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Fish in the dark

Home Forums The Lounge Fish in the dark

This topic contains 0 replies, has 1 voice, and was last updated by  mikev 4 years ago.

Viewing 6 posts - 1 through 6 (of 6 total)
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  • #303067

    BillT
    Participant

    The evening I turned off the lights in my fish room.

    I then went back about 5 minutes later to throw a dead battery into my dead battery bucket.

    I grabbed my LED flashlight and turned on the red light to find my way around without unduly disturbing the fish. (Red light is thought to be least disruptive to circadian rhythms.)

    After tossing the battery I checked out the fish with my red light. To my surprise I found many of my timid Danios that are normally hiding in the plants near the bottom where hanging out at mid water or near the surface.

    I guess they turn off hiding in the dark.

    Anyone know anything about this?

    Anyone tried shooting infrared pictures of fish? Does that work under water?

    #352351

    mikev
    Participant

    I don’t think you mean “infrared” — this would only work if the fish temperature is different from that of the water, and this is not the case.

    #352352

    coelacanth
    Participant

    That would be true if it was restricted to thermal imaging, but there is also active illumination which uses a near-IR source with a suitable camera.

    #352354

    BillT
    Participant

    That would be true if it was restricted to thermal imaging, but there is also active illumination which uses a near-IR source with a suitable camera.

    Here is a link to one for a video camera:

    http://www.bhphotovideo.com/c/product/762228-REG/Sima_SL_100IR_SL_100IR_Infrared_LED_Light.html

     

    Don’t know about ones for still photography.

    #352355

    BillT
    Participant

    Been think about this some more.

    infrared light should go through water well since it is used at times in microscopy because of its good penetration of tissue (mostly water). The glass of plastic of the aquarium may filter out some of the infrared as well as the glass in the lens, but it could probably be made to work with enough illumination.

    Since there are video cameras that can take infrared images, the lenses should not be overly expensive and at least some sensors will work.

    #352356

    mikev
    Participant

    Sorry, my bad. Like this?

    http://www.youtube.com/watch?v=J23IzOt3ezM

    If yes, google for “infrared camera aquarium” and you will find some more

    the £190 kit here

    http://www.nestcameras.co.uk/cameras

    (scroll down) may be what you want?

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