Appropriate Proportion of Water Meal (Wolffia arrhiza (L.)) and Commercial Diet in Combined Feeding for Tilapia Fingerlings Rearing
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Abstract
Studying the growth performance of tilapia fingerlings fed with different proportions of dried water meal and commercial diet was carried out. The experiment consisted of 4 treatments and 3 replications that produced in 0.15 m3 circle cement pond (50 fingerlings per unit). Fingerlings were fed commercial diet (CD) combined with dried water meal (DWM) at 100:0 (control treatment), 70:30, 50:50 and 30:70 for 75 days and the average initial weight of fish were 0.82±0.02 g, 0.85±0.05 g, 0.76±0.11 g and 0.74±0.04 g respectively which no significant difference (p>0.05). The results indicated that fish gradually grew throughout the experiment. The average weight gain, average daily growth and average specific growth rate of fish fed with 100:0 of CD and DWM showed significantly higher (p<0.05) than other treatments (10.54±1.15 g 0.14±0.01 g day-1 and 3.54±0.14 % day-1 respectively). In the parts of feed conversion ratio, fish were fed 100:0 of CD and DWM showed significantly lower (p<0.05) than other treatments (1.61±0.18) but no significant difference when compared with 70:30 of CD and DWM feeding (2.21±0.58). DWM might not be suitable for direct feeding however its adventage could make fat accumulation in fish body lower than fish fed with 100% of CD and revealed high protein level in their body. The combined feeding between CD and DWM at 70:30 could reduce feed cost about 12.60% and showed no contrast on feed conversion ratio when compared with 100% CD feeding that is the best choice for DWM utilization.
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