Crocea's loose color???
- Thread starter EnderG60
- Start date
OK, so maybe it would have been better to say clams are not limited to 14 or 20k light wavelengths in the wild.
What proof do you have that the zoos that favor 20k lighting are lighter in color than those at 14k ?
I am in my senior year at Tatnall and they nick pick everything
What proof do you have that the zoos that favor 20k lighting are lighter in color than those at 14k ?
I am in my senior year at Tatnall and they nick pick everything
i don't think you understood what i was saying with all of that.
first zoox (zooxanthellae) are all brown (AFIK).
lets go back to light. full spectrum light is just that, full. meaning it contains all the parts of the spectrum. when we talk about lighting for our tanks we use K ratings given by the bulb manufactures. these ratings are not very accurate when compared to the true Kelvin= black body scale.
http://en.wikipedia.org/wiki/Color_temperature
if you look at some of the spectral plots posted earlier (of 14 and 20k) you will see that there are very sharp spikes, particularly in the blue range. in nature when light penetrates water, the wave lengths will be filtered out gradually from red first down to blue. the higher the K rating the bluer the light. at the surface of the ocean on the equator(clear day) the K rating would be around 5000k. that doesnt mean there is less blue, but that all of the wave length are represented (about) equal. so the deeper you go( in the water) the bluer the light will get because the red's, yellows and greens will slowly be filtered out.
according to Thurman & Webber 1984, light transmits through water something like this.
full spectrum light(all visible light) down to about 10m.
at 15m about half of the red is gone and violet (the other end of the spectrum)starts to be filtered out.
around 50m the red is gone.
around 100m the orange is gone, along with most of the violet.
around 175m yellow is gone
there measurements stop about 250m, blue and blue green are all that's left.
now going back and looking at some of the spectral plots of the 14k and 20k bulbs posted earlier.
from these plots we can see that these bulbs don't accurately represent how light is filtered out of seawater(no bulbs do and no bulbs can replicate the sun). what you getting from these higher K bulbs is a ton of blue light, more like you would find in very deep depth.
Yes, the intensity level of these blue bulbs will be higher then you will find from the sun at 100m or 150m but missing a lot of other light.
how about where clams live?( Fatherree 06)
these are maximum depths.
T.Crocea, about 6m
H. Hippopus, about 6m
H. Porcellanus, about 6m
T. Maxima, about 15m
T. Squamosa, about 15m
T. Gigas, about 20m
T. Derasa, about 25m
so why do they live so close to the surface (in full spectrum light)when blue light is readily abundant much deeper? after all clams house 10x the zoox per sq" of suffice area compared to an acro. with all those zoox they should be able to handle those deeper depth.
can clams live under these bluer (artificial) lights? yes, people do it all the time.
are these bluer lights the best for them? IMO, no. but there have been no studies that i can find that say either way.(if anyone has one please post it
)have i seen more people have problems with browning, color loss and slowed growth that use these bluer lights then people with full spectrum lights? Yes
"so why do they live so close to the surface (in full spectrum light)when blue light is readily abundant much deeper? after all clams house 10x the zoox per sq" of suffice area compared to an acro. with all those zoox they should be able to handle those deeper depth."
What a totally ridiculous argument. The biological structures and requirements of a clam are so different than an acro.
What a totally ridiculous argument. The biological structures and requirements of a clam are so different than an acro.
