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  2. Fishfinder - Wikipedia

    en.wikipedia.org/wiki/Fishfinder

    In 1948 they introduced their fishfinder for use in commercial fishing vessels; the Furuno Fish Finder is the world's first practical fishfinder. [ 5 ] [ 6 ] The first fishfinder marketed to consumers in America for recreational fishing was the Lowrance Fish Lo-K-Tor (also nicknamed "The Little Green Box"), which was invented in 1957 and ...

  3. Aquascope - Wikipedia

    en.wikipedia.org/wiki/Aquascope

    Bathyscope of c.a. 1850. The instrument which has been popularly named the Water, or Marine Telescope, from the power given by its use to see into the water, consists of a tube of metal or wood, of a convenient length, to enable a person looking over the gunnel of a boat to rest the head on the one end, while the other is below the surface of the water; the upper end is so formed, that the ...

  4. Full-spectrum light - Wikipedia

    en.wikipedia.org/wiki/Full-spectrum_light

    Full-spectrum light is light that covers the electromagnetic spectrum from infrared to near-ultraviolet, or all wavelengths that are useful to plant or animal life; in particular, sunlight is considered full spectrum, even though the solar spectral distribution reaching Earth changes with time of day, latitude, and atmospheric conditions.

  5. Far-red light - Wikipedia

    en.wikipedia.org/wiki/Far-red_light

    Far-red light is a range of light at the extreme red end of the visible spectrum, just before infrared light. Usually regarded as the region between 700 and 750 nm wavelength , it is dimly visible to human eyes.

  6. Counter-illumination - Wikipedia

    en.wikipedia.org/wiki/Counter-illumination

    When seen from below by a predator, the animal's light helps to match its brightness and colour to the sea surface above. Counter-illumination is a method of active camouflage seen in marine animals such as firefly squid and midshipman fish, and in military prototypes, producing light to match their backgrounds in both brightness and wavelength.

  7. Fluorometer - Wikipedia

    en.wikipedia.org/wiki/Fluorometer

    Fluorometer designed to measure chlorophyll fluorescence in plants. A fluorometer, fluorimeter or fluormeter is a device used to measure parameters of visible spectrum fluorescence: its intensity and wavelength distribution of emission spectrum after excitation by a certain spectrum of light. [1]

  8. Fishing light attractor - Wikipedia

    en.wikipedia.org/wiki/Fishing_light_attractor

    Fish are most attracted to true-green light colors, and LEDs do the best job of illuminating this color. A fishing light attractor is a fishing aid that uses lights attached to structures above water or suspended underwater to attract fish and members of their food chain. Fish are typically most attracted to true-green light colors.

  9. Underwater vision - Wikipedia

    en.wikipedia.org/wiki/Underwater_vision

    The emitted light and the reflected light combine and may be considerably more visible than the original light. The most visible frequencies are also those most rapidly attenuated in water, so the effect is for greatly increased colour contrast over a short range, until the longer wavelengths are attenuated by the water.