More jelly blobs on the beach

You’ve seen it — a blob of jelly goo glistening on the sand. Jelly on Beach by CM ParsonsIt’s probably not alive, drying in the sun, but you don’t want to touch it. You’re fairly sure it’s a jellyfish and you know jellyfish sting. You’re probably right.

My earlier post — Not all beach blobs are jellies — focused on Melibe, a gelatinous blob that’s not a jellyfish. It’s a non-stinging nudibranch (sea slug). In that post I neglected the real jellyfish blobs on our beaches. This post corrects that omission and shows the jellies (my preferred term for jellyfish) that I encountered as blobs on our beaches in June. Because the blobs don’t do these animals justice, I’ve included links to the lovely living animals, mostly in aquarium exhibits.

Sea Nettle beached by CM ParsonsThis brown blob is a sea nettle (Chrysaora fuscescens). This is the jelly that I see most when I kayak the bay. If you’ve been to the Monterey Bay Aquarium, you probably have pictures of these mesmerizing jellies. The sea nettle grows to 12 inches (30.5 cm) across with 15-foot (4.5-m) trailing tentacles. (By the time jellies hit the sand, tentacles are usually gone.) Sea nettles are stingers and so you don’t want to touch. The stinging cells (nematocysts) can fire even when the jelly is beached. This jelly uses its nematocysts to capture crustaceans, other jellies, fish eggs, fish larvae (baby fish) and other small drifting prey.

Aequorea jelly blob by CM ParsonsThis striated jelly blob was new to me and I’ve seen only a few. It’s a crystal jelly, or water jelly (Aequorea spp.). The crystal jelly along our coast grows to about 3 or 4 inches (8 to 10 cm). The striations you see are radial canals, which distribute nutrients from its meals — other soft-bodied animals, mostly jellies. Its sting tends to be mild to people. Researchers working with crystal jellies isolated its light-producing gene, which has led to major glowing-green-in-the-dark, or green fluorescent protein (GFP), research. The GFP work was awarded a Nobel Prize in Chemistry in 2008. Jellies do have value, not only in their environment and as entertainment, but also in helping us understand how life works.

I’m not sure which species this blob is — either a moon jelly (Aurelia sp.) or a purple-striped jelly (Chrysaora colorata), but it has too much purple for the former and not enough for the later (unless it’s a young one). Other distinguishing features aren’t obvious. Purple Jelly by CM ParsonsMoon jellies are a common sight when I kayak. The translucent bell contains whitish oral arms and stomach pouches (except when full of food) and purplish gonads. It can grow to 16 inches (40.5 cm), but the ones I see in the water are usually smaller than 12 inches (30.5 cm). Instead of the long tentacles typical of other jellies, the moon jelly has many fine ones on the bell’s edge and mucus is the weapon it uses to collect tiny zooplankton. These jellies are not powerful stingers, but might irritate your skin if handled. The purple-striped jelly, as the name implies, has purple stripes and some spots. It grows to about 32 inches (81 cm) across with tentacles more than 10 feet (3 m) long. This jelly can deliver a painful sting if handled, so hands off. Like the sea nettle, it eats a variety of zooplankton (drifting animals) such as fish eggs, larvae and other jellies.

Gooseberry blobs by CM ParsonsThese perfectly round little jelly blobs littered my local beach in early June and I couldn’t figure out what they were. At first I thought they were eggs of some kind. They were about the size of a dime. Most were clear; a few had a little something inside. I emailed local jelly expert, David Wrobel, who has a great website, The JelliesZone (my primary source for gelatinous bay life, although any errors in this post are mine, not his). Gooseberry blobs by CM ParsonsHe emailed back that these were most likely sea gooseberries (Pleurobrachia bachei). Although lovely as dots on the beach, the blobs are nothing like the live animals. A sea gooseberry  is a type of comb jelly — jellies with running lights. Trailing off the spherical body are two long tentacles with sticky cells (not stinging) for catching little fishes and other drifting prey. Each individual is both male and female (hermaphroditic) and prolific.

During my walks I see these species abandoned on the sand by tides and surf. I love the discoveries, but am saddened by the sights because I know how lovely they are in their watery realm. I hope this’ll give you a better appreciation for the beach blobs you may find on the beach this summer.

For a kayaking view of Monterey Bay jellies, visit my Bestiary.

Note: Don’t handle any sea creature unless you know what it is, what you’re doing and what the regulations are. If you’re stung by a jelly, call 911 and use this WebMD first aid link.

Note 2: After I posted this, rare black jellies were encountered by swimmers off Southern California beaches. Here’s the news with photos.

Note 3: For more jelly blobs on Monterey Bay beaches, see my posts Sea butterflies or Latest jelly mystery.

The Jellies Zone:
Aequorea spp., Crystal Jellies
 sp., Moon Jellies
Chrysaora colorataPurple-striped Jelly
Chrysaora fuscescensSea Nettle
Pleurobrachia bachei, Sea Gooseberry
Morris, R., Abbott, D. & Haderlie, E. (1980). Intertidal Invertebrates of California. Stanford, CA: Stanford University Press.
Sept, J. D. (2002). The Beachcomber’s Guide to Seashore Life of California. Madeira Park, BC Canada: Harbour Publishing.
Wrobel, D. & Mills, C. (1998). Pacific Coast Pelagic Invertebrates: A guide to the common gelatinous animals. Monterey, CA: Sea Challengers and Monterey Bay Aquarium.
Campbell, E. (1992). A Guide to the World of Jellyfish. Monterey, CA: Monterey Bay Aquarium.
George, T. C. (2000). Jellies: The life of jellyfish. Brookfield, CT: The Millbrook Press.
Jelly Biologist website
Niesen, T. M. (1994). Beachcomber’s Guide to California Marine Life. Houston: Gulf Publishing Company.
SAJellyWatch website

11 Comments on “More jelly blobs on the beach

    • Zaviya
      I don’t know. Our beaches have been closed (off and on) due to COVID-19 orders and I have not visited any recently. Even if the salps have be around, their arrival on local beaches is hard to predict.
      Thanks for asking.


      • just saw your comment (2020)- covid and beach ? absurd fresh air is the best for people , had flue and at home twice during 2019, 2022 – stay healthy stay outdoors ! no need for v

        Liked by 1 person

  1. Thanks for the info Chris. A friend and I were surfing this morning (in Durban South Africa) and the waters were filled with little clear/stinging (mild) blobs of jelly. I’ve experienced this a number of times in my 30 odd years of surfing our coast but decided to Google it this time (There were dolphins catching waves/jumping out the water too – maybe feeding? – life is sweet).


  2. I recently went to the beach (lower North Island in New Zealand) and saw a couple of jelly blobs that washed ashore. Unfortunately they were taken back into the water by the tide before I could take a picture. They were circular or oval-ish in shape and had what looked like a black spiral or spring in the middle of the blob. If you have any idea what they are please let me know. Couldn’t find the answer on google.


  3. Pingback: All Washed Up — on the Sand | Karen Gillmore Art

    • Hi Karen
      Thanks for including me in your post. I enjoyed reading your Vancouver trip write up and your photos. I have a similar shot of egg cases on the beach, and haven’t yet figured our what they are. I’ll let you know if I do. Like you, I love the treasures I find on the beach — and the mysteries often associated.


  4. A few years too late but I moved to Daytona Beach in 2015 and have been pulling in as much as 3 lbs in a 5 foot cast net and I believe it is plankton. No matter what it is it’s a living organism and believe it’s plankton literally banding together to create the larger balls. I lived in Corpus Christi years ago and eel would swim at night through plankton collecting it on their heads so you would see them glow!

    Here at night when I throw my cast net large balls of plankton suddenly emits a glow as the cast net hits the water then I pull it in only to have collected a couple of pounds of the slime. It will seep between the planks of the pier then disappear into the water. I’ve noticed it comes in twice a year so far. Heaviest has been Mid April and again in Late September.


    • Hi Kevin

      Wow. I love kayaking through bioluminescent waters. I don’t know Florida waters that well so I’m not exactly sure what you’re seeing. Your first description could be tiny, single-celled creatures called dinoflagellates, which bioluminesce (produce light via chemicals). When you disturb them, they respond by lighting up. However, your second description of balls of gel sounds more like comb jellies, which look like jellyfish, but aren’t. They make bioluminescence like the dinoflagellates, and also use rows of cilia (tiny paddles) that refract and reflect light, showing rainbow colors when they move. All of these are plankton (organisms drifting in the water).

      Whatever you’re seeing, it’s natural and amazing. Enjoy.


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