Apparent Digestibility of Some Commercial Feeds for Snubnose Pompano, Trachinotus blochii
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Abstract
The study was conducted at the National Broodstock Center for Mariculture Species in Northern Vietnam (Center), Cat Ba, Hai Phong province, to evaluate the digestibility of protein (ADP), lipid (ADL) and energy (ADE) of some available commercial feeds for snubnose pompano, Trachinotus blochii, using indirect method with chromic oxidize (Cr203) 1% as inert marker. Experimental fish of 400 g/individual size were held in marine cags (cage size, 3 x 3 x 3 m) at a density of 10 fish/m3. The digestibility of three commercial aquafeed brands (protein contents of 46, 50 and 51% abbreviated as D46, D50 and D51, respectively, with three replicates). Fish were fed by hand to apparent satiety in the morning at 0900 hrs for 2 weeks to acclimate with experimental conditions. The faeces were then collected by manual stripping method for four weeks. Faeces after sampling were pooled in sealed bottles and stored at -20°C until analysed. The results showed that ADP significantly differed among feeds (P<0.05), with the highest value recorded for D51 (82.25%), followed by D50 at 75.17%, and D46 at 68.76%. ADE ofD51 feed (82.32%) was statistically higher than that ofD46 (66.63%) and D50 (68.20%) (P<0.05), while that of two latter feeds did not differ (P>0.05). The ADL values were relatively high and had no significant variation between D46 and D51 (P>0.05).
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References
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