When I was at the petstore the other day picking up a new heat bulb for the crabs and aquarium heater for the reef, I also picked up some calcium powder with vitamin d added in.
We know our crabs need calcium to grow their exoskeletons, but what I got to thinking about was the relationship calcium has with vitamin d.
In mammals, vitamin d is needed for the proper absorption of calcium (which is primarily used in our bones). A lack of vitamin d can lead to complications as we are not able to absorb enough calcium without it.
Even reptiles need vitamin d in order to thrive.
Now, vitamin d can be given to our crabs with the proper use of a uvb bulb, but what I'm really wondering is: 1) is vitamin d essential to the health of our crabs 2) if it is, how much?
As you can imagine, there is plenty of research on the relationship between calcium and vitamin d for humans and reptile, but that research is basically non-existent for hermit crabs.
When my UVB bulb was working (bulb blew out, haven't replaced it yet), I did notice a lot more activity in my tank. I don't think I had it long enough to really note any other differences.
I was just wondering about your guys' thoughts on vitamin d for our crabs. I picked up a powder that I plan on dusting some of their dry food with once a week for a while to see if I really notice any difference, but it'd be good to have everyone's opinion on it.
When I was running my UV light I think they were more active. In the summer months when sun comes in window from different angle I didn't need it, but thinking that during the fall and winter I may go back to useing mine. As far as Vit. D added to the calcium I would have to go through the foods I feed and see how many have D in them and how well my crabs like those foods before I would buy something with it added in, however that is something that we should all think of....do we offer enough by food or UV or do we need to add it another way .
Post by Sach-Crabministrator on Dec 4, 2012 15:55:07 GMT -5
Well, this certainly got me thinking. I don't worry as much about particular vitamins just for the simple fact that they always have HCP minerals & I give them such a big variety of foods. But yeah, they probably do need Vitamin D. I can't say one way or the other as to which source is best. My PPs are near a window but that window now has 2 layers of plastic. The lights I have on there now are "daylight" bulbs, that I think are for reptiles cuz they don't put out heat; just light and that tank is super active, but I don't know if that's just because I have such a span of sizes. I have the zoomed blue bulb (red too) on the exotics' tank & it only does UVA and they are active too.
Because I was unsure on which was which & what affect they had, I just went researching I already knew that we have to have Vitamin D to help absorb calcium, but here's what I didn't know. The sunlight doesn't give us Vitamin D, it produces a reaction in our skin that makes us MAKE the vitamin D. Also, both UVA & UVB are in sunlight, but the A rays are longer than the B rays and so there is much more UVA in sunlight than UVB. Now, that being said, in the wild, hermies aren't out very much in the daytime & apparently very little of either UVA or UVB is in the moonlight that is reflected sunlight because the atmosphere burns most of it off when it's night time. So, now I'm starting to think that if D is important to the crabs, than in the wild they'd be getting it from their food more than sunlight so.....who knows, LMSO.
At least I learned something today at any rate,hh.
≈19 clypeatus, 4 perlatus & 8 compressus in 4 tanks
I thought about pp's and being out mostly at night also Sach, then I remember the migration videos and others I've seen and they do come out some in the day....so maybe they come out for short periods of sun? Maybe someday they will have an answer, in the mean time I'll focus on a good diet for them and use the UV when I can (:
I may have to get a UVB bulb and see if I notice any difference in my dual hood. My guys are always up and about all day long and they love being under the lights (well some of them do it) and see if there's any difference.
Aren't straws more beachy than pps? The way I picture is is crabs who live closer to beach areas probably get more actual sunlight then the ones who live in more woodsy areas.
They really aren't that expensive - you just have to set them up right. Like, if you have glass between the bulb and the tank - the glass filters out virtually all of the rays that you buy the bulbs for. Any kind of barrier will filter out the rays to some extent, but glass is the worst.
Post by Sach-Crabministrator on Dec 5, 2012 19:25:24 GMT -5
Is that only the UVB that has trouble getting through glass because I was reading yesterday that the UVA definitely goes through glass & that's why some people who are "city people" still get skin damage on their hands from having them on the steering wheel & the UVA going through the windshield.
≈19 clypeatus, 4 perlatus & 8 compressus in 4 tanks
Yeah I just checked mine, it's UVB ): I have the Repti Glo 2.0 Don't really want to run the wire under the glass top I have, so will have to see about getting a UVA bulb. on the side of the box it of course is referring to reptiles but it says "stimulates appetite, activity, and reproductive behaviour through UVA radiation" So going to have to look into this light thing some more.
Still finding mixed reviews....so much on reptiles, but so little known on crabs ): Going to keep this thread going if I can and we will see if over the next year we can develop a crabby way of doing things and seeing if it works.....on line to use a UVA light it would still have to be put in the tat.....so just not sure as I don't want it inside with the way crabs crawl on everything.
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