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Phytase enzyme supplementation in feed is expected to increase the bioavailability of phosphorus and other nutrients. The present study aimed to evaluate the effect of phytase enzyme supplementation in feed on growth, mineral digestibility, amino acid digestibility and body chemical composition of common carp (Cyprinus carpio L.) fed with soybean meal at the rearing stage. The study used common carp fish with an average weight of 18.82 ± 0.26 g/head. The experimental feed was floating pellets supplemented with various doses of phytase enzyme: 0 (A), 500 (B), 1,000 (C) and 1,500 (D) FTU/kg feed. Mineral content (Ca, Mg, Fe, Cu, Zn and Mn) was analyzed from the dried fish feces using a polarized atomic absorption spectrophotometer. While Na and K contents were determined using a flame photometer, and P content was calorimetrically analyzed. The feed utilization efficiency (EFU), feed conversion ratio (FCR), protein efficiency ratio (PER), relative growth rate (RGR), survival rate (SR) and protein digestibility (ADCp) were determined. The results showed that common carp fed with 1000 FTU/kg phytase enzyme (C) exhibited the highest PER, FCR, EFU and RGR values, compared to other experimental feeds. Common carps given 1000 FTU/kg phytase enzyme (C) recorded the highest mineral values, including Ca, P, Na, K, Mg, Fe, Cu, Mn and Zn. Therefore, phytase enzyme supplementation in feed significantly (P<0.05) increased the growth, mineral digestibility, protein content and amino acid digestibility of C. carpio. The phytase enzyme at 1000 FTU/kg of feed was the best dose for common carp at the rearing stage. [ABSTRACT FROM AUTHOR]

The success of intensive aquaculture for river catfish juveniles (Pangasius hypophthalmus Sauvage, 1878) is determined by the availability of good quality feed. Good quality feed does not only contain protein required by the fish; it should also contain essential amino acids to support fish growth. Lysine is a constraint of amino acids in the formulation diet due to the characteristics of the plant-based protein with lysine deficiency. This study was conducted to determine the dietary effects of lysine river catfish juveniles on protein digestibility, body composition, and relative growth rate. The river catfish juveniles used in the study had a mean weight of 8.21 g ± 0.32 g fish –1 . The test feed contained 37.1 % and 19.76 MJ kg –1 . Doses of lysine in the feed were added in an increase of 0.25 g 100 g –1 [1.48 g; 1.73 g; 1.98 g; 2.23 g; 2.48 g, and 2.67 g] 100 g –1 dry diet)]. The results showed that a lysine-added diet with the dose of 2.23 % 100 g –1 dry diet generated the highest values of protein digestibility (ADCp), relative growth rate (RGR), and fish body composition compared to other treatments. The optimal dose of lysine in feed for protein digestibility and relative growth rate of river catfish juveniles were 2.22 % to 2.24 % dry diet. [ABSTRACT FROM AUTHOR]

The availability of good feeding on fish performance is needed to improve the poor aquaculture condition. The study examines the effects of Saccharomyces cerevisiae supplementation on the growth, survival rate, and blood profile of saline red tilapia in the semi-intensive culture. Sixty saline red tilapia (4.58 ± 0.09 g) were divided into five groups and received standard feed with supplementation of S. cerevisiae at different doses: (A-E) 0, 5, 10, 15, and 20 g/kg feed. S. cerevisiae was sprayed onto the feed and given to fish three times/day for 49 days. The efficiency of feed utilization (EFU), feed conversion ratio (FCR), the protein efficiency ratio (PER), relative growth rate (RGR), survival rate (SR), and blood profiles were examined. The water quality parameters were also evaluated, including temperature, pH, dissolved oxygen, NH3, and salinity. Data were analyzed using ANOVA followed by the Duncan test. The supplementation of 10 g/kg S. cerevisiae could significantly (p<0.05) increase EFU (85.13%), PER (3.76), RGR (4.53%), and survival rate (97.53%), and decrease FCR (1.42) of the saline red tilapia. All doses of S. cerevisiae significantly (p<0.05) increased the number of hematocytes (34.68, 35.96, 34.14, and 34.52%, respectively) and hemoglobin (12.98, 13.58, 12.73, and 12.67%, respectively) of fish. The highest number of erythrocytes and leucocytes was found in dose 10 g/kg feed. All water parameters were stable during the study. Therefore, S. cerevisiae can be used as a feed supplement for red tilapia fish to increase the growth, survival rate, and blood profile of the saline red tilapia. [ABSTRACT FROM AUTHOR]

This study was conducted to evaluate the effect of adding phytase enzyme in diet on growth performance, nutrient digestibility, and survival rate in fingerlings of P. hypothalamus. Fingerlings of P. hypothalamus with the average weight 1.81 ± 0.06 g per fingerling, used in this study were obtained from Muntilan, Central Java. An experimental randomised complete design was used with 5 treatments and 3 repetitions. The treatments were A (0 FTU kg-1 diet, B (150 FTU kg-1 diet), C (300 FTU kg-1 diet), D (450 FTU kg-1 diet), and E (600 FTU kg-1 diet). The parameters to be determined include specific growth rate (SGR), efficiency of feed utilisation (EFU), protein efficiency ratio (PER), apparent digestibility coefficient protein (ADCP ), apparent digestibility coefficient phosphor (ADCF ), survival rate (SR) and water quality parameters. The experimental results significantly (P<0.01) affected SGR, EFU, PER, ADCP and ADCF. On the other hand, the had insignificant (P>0.05) effect on SR of P. hypothalamus fingerlings. Based on the results, it is concluded that optimum doses of phytase enzyme in terms of SGR, EFU, PER, ADCP and ADCF in the catfish (P. hypothalamus) are 324, 314, 300, 300 and 300 FTU kg-1 diet respectively. [ABSTRACT FROM AUTHOR]