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Acoustic surveys of stocks of small pelagic fish, in particular the Peruvian anchovy or anchoveta (Engraulis ringens), have been carried out off the coast of Peru since the late 1970s. In all, 51 of these have been carefully archived since 1983.
15 de abr. de 2008 · Living resources of the sea and fresh water have long been an important source of food and economic activity. With fish stocks continuing to be over-exploited, there is a clear focus on fisheries...
20 de nov. de 2007 · Scientific echosounders are used to quantify fish over large areas, and acoustic surveys are widely used in fisheries assessments (Simmonds and MacLennan 2005).
2 de ago. de 2005 · Living resources of the sea and fresh water have long been an important source of food and economic activity. With fish stocks continuing to be over-exploited, there is a clear focus on fisheries management, to which acoustic methods can and do make an important contribution.
With fish stocks continuing to be over-exploited, there is a clear focus on fisheries management, to which acoustic methods can and do make an important contribution.
Plate 3.1 Echogram displayed on a colour printer showing low density aggregations of small fish in Oslo Fjord, Norway.Simrad EK500 echosounder,38kHz frequency and 40 log R time-varied-gain.Vertical scale 0–100m depth.Numbers printed on the echogram show (left column) measured target strengths of indi-vidual scatters and (right column) echo ...
With fish stocks continuing to be over-exploited, there is a clear focus on fisheries management, to which acoustic methods can and do make an important contribution.
