Xiaoyi Wu

Effects of Different Corn Starch Levels on Growth, Protein Input, and Feed Utilization of Juvenile Hybrid Grouper (male Epinephelus lanceolatus × female E. fuscoguttatus)

AbstractAn 8-week growth trial was conducted to study the effects of different corn starch levels on growth and feed utilization of juvenile hybrid grouper (male Giant Grouper Epinephelus lanceolatus × female Brown-marbled Grouper E. fuscoguttatus). Five isonitrogenous (48% crude protein, dry weight basis) and isolipidic (10% crude lipid, dry weight basis) diets were formulated to contain 0, 7, 14, 21, or 28% corn starch, respectively. Each dietary treatment had three replicates. Groups of 22 hybrid grouper juveniles (average initial weight, 2.74xa0g/fish) were stocked into small floating cages (120xa0cm long × 70xa0cm wide × 50xa0cm high). Triplicate groups of fish were fed each dietary treatment twice daily (0800 and 1600xa0hours) to apparent satiation. Water quality was monitored daily. Weight gain (WG) of hybrid grouper displayed no significant differences among all experimental groups. Fish fed 0% corn starch had significantly higher daily protein intake than fish fed 7, 14, 21, and 28% corn starch. The feed c...

Effects of Different Dietary Carbohydrate/Lipid Ratios on Growth, Feed Utilization and Body Composition of Early Giant Grouper Epinephelus Lanceolatus Juveniles

An 8-week growth trial was undertaken to determine effects of different dietary carbohydrate (CHO)/lipid (L) ratios on growth, feed utilization and body composition of early giant grouper Epinephelus lanceolatus juveniles. Five isoenergetic (4.1 kcal/g) and isonitrogenous (50% CP, dry-matter basis) experimental diets were formulated to contain different crude lipid (CL) levels (22%, 19.8%, 17.6%, 15.4% or 13.2%, dry-matter basis) and together different corn starch levels (0%, 4.95%, 9.9%, 14.85% or 19.8%), thereby forming different dietary CHO/L ratios. Groups of 41 early giant grouper juveniles (average initial weight of 0.397 g/fish) were stocked into small floating cages (L 120 cm × W 70 cm × H 50 cm). Triplicate groups of fish were fed each dietary treatment three times daily to apparent satiation.