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A fishfinder or sounder (Australia) is a sonar instrument used on boats to identify aquatic animals, underwater topography and other objects by detecting reflected pulses of sound energy, usually during fishing activities. A modern fishfinder displays measurements of reflected sound on a graphical display, allowing an operator to interpret ...
White-bellied sea eagle. Icthyophaga leucogaster (Gmelin, JF, 1788) India and Sri Lanka through Southeast Asia to Australia: Size: Habitat: Diet: LC Sanford's sea eagle. Icthyophaga sanfordi (Mayr, 1935) Size: Habitat: Diet: VU African fish eagle. Icthyophaga vocifer (Daudin, 1800) Sub-Saharan Africa: Size: Habitat: Diet: LC Madagascar fish eagle
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 ]
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Target strength (TS) is a measurement of how well a fish, zooplankter, or other target scatters sound back towards the transducer. In general, larger animals have larger target strengths, though other factors, such as the presence or absence of a gas-filled swimbladder in fishes, may have a much larger effect.
Operation of Deeper is based on echolocation and wi-fi technologies. Echolocation is a method for detecting and locating objects submerged in water. When a sound signal is produced, the time it takes for the signal to reach an object and for its echo to return is issued to calculate the distance between the sonar and the object.
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