Optimization of operating parameters of a drum-type feed metering unit developed for a human-powered floating fish feeder

Abstract

AbstractFeed wastage is one of the major concerns in aquaculture practice. A simple and unique floating fish feeder with drum-type metering mechanism was developed, which addresses this concern. A drum-type metering mechanism is an easy, effective, low cost metering method with low energy requirement. Optimizing the feed rate for any metering systems is a necessary pre-requisite to ensure proper feeding. In this study, the operating parameters of the drum-type feed metering unit have been optimized to achieve the desired feed rate. The influence of three independent parameters (number of metering holes, shaft speed and drum fill level) on the dependent parameter (feed rate) was studied and optimized using response surface methodology. A multilevel full factorial design approach has been adopted for the experimental design. The effect of variation in operating parameters was investigated experimentally and a response surface model was developed from experimental data. The fit of the model was expressed by an R2 value of 0.879. The optimal solutions obtained from the model with high desirability values were further used for validation experiments in aquaculture pond and found to be acceptable. It was observed that low shaft speeds and drum fill levels led to better feeding. The best settings recommended for the feeder operation were 24 metering holes, 31 % drum fill level and 30 rpm shaft speed. The feeder was found to improve feed application and reduce feed wastage. This kind of low-cost feeding systems is expected to encourage adoption of mechanized feeding among small and marginal farmers.