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NRAC# 221

Fish Counting in Situ - A Technology Assessment

John E. Huguenin


Opening Paragraph:
The accurate counting and measurement of fish in situ, without having to individually handle and stress the fish, has become a critical need in fish farming. Data on numbers and sizes are essential input information for financing, insurance, stock-management and feeding activities. Since 40-60% of total production costs in a variety of commercial aquiculture ventures often involve feeding, these data are essential to minimize feed wastage and increase the efficiency and economics of feed management. In salmon cage culture as an example, feed wastage has been measured to be in the order of 1/3 the total feed provided (Juell, 1991) . More recent unpublished data indicates that feed wastage in Scandinavian commercial cage systems has been considerably reduced.
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