My jellyfish seem to be a little spaced out and derpy

This section is dedicated to keeping Jellyfish in an aquarium. Dr. T is a specialist in marine plankton and he will be happy to help with any of your jellyfish questions.

My jellyfish seem to be a little spaced out and derpy

Postby Santicity » 06 Feb 2014, 20:40

Hey Guys,

So I know Jellyfish are very hard to diagnose especially on an internet forum, but maybe you guys can try to give me some help. I had some problems in the past with the water quality, but I've fixed those problems.

Anyways, my jellyfish seem to be a little spaced out and derpy, for lack of better words. They just kind of float around, all flattened out. They'll pulse for a little while and then just flatten out, and float around. They're still eating, which is a good thing, but I can't figure out what's going on.

The water levels are good (RO/DI water with saltwater that is mixed and settled for at least 24 hours). I've got an airpump in the tank going to maintain pH and the oxygen levels. I'm cleaning leftover food from the tank as well.

One thing I noticed was when I topped off the tank with some freshwater, the jellies seem to all of a sudden pulse for a while, which I guess was a good thing. I thought that maybe the temperature was too high, so I turned off the heater. It probably doesn't help that the people who sold me the jellies (JellyfishArt) advise that I keep the jellies within 60 - 90 degrees F (15 - 32 C) which is a huge range, so I don't know what to do. I'm trying to get an exact temperature from them.

What could be possible causes for jellyfish to flatten out? Too high of a temperature? Too high salinity? Not enough protein/nutrition? Any advice is appreciated!
Santicity
 
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Re: My jellyfish seem to be a little spaced out and derpy

Postby Cubic » 07 Feb 2014, 07:25

Hi Santicity

As you mentioned, unfortunately there are a number of factors that could cause this problem. We will try and go through them a couple at a time and see if we can figure out what the issue is here.

What are you testing your salinity with? If it is a swing hydrometer I recommend you check it against a refractometer. Swing hydrometers will go out of calibration over time and if your salinity is high it could cause the issues you are seeing. Moon jellyfish are quite happy at low salinity (they are often found in estuaries) but they don't deal with high salinity well.

Temperature is another strong possibility. We have a policy not to comment on other companies but I will say, for the sake of your jellies, that the company you sauced them from gets jellyfish from all over the world. We know quite a few of their suppliers and they range from Hawaii to France to Japan. You really need to know where the jellies came from because a jellyfish from Hawaii is going to need completely different temperatures from a jellyfish collected in central or northern Japan! They each have a specific temperature range. I would recommend taking the heater out, I think you will probably be better off with a lower temperature than a higher one until you know where they came from. In future I would recommend ordering from www.pbnjellies.com.

What are you feeding your jellies? There aren't actually that many foods on the market that will keep jellyfish alive long term. We have tested lots of different coral foods and not had great results which is why we have developed our own food specifically for jellies. Unfortunately its not on the market in the US yet. Live baby artemia is your best bet.
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Re: My jellyfish seem to be a little spaced out and derpy

Postby Santicity » 08 Feb 2014, 11:34

With salinity, I think it's around the normal range of 32-34 ppt. I am using a swing hydrometer and it seems to be working fine, but I'll look into getting a refractometer.

I've tried contacting for more information, but unfortunately they haven't responded. The problem is that if these are lower temperature jellies, the jellies from PBnJellies are 70 F while the ones I currently have might be 60 F.

I'm feeding my jellies the food that came from jellyfish art. I want to buy your food! When will you have it available in the US? Perhaps partner with PBnJellies some more!

After taking out the heater, I'm running into the problem where my jellies are constantly getting stuck to the side of the tank. They seem to be more active, but now they keep getting sucked up!
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Re: My jellyfish seem to be a little spaced out and derpy

Postby Cubic » 09 Feb 2014, 08:40

I think you are feeding frozen copepods is that correct? We did a trial with this food and It doesn't really sustain/grow jellyfish very well if at all in the long term. Can you try hatching some live artemia? We are going through the FDA process at the moment for our feed and we hope it will be ready soon.

If you can test your your water by some other method you will know if your swing hydrometer is calibrated. In my experience they tend to drift and can easily read 5ppt from the truth in a short time.
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Re: My jellyfish seem to be a little spaced out and derpy

Postby Santicity » 10 Feb 2014, 08:52

According to Jellyfishart's website:

The only jellyfish food providing complete nutrition for jellyfish! Made of several plankton ingredients up to 800 microns in size. This plankton is high in HUFAs (Highly Unsaturated Fatty Acids), which are essential for proper nutrition.

With Live artemia, do I have to hatch them everyday? My understanding is that they only last for a couple days? Is it possible that the jellies aren't getting enough nutrition?
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Re: My jellyfish seem to be a little spaced out and derpy

Postby Dr. T » 10 Feb 2014, 10:09

Yes you will need to hatch artemia everyday or at least every two days. You can keep/grow artemia but you will need to feed and change water everyday which is same hassle as hatching them everyday. You can grow your jellyfish from juvenile to 30cm by just feeding freshly hatched brine shrimp. Alternatively you can use Reef Nutrition ROE which is recommended by PBnJellies. I have never tried them but they said it works well.

I am not sure why your jellyfish is getting sucked as they get sucked only when they are not actively pulsing.
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Re: My jellyfish seem to be a little spaced out and derpy

Postby Santicity » 11 Feb 2014, 07:46

That is one of the problems, as it does not appear they are actively pulsing.

Also, what happens if I overfeed the jellies? I should be seeing a ring of food in their four stomachs right?
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Re: My jellyfish seem to be a little spaced out and derpy

Postby Cubic » 12 Feb 2014, 04:19

Yeah, you should see a bright orange ring of food around each of their stomachs every time you feed.

We did some long term trials with frozen copepods and jellyfish and found they just didn't sustain them long term. We did see growth for a short period (around a month) but then their health started to decline. I think it is more to do with the digestibility of the copepods than their nutritional value because their nutritional value is probably higher than that of artemia nauplii.
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Re: My jellyfish seem to be a little spaced out and derpy

Postby Cubic » 12 Feb 2014, 04:24

Forgot to mention, the only issue with over feeding the jellies is that it can effect your water quality. If you keep a close eye on your water quality you can feed quite a lot but jellyfish can grow very quickly!
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Re: My jellyfish seem to be a little spaced out and derpy

Postby Santicity » 13 Feb 2014, 07:26

I turned up the flow a little bit, and they seem to pulsing a tiny bit more, however with the increase flow I run into the other problem where when they reach the bottom, they just kept blown all the way to the other side. They also don't seem to get stuck to the wall anymore. I'm just wondering is there a "standard" level of flow?


Also I'm wondering if I'm just being crazy and my jellies are pulsing fine? The problem is that when they don't pulse they don't retain the "bell" shape and instead kind of fold up.

I'll look into hatching some live artemia though :)
Santicity
 
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