Do you have some jellyfish news or an idea to share? Contact me at firstname.lastname@example.org to find out more about contributing to the site…
And here I thought I was going to be able to contribute money to the cause… haha
I’ll let you know when we see any interesting species of jellies over here in the Gulf. (We had a bunch of lions mane jellies in our water last summer)
You sure they were lion’s manes and not Drymonema?
Here is 2 cents! 🙂
I can second what Matt was referring to were lions mane. Though, I had seen one lone Drymonema in the surf 2 years ago off of Siesta Key, FL.
Just wanted to introduce myself. I’m very impressed with your website. I’ve been working with jellies for over 15 years, actually the folks at Monterey trained me way back then when NEAq was just starting out our Jelly Room and Exhibits. I worked with Freya Sommer and Dave Robel for a couple of weeks back then, and they taught me and Steve Bailey everything they knew at the time about jelly culture and exhibitry.
Steve is our Curator now, and I teach High School full time, but work summers and weekends in our Jelly Rooms and Exhibits. Anywho, just wanted to compliment your site, and introduce myself!
David T. Winchester
Marine Biology and AP Environmental Science Teacher
Lynn Classical High School
Aquarist – Fishes Department
New England Aquarium
Marine Science Center
I have three large Moon Jellies. Two of the three are inverted, I have had them and they have been like this for over a month. They otherwise appear healthy. Any thoughts or comments?
Hi Stuart, sounds like your moons have grown big!? Yes, sometimes if there isn’t enough flow in the tank the jellies will get stuck on the sides and then start to invert. This can also be caused by fluctuating water quality, ie a rapid change in pH or temperature. There isn’t much you can do except gently revert them by pushing on them and letting them continue to grow.
Eric speaking…when it comes to jellies such as Cassiopea and their requirements for photosynthesis, corals have also been mentioned in the conversation. I’ve heard the term PAR (photosynthetically active radiation) value used a lot. What is a good PAR value for Cassiopea or any jelly with zooxanthellae? Would it vary depending on where the jellies came from geographically? I’ve seen home hobbyists use LED’s over their corals, but from experience I’ve only seen metal halides/plasma lighting for jellies. What is the difference in terms of PAR values?
LED’s don’t tend to put out a lot of PAR because they are only putting out a few wavelengths over a smaller area. They can definitely be used in smaller tanks but in large exhibits they don’t tend to work because it requires too many LED units and is not cost effective. Plasma gets the highest PAR/Watt because it is putting out the greatest diversity of wavelengths (PAR is the sum of energy measured across the 400-700nm usable spectrum) and is by far the most cost effective(cost of a plasma unit is now equal or less than a high end MH unit). Metal halides are pretty “old and sloppy”, 1950s technology, even with the newer electronic ballasts they waste a lot of energy via heat – however on the plus side there are a lot of bulb options for achieving any particular look you want. You may get higher PAR values in the same tank using MH vs plasma but that is usually because the MH is putting out a lot more energy in say, the blues, reds or greens… depends on the bulb. So having that nice natural spectrum from the plasmas is ideal for growing just about anything. There is also a higher output version of plasma coming out which will be equivalent to a 600-800W MH bulb, very bright and tons of PAR. We also use large LEDs to help balance out the plasmas sometimes.
As for wild PAR values, you would need to go measure in the field – there is some data out there but tropical coastal areas with Cassipoea are highly variable. ie Some live in mud flats with terrible light penetration and some live in crystal clear waters, the PAR could vary from as little as 400 to 2000+ umol. Either way, you want a ton of light so the jellies can rely on their own natural algae farming and not have to rely too much on brine shrimp. Cultured Cassiopea tend to be pretty dull vs their wild collected counterparts… lots of fun experimenting to do for someone out there… And just to give you an idea of how much PAR irradiates near the water, right now at 12:30pm in the fall, northern hemisphere at 36N there’s 1200 umol coming down – so now imagine how much more is coming down near the equator.
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