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  2. Fishfinder - Wikipedia

    en.wikipedia.org/wiki/Fishfinder

    With the Fish Symbol feature disabled, an angler can learn to distinguish between fish, vegetation, schools of baitfish or forage fish, debris, etc. Fish will usually appear on the screen as an arch. This is because the distance between the fish and the transducer changes as the boat passes over the fish (or the fish swims under the boat).

  3. List of fish species that protect their young - Wikipedia

    en.wikipedia.org/wiki/List_of_fish_species_that...

    Some species gather up fertilized eggs in their mouth and keep them safe until they hatch, a process called mouthbrooding. Cichlid. In addition to being mouthbrooders, some species continue to protect their young after they hatch, calling out to them when there is danger, and letting them swim back into their mouth to hold them safely away. [1]

  4. 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.

  5. List of national fish hatcheries in the United States - Wikipedia

    en.wikipedia.org/wiki/List_of_National_Fish...

    This List of National Fish Hatcheries in the United States includes the 70 National Fish Hatcheries, seven Fish Technology Centers and nine Fish Health Centers that are administered as components of the National Fish Hatchery System by the U.S. Fish and Wildlife Service.

  6. National Fish Hatchery System - Wikipedia

    en.wikipedia.org/wiki/National_Fish_Hatchery_System

    The National Fish Hatchery System (NFHS) was established by the U.S. Congress in 1871 through the creation of a U.S. Commissioner for Fish and Fisheries. [1] This system of fish hatcheries is now administered by the Fisheries Program of the U.S. Fish and Wildlife Service (Service), an agency within the United States Department of the Interior .

  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