Abstract
The purpose of this research is to evaluate Asian sea bass digestibility and growth fed with phytase dietary supplementation on soybean based fish diet. The initial weight of fish was 4.99±0.2 g with stocking density of 20 fishes per tanks reared in 80 L tank of sea water for 6 weeks. Completely Randomized Design of 50% soybean meal with phytase supplementation of 0; 500; 1,000; and 1,500 FTU kg-1 and three replication was used in this trial. Chromium oxide (Cr2O3) was used as digestibility indicator. Multivariate anova and One way anova (SPSS); linear regression (Microsoft Excel) and polynomial orthogonal (Microsoft Excel and Maple) was used to analyze the data. The results of Multivariate anova showed that phytase supplementation affect total digestibility (KCT) and relative growth rate (RGR) of asian seabass significantly (P<0.01) with phytase dose 1,000 FTU. One way anova also indicated that phytase 1,000 FTU significantly affect all parameters. Apparent digestibility coefficient (ADC) phosphorus had a very significant and dominant effect to total digestibility with R2 = 0.9669 than ADC protein and ADC fat (linear regression). KCT significantly affects efficiency of dietary protein (EPP) 30.57% and protein efficiency ratio (PER) 0.67%. EPP and PER significantly effect RGR 1.56% day-1, simultaneously. The optimal dose of phytase supplementation is 1,220 FTU.
Highlights
Lates calcarifer (Bloch), known as Asian seabass or barramundi, is a predatory fish but alsoan economically important fish species througout the Asia-Pacific region. Petersen et al (2011) explained that Asian seabass is a carnivorous, so it needs high dietary protein for fast and efficient growth.Vegetable protein sources such as soy flour are widely used as partial replacement of fish meal
Phytase effect on digestibility and growth Initial stage to analyze the effect of phytase enzyme treatment on digestibility and growth is manova analysis between dependent variable of total digestibility (TD) and relative growth rate (RGR) to independent variable of phytasedose
Tukey HSD multiple comparisons test for TD and RGR showed that the dose of 1,000 FTU was higher and significantly different than other doses
Summary
Petersen et al (2011) explained that Asian seabass is a carnivorous, so it needs high dietary protein for fast and efficient growth. Vegetable protein sources such as soy flour are widely used as partial replacement of fish meal. Silva-Carrillo et al, (2012) stated that soy flour has high protein content and a relatively balanced amino acid profile. The use of commercial soybean meal by 30 % can replace the role of fish meal in diet of juvenile Lateolabrax japonicus (Li et al, 2014). While Song et al (2014) stated that 15 to 50 % hydrolyzed soybean meal decreased feed conversion ratio and significantly improved growth parameters on juvenile Platichthys stellatus
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