Sin título
- 1998
- 71-84
This study aimed to determine the influence of microalgal species and food concentration=520 \\ on various physiological parameters and Scope for Growth (SFG) in adults of 2 pearl oysters, Pinctada=520 \\ margantifera and P maxima. Clearance rate, pseudofaecal production rate, absorption efficiency, respiration=520 \\ rate and excretion rate were determined over a range of food concentrations using 2 microalgal=520 \\ diets, Tah~tian Isochrysis sp. (T-Iso) and Dunaliella primolecta at 28'C. Clearance, pseudofaecal production=520 \\ and respiration rates were significantly affected by microalgal diet. From these results, and=520 \\ because of the higher energy content of T-Iso, pearl oysters feeding on T-lso had maximum values of=520 \\ SFG that were 1.5 to 2 1 times higher than when feeding on D. pnmolecta. Clearance rate and absorption=520 \\ efficiency were significantly related to food concentration as negative exponential relationships=520 \\ (p c 0 001). Generally, pseudofaecal production, respiration and excretion rates were significantly=520 \\ related to food concentration as positive linear relationships (p < 0.005) Optimal food concentrations=520 \\ for max~mumS FG for P margarjtifera and P maxima were 1 to 2 mg I-' and 2 to 3 mg I-', respectively.=520 \\ P. maxima was better adapted to a wider range of food concentrations. P. maxima maintained positive=520 \\ SFG up to 9 mg I-' food concentration when feeding on T-lso and up to 7 mg I-' when feeding on D.=520 \\ primolecta, while equivalent values for P. margaritifera were 7 mg 1-' and 5 mg I-', respectively. Thesc=520 \\ results are in accordance with P. maxin~a occurring in a wider range of habitats than P margaritiferd,=520 \\ and experiencing greater concentration ranges of suspended particulate matter
Pinctada margaritifera
Ostra perlera de labios negros
Feeding
Bivalve
Pinctada marydritifera
Pinctada maxima
Food Suspension feeding Scope for Growth Energy
This study aimed to determine the influence of microalgal species and food concentration=520 \\ on various physiological parameters and Scope for Growth (SFG) in adults of 2 pearl oysters, Pinctada=520 \\ margantifera and P maxima. Clearance rate, pseudofaecal production rate, absorption efficiency, respiration=520 \\ rate and excretion rate were determined over a range of food concentrations using 2 microalgal=520 \\ diets, Tah~tian Isochrysis sp. (T-Iso) and Dunaliella primolecta at 28'C. Clearance, pseudofaecal production=520 \\ and respiration rates were significantly affected by microalgal diet. From these results, and=520 \\ because of the higher energy content of T-Iso, pearl oysters feeding on T-lso had maximum values of=520 \\ SFG that were 1.5 to 2 1 times higher than when feeding on D. pnmolecta. Clearance rate and absorption=520 \\ efficiency were significantly related to food concentration as negative exponential relationships=520 \\ (p c 0 001). Generally, pseudofaecal production, respiration and excretion rates were significantly=520 \\ related to food concentration as positive linear relationships (p < 0.005) Optimal food concentrations=520 \\ for max~mumS FG for P margarjtifera and P maxima were 1 to 2 mg I-' and 2 to 3 mg I-', respectively.=520 \\ P. maxima was better adapted to a wider range of food concentrations. P. maxima maintained positive=520 \\ SFG up to 9 mg I-' food concentration when feeding on T-lso and up to 7 mg I-' when feeding on D.=520 \\ primolecta, while equivalent values for P. margaritifera were 7 mg 1-' and 5 mg I-', respectively. Thesc=520 \\ results are in accordance with P. maxin~a occurring in a wider range of habitats than P margaritiferd,=520 \\ and experiencing greater concentration ranges of suspended particulate matter
Pinctada margaritifera
Ostra perlera de labios negros
Feeding
Bivalve
Pinctada marydritifera
Pinctada maxima
Food Suspension feeding Scope for Growth Energy