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Results 1 to 2 of 2

Thread: Articles?

  1. Default Articles?


    0 Not allowed!
    Does anyone know a link to an article on major causes of fish stress?
    Lighting in particular?If it has a category that is.

  2. Default


    0 Not allowed!
    Quote Originally Posted by toysrus
    Does anyone know a link to an article on major causes of fish stress?
    Lighting in particular?If it has a category that is.

    Heres a decent one:

    http://www.peteducation.com/article....+2160&aid=2476

    Here is an awesome PDF you can download:
    http://aquaneering.com/pdf_files/aln...cle_redleg.pdf

    Excerpt on lighting:
    Lighting, Turbidity, and Visual Stimuli
    Many aquatic species, fish in particular, are affected by sudden changes in light and by
    photoperiods. One facility, upon the installation of a 24-hour camera monitoring system,
    inadvertently discovered their perch were traumatized when the overhead lights automatically
    background image
    clicked on or off. The fish would throw themselves violently around the tank in a wave of panic.
    This stress was easily eliminated with the installation of a gradual, light-dimming system. The
    lights came on and off slowly, replicating the natural effect of dawn and dusk.
    Growth and reproduction cycles are also interdependent on light cycles in many aquatic species.
    Animals housed under incorrect intensities or durations may develop either acute or chronic
    problems in these areas.
    Turbidity, the index of light absorption, is created by the amount of both particulate matter and
    dissolved solids in the water. It is not necessarily an indication of poor water quality. Some
    species, such as Xenopus, carp, catfish and tilapia, prefer a fair amount of turbidity. Others, like
    salmonids, prefer much clearer water.
    Some species are from environments with crevices, sand, or plant materials which are used to
    conceal themselves. Xenopus laevis, crayfish, lobsters, clown fish, squid, and horseshoe crabs
    are a few examples of species that prefer to hide. Bright, clear tanks with no concealment options
    can be distressing. Just entering a room can send various species scrambling for cover,
    occasionally injuring themselves or others in the process. While some animals will eventually
    acclimate to visual stimuli, it is best to provide appropriate substrates and containers in which the
    animals can hide.
    Turbulence
    Excess water movement can be a stress for some species. Xenopus leavis, for example, are
    naturally found in very still, murky African deltas. An adult has approximately 180 lateral line
    organs distributed over its head, neck and trunk which detect the friction of the water movement.8
    This can be indicative of the frog's next meal (an insect's flutter on the water's surface, the wiggle
    of a small fish) or it can alert the Xenopus to danger (the motion of a predator about to strike).
    Xenopus will often face the current to remain vigilant. I have often heard people confuse this with
    the animal "enjoying a water massage." Water movement is naturally a cause to react. Being on a
    constant "state of alert" is a stress, not a day at the spa.
    For other species, lack of water movement is a stress. Sea urchins, oysters, mussels, starfish,
    and most marine invertebrates rely on powerful currents to bring food to and carry waste away
    from them. Some fish (salmon, trout, etc.) also prefer a higher current, as would be found in the
    swifter moving waters from which they originate.
    Last edited by tanks4thememories; 03-04-2010 at 02:35 AM.
    “Let the future tell the truth, and evaluate each one according to his work and accomplishments. The present is theirs; the future, for which I have really worked, is mine.” - Nikola Tesla

    "GoT FiSh?"

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