Juvenile Astacus astacus (initial b.w.: 0.98 +/- 0.06 g) were cultured (30 crayfish/m(2)) in 2001 tanks for 69 days. The experimental design was composed of three treatments as follows: control diet (C) (crude protein: 28.4% of the total dried matter, "DM"; ether extract: 6.22% DM), water cress (W) (crude protein: 20.7% DM; ether extract: 1.9% DIVI) and control diet + water cress (C + W) with thee replicates per treatment. Relative growth rate improved significantly (P < 0.05) in crayfish fed C + W (+ 110%) compared to W (+ 43%) and the control diet (+ 36%). Gross protein and lipid retentions of the treatment C + W were significantly higher than the control diet and water cress fed alone. At the end of the experiment, a higher survival rate of A. astacus was observed (P < 0.05) in the treatment C + W (67%) and C (71%) compared to the W (58%). These results suggest that the plant water cress (Nasturtium officinale) can be used as supplemental food in noble crayfish feeding.
Utilization of water cress (Nasturtium officinale L.) in noble crayfish (Astacus astacus) feeding
D'AGARO, Edo
2006-01-01
Abstract
Juvenile Astacus astacus (initial b.w.: 0.98 +/- 0.06 g) were cultured (30 crayfish/m(2)) in 2001 tanks for 69 days. The experimental design was composed of three treatments as follows: control diet (C) (crude protein: 28.4% of the total dried matter, "DM"; ether extract: 6.22% DM), water cress (W) (crude protein: 20.7% DM; ether extract: 1.9% DIVI) and control diet + water cress (C + W) with thee replicates per treatment. Relative growth rate improved significantly (P < 0.05) in crayfish fed C + W (+ 110%) compared to W (+ 43%) and the control diet (+ 36%). Gross protein and lipid retentions of the treatment C + W were significantly higher than the control diet and water cress fed alone. At the end of the experiment, a higher survival rate of A. astacus was observed (P < 0.05) in the treatment C + W (67%) and C (71%) compared to the W (58%). These results suggest that the plant water cress (Nasturtium officinale) can be used as supplemental food in noble crayfish feeding.File | Dimensione | Formato | |
---|---|---|---|
kmae200638018(2).pdf
non disponibili
Tipologia:
Altro materiale allegato
Licenza:
Non pubblico
Dimensione
48.43 kB
Formato
Adobe PDF
|
48.43 kB | Adobe PDF | Visualizza/Apri Richiedi una copia |
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.