stability and interactions, to generate firm pellets to be employed in crayfish aquaculture. Three diets containing the same amount of nutrients (protein, lipid and carbohydrate) mixed with each of the three different polysaccharides were tested on male freshwater crayfish Cherax albidus growth. The aims of this study were to examine the effect of alginate, agar and pectin, on pellet stability in water, and on crayfish growth. The kinetics of water absorption and solute leaching of pellets were measured by immersing quadruplicate samples of the diets in water for 0.5, 2, 4 and 8 h. After the required immersion time, the samples were recovered, freeze-dried for 24 h and re-weighed. Recovered liquid was analyzed by Low Angle Laser Light Scattering Technique, which allowed the monitoring of the released particles in water during immersion. At the same time, the crayfish feeding response to firm pellets was monitored in feeding behavior and growth experiments. Our results show that pellets had good water stability, were preferred by crayfish and the presence of polysaccharides positively affected crayfish growth. Indeed, animals fed pellets showed a higher percentage of growth when compared to animals fed a fresh diet. In particular, pectin gave the best results, showing better water stability than alginate and agar and causing the best growth performance. Pellets are relatively low cost and easy to make and they may represent an advantage for those who want to farm crayfish under intensive conditions.

Lingua abstract: inglese

Pagine da: 339

Pagine a: 346


Aquaculture Elsevier
Paese di pubblicazione: Paesi Bassi
Lingua: inglese
ISSN: 0044-8486

Numero volume: 274

DOI: 10.1016/j.aquaculture.2007.11.026

Referee: Ś: Internazionale

Indicizzato da: ISI Web of Science (WOS) [000253616100019]

Parole chiave:

  • Polysaccharide based pellets;
  • Rheological behaviour;
  • Crayfish;
  • Cherax

URL: http://www.elsevier.com/locate/aqua-online

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