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  2. Fisheries acoustics - Wikipedia

    en.wikipedia.org/wiki/Fisheries_acoustics

    Fisheries acoustic research is conducted from a variety of platforms. The most common is a traditional research vessel, with the echosounders mounted on the ship's hull or in a drop keel. If the vessel does not have permanently installed echosounders, they may be deployed on a pole mount attached to the ship's side, or on a towed body or ...

  3. Echo sounding - Wikipedia

    en.wikipedia.org/wiki/Echo_sounding

    The speed of sound will vary slightly depending on temperature, pressure and salinity; and for precise applications of echosounding, such as hydrography, the speed of sound must also be measured, typically by deploying a sound velocity probe in the water. Echo sounding is a special purpose application of sonar used to locate the bottom.

  4. Acoustic tag - Wikipedia

    en.wikipedia.org/wiki/Acoustic_tag

    Acoustic tags are small sound-emitting devices that allow the detection and/or remote tracking of organisms in aquatic ecosystems. Acoustic tags are commonly used to monitor the behavior of fish. Acoustic tags are commonly used to monitor the behavior of fish.

  5. Sonar - Wikipedia

    en.wikipedia.org/wiki/Sonar

    However, acoustic technology has been one of the most important driving forces behind the development of the modern commercial fisheries. Sound waves travel differently through fish than through water because a fish's air-filled swim bladder has a different density than seawater. This density difference allows the detection of schools of fish ...

  6. Glossary of fishery terms - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_fishery_terms

    Bioacoustics – in underwater acoustics and fisheries acoustics this term is used to mean the effect of plants and animals on sound propagated underwater, usually in reference to the use of sonar technology for biomass estimation; Bimodal – a bimodal distribution is a distribution with two different modes which appear as distinct peaks. An ...

  7. Acoustic survey in fishing - Wikipedia

    en.wikipedia.org/wiki/Acoustic_survey_in_fishing

    Acoustic survey in fishing is one of the research methods that can detect the abundance of target species using acoustic detectors. For example, many pelagic fisheries are generally very scattered over a broad ocean and difficult to detect. Hence survey vessel with acoustic detector emits sound waves to estimate the density of plankton and fish ...

  8. 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 ...

  9. Acoustic harassment device - Wikipedia

    en.wikipedia.org/wiki/Acoustic_harassment_device

    The devices have also been employed to keep marine mammals away from fishing nets. [2] The devices are known as acoustic harassment devices (AHDs) and acoustic deterrent devices, which are smaller AHDs [3] or intended as an awareness tool to warn species to the presence of danger rather than as a tool of harassment at a much louder level. [4]