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  2. Fishfinder - Wikipedia

    en.wikipedia.org/wiki/Fishfinder

    When the fish swims directly under the transducer, it is closer to the boat so the stronger signal shows a thicker line. As the fish swims away from the transducer, the distance increases, which shows as progressively deeper pixels. The image to the right shows a school of white bass aggressively feeding on a school of threadfin shad. Note the ...

  3. Fisheries acoustics - Wikipedia

    en.wikipedia.org/wiki/Fisheries_acoustics

    Biomass estimation is a method of detecting and quantifying fish and other marine organisms using sonar technology. [1] An acoustic transducer emits a brief, focused pulse of sound into the water. If the sound encounters objects that are of different density than the surrounding medium, such as fish, they reflect some sound back toward the source.

  4. Underwater acoustic positioning system - Wikipedia

    en.wikipedia.org/wiki/Underwater_acoustic...

    That information helps the department improve the accuracy of their fish stock assessments in the Sacramento River Delta. Figure 4: NetTrack is an example of a special-purpose underwater acoustic positioning system of the SBL type, designed to measure the opening geometry and area of a trawl net for accurate fish stock assessment purposes.

  5. Deeper Fishfinder - Wikipedia

    en.wikipedia.org/wiki/Deeper_Fishfinder

    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.

  6. Underwater acoustics - Wikipedia

    en.wikipedia.org/wiki/Underwater_acoustics

    Output of a computer model of underwater acoustic propagation in a simplified ocean environment. A seafloor map produced by multibeam sonar. Underwater acoustics (also known as hydroacoustics) is the study of the propagation of sound in water and the interaction of the mechanical waves that constitute sound with the water, its contents and its boundaries.

  7. Fish finder - Wikipedia

    en.wikipedia.org/wiki/Fish_finder

    Fish finder may refer to: Fishfinder , a sonar device attached to a boat, used to measure the amount of fish at various depths underneath the boat Fish identifier, an identification key used in fishing to identify the species of a caught fish

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