Fish Grading/Sorting for Aquaculture Using Ultrasound Techniques

This Phase I project is aimed at the development of a new automatic device (the UltraGraderTM) for size sorting hatchery raised fish. This project provides a system which will efficiently sort and count fish with minimum manual labor without harm to the fish. One novel aspect is the ability to sort and count fish by length or weight by using both photoelectric and ultrasonic sensors. The unique fish handling system will separate fish from each other and guide them through the sensor section. The information from the sensors will measure the fishes' length and width. From this data, the weight of the fish is deduced. The initial program is a feasibility study of the variables involved in fish handling, size detection and weight prediction. The program will begin by working with minnows as durable substitutes for trout of fingerling sizes. Phase I efforts: 1) develop fish separator and diverter technology; 2) develop and incorporate the photoelectric system; 3) adapt existing ultrasound methods to fish width detection; 4) integate the system elements into a computer controlled prototype unit; 5) examine techniques required to cause fish to enter the grader system; 6) perform field trials on the system to gather operational data.