طراحي و ساخت دستگاه رقم بند دستي مناسب براي ماهي قزل آلا با درنظر گرفتن معيارهاي تاثيرگذار در افزايش بازده آن

Design and constructing a modified and high efficiency manual trout grader

The manual sorter is appropriate for using in all of farms around the world. It has been used at least 3 times along rearing period. Its simple structure made it easy to construct in farms. Many of these constructed sorters have some applied problems such as heavy weight, low accuracy and high mortality. This research was conducted to construct an appropriate sorter without these malfunctions. 4 manual sorters with variable characteristics in frame, Tubs and table was made and tested in 3 replicates for assessing accuracy, broken opercula, mortality, and sorter weight, using with bench and saving working human power. Results showed that for constructing a sorter frame, PVC was more appropriate than wood, aluminum and fiber glass. Using tubes with 30 mm in diameter showed more significant variation (p<0.05). Fixed tubs were more accurate than wheeling tubs and aluminum tubs was more appropriate than PVC tubs. Using bench with a sink can support sorter frame and decreased human work power from 2 people to 1.