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In 1948 they introduced their fishfinder for use in commercial fishing vessels; the Furuno Fish Finder is the world's first practical fishfinder. [ 5 ] [ 6 ] The first fishfinder marketed to consumers in America for recreational fishing was the Lowrance Fish Lo-K-Tor (also nicknamed "The Little Green Box"), which was invented in 1957 and ...
Echo sounding or depth sounding is the use of sonar for ranging, normally to determine the depth of water . It involves transmitting acoustic waves into water and recording the time interval between emission and return of a pulse; the resulting time of flight , along with knowledge of the speed of sound in water, allows determining the distance ...
African fish eagles usually catch fish around 200 to 1,000 g (0.44 to 2.20 lb), but fish up to 4,200 g (9.3 lb) can be taken. If it catches a fish too heavy to allow the eagle to sustain flight, it will drop into the water and paddle to the nearest shore with its wings. [ 15 ]
A depth finder may refer to any of the following: Sonar: use of underwater sound propagation to measure depth; Fathometer or fishfinder: a device to locate fish at various water depths; Echo sounding: a technique using sound pulses to measure depth; sounding line: a length of rope used to measure water depth
ADCPs with three beams resolve the three components of velocity. (Models Aquadopp Profiler 1MHz and 0.6 MHz, Nortek) Head of an ADCP with four transducers (Model WH-600, RD Instruments) ADCPs contain piezoelectric transducers to transmit and receive sound signals. The traveling time of sound waves gives an estimate of the distance.
A transducer array mounted in a streamlined housing (known as the "fish" or "towfish") can be towed behind a vessel at a desired depth to provide suitable resolution. The image is recorded and the position of the fish relative to the vessel correlated with positional input from the vessel, usually from GPS.
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