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Search: Posts Made By: ATJ
Forum: SPS Keepers 09/19/2007, 04:36 PM
Replies: 271
Views: 45,013
Posted By ATJ
In my opinion, yes. Photoinhibition has been...

In my opinion, yes. Photoinhibition has been demonstrated in shallow water corals, even at higher latitudes. The zooxanthellae don't photosynthesize during the middle of the day when light is at...
Forum: Advanced Topics 06/08/2007, 06:37 PM
Replies: 44
Views: 3,079
Posted By ATJ
This is true for ALL wild caught fish, regardless...

This is true for ALL wild caught fish, regardless of the species. The key to the success for any fish (or invertebrate) is finding suitable substitutes for their natural food as their natural food...
Forum: Advanced Topics 06/08/2007, 06:27 PM
Replies: 44
Views: 3,079
Posted By ATJ
Paul, You are correct in suggesting that it...

Paul,

You are correct in suggesting that it is unwise to make conclusions from only a few observations. Any observations are good and valuable, but you need a huge number to be statistically...
Forum: Advanced Topics 06/02/2007, 07:04 PM
Replies: 44
Views: 3,079
Posted By ATJ
I'm just back from a week's diving on the Great...

I'm just back from a week's diving on the Great Barrier Reef and the Coral Sea and made some careful observations of moorish idols while I was diving.

I saw them at all depths from near the...
Forum: Andrew Trevor-Jones 06/02/2007, 06:45 PM
Replies: 12
Views: 4,446
Posted By ATJ
tlmack, I use mysids all the time and find...

tlmack,

I use mysids all the time and find they do get consumed but I get reactions like those in the article.

If your corals haven't eaten for a while they may be lacking some energy and their...
Forum: Andrew Trevor-Jones 05/25/2007, 04:26 PM
Replies: 12
Views: 4,446
Posted By ATJ
Ladipyg, I specifically tried the "food...

Ladipyg,

I specifically tried the "food juice" method with Tubastraea and Lobophyllia and saw no reaction to the "juice" in the water. My other tanks with fish effectively get "food juice" on a...
Forum: Advanced Topics 05/24/2007, 06:17 PM
Replies: 39
Views: 3,257
Posted By ATJ
Light is made up of photons. Each photon has a...

Light is made up of photons. Each photon has a single wavelength. The wavelengths of photons in visible light range from 400 to 700 nm. A photon of one wavelength is identical to every other...
Forum: Advanced Topics 05/18/2007, 04:43 PM
Replies: 1
Views: 288
Posted By ATJ
I'm very surprised that Bill wasn't able to help...

I'm very surprised that Bill wasn't able to help you. When did you ask? I know Bill was away for a while.
Forum: Advanced Topics 05/16/2007, 04:52 PM
Replies: 8
Views: 529
Posted By ATJ
I don't believe you would have massive problems...

I don't believe you would have massive problems with algae by leaving the lights on. Assuming you were going to have massive algae problems, wouldn't you still have those same problems when you...
Forum: Advanced Topics 05/15/2007, 07:23 PM
Replies: 39
Views: 3,257
Posted By ATJ
Well, yes, there are, but as already indicated...

Well, yes, there are, but as already indicated there aren't many such pigments. In the long list provided by Riddle, only 6 pigments are identified as having excitation peaks of less than 400 nm. ...
Forum: Advanced Topics 05/13/2007, 06:33 PM
Replies: 39
Views: 3,257
Posted By ATJ
I am not aware of any research into fluorescence...

I am not aware of any research into fluorescence being an attractant for prey. It seems an unlikely proposition.

When there is twilight or moonlight and fluorescence is going to be far less...
Forum: Advanced Topics 05/13/2007, 06:17 AM
Replies: 39
Views: 3,257
Posted By ATJ
Luke, First of all, the fact that you can...

Luke,

First of all, the fact that you can "observe" anything under the blacklight suggests that it also includes visible light as human eyes are not sensitive to UVR. How do you know whether the...
Forum: Advanced Topics 05/12/2007, 07:54 PM
Replies: 39
Views: 3,257
Posted By ATJ
I'm not aware of any benefits of UV radiation to...

I'm not aware of any benefits of UV radiation to marine organisms. There may be some sterilisation benefits but that's going to be about it. UVR can't be used (directly) for photosynthesis as it is...
Forum: Advanced Topics 05/10/2007, 04:46 PM
Replies: 44
Views: 3,079
Posted By ATJ
And we get them in Sydney each Summer. They come...

And we get them in Sydney each Summer. They come down as juveniles on the EAC live here for a few months and then die. Should we not take these ones, too?
Forum: Advanced Topics 05/10/2007, 04:10 PM
Replies: 9
Views: 502
Posted By ATJ
With some obvious exceptions, identification of...

With some obvious exceptions, identification of invertebrates from photographs alone is generally difficult. The accuracy of the identification will vary between taxonomic groups but with sea stars...
Forum: Advanced Topics 05/10/2007, 02:44 AM
Replies: 9
Views: 502
Posted By ATJ
I still recommend you keep a close eye on them -...

I still recommend you keep a close eye on them - especially at night.
Forum: Advanced Topics 05/09/2007, 09:53 PM
Replies: 18
Views: 850
Posted By ATJ
I don't know about that research, but I can...

I don't know about that research, but I can demonstrate that 4 hours per day of metal halide lighting alone will not be enough to sustain a coral long term.

Chalker et al. (1983) published some...
Forum: Andrew Trevor-Jones 05/09/2007, 05:11 PM
Replies: 12
Views: 4,446
Posted By ATJ
I target feed my corals with larger polyps, much...

I target feed my corals with larger polyps, much like in the time lapse sequences. I generally do this with the powerheads off and after lights out (the latter more to stop fish from stealing the...
Forum: Advanced Topics 05/09/2007, 04:56 PM
Replies: 12
Views: 635
Posted By ATJ
From Shimek's article: The problem you...

From Shimek's article:


The problem you have here is determining what species you have. Do you have the relatively benign "obligatory carrion-feeding scavengers"? Do you have scavengers that...
Forum: Advanced Topics 05/08/2007, 06:44 AM
Replies: 12
Views: 635
Posted By ATJ
http://reefkeeping.com/issues/2002-05/rs/index.php

http://reefkeeping.com/issues/2002-05/rs/index.php
Forum: Advanced Topics 05/07/2007, 10:03 PM
Replies: 9
Views: 502
Posted By ATJ
Could be either. Some species feed on corals. ...

Could be either. Some species feed on corals. Most are carnivores. Just keep a close watch on them for now.
Forum: Advanced Topics 05/07/2007, 05:26 AM
Replies: 8
Views: 759
Posted By ATJ
Corals don't have brains and so can't be trained...

Corals don't have brains and so can't be trained to do anything, as such. They do have a preprogramed reaction to stimuli which you can use to your advantage.

For Tubastraea (and many other...
Forum: Andrew Trevor-Jones 05/06/2007, 07:03 PM
Replies: 12
Views: 4,446
Posted By ATJ
Thanks for the idea. I might try that. I often...

Thanks for the idea. I might try that. I often do something similar by placing a small amount of food on the coral first which prompts it to expand and then I feed the rest of the food.

Do you...
Forum: Advanced Topics 05/06/2007, 06:18 PM
Replies: 9
Views: 502
Posted By ATJ
They are sea stars, probably of the genus...

They are sea stars, probably of the genus Patiriella. Looks like they have been reproducing asexually and haven't quite grown all their arms.
Forum: Advanced Topics 05/04/2007, 08:28 PM
Replies: 18
Views: 850
Posted By ATJ
But it is the light before and after saturation...

But it is the light before and after saturation that they are using most. While people do get away with short duration for metal halide light it is only because the supplemental lighting is...
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