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  2. Fisheries acoustics - Wikipedia

    en.wikipedia.org/wiki/Fisheries_acoustics

    Fisheries acoustics includes a range of research and practical application topics using acoustical devices as sensors in aquatic environments. Acoustical techniques can be applied to sensing aquatic animals , zooplankton , and physical and biological habitat characteristics.

  3. Acoustic survey in fishing - Wikipedia

    en.wikipedia.org/wiki/Acoustic_survey_in_fishing

    Hence survey vessel with acoustic detector emits sound waves to estimate the density of plankton and fish shoal. Generally, the transducer is put under water, which is linked to an echo sounder in the vessel which records the shoals of fish as "marks" on a screen or paper trace. Then the density and number of marks are converted into biomass.

  4. Acoustic tag - Wikipedia

    en.wikipedia.org/wiki/Acoustic_tag

    In fish, tags are frequently embedded into the individual by cutting a small incision in the abdominal cavity of the fish (surgical implantation), or put down the gullet to embed the Acoustic Tag in the stomach (gastric implantation) [citation needed]. External attachment using adhesive compounds is typically not used for fish as scale fluids ...

  5. Uncrewed vessel is surveying Lake Erie for the first time ...

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  6. Fishing in the Central Valley: California Collaborative ...

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  7. 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]

  8. Underwater acoustic positioning system - Wikipedia

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

    An early use of underwater acoustic positioning systems, credited with initiating the modern day development of these systems, [15] involved the loss of the American nuclear submarine USS Thresher on 10 April 1963 in a water depth of 2560m. [16] An acoustic short baseline (SBL) positioning system was installed on the oceanographic vessel USNS ...

  9. List of Disney California Adventure attractions - Wikipedia

    en.wikipedia.org/wiki/List_of_Disney_California...

    (The term "attractions" is used by Disney as a catch-all term for rides, shows, and exhibits.) Disney California Adventure currently has 34 attractions in the theme park. Disney California Adventure began a major US$1.2 billion renovation in 2008 that ended in 2012. Virtually every aspect of the park had some type of work done to it.