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INSTRUMENTATION FOR AQUACULTURE


Several prototype units of the Aquascanner catfish sonar have been built and parts have been assembled to build several more. The units are being tested at select ponds at the ARS-NWAC facility in Stoneville, MS and several commercial ponds in the MS delta. The units are providing good qualitative displays of the ponds and large scale data collection is providing the necessary data to refine and improve an empirical model to correlate the acoustic data to population data. The population data is being collected from stocking records and seining records where available. The inclusion of wireless Ethernet has greatly improved the portability and ease of use of the system as bulky cables to shore for power and data transfer are no longer required. The unit fits easily into the back of a truck and can be deployed and operated by a two man crew with deployment and scan times of approximately 30 minutes per pond. Measurements indicate that meteorological effects, including heavy sun loading and windy conditions affect the measurements and quality of data. The former condition causes refraction or bending of the sound rays in the water which reduces the range of the unit and alters the strength of returning echoes. Work is underway to license and commercialize the technology to transition it to the end.