Substitution of the Fish Meal by Maggot Meal in the Feed of Nile Tilapia Oreochromis Niloticus at Different Stages of Growth (Published)
The present study was conducted to evaluate the use of maggot meal as a protein source in the place of fish meal to feed tilapia Oreochromis niloticus at different stages of growth. The average weight for larval stage (ST1) was 20 ± 4 mg and those of juvenile stage (ST2) and adult stage (ST3) were ranged respectively from 0.62-0.75 g and 20-29 g. The control diet (fish diet [FD]) and the commercial diet (CD) were used to compare the test diet (maggot diet [MD]). The fish were fed four times daily to triplicate groups at 30-20% body weight for consecutive 30 days for ST1 and at 10-7% body weight for consecutive 90 days for ST2. Concerning the adult stage, fish were fed twice times daily to duplicate groups at 5-2% body weight for consecutive 180 days. After this days, fish fed with MD had the highest (p ≤ 0.05) mean daily gain (ADG) (24.33 ± 10 mg.day-1, 0.3 ± 0.03 g.day-1 and 1.80 ± 0.83 g.days-1 respectively ST1, ST2 and ST3) compare to those obtained by fish fed FD (22.9 ± 20 mg.day-1, 0.22 ± 0.18 g.day-1 and 1.59 ± 0.79 g.days-1 respectively ST1, ST2 and ST3). Therefore, the fish fed with CD had the lowest (p≤ 0.05) ADG (20.2 ± 10 mg.days-1, 0.19 ± 0.12 g.day-1 and 1.47 ± 0.86 g.days-1 respectively ST1, ST2 and ST3) than those obtained by FD. The specific growth rate (SGR), feed conversion ratio (FCR), survival rate (SR), the production cost of 1 kg of fish (PC) and the carcass chemicals composition were evaluated. In conclusion, these results of this study indicate the possibility of completely using maggot meal as a source protein in the diet of Oreochromis niloticus at different stage of growth to increase the growth of this specie and reduce the cost of 1 kg of fish produced.
Keywords: Nil tilapia, maggot feeds, zootechnic and economics parameters
Substitution of the Fish Meal by Maggot Meal in the Feed of Nile Tilapia Oreochromis Niloticus at Different Stages of Growth (Published)
The present study was conducted to evaluate the use of maggot meal as a protein source in the place of fish meal to feed tilapia Oreochromis niloticus at different stages of growth. The average weight for larval stage (ST1) was 20 ± 4 mg and those of juvenile stage (ST2) and adult stage (ST3) were ranged respectively from 0.62-0.75 g and 20-29 g. The control diet (fish diet [FD]) and the commercial diet (CD) were used to compare the test diet (maggot diet [MD]). The fish were fed four times daily to triplicate groups at 30-20% body weight for consecutive 30 days for ST1 and at 10-7% body weight for consecutive 90 days for ST2. Concerning the adult stage, fish were fed twice times daily to duplicate groups at 5-2% body weight for consecutive 180 days. After this days, fish fed with MD had the highest (p ≤ 0.05) mean daily gain (ADG) (24.33 ± 10 mg.day-1, 0.3 ± 0.03 g.day-1 and 1.80 ± 0.83 g.days-1 respectively ST1, ST2 and ST3) compare to those obtained by fish fed FD (22.9 ± 20 mg.day-1, 0.22 ± 0.18 g.day-1 and 1.59 ± 0.79 g.days-1 respectively ST1, ST2 and ST3). Therefore, the fish fed with CD had the lowest (p≤ 0.05) ADG (20.2 ± 10 mg.days-1, 0.19 ± 0.12 g.day-1 and 1.47 ± 0.86 g.days-1 respectively ST1, ST2 and ST3) than those obtained by FD. The specific growth rate (SGR), feed conversion ratio (FCR), survival rate (SR), the production cost of 1 kg of fish (PC) and the carcass chemicals composition were evaluated. In conclusion, these results of this study indicate the possibility of completely using maggot meal as a source protein in the diet of Oreochromis niloticus at different stage of growth to increase the growth of this specie and reduce the cost of 1 kg of fish produced.
The present study was conducted to evaluate the use of maggot meal as a protein source in the place of fish meal to feed tilapia Oreochromis niloticus at different stages of growth. The average weight for larval stage (ST1) was 20 ± 4 mg and those of juvenile stage (ST2) and adult stage (ST3) were ranged respectively from 0.62-0.75 g and 20-29 g. The control diet (fish diet [FD]) and the commercial diet (CD) were used to compare the test diet (maggot diet [MD]). The fish were fed four times daily to triplicate groups at 30-20% body weight for consecutive 30 days for ST1 and at 10-7% body weight for consecutive 90 days for ST2. Concerning the adult stage, fish were fed twice times daily to duplicate groups at 5-2% body weight for consecutive 180 days. After this days, fish fed with MD had the highest (p ≤ 0.05) mean daily gain (ADG) (24.33 ± 10 mg.day-1, 0.3 ± 0.03 g.day-1 and 1.80 ± 0.83 g.days-1 respectively ST1, ST2 and ST3) compare to those obtained by fish fed FD (22.9 ± 20 mg.day-1, 0.22 ± 0.18 g.day-1 and 1.59 ± 0.79 g.days-1 respectively ST1, ST2 and ST3). Therefore, the fish fed with CD had the lowest (p≤ 0.05) ADG (20.2 ± 10 mg.days-1, 0.19 ± 0.12 g.day-1 and 1.47 ± 0.86 g.days-1 respectively ST1, ST2 and ST3) than those obtained by FD. The specific growth rate (SGR), feed conversion ratio (FCR), survival rate (SR), the production cost of 1 kg of fish (PC) and the carcass chemicals composition were evaluated. In conclusion, these results of this study indicate the possibility of completely using maggot meal as a source protein in the diet of Oreochromis niloticus at different stage of growth to increase the growth of this specie and reduce the cost of 1 kg of fish produced.
Keywords: Nil tilapia, maggot feeds, zootechnic and economics parameters