Klahan Rungkan, Krajabthong Kritsana, Maksiri Wanida, Tamruangit Jenjina, Whangchai Niwooti, Pimpimol Tipsukhon, Whangchai Kanda
Faculty of Agricultural Technology, Phetchaburi Rajabhat University, Phetchaburi, 76000 Thailand.
Faculty of Fisheries Technology and Aquatic Resources, Maejo University, Chiang Mai, 50290 Thailand.
Biomass Convers Biorefin. 2023 May 6:1-10. doi: 10.1007/s13399-023-04235-4.
Aquaculture is vital for feeding a growing population as aquatic creatures require more protein. Utilizing protein-rich biomass for feeding animals is a possible solution. Biorefinery technology can extract protein and non-protein components from biomass, creating an economically feasible value chain. This study replaced fish feed with napier grass and used a compensatory response to reduce the cost of feeding Nile tilapia. The trial involved dividing mono-sex male Nile tilapia, initially weighing between 11.10 and 13.60 g/f, into four groups with three replications based on their feeding regime. Therefore, in the study, four groups of Nile tilapia were fed different diets for 90 days. The control group (T1) received a commercial floating pellet diet throughout the trial. Group T2 and T3 received a mix of commercial floating pellet diet and napier grass in varying proportions, and group T4 was fed with only napier grass throughout the trial. The study found that groups T2 and T3 had remarkable fish growth performance, high digestibility of napier grass, and lower feed prices with the highest benefit-cost ratios. The percentage of edible flesh and Hepatosomatic Index (PT2) were higher in group T2 than T3. Cellulase activity decreased with the frequency of napier grass intake, and the amylase activity was higher in T2 than T3, which also had the highest growth performance and feed utilization. Therefore, the study suggests that the optimal feeding regimen for Nile tilapia is T2 or T3, which promotes growth and is cost-effective.
随着水生生物需要更多蛋白质，水产养殖对于养活不断增长的人口至关重要。利用富含蛋白质的生物质来喂养动物是一种可行的解决方案。生物精炼技术可以从生物质中提取蛋白质和非蛋白质成分，创造出经济上可行的价值链。本研究用象草替代鱼饲料，并利用补偿反应来降低尼罗罗非鱼的饲养成本。试验将初始体重在11.10至13.60克/尾之间的单性雄性尼罗罗非鱼，根据其喂养方式分为四组，每组三个重复。因此，在该研究中，四组尼罗罗非鱼被投喂不同的饲料90天。对照组（T1）在整个试验期间接受商业漂浮颗粒饲料。T2组和T3组接受不同比例的商业漂浮颗粒饲料和象草的混合物，T4组在整个试验期间仅投喂象草。研究发现，T2组和T3组具有显著的鱼类生长性能、象草的高消化率、较低的饲料价格以及最高的效益成本比。T2组的可食鱼肉百分比和肝体指数（PT2）高于T3组。纤维素酶活性随着象草摄入频率的降低而下降，T2组的淀粉酶活性高于T3组，T2组还具有最高的生长性能和饲料利用率。因此，该研究表明，尼罗罗非鱼的最佳喂养方案是T2或T3，既能促进生长又具有成本效益。
