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2. Fishfinder - Wikipedia

   en.wikipedia.org/wiki/Fishfinder

   Typical values used by commercial fish finders are 4921 ft/s (1500 m/s) in seawater and 4800 ft/s (1463 m/s) in freshwater. [ citation needed ] The process can be repeated up to 40 times per second and eventually results in the bottom of the ocean being displayed versus time (the fathometer function that eventually spawned the sporting use of ...

3. Fisheries acoustics - Wikipedia

   en.wikipedia.org/wiki/Fisheries_acoustics

   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.

4. Side-scan sonar - Wikipedia

   en.wikipedia.org/wiki/Side-scan_sonar

   Side-scan data are frequently acquired along with bathymetric soundings and sub-bottom profiler data, thus providing a glimpse of the shallow structure of the seabed. Side-scan sonar is also used for fisheries research, dredging operations and environmental studies. It also has military applications including mine detection.

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. Towed pinger locator - Wikipedia

   en.wikipedia.org/wiki/Towed_pinger_locator

   The locator is mounted in a hydrodynamic shell, or "tow fish", connected by winch behind a surface vessel across the search area. The locator listens for the sound emanating from the beacon or "pinger". Once located, the beacon and its attached recorders can be retrieved by divers, submersibles or remotely operated vehicle (ROV), depending on ...

7. Marine mammals and sonar - Wikipedia

   en.wikipedia.org/wiki/Marine_mammals_and_sonar

   [2] [23] Blue whales have also been shown to flee from the source of mid-frequency sonar, [24] while naval use of mid- and high- frequency side-scan sonar was deemed "the most probable cause" of a mass stranding of around 50 short-beaked common dolphin (Delphinus delphis) on 9 June 2008 in Falmouth Bay, Cornwall, UK. [25]